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</pre><pre class="rust ">
<span class="doccomment">//! Slice iterator with custom step size</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Performance note: Using stable Rust features, these iterators</span>
<span class="doccomment">//! don't quite live up to the efficiency that they should have,</span>
<span class="doccomment">//! unfortunately.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Licensed under the Apache License, Version 2.0</span>
<span class="doccomment">//! http://www.apache.org/licenses/LICENSE-2.0 or the MIT license</span>
<span class="doccomment">//! http://opensource.org/licenses/MIT, at your</span>
<span class="doccomment">//! option. This file may not be copied, modified, or distributed</span>
<span class="doccomment">//! except according to those terms.</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::{<span class="ident">Index</span>, <span class="ident">IndexMut</span>};
<span class="doccomment">/// (the stride) skipped per iteration.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Stride` does not support zero-sized types for `A`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `&'a A`.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// base pointer -- does not change during iteration</span>
<span class="ident">begin</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">A</span>,
<span class="doccomment">/// current offset from begin</span>
<span class="ident">offset</span>: <span class="ident">isize</span>,
<span class="doccomment">/// offset where we end (exclusive end).</span>
<span class="ident">end</span>: <span class="ident">isize</span>,
<span class="ident">stride</span>: <span class="ident">isize</span>,
<span class="ident">life</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">A</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Copy</span> <span class="kw">for</span> <span class="ident">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> {}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Sync</span> {}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Sync</span> {}
<span class="doccomment">/// The mutable equivalent of Stride.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `StrideMut` does not support zero-sized types for `A`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `&'a mut A`.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">StrideMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">begin</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">A</span>,
<span class="ident">offset</span>: <span class="ident">isize</span>,
<span class="ident">end</span>: <span class="ident">isize</span>,
<span class="ident">stride</span>: <span class="ident">isize</span>,
<span class="ident">life</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">A</span><span class="op">></span>,
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">StrideMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Send</span> {}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">StrideMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Sync</span> {}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> {
<span class="doccomment">/// Create a Stride iterator from a raw pointer.</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_ptr_len</span>(<span class="ident">begin</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">A</span>, <span class="ident">nelem</span>: <span class="ident">usize</span>, <span class="ident">stride</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="ident">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="ident">Stride</span> {
<span class="ident">begin</span>: <span class="ident">begin</span>,
<span class="ident">offset</span>: <span class="number">0</span>,
<span class="ident">end</span>: <span class="ident">stride</span> <span class="op">*</span> <span class="ident">nelem</span> <span class="kw">as</span> <span class="ident">isize</span>,
<span class="ident">stride</span>: <span class="ident">stride</span>,
<span class="ident">life</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">StrideMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="doccomment">/// Create a StrideMut iterator from a raw pointer.</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_ptr_len</span>(<span class="ident">begin</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">A</span>, <span class="ident">nelem</span>: <span class="ident">usize</span>, <span class="ident">stride</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="ident">StrideMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="ident">StrideMut</span> {
<span class="ident">begin</span>: <span class="ident">begin</span>,
<span class="ident">offset</span>: <span class="number">0</span>,
<span class="ident">end</span>: <span class="ident">stride</span> <span class="op">*</span> <span class="ident">nelem</span> <span class="kw">as</span> <span class="ident">isize</span>,
<span class="ident">stride</span>: <span class="ident">stride</span>,
<span class="ident">life</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span>,
}
}
}
<span class="kw">fn</span> <span class="ident">div_rem</span>(<span class="ident">x</span>: <span class="ident">usize</span>, <span class="ident">d</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="ident">usize</span>) {
(<span class="ident">x</span> <span class="op">/</span> <span class="ident">d</span>, <span class="ident">x</span> <span class="op">%</span> <span class="ident">d</span>)
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">stride_impl</span> {
(<span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">slice</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">getptr</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>:<span class="ident">ty</span>) <span class="op">=></span> {
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="doccomment">/// Create Stride iterator from a slice and the element step count.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If `step` is negative, start from the back.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use odds::stride::Stride;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let xs = [0, 1, 2, 3, 4, 5];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let front = Stride::from_slice(&xs, 2);</span>
<span class="doccomment">/// assert_eq!(front[0], 0);</span>
<span class="doccomment">/// assert_eq!(front[1], 2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let back = Stride::from_slice(&xs, -2);</span>
