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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'>//! Generating numbers between two others.</span>
<span class='comment'>// this is surprisingly complicated to be both generic & correct</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='kw'>use</span> <span class='ident'>distributions</span>::{<span class='ident'>Sample</span>, <span class='ident'>IndependentSample</span>};
<span class='doccomment'>/// Sample values uniformly between two bounds.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This gives a uniform distribution (assuming the RNG used to sample</span>
<span class='doccomment'>/// it is itself uniform & the `SampleRange` implementation for the</span>
<span class='doccomment'>/// given type is correct), even for edge cases like `low = 0u8`,</span>
<span class='doccomment'>/// `high = 170u8`, for which a naive modulo operation would return</span>
<span class='doccomment'>/// numbers less than 85 with double the probability to those greater</span>
<span class='doccomment'>/// than 85.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Types should attempt to sample in `[low, high)`, i.e., not</span>
<span class='doccomment'>/// including `high`, but this may be very difficult. All the</span>
<span class='doccomment'>/// primitive integer types satisfy this property, and the float types</span>
<span class='doccomment'>/// normally satisfy it, but rounding may mean `high` can occur.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Example</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust</span>
<span class='doccomment'>/// use rand::distributions::{IndependentSample, Range};</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// fn main() {</span>
<span class='doccomment'>/// let between = Range::new(10, 10000);</span>
<span class='doccomment'>/// let mut rng = rand::thread_rng();</span>
<span class='doccomment'>/// let mut sum = 0;</span>
<span class='doccomment'>/// for _ in 0..1000 {</span>
<span class='doccomment'>/// sum += between.ind_sample(&mut rng);</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// println!("{}", sum);</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Range</span><span class='op'><</span><span class='ident'>X</span><span class='op'>></span> {
<span class='ident'>low</span>: <span class='ident'>X</span>,
<span class='ident'>range</span>: <span class='ident'>X</span>,
<span class='ident'>accept_zone</span>: <span class='ident'>X</span>
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>X</span>: <span class='ident'>SampleRange</span> <span class='op'>+</span> <span class='ident'>PartialOrd</span><span class='op'>></span> <span class='ident'>Range</span><span class='op'><</span><span class='ident'>X</span><span class='op'>></span> {
<span class='doccomment'>/// Create a new `Range` instance that samples uniformly from</span>
<span class='doccomment'>/// `[low, high)`. Panics if `low >= high`.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>low</span>: <span class='ident'>X</span>, <span class='ident'>high</span>: <span class='ident'>X</span>) <span class='op'>-></span> <span class='ident'>Range</span><span class='op'><</span><span class='ident'>X</span><span class='op'>></span> {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>low</span> <span class='op'><</span> <span class='ident'>high</span>, <span class='string'>"Range::new called with `low >= high`"</span>);
<span class='ident'>SampleRange</span>::<span class='ident'>construct_range</span>(<span class='ident'>low</span>, <span class='ident'>high</span>)
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>Sup</span>: <span class='ident'>SampleRange</span><span class='op'>></span> <span class='ident'>Sample</span><span class='op'><</span><span class='ident'>Sup</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>Range</span><span class='op'><</span><span class='ident'>Sup</span><span class='op'>></span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>sample</span><span class='op'><</span><span class='ident'>R</span>: <span class='ident'>Rng</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>rng</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>R</span>) <span class='op'>-></span> <span class='ident'>Sup</span> { <span class='self'>self</span>.<span class='ident'>ind_sample</span>(<span class='ident'>rng</span>) }
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>Sup</span>: <span class='ident'>SampleRange</span><span class='op'>></span> <span class='ident'>IndependentSample</span><span class='op'><</span><span class='ident'>Sup</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>Range</span><span class='op'><</span><span class='ident'>Sup</span><span class='op'>></span> {
<span class='kw'>fn</span> <span class='ident'>ind_sample</span><span class='op'><</span><span class='ident'>R</span>: <span class='ident'>Rng</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>rng</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>R</span>) <span class='op'>-></span> <span class='ident'>Sup</span> {
<span class='ident'>SampleRange</span>::<span class='ident'>sample_range</span>(<span class='self'>self</span>, <span class='ident'>rng</span>)
