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</pre><pre class='rust '>
<span class='comment'>// Copyright 2013 The Rust Project Developers. See the COPYRIGHT</span>
<span class='comment'>// file at the top-level directory of this distribution and at</span>
<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>
<span class='doccomment'>//! The ISAAC random number generator.</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>allow</span>(<span class='ident'>non_camel_case_types</span>)]</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>slice</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>repeat</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>num</span>::<span class='ident'>Wrapping</span> <span class='kw'>as</span> <span class='ident'>w</span>;
<span class='kw'>use</span> {<span class='ident'>Rng</span>, <span class='ident'>SeedableRng</span>, <span class='ident'>Rand</span>, <span class='ident'>w32</span>, <span class='ident'>w64</span>};
<span class='kw'>const</span> <span class='ident'>RAND_SIZE_LEN</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>8</span>;
<span class='kw'>const</span> <span class='ident'>RAND_SIZE</span>: <span class='ident'>u32</span> <span class='op'>=</span> <span class='number'>1</span> <span class='op'><<</span> <span class='ident'>RAND_SIZE_LEN</span>;
<span class='kw'>const</span> <span class='ident'>RAND_SIZE_USIZE</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>1</span> <span class='op'><<</span> <span class='ident'>RAND_SIZE_LEN</span>;
<span class='doccomment'>/// A random number generator that uses the ISAAC algorithm[1].</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The ISAAC algorithm is generally accepted as suitable for</span>
<span class='doccomment'>/// cryptographic purposes, but this implementation has not be</span>
<span class='doccomment'>/// verified as such. Prefer a generator like `OsRng` that defers to</span>
<span class='doccomment'>/// the operating system for cases that need high security.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// [1]: Bob Jenkins, [*ISAAC: A fast cryptographic random number</span>
<span class='doccomment'>/// generator*](http://www.burtleburtle.net/bob/rand/isaacafa.html)</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>IsaacRng</span> {
<span class='ident'>cnt</span>: <span class='ident'>u32</span>,
<span class='ident'>rsl</span>: [<span class='ident'>w32</span>; <span class='ident'>RAND_SIZE_USIZE</span>],
<span class='ident'>mem</span>: [<span class='ident'>w32</span>; <span class='ident'>RAND_SIZE_USIZE</span>],
<span class='ident'>a</span>: <span class='ident'>w32</span>,
<span class='ident'>b</span>: <span class='ident'>w32</span>,
<span class='ident'>c</span>: <span class='ident'>w32</span>,
}
<span class='kw'>static</span> <span class='ident'>EMPTY</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>IsaacRng</span> {
<span class='ident'>cnt</span>: <span class='number'>0</span>,
<span class='ident'>rsl</span>: [<span class='ident'>w</span>(<span class='number'>0</span>); <span class='ident'>RAND_SIZE_USIZE</span>],
<span class='ident'>mem</span>: [<span class='ident'>w</span>(<span class='number'>0</span>); <span class='ident'>RAND_SIZE_USIZE</span>],
<span class='ident'>a</span>: <span class='ident'>w</span>(<span class='number'>0</span>), <span class='ident'>b</span>: <span class='ident'>w</span>(<span class='number'>0</span>), <span class='ident'>c</span>: <span class='ident'>w</span>(<span class='number'>0</span>),
};
<span class='kw'>impl</span> <span class='ident'>IsaacRng</span> {
<span class='doccomment'>/// Create an ISAAC random number generator using the default</span>
<span class='doccomment'>/// fixed seed.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new_unseeded</span>() <span class='op'>-></span> <span class='ident'>IsaacRng</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span> <span class='op'>=</span> <span class='ident'>EMPTY</span>;
<span class='ident'>rng</span>.<span class='ident'>init</span>(<span class='bool-val'>false</span>);
<span class='ident'>rng</span>
}
<span class='doccomment'>/// Initialises `self`. If `use_rsl` is true, then use the current value</span>
<span class='doccomment'>/// of `rsl` as a seed, otherwise construct one algorithmically (not</span>
<span class='doccomment'>/// randomly).</span>
<span class='kw'>fn</span> <span class='ident'>init</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>use_rsl</span>: <span class='ident'>bool</span>) {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0x9e3779b9</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>d</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>g</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>h</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>mix</span> {
() <span class='op'>=></span> {{
<span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>^</span>(<span class='ident'>b</span><span class='op'><<</span><span class='number'>11</span>); <span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>+</span><span class='ident'>a</span>; <span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>+</span><span class='ident'>c</span>;
<span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>^</span>(<span class='ident'>c</span><span class='op'>>></span><span class='number'>2</span>); <span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>+</span><span class='ident'>b</span>; <span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>+</span><span class='ident'>d</span>;
<span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>^</span>(<span class='ident'>d</span><span class='op'><<</span><span class='number'>8</span>); <span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>+</span><span class='ident'>c</span>; <span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>+</span><span class='ident'>e</span>;
<span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>^</span>(<span class='ident'>e</span><span class='op'>>></span><span class='number'>16</span>); <span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>+</span><span class='ident'>d</span>; <span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>+</span><span class='ident'>f</span>;
<span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>^</span>(<span class='ident'>f</span><span class='op'><<</span><span class='number'>10</span>); <span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>+</span><span class='ident'>e</span>; <span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>+</span><span class='ident'>g</span>;
<span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>^</span>(<span class='ident'>g</span><span class='op'>>></span><span class='number'>4</span>); <span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>+</span><span class='ident'>f</span>; <span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>+</span><span class='ident'>h</span>;
<span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>^</span>(<span class='ident'>h</span><span class='op'><<</span><span class='number'>8</span>); <span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>+</span><span class='ident'>g</span>; <span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>+</span><span class='ident'>a</span>;
<span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>^</span>(<span class='ident'>a</span><span class='op'>>></span><span class='number'>9</span>); <span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>+</span><span class='ident'>h</span>; <span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>+</span><span class='ident'>b</span>;