}
}
<span class='doccomment'>/// The helper trait for types that have a sensible way to sample</span>
<span class='doccomment'>/// uniformly between two values. This should not be used directly,</span>
<span class='doccomment'>/// and is only to facilitate `Range`.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>SampleRange</span> : <span class='ident'>Sized</span> {
<span class='doccomment'>/// Construct the `Range` object that `sample_range`</span>
<span class='doccomment'>/// requires. This should not ever be called directly, only via</span>
<span class='doccomment'>/// `Range::new`, which will check that `low < high`, so this</span>
<span class='doccomment'>/// function doesn't have to repeat the check.</span>
<span class='kw'>fn</span> <span class='ident'>construct_range</span>(<span class='ident'>low</span>: <span class='self'>Self</span>, <span class='ident'>high</span>: <span class='self'>Self</span>) <span class='op'>-></span> <span class='ident'>Range</span><span class='op'><</span><span class='self'>Self</span><span class='op'>></span>;
<span class='doccomment'>/// Sample a value from the given `Range` with the given `Rng` as</span>
<span class='doccomment'>/// a source of randomness.</span>
<span class='kw'>fn</span> <span class='ident'>sample_range</span><span class='op'><</span><span class='ident'>R</span>: <span class='ident'>Rng</span><span class='op'>></span>(<span class='ident'>r</span>: <span class='kw-2'>&</span><span class='ident'>Range</span><span class='op'><</span><span class='self'>Self</span><span class='op'>></span>, <span class='ident'>rng</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>R</span>) <span class='op'>-></span> <span class='self'>Self</span>;
}
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>integer_impl</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>:<span class='ident'>ty</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span>:<span class='ident'>ident</span>) <span class='op'>=></span> {
<span class='kw'>impl</span> <span class='ident'>SampleRange</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span> {
<span class='comment'>// we play free and fast with unsigned vs signed here</span>
<span class='comment'>// (when $ty is signed), but that's fine, since the</span>
<span class='comment'>// contract of this macro is for $ty and $unsigned to be</span>
<span class='comment'>// "bit-equal", so casting between them is a no-op & a</span>
<span class='comment'>// bijection.</span>
<span class='kw'>fn</span> <span class='ident'>construct_range</span>(<span class='ident'>low</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>, <span class='ident'>high</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>) <span class='op'>-></span> <span class='ident'>Range</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>range</span> <span class='op'>=</span> (<span class='ident'>w</span>(<span class='ident'>high</span> <span class='kw'>as</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span>) <span class='op'>-</span> <span class='ident'>w</span>(<span class='ident'>low</span> <span class='kw'>as</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span>)).<span class='number'>0</span>;
<span class='kw'>let</span> <span class='ident'>unsigned_max</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span> <span class='op'>=</span> ::<span class='ident'>std</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span>::<span class='ident'>MAX</span>;
<span class='comment'>// this is the largest number that fits into $unsigned</span>
<span class='comment'>// that `range` divides evenly, so, if we've sampled</span>
<span class='comment'>// `n` uniformly from this region, then `n % range` is</span>
<span class='comment'>// uniform in [0, range)</span>
<span class='kw'>let</span> <span class='ident'>zone</span> <span class='op'>=</span> <span class='ident'>unsigned_max</span> <span class='op'>-</span> <span class='ident'>unsigned_max</span> <span class='op'>%</span> <span class='ident'>range</span>;
<span class='ident'>Range</span> {
<span class='ident'>low</span>: <span class='ident'>low</span>,
<span class='ident'>range</span>: <span class='ident'>range</span> <span class='kw'>as</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>,
<span class='ident'>accept_zone</span>: <span class='ident'>zone</span> <span class='kw'>as</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>
}
}
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>sample_range</span><span class='op'><</span><span class='ident'>R</span>: <span class='ident'>Rng</span><span class='op'>></span>(<span class='ident'>r</span>: <span class='kw-2'>&</span><span class='ident'>Range</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span><span class='op'>></span>, <span class='ident'>rng</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>R</span>) <span class='op'>-></span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span> {
<span class='kw'>loop</span> {
<span class='comment'>// rejection sample</span>
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>rng</span>.<span class='ident'>gen</span>::<span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span><span class='op'>></span>();
<span class='comment'>// until we find something that fits into the</span>
<span class='comment'>// region which r.range evenly divides (this will</span>
<span class='comment'>// be uniformly distributed)</span>
<span class='kw'>if</span> <span class='ident'>v</span> <span class='op'><</span> <span class='ident'>r</span>.<span class='ident'>accept_zone</span> <span class='kw'>as</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span> {
<span class='comment'>// and return it, with some adjustments</span>
<span class='kw'>return</span> (<span class='ident'>w</span>(<span class='ident'>r</span>.<span class='ident'>low</span>) <span class='op'>+</span> <span class='ident'>w</span>((<span class='ident'>v</span> <span class='op'>%</span> <span class='ident'>r</span>.<span class='ident'>range</span> <span class='kw'>as</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>unsigned</span>) <span class='kw'>as</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>)).<span class='number'>0</span>;
}
}
}
}
}
}
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>i8</span>, <span class='ident'>u8</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>i16</span>, <span class='ident'>u16</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>i32</span>, <span class='ident'>u32</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>i64</span>, <span class='ident'>u64</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>isize</span>, <span class='ident'>usize</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>u8</span>, <span class='ident'>u8</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>u16</span>, <span class='ident'>u16</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>u32</span>, <span class='ident'>u32</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>u64</span>, <span class='ident'>u64</span> }
<span class='macro'>integer_impl</span><span class='macro'>!</span> { <span class='ident'>usize</span>, <span class='ident'>usize</span> }
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>float_impl</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>:<span class='ident'>ty</span>) <span class='op'>=></span> {
<span class='kw'>impl</span> <span class='ident'>SampleRange</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span> {
<span class='kw'>fn</span> <span class='ident'>construct_range</span>(<span class='ident'>low</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>, <span class='ident'>high</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>) <span class='op'>-></span> <span class='ident'>Range</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span><span class='op'>></span> {
<span class='ident'>Range</span> {
<span class='ident'>low</span>: <span class='ident'>low</span>,
<span class='ident'>range</span>: <span class='ident'>high</span> <span class='op'>-</span> <span class='ident'>low</span>,
<span class='ident'>accept_zone</span>: <span class='number'>0.0</span> <span class='comment'>// unused</span>
}
}
<span class='kw'>fn</span> <span class='ident'>sample_range</span><span class='op'><</span><span class='ident'>R</span>: <span class='ident'>Rng</span><span class='op'>></span>(<span class='ident'>r</span>: <span class='kw-2'>&</span><span class='ident'>Range</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span><span class='op'>></span>, <span class='ident'>rng</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>R</span>) <span class='op'>-></span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span> {
<span class='ident'>r</span>.<span class='ident'>low</span> <span class='op'>+</span> <span class='ident'>r</span>.<span class='ident'>range</span> <span class='op'>*</span> <span class='ident'>rng</span>.<span class='ident'>gen</span>::<span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span><span class='op'>></span>()
}
}
}
}
<span class='macro'>float_impl</span><span class='macro'>!</span> { <span class='ident'>f32</span> }
<span class='macro'>float_impl</span><span class='macro'>!</span> { <span class='ident'>f64</span> }
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
<span class='kw'>use</span> <span class='ident'>distributions</span>::{<span class='ident'>Sample</span>, <span class='ident'>IndependentSample</span>};
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>Range</span> <span class='kw'>as</span> <span class='ident'>Range</span>;
<span class='attribute'>#[<span class='ident'>should_panic</span>]</span>
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_range_bad_limits_equal</span>() {
<span class='ident'>Range</span>::<span class='ident'>new</span>(<span class='number'>10</span>, <span class='number'>10</span>);
}
<span class='attribute'>#[<span class='ident'>should_panic</span>]</span>
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_range_bad_limits_flipped</span>() {
<span class='ident'>Range</span>::<span class='ident'>new</span>(<span class='number'>10</span>, <span class='number'>5</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_integers</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span> <span class='op'>=</span> ::<span class='ident'>test</span>::<span class='ident'>rng</span>();