}}
}
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>4</span> {
<span class='macro'>mix</span><span class='macro'>!</span>();
}
<span class='kw'>if</span> <span class='ident'>use_rsl</span> {
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>memloop</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> (<span class='number'>0</span>..<span class='ident'>RAND_SIZE_USIZE</span><span class='op'>/</span><span class='number'>8</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>8</span>) {
<span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span> ]; <span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>];
<span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>2</span>]; <span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>3</span>];
<span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>4</span>]; <span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>5</span>];
<span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>6</span>]; <span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>7</span>];
<span class='macro'>mix</span><span class='macro'>!</span>();
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span> ]<span class='op'>=</span><span class='ident'>a</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>]<span class='op'>=</span><span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>2</span>]<span class='op'>=</span><span class='ident'>c</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>3</span>]<span class='op'>=</span><span class='ident'>d</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>4</span>]<span class='op'>=</span><span class='ident'>e</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>5</span>]<span class='op'>=</span><span class='ident'>f</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>6</span>]<span class='op'>=</span><span class='ident'>g</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>7</span>]<span class='op'>=</span><span class='ident'>h</span>;
}
}}
}
<span class='macro'>memloop</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>rsl</span>);
<span class='macro'>memloop</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>mem</span>);
} <span class='kw'>else</span> {
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> (<span class='number'>0</span>..<span class='ident'>RAND_SIZE_USIZE</span><span class='op'>/</span><span class='number'>8</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>8</span>) {
<span class='macro'>mix</span><span class='macro'>!</span>();
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span> ]<span class='op'>=</span><span class='ident'>a</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>]<span class='op'>=</span><span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>2</span>]<span class='op'>=</span><span class='ident'>c</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>3</span>]<span class='op'>=</span><span class='ident'>d</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>4</span>]<span class='op'>=</span><span class='ident'>e</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>5</span>]<span class='op'>=</span><span class='ident'>f</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>6</span>]<span class='op'>=</span><span class='ident'>g</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>7</span>]<span class='op'>=</span><span class='ident'>h</span>;
}
}
<span class='self'>self</span>.<span class='ident'>isaac</span>();
}
<span class='doccomment'>/// Refills the output buffer (`self.rsl`)</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>isaac</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
<span class='self'>self</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>c</span> <span class='op'>+</span> <span class='ident'>w</span>(<span class='number'>1</span>);
<span class='comment'>// abbreviations</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>b</span> <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>c</span>;
<span class='kw'>const</span> <span class='ident'>MIDPOINT</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='ident'>RAND_SIZE_USIZE</span> <span class='op'>/</span> <span class='number'>2</span>;
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>ind</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>x</span>:<span class='ident'>expr</span>) <span class='op'>=></span> ( <span class='self'>self</span>.<span class='ident'>mem</span>[(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>x</span> <span class='op'>>></span> <span class='number'>2usize</span>).<span class='number'>0</span> <span class='kw'>as</span> <span class='ident'>usize</span> <span class='op'>&</span> (<span class='ident'>RAND_SIZE_USIZE</span> <span class='op'>-</span> <span class='number'>1</span>)] )
}
<span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span> [(<span class='number'>0</span>, <span class='ident'>MIDPOINT</span>), (<span class='ident'>MIDPOINT</span>, <span class='number'>0</span>)];
<span class='kw'>for</span> <span class='kw-2'>&</span>(<span class='ident'>mr_offset</span>, <span class='ident'>m2_offset</span>) <span class='kw'>in</span> <span class='ident'>r</span>.<span class='ident'>iter</span>() {
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>rngstepp</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>base</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>;
<span class='kw'>let</span> <span class='ident'>mix</span> <span class='op'>=</span> <span class='ident'>a</span> <span class='op'><<</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>;
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>];
<span class='ident'>a</span> <span class='op'>=</span> (<span class='ident'>a</span> <span class='op'>^</span> <span class='ident'>mix</span>) <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>m2_offset</span>];
<span class='kw'>let</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>x</span>) <span class='op'>+</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>] <span class='op'>=</span> <span class='ident'>y</span>;
<span class='ident'>b</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>y</span> <span class='op'>>></span> <span class='ident'>RAND_SIZE_LEN</span>) <span class='op'>+</span> <span class='ident'>x</span>;
<span class='self'>self</span>.<span class='ident'>rsl</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>] <span class='op'>=</span> <span class='ident'>b</span>;
}}
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>rngstepn</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>base</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>;
<span class='kw'>let</span> <span class='ident'>mix</span> <span class='op'>=</span> <span class='ident'>a</span> <span class='op'>>></span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>;
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>];
<span class='ident'>a</span> <span class='op'>=</span> (<span class='ident'>a</span> <span class='op'>^</span> <span class='ident'>mix</span>) <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>m2_offset</span>];
<span class='kw'>let</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>x</span>) <span class='op'>+</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>] <span class='op'>=</span> <span class='ident'>y</span>;