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>t</span> {
($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>:<span class='ident'>ident</span>),<span class='kw-2'>*</span>) <span class='op'>=></span> {{
$(
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='kw-2'>&</span>[(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>)] <span class='op'>=</span> <span class='kw-2'>&</span>[(<span class='number'>0</span>, <span class='number'>10</span>),
(<span class='number'>10</span>, <span class='number'>127</span>),
(::<span class='ident'>std</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>::<span class='ident'>MIN</span>, ::<span class='ident'>std</span>::<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>::<span class='ident'>MAX</span>)];
<span class='kw'>for</span> <span class='kw-2'>&</span>(<span class='ident'>low</span>, <span class='ident'>high</span>) <span class='kw'>in</span> <span class='ident'>v</span>.<span class='ident'>iter</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>sampler</span>: <span class='ident'>Range</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>Range</span>::<span class='ident'>new</span>(<span class='ident'>low</span>, <span class='ident'>high</span>);
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>1000</span> {
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>sampler</span>.<span class='ident'>sample</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>rng</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>low</span> <span class='op'><=</span> <span class='ident'>v</span> <span class='op'>&&</span> <span class='ident'>v</span> <span class='op'><</span> <span class='ident'>high</span>);
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>sampler</span>.<span class='ident'>ind_sample</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>rng</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>low</span> <span class='op'><=</span> <span class='ident'>v</span> <span class='op'>&&</span> <span class='ident'>v</span> <span class='op'><</span> <span class='ident'>high</span>);
}
}
)<span class='op'>*</span>
}}
}
<span class='macro'>t</span><span class='macro'>!</span>(<span class='ident'>i8</span>, <span class='ident'>i16</span>, <span class='ident'>i32</span>, <span class='ident'>i64</span>, <span class='ident'>isize</span>,
<span class='ident'>u8</span>, <span class='ident'>u16</span>, <span class='ident'>u32</span>, <span class='ident'>u64</span>, <span class='ident'>usize</span>)
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_floats</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span> <span class='op'>=</span> ::<span class='ident'>test</span>::<span class='ident'>rng</span>();
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>t</span> {
($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>:<span class='ident'>ty</span>),<span class='kw-2'>*</span>) <span class='op'>=></span> {{
$(
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='kw-2'>&</span>[(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span>)] <span class='op'>=</span> <span class='kw-2'>&</span>[(<span class='number'>0.0</span>, <span class='number'>100.0</span>),
(<span class='op'>-</span><span class='number'>1e35</span>, <span class='op'>-</span><span class='number'>1e25</span>),
(<span class='number'>1e-35</span>, <span class='number'>1e-25</span>),
(<span class='op'>-</span><span class='number'>1e35</span>, <span class='number'>1e35</span>)];
<span class='kw'>for</span> <span class='kw-2'>&</span>(<span class='ident'>low</span>, <span class='ident'>high</span>) <span class='kw'>in</span> <span class='ident'>v</span>.<span class='ident'>iter</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>sampler</span>: <span class='ident'>Range</span><span class='op'><</span><span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ty</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>Range</span>::<span class='ident'>new</span>(<span class='ident'>low</span>, <span class='ident'>high</span>);
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>1000</span> {
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>sampler</span>.<span class='ident'>sample</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>rng</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>low</span> <span class='op'><=</span> <span class='ident'>v</span> <span class='op'>&&</span> <span class='ident'>v</span> <span class='op'><</span> <span class='ident'>high</span>);
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>sampler</span>.<span class='ident'>ind_sample</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>rng</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>low</span> <span class='op'><=</span> <span class='ident'>v</span> <span class='op'>&&</span> <span class='ident'>v</span> <span class='op'><</span> <span class='ident'>high</span>);
}
}
)<span class='op'>*</span>
}}
}
<span class='macro'>t</span><span class='macro'>!</span>(<span class='ident'>f32</span>, <span class='ident'>f64</span>)
}
}
</pre>
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