<span class='ident'>b</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>y</span> <span class='op'>>></span> <span class='ident'>RAND_SIZE_LEN</span>) <span class='op'>+</span> <span class='ident'>x</span>;
<span class='self'>self</span>.<span class='ident'>rsl</span>[<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>] <span class='op'>=</span> <span class='ident'>b</span>;
}}
}
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> (<span class='number'>0</span>..<span class='ident'>MIDPOINT</span><span class='op'>/</span><span class='number'>4</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>4</span>) {
<span class='macro'>rngstepp</span><span class='macro'>!</span>(<span class='ident'>i</span> <span class='op'>+</span> <span class='number'>0</span>, <span class='number'>13</span>);
<span class='macro'>rngstepn</span><span class='macro'>!</span>(<span class='ident'>i</span> <span class='op'>+</span> <span class='number'>1</span>, <span class='number'>6</span>);
<span class='macro'>rngstepp</span><span class='macro'>!</span>(<span class='ident'>i</span> <span class='op'>+</span> <span class='number'>2</span>, <span class='number'>2</span>);
<span class='macro'>rngstepn</span><span class='macro'>!</span>(<span class='ident'>i</span> <span class='op'>+</span> <span class='number'>3</span>, <span class='number'>16</span>);
}
}
<span class='self'>self</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='self'>self</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='ident'>RAND_SIZE</span>;
}
}
<span class='comment'>// Cannot be derived because [u32; 256] does not implement Clone</span>
<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>IsaacRng</span> {
<span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>IsaacRng</span> {
<span class='kw-2'>*</span><span class='self'>self</span>
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>IsaacRng</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='comment'>// make some more numbers</span>
<span class='self'>self</span>.<span class='ident'>isaac</span>();
}
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>-=</span> <span class='number'>1</span>;
<span class='comment'>// self.cnt is at most RAND_SIZE, but that is before the</span>
<span class='comment'>// subtraction above. We want to index without bounds</span>
<span class='comment'>// checking, but this could lead to incorrect code if someone</span>
<span class='comment'>// misrefactors, so we check, sometimes.</span>
<span class='comment'>//</span>
<span class='comment'>// (Changes here should be reflected in Isaac64Rng.next_u64.)</span>
<span class='macro'>debug_assert</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'><</span> <span class='ident'>RAND_SIZE</span>);
<span class='comment'>// (the % is cheaply telling the optimiser that we're always</span>
<span class='comment'>// in bounds, without unsafe. NB. this is a power of two, so</span>
<span class='comment'>// it optimises to a bitwise mask).</span>
<span class='self'>self</span>.<span class='ident'>rsl</span>[(<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>%</span> <span class='ident'>RAND_SIZE</span>) <span class='kw'>as</span> <span class='ident'>usize</span>].<span class='number'>0</span>
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>SeedableRng</span><span class='op'><</span><span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u32</span>]<span class='op'>></span> <span class='kw'>for</span> <span class='ident'>IsaacRng</span> {
<span class='kw'>fn</span> <span class='ident'>reseed</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u32</span>]) {
<span class='comment'>// make the seed into [seed[0], seed[1], ..., seed[seed.len()</span>
<span class='comment'>// - 1], 0, 0, ...], to fill rng.rsl.</span>
<span class='kw'>let</span> <span class='ident'>seed_iter</span> <span class='op'>=</span> <span class='ident'>seed</span>.<span class='ident'>iter</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>).<span class='ident'>chain</span>(<span class='ident'>repeat</span>(<span class='number'>0u32</span>));
<span class='kw'>for</span> (<span class='ident'>rsl_elem</span>, <span class='ident'>seed_elem</span>) <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>rsl</span>.<span class='ident'>iter_mut</span>().<span class='ident'>zip</span>(<span class='ident'>seed_iter</span>) {
<span class='kw-2'>*</span><span class='ident'>rsl_elem</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='ident'>seed_elem</span>);
}
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='self'>self</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='self'>self</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='self'>self</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='self'>self</span>.<span class='ident'>init</span>(<span class='bool-val'>true</span>);
}
<span class='doccomment'>/// Create an ISAAC random number generator with a seed. This can</span>
<span class='doccomment'>/// be any length, although the maximum number of elements used is</span>
<span class='doccomment'>/// 256 and any more will be silently ignored. A generator</span>
<span class='doccomment'>/// constructed with a given seed will generate the same sequence</span>
<span class='doccomment'>/// of values as all other generators constructed with that seed.</span>
<span class='kw'>fn</span> <span class='ident'>from_seed</span>(<span class='ident'>seed</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u32</span>]) <span class='op'>-></span> <span class='ident'>IsaacRng</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span> <span class='op'>=</span> <span class='ident'>EMPTY</span>;
<span class='ident'>rng</span>.<span class='ident'>reseed</span>(<span class='ident'>seed</span>);
<span class='ident'>rng</span>
}
}
<span class='kw'>impl</span> <span class='ident'>Rand</span> <span class='kw'>for</span> <span class='ident'>IsaacRng</span> {
<span class='kw'>fn</span> <span class='ident'>rand</span><span class='op'><</span><span class='ident'>R</span>: <span class='ident'>Rng</span><span class='op'>></span>(<span class='ident'>other</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>R</span>) <span class='op'>-></span> <span class='ident'>IsaacRng</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='ident'>EMPTY</span>;
<span class='kw'>unsafe</span> {
<span class='kw'>let</span> <span class='ident'>ptr</span> <span class='op'>=</span> <span class='ident'>ret</span>.<span class='ident'>rsl</span>.<span class='ident'>as_mut_ptr</span>() <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>u8</span>;
<span class='kw'>let</span> <span class='ident'>slice</span> <span class='op'>=</span> <span class='ident'>slice</span>::<span class='ident'>from_raw_parts_mut</span>(<span class='ident'>ptr</span>, <span class='ident'>RAND_SIZE_USIZE</span> <span class='op'>*</span> <span class='number'>4</span>);
<span class='ident'>other</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>slice</span>);
}
<span class='ident'>ret</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='ident'>ret</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='ident'>ret</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='ident'>ret</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='ident'>ret</span>.<span class='ident'>init</span>(<span class='bool-val'>true</span>);
<span class='kw'>return</span> <span class='ident'>ret</span>;
}
}
<span class='kw'>const</span> <span class='ident'>RAND_SIZE_64_LEN</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>8</span>;
<span class='kw'>const</span> <span class='ident'>RAND_SIZE_64</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>1</span> <span class='op'><<</span> <span class='ident'>RAND_SIZE_64_LEN</span>;
<span class='doccomment'>/// A random number generator that uses ISAAC-64[1], the 64-bit</span>
<span class='doccomment'>/// variant of the ISAAC algorithm.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The ISAAC algorithm is generally accepted as suitable for</span>
<span class='doccomment'>/// cryptographic purposes, but this implementation has not be</span>
<span class='doccomment'>/// verified as such. Prefer a generator like `OsRng` that defers to</span>
<span class='doccomment'>/// the operating system for cases that need high security.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// [1]: Bob Jenkins, [*ISAAC: A fast cryptographic random number</span>
<span class='doccomment'>/// generator*](http://www.burtleburtle.net/bob/rand/isaacafa.html)</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Isaac64Rng</span> {
<span class='ident'>cnt</span>: <span class='ident'>usize</span>,
<span class='ident'>rsl</span>: [<span class='ident'>w64</span>; <span class='ident'>RAND_SIZE_64</span>],
<span class='ident'>mem</span>: [<span class='ident'>w64</span>; <span class='ident'>RAND_SIZE_64</span>],
<span class='ident'>a</span>: <span class='ident'>w64</span>,
<span class='ident'>b</span>: <span class='ident'>w64</span>,
<span class='ident'>c</span>: <span class='ident'>w64</span>,
}
<span class='kw'>static</span> <span class='ident'>EMPTY_64</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>Isaac64Rng</span> {
<span class='ident'>cnt</span>: <span class='number'>0</span>,
<span class='ident'>rsl</span>: [<span class='ident'>w</span>(<span class='number'>0</span>); <span class='ident'>RAND_SIZE_64</span>],
<span class='ident'>mem</span>: [<span class='ident'>w</span>(<span class='number'>0</span>); <span class='ident'>RAND_SIZE_64</span>],
<span class='ident'>a</span>: <span class='ident'>w</span>(<span class='number'>0</span>), <span class='ident'>b</span>: <span class='ident'>w</span>(<span class='number'>0</span>), <span class='ident'>c</span>: <span class='ident'>w</span>(<span class='number'>0</span>),
};
<span class='kw'>impl</span> <span class='ident'>Isaac64Rng</span> {
<span class='doccomment'>/// Create a 64-bit ISAAC random number generator using the</span>
<span class='doccomment'>/// default fixed seed.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new_unseeded</span>() <span class='op'>-></span> <span class='ident'>Isaac64Rng</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span> <span class='op'>=</span> <span class='ident'>EMPTY_64</span>;
<span class='ident'>rng</span>.<span class='ident'>init</span>(<span class='bool-val'>false</span>);
<span class='ident'>rng</span>
}
<span class='doccomment'>/// Initialises `self`. If `use_rsl` is true, then use the current value</span>
<span class='doccomment'>/// of `rsl` as a seed, otherwise construct one algorithmically (not</span>
<span class='doccomment'>/// randomly).</span>
<span class='kw'>fn</span> <span class='ident'>init</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>use_rsl</span>: <span class='ident'>bool</span>) {
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>init</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span>:<span class='ident'>ident</span>) <span class='op'>=></span> (
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>var</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0x9e3779b97f4a7c13</span>);
)
}
<span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>a</span>); <span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>b</span>); <span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>c</span>); <span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>d</span>);
<span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>e</span>); <span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>f</span>); <span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>g</span>); <span class='macro'>init</span><span class='macro'>!</span>(<span class='ident'>h</span>);
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>mix</span> {
() <span class='op'>=></span> {{
<span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>-</span><span class='ident'>e</span>; <span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>^</span>(<span class='ident'>h</span><span class='op'>>></span><span class='number'>9</span>); <span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>+</span><span class='ident'>a</span>;
<span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>-</span><span class='ident'>f</span>; <span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>^</span>(<span class='ident'>a</span><span class='op'><<</span><span class='number'>9</span>); <span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>+</span><span class='ident'>b</span>;
<span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>-</span><span class='ident'>g</span>; <span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>^</span>(<span class='ident'>b</span><span class='op'>>></span><span class='number'>23</span>); <span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>+</span><span class='ident'>c</span>;
<span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>-</span><span class='ident'>h</span>; <span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>^</span>(<span class='ident'>c</span><span class='op'><<</span><span class='number'>15</span>); <span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>+</span><span class='ident'>d</span>;
<span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>-</span><span class='ident'>a</span>; <span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>^</span>(<span class='ident'>d</span><span class='op'>>></span><span class='number'>14</span>); <span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>+</span><span class='ident'>e</span>;
<span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>-</span><span class='ident'>b</span>; <span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>^</span>(<span class='ident'>e</span><span class='op'><<</span><span class='number'>20</span>); <span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>+</span><span class='ident'>f</span>;
<span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>-</span><span class='ident'>c</span>; <span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>^</span>(<span class='ident'>f</span><span class='op'>>></span><span class='number'>17</span>); <span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>+</span><span class='ident'>g</span>;
<span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>-</span><span class='ident'>d</span>; <span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>^</span>(<span class='ident'>g</span><span class='op'><<</span><span class='number'>14</span>); <span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>+</span><span class='ident'>h</span>;
}}
}
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>4</span> {
<span class='macro'>mix</span><span class='macro'>!</span>();
}
<span class='kw'>if</span> <span class='ident'>use_rsl</span> {
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>memloop</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> (<span class='number'>0</span>..<span class='ident'>RAND_SIZE_64</span> <span class='op'>/</span> <span class='number'>8</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>8</span>) {
<span class='ident'>a</span><span class='op'>=</span><span class='ident'>a</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span> ]; <span class='ident'>b</span><span class='op'>=</span><span class='ident'>b</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>];
<span class='ident'>c</span><span class='op'>=</span><span class='ident'>c</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>2</span>]; <span class='ident'>d</span><span class='op'>=</span><span class='ident'>d</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>3</span>];
<span class='ident'>e</span><span class='op'>=</span><span class='ident'>e</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>4</span>]; <span class='ident'>f</span><span class='op'>=</span><span class='ident'>f</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>5</span>];
<span class='ident'>g</span><span class='op'>=</span><span class='ident'>g</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>6</span>]; <span class='ident'>h</span><span class='op'>=</span><span class='ident'>h</span><span class='op'>+</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arr</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>7</span>];
<span class='macro'>mix</span><span class='macro'>!</span>();
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span> ]<span class='op'>=</span><span class='ident'>a</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>]<span class='op'>=</span><span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>2</span>]<span class='op'>=</span><span class='ident'>c</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>3</span>]<span class='op'>=</span><span class='ident'>d</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>4</span>]<span class='op'>=</span><span class='ident'>e</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>5</span>]<span class='op'>=</span><span class='ident'>f</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>6</span>]<span class='op'>=</span><span class='ident'>g</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>7</span>]<span class='op'>=</span><span class='ident'>h</span>;
}
}}
}
<span class='macro'>memloop</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>rsl</span>);
<span class='macro'>memloop</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>mem</span>);
} <span class='kw'>else</span> {
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> (<span class='number'>0</span>..<span class='ident'>RAND_SIZE_64</span> <span class='op'>/</span> <span class='number'>8</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>8</span>) {
<span class='macro'>mix</span><span class='macro'>!</span>();
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span> ]<span class='op'>=</span><span class='ident'>a</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>1</span>]<span class='op'>=</span><span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>2</span>]<span class='op'>=</span><span class='ident'>c</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>3</span>]<span class='op'>=</span><span class='ident'>d</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>4</span>]<span class='op'>=</span><span class='ident'>e</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>5</span>]<span class='op'>=</span><span class='ident'>f</span>;
<span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>6</span>]<span class='op'>=</span><span class='ident'>g</span>; <span class='self'>self</span>.<span class='ident'>mem</span>[<span class='ident'>i</span><span class='op'>+</span><span class='number'>7</span>]<span class='op'>=</span><span class='ident'>h</span>;
}
}
<span class='self'>self</span>.<span class='ident'>isaac64</span>();
}
<span class='doccomment'>/// Refills the output buffer (`self.rsl`)</span>
<span class='kw'>fn</span> <span class='ident'>isaac64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
<span class='self'>self</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>c</span> <span class='op'>+</span> <span class='ident'>w</span>(<span class='number'>1</span>);
<span class='comment'>// abbreviations</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>a</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>b</span> <span class='op'>+</span> <span class='self'>self</span>.<span class='ident'>c</span>;
<span class='kw'>const</span> <span class='ident'>MIDPOINT</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='ident'>RAND_SIZE_64</span> <span class='op'>/</span> <span class='number'>2</span>;
<span class='kw'>const</span> <span class='ident'>MP_VEC</span>: [(<span class='ident'>usize</span>, <span class='ident'>usize</span>); <span class='number'>2</span>] <span class='op'>=</span> [(<span class='number'>0</span>,<span class='ident'>MIDPOINT</span>), (<span class='ident'>MIDPOINT</span>, <span class='number'>0</span>)];
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>ind</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>x</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {
<span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>mem</span>.<span class='ident'>get_unchecked</span>(((<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>x</span> <span class='op'>>></span> <span class='number'>3usize</span>).<span class='number'>0</span> <span class='kw'>as</span> <span class='ident'>usize</span>) <span class='op'>&</span> (<span class='ident'>RAND_SIZE_64</span> <span class='op'>-</span> <span class='number'>1</span>))
}
}
<span class='kw'>for</span> <span class='kw-2'>&</span>(<span class='ident'>mr_offset</span>, <span class='ident'>m2_offset</span>) <span class='kw'>in</span> <span class='ident'>MP_VEC</span>.<span class='ident'>iter</span>() {
<span class='kw'>for</span> <span class='ident'>base</span> <span class='kw'>in</span> (<span class='number'>0</span>..<span class='ident'>MIDPOINT</span> <span class='op'>/</span> <span class='number'>4</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>4</span>) {
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>rngstepp</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>base</span> <span class='op'>=</span> <span class='ident'>base</span> <span class='op'>+</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>;
<span class='kw'>let</span> <span class='ident'>mix</span> <span class='op'>=</span> <span class='ident'>a</span> <span class='op'>^</span> (<span class='ident'>a</span> <span class='op'><<</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>);
<span class='kw'>let</span> <span class='ident'>mix</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span> <span class='op'>==</span> <span class='number'>0</span> {<span class='op'>!</span><span class='ident'>mix</span>} <span class='kw'>else</span> {<span class='ident'>mix</span>};
<span class='kw'>unsafe</span> {
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>mem</span>.<span class='ident'>get_unchecked</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>);
<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>mix</span> <span class='op'>+</span> <span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>mem</span>.<span class='ident'>get_unchecked</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>m2_offset</span>);
<span class='kw'>let</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>x</span>) <span class='op'>+</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>;
<span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>mem</span>.<span class='ident'>get_unchecked_mut</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>) <span class='op'>=</span> <span class='ident'>y</span>;
<span class='ident'>b</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>y</span> <span class='op'>>></span> <span class='ident'>RAND_SIZE_64_LEN</span>) <span class='op'>+</span> <span class='ident'>x</span>;
<span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>rsl</span>.<span class='ident'>get_unchecked_mut</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>) <span class='op'>=</span> <span class='ident'>b</span>;
}
}}
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>rngstepn</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>:<span class='ident'>expr</span>) <span class='op'>=></span> {{
<span class='kw'>let</span> <span class='ident'>base</span> <span class='op'>=</span> <span class='ident'>base</span> <span class='op'>+</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span>;
<span class='kw'>let</span> <span class='ident'>mix</span> <span class='op'>=</span> <span class='ident'>a</span> <span class='op'>^</span> (<span class='ident'>a</span> <span class='op'>>></span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>shift</span>);
<span class='kw'>let</span> <span class='ident'>mix</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>j</span> <span class='op'>==</span> <span class='number'>0</span> {<span class='op'>!</span><span class='ident'>mix</span>} <span class='kw'>else</span> {<span class='ident'>mix</span>};
<span class='kw'>unsafe</span> {
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>mem</span>.<span class='ident'>get_unchecked</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>);
<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>mix</span> <span class='op'>+</span> <span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>mem</span>.<span class='ident'>get_unchecked</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>m2_offset</span>);
<span class='kw'>let</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>x</span>) <span class='op'>+</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>;
<span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>mem</span>.<span class='ident'>get_unchecked_mut</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>) <span class='op'>=</span> <span class='ident'>y</span>;
<span class='ident'>b</span> <span class='op'>=</span> <span class='macro'>ind</span><span class='macro'>!</span>(<span class='ident'>y</span> <span class='op'>>></span> <span class='ident'>RAND_SIZE_64_LEN</span>) <span class='op'>+</span> <span class='ident'>x</span>;
<span class='kw-2'>*</span><span class='self'>self</span>.<span class='ident'>rsl</span>.<span class='ident'>get_unchecked_mut</span>(<span class='ident'>base</span> <span class='op'>+</span> <span class='ident'>mr_offset</span>) <span class='op'>=</span> <span class='ident'>b</span>;
}
}}
}
<span class='macro'>rngstepp</span><span class='macro'>!</span>(<span class='number'>0</span>, <span class='number'>21</span>);
<span class='macro'>rngstepn</span><span class='macro'>!</span>(<span class='number'>1</span>, <span class='number'>5</span>);
<span class='macro'>rngstepp</span><span class='macro'>!</span>(<span class='number'>2</span>, <span class='number'>12</span>);
<span class='macro'>rngstepn</span><span class='macro'>!</span>(<span class='number'>3</span>, <span class='number'>33</span>);
}
}
<span class='self'>self</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>a</span>;
<span class='self'>self</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>b</span>;
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='ident'>RAND_SIZE_64</span>;
}
}
<span class='comment'>// Cannot be derived because [u32; 256] does not implement Clone</span>
<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>Isaac64Rng</span> {
<span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Isaac64Rng</span> {
<span class='kw-2'>*</span><span class='self'>self</span>
}
}
<span class='kw'>impl</span> <span class='ident'>Rng</span> <span class='kw'>for</span> <span class='ident'>Isaac64Rng</span> {
<span class='comment'>// FIXME #7771: having next_u32 like this should be unnecessary</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>next_u32</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='self'>self</span>.<span class='ident'>next_u64</span>() <span class='kw'>as</span> <span class='ident'>u32</span>
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>next_u64</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u64</span> {
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>==</span> <span class='number'>0</span> {
<span class='comment'>// make some more numbers</span>
<span class='self'>self</span>.<span class='ident'>isaac64</span>();
}
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>-=</span> <span class='number'>1</span>;
<span class='comment'>// See corresponding location in IsaacRng.next_u32 for</span>
<span class='comment'>// explanation.</span>
<span class='macro'>debug_assert</span><span class='macro'>!</span>(<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'><</span> <span class='ident'>RAND_SIZE_64</span>);
<span class='self'>self</span>.<span class='ident'>rsl</span>[(<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>%</span> <span class='ident'>RAND_SIZE_64</span>) <span class='kw'>as</span> <span class='ident'>usize</span>].<span class='number'>0</span>
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>SeedableRng</span><span class='op'><</span><span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u64</span>]<span class='op'>></span> <span class='kw'>for</span> <span class='ident'>Isaac64Rng</span> {
<span class='kw'>fn</span> <span class='ident'>reseed</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>seed</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u64</span>]) {
<span class='comment'>// make the seed into [seed[0], seed[1], ..., seed[seed.len()</span>
<span class='comment'>// - 1], 0, 0, ...], to fill rng.rsl.</span>
<span class='kw'>let</span> <span class='ident'>seed_iter</span> <span class='op'>=</span> <span class='ident'>seed</span>.<span class='ident'>iter</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>).<span class='ident'>chain</span>(<span class='ident'>repeat</span>(<span class='number'>0u64</span>));
<span class='kw'>for</span> (<span class='ident'>rsl_elem</span>, <span class='ident'>seed_elem</span>) <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>rsl</span>.<span class='ident'>iter_mut</span>().<span class='ident'>zip</span>(<span class='ident'>seed_iter</span>) {
<span class='kw-2'>*</span><span class='ident'>rsl_elem</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='ident'>seed_elem</span>);
}
<span class='self'>self</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='self'>self</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='self'>self</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='self'>self</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='self'>self</span>.<span class='ident'>init</span>(<span class='bool-val'>true</span>);
}
<span class='doccomment'>/// Create an ISAAC random number generator with a seed. This can</span>
<span class='doccomment'>/// be any length, although the maximum number of elements used is</span>
<span class='doccomment'>/// 256 and any more will be silently ignored. A generator</span>
<span class='doccomment'>/// constructed with a given seed will generate the same sequence</span>
<span class='doccomment'>/// of values as all other generators constructed with that seed.</span>
<span class='kw'>fn</span> <span class='ident'>from_seed</span>(<span class='ident'>seed</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>u64</span>]) <span class='op'>-></span> <span class='ident'>Isaac64Rng</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span> <span class='op'>=</span> <span class='ident'>EMPTY_64</span>;
<span class='ident'>rng</span>.<span class='ident'>reseed</span>(<span class='ident'>seed</span>);
<span class='ident'>rng</span>
}
}
<span class='kw'>impl</span> <span class='ident'>Rand</span> <span class='kw'>for</span> <span class='ident'>Isaac64Rng</span> {
<span class='kw'>fn</span> <span class='ident'>rand</span><span class='op'><</span><span class='ident'>R</span>: <span class='ident'>Rng</span><span class='op'>></span>(<span class='ident'>other</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>R</span>) <span class='op'>-></span> <span class='ident'>Isaac64Rng</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='ident'>EMPTY_64</span>;
<span class='kw'>unsafe</span> {
<span class='kw'>let</span> <span class='ident'>ptr</span> <span class='op'>=</span> <span class='ident'>ret</span>.<span class='ident'>rsl</span>.<span class='ident'>as_mut_ptr</span>() <span class='kw'>as</span> <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>u8</span>;
<span class='kw'>let</span> <span class='ident'>slice</span> <span class='op'>=</span> <span class='ident'>slice</span>::<span class='ident'>from_raw_parts_mut</span>(<span class='ident'>ptr</span>, <span class='ident'>RAND_SIZE_64</span> <span class='op'>*</span> <span class='number'>8</span>);
<span class='ident'>other</span>.<span class='ident'>fill_bytes</span>(<span class='ident'>slice</span>);
}
<span class='ident'>ret</span>.<span class='ident'>cnt</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='ident'>ret</span>.<span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='ident'>ret</span>.<span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='ident'>ret</span>.<span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>w</span>(<span class='number'>0</span>);
<span class='ident'>ret</span>.<span class='ident'>init</span>(<span class='bool-val'>true</span>);
<span class='kw'>return</span> <span class='ident'>ret</span>;
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>test</span> {
<span class='kw'>use</span> {<span class='ident'>Rng</span>, <span class='ident'>SeedableRng</span>};
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>IsaacRng</span>, <span class='ident'>Isaac64Rng</span>};
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_32_rand_seeded</span>() {
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> ::<span class='ident'>test</span>::<span class='ident'>rng</span>().<span class='ident'>gen_iter</span>::<span class='op'><</span><span class='ident'>u32</span><span class='op'>></span>().<span class='ident'>take</span>(<span class='number'>256</span>).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u32</span><span class='op'>>></span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ra</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rb</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='macro'>assert</span><span class='macro'>!</span>(::<span class='ident'>test</span>::<span class='ident'>iter_eq</span>(<span class='ident'>ra</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>),
<span class='ident'>rb</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>)));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_64_rand_seeded</span>() {
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> ::<span class='ident'>test</span>::<span class='ident'>rng</span>().<span class='ident'>gen_iter</span>::<span class='op'><</span><span class='ident'>u64</span><span class='op'>></span>().<span class='ident'>take</span>(<span class='number'>256</span>).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u64</span><span class='op'>>></span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ra</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rb</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='macro'>assert</span><span class='macro'>!</span>(::<span class='ident'>test</span>::<span class='ident'>iter_eq</span>(<span class='ident'>ra</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>),
<span class='ident'>rb</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>)));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_32_seeded</span>() {
<span class='kw'>let</span> <span class='ident'>seed</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='number'>1</span>, <span class='number'>23</span>, <span class='number'>456</span>, <span class='number'>7890</span>, <span class='number'>12345</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ra</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rb</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(::<span class='ident'>test</span>::<span class='ident'>iter_eq</span>(<span class='ident'>ra</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>),
<span class='ident'>rb</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>)));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_64_seeded</span>() {
<span class='kw'>let</span> <span class='ident'>seed</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='number'>1</span>, <span class='number'>23</span>, <span class='number'>456</span>, <span class='number'>7890</span>, <span class='number'>12345</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ra</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rb</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(::<span class='ident'>test</span>::<span class='ident'>iter_eq</span>(<span class='ident'>ra</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>),
<span class='ident'>rb</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>)));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_32_reseed</span>() {
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> ::<span class='ident'>test</span>::<span class='ident'>rng</span>().<span class='ident'>gen_iter</span>::<span class='op'><</span><span class='ident'>u32</span><span class='op'>></span>().<span class='ident'>take</span>(<span class='number'>256</span>).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u32</span><span class='op'>>></span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>r</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='kw'>let</span> <span class='ident'>string1</span>: <span class='ident'>String</span> <span class='op'>=</span> <span class='ident'>r</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>).<span class='ident'>collect</span>();
<span class='ident'>r</span>.<span class='ident'>reseed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='kw'>let</span> <span class='ident'>string2</span>: <span class='ident'>String</span> <span class='op'>=</span> <span class='ident'>r</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>).<span class='ident'>collect</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>string1</span>, <span class='ident'>string2</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_64_reseed</span>() {
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> ::<span class='ident'>test</span>::<span class='ident'>rng</span>().<span class='ident'>gen_iter</span>::<span class='op'><</span><span class='ident'>u64</span><span class='op'>></span>().<span class='ident'>take</span>(<span class='number'>256</span>).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u64</span><span class='op'>>></span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>r</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='kw'>let</span> <span class='ident'>string1</span>: <span class='ident'>String</span> <span class='op'>=</span> <span class='ident'>r</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>).<span class='ident'>collect</span>();
<span class='ident'>r</span>.<span class='ident'>reseed</span>(<span class='kw-2'>&</span><span class='ident'>s</span>[..]);
<span class='kw'>let</span> <span class='ident'>string2</span>: <span class='ident'>String</span> <span class='op'>=</span> <span class='ident'>r</span>.<span class='ident'>gen_ascii_chars</span>().<span class='ident'>take</span>(<span class='number'>100</span>).<span class='ident'>collect</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>string1</span>, <span class='ident'>string2</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_32_true_values</span>() {
<span class='kw'>let</span> <span class='ident'>seed</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='number'>1</span>, <span class='number'>23</span>, <span class='number'>456</span>, <span class='number'>7890</span>, <span class='number'>12345</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ra</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='comment'>// Regression test that isaac is actually using the above vector</span>
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>ra</span>.<span class='ident'>next_u32</span>()).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>>></span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>,
<span class='macro'>vec</span><span class='macro'>!</span>(<span class='number'>2558573138</span>, <span class='number'>873787463</span>, <span class='number'>263499565</span>, <span class='number'>2103644246</span>, <span class='number'>3595684709</span>,
<span class='number'>4203127393</span>, <span class='number'>264982119</span>, <span class='number'>2765226902</span>, <span class='number'>2737944514</span>, <span class='number'>3900253796</span>));
<span class='kw'>let</span> <span class='ident'>seed</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='number'>12345</span>, <span class='number'>67890</span>, <span class='number'>54321</span>, <span class='number'>9876</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rb</span>: <span class='ident'>IsaacRng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='comment'>// skip forward to the 10000th number</span>
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>10000</span> { <span class='ident'>rb</span>.<span class='ident'>next_u32</span>(); }
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>rb</span>.<span class='ident'>next_u32</span>()).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>>></span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>,
<span class='macro'>vec</span><span class='macro'>!</span>(<span class='number'>3676831399</span>, <span class='number'>3183332890</span>, <span class='number'>2834741178</span>, <span class='number'>3854698763</span>, <span class='number'>2717568474</span>,
<span class='number'>1576568959</span>, <span class='number'>3507990155</span>, <span class='number'>179069555</span>, <span class='number'>141456972</span>, <span class='number'>2478885421</span>));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_64_true_values</span>() {
<span class='kw'>let</span> <span class='ident'>seed</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='number'>1</span>, <span class='number'>23</span>, <span class='number'>456</span>, <span class='number'>7890</span>, <span class='number'>12345</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ra</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='comment'>// Regression test that isaac is actually using the above vector</span>
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>ra</span>.<span class='ident'>next_u64</span>()).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>>></span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>,
<span class='macro'>vec</span><span class='macro'>!</span>(<span class='number'>547121783600835980</span>, <span class='number'>14377643087320773276</span>, <span class='number'>17351601304698403469</span>,
<span class='number'>1238879483818134882</span>, <span class='number'>11952566807690396487</span>, <span class='number'>13970131091560099343</span>,
<span class='number'>4469761996653280935</span>, <span class='number'>15552757044682284409</span>, <span class='number'>6860251611068737823</span>,
<span class='number'>13722198873481261842</span>));
<span class='kw'>let</span> <span class='ident'>seed</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='number'>12345</span>, <span class='number'>67890</span>, <span class='number'>54321</span>, <span class='number'>9876</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rb</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='comment'>// skip forward to the 10000th number</span>
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>10000</span> { <span class='ident'>rb</span>.<span class='ident'>next_u64</span>(); }
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>rb</span>.<span class='ident'>next_u64</span>()).<span class='ident'>collect</span>::<span class='op'><</span><span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>>></span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>,
<span class='macro'>vec</span><span class='macro'>!</span>(<span class='number'>18143823860592706164</span>, <span class='number'>8491801882678285927</span>, <span class='number'>2699425367717515619</span>,
<span class='number'>17196852593171130876</span>, <span class='number'>2606123525235546165</span>, <span class='number'>15790932315217671084</span>,
<span class='number'>596345674630742204</span>, <span class='number'>9947027391921273664</span>, <span class='number'>11788097613744130851</span>,
<span class='number'>10391409374914919106</span>));
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_rng_clone</span>() {
<span class='kw'>let</span> <span class='ident'>seed</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='number'>1</span>, <span class='number'>23</span>, <span class='number'>456</span>, <span class='number'>7890</span>, <span class='number'>12345</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span>: <span class='ident'>Isaac64Rng</span> <span class='op'>=</span> <span class='ident'>SeedableRng</span>::<span class='ident'>from_seed</span>(<span class='ident'>seed</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>clone</span> <span class='op'>=</span> <span class='ident'>rng</span>.<span class='ident'>clone</span>();
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>16</span> {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>rng</span>.<span class='ident'>next_u64</span>(), <span class='ident'>clone</span>.<span class='ident'>next_u64</span>());
}
}
}
</pre>
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