<span class="doccomment">/// assert_eq!(back[0], 5);</span>
<span class="doccomment">/// assert_eq!(back[1], 3);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if values of type `A` are zero-sized. <br></span>
<span class="doccomment">/// **Panics** if `step` is 0.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_slice</span>(<span class="ident">xs</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">slice</span>, <span class="ident">step</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">A</span><span class="op">></span>() <span class="op">!=</span> <span class="number">0</span>);
<span class="kw">let</span> <span class="ident">ustep</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">step</span> <span class="op"><</span> <span class="number">0</span> { <span class="op">-</span><span class="ident">step</span> } <span class="kw">else</span> { <span class="ident">step</span> } <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">nelem</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">ustep</span> <span class="op"><=</span> <span class="number">1</span> {
<span class="ident">xs</span>.<span class="ident">len</span>()
} <span class="kw">else</span> {
<span class="kw">let</span> (<span class="ident">d</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">div_rem</span>(<span class="ident">xs</span>.<span class="ident">len</span>(), <span class="ident">ustep</span>);
<span class="ident">d</span> <span class="op">+</span> <span class="kw">if</span> <span class="ident">r</span> <span class="op">></span> <span class="number">0</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> }
};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">begin</span> <span class="op">=</span> <span class="ident">xs</span>. <span class="macro-nonterminal">$</span><span class="macro-nonterminal">getptr</span> ();
<span class="kw">unsafe</span> {
<span class="kw">if</span> <span class="ident">step</span> <span class="op">></span> <span class="number">0</span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>::<span class="ident">from_ptr_len</span>(<span class="ident">begin</span>, <span class="ident">nelem</span>, <span class="ident">step</span>)
} <span class="kw">else</span> {
<span class="kw">if</span> <span class="ident">nelem</span> <span class="op">!=</span> <span class="number">0</span> {
<span class="ident">begin</span> <span class="op">=</span> <span class="ident">begin</span>.<span class="ident">offset</span>(<span class="ident">xs</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span> <span class="op">-</span> <span class="number">1</span>)
}
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>::<span class="ident">from_ptr_len</span>(<span class="ident">begin</span>, <span class="ident">nelem</span>, <span class="ident">step</span>)
}
}
}
<span class="doccomment">/// Create Stride iterator from an existing Stride iterator</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if `step` is 0.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_stride</span>(<span class="kw-2">mut</span> <span class="ident">it</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>, <span class="kw-2">mut</span> <span class="ident">step</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">step</span> <span class="op">!=</span> <span class="number">0</span>);
<span class="kw">if</span> <span class="ident">step</span> <span class="op"><</span> <span class="number">0</span> {
<span class="ident">it</span>.<span class="ident">swap_ends</span>();
<span class="ident">step</span> <span class="op">=</span> <span class="op">-</span><span class="ident">step</span>;
}
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> (<span class="ident">it</span>.<span class="ident">end</span> <span class="op">-</span> <span class="ident">it</span>.<span class="ident">offset</span>) <span class="op">/</span> <span class="ident">it</span>.<span class="ident">stride</span>;
<span class="kw">let</span> <span class="ident">newstride</span> <span class="op">=</span> <span class="ident">it</span>.<span class="ident">stride</span> <span class="op">*</span> <span class="ident">step</span>;
<span class="kw">let</span> (<span class="ident">d</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">div_rem</span>(<span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">step</span> <span class="kw">as</span> <span class="ident">usize</span>);
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">d</span> <span class="op">+</span> <span class="kw">if</span> <span class="ident">r</span> <span class="op">></span> <span class="number">0</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> };
<span class="kw">unsafe</span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>::<span class="ident">from_ptr_len</span>(<span class="ident">it</span>.<span class="ident">begin</span>, <span class="ident">len</span>, <span class="ident">newstride</span>)
}
}
<span class="doccomment">/// Swap the begin and end and reverse the stride,</span>
<span class="doccomment">/// in effect reversing the iterator.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap_ends</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">end</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">offset</span>) <span class="op">/</span> <span class="self">self</span>.<span class="ident">stride</span>;
<span class="kw">if</span> <span class="ident">len</span> <span class="op">></span> <span class="number">0</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">endptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">begin</span>.<span class="ident">offset</span>((<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>) <span class="op">*</span> <span class="self">self</span>.<span class="ident">stride</span>);
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>::<span class="ident">from_ptr_len</span>(<span class="ident">endptr</span>, <span class="ident">len</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="op">-</span><span class="self">self</span>.<span class="ident">stride</span>);
}
}
}
<span class="doccomment">/// Return the number of elements in the iterator.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
((<span class="self">self</span>.<span class="ident">end</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">offset</span>) <span class="op">/</span> <span class="self">self</span>.<span class="ident">stride</span>) <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="doccomment">/// Return a reference to the element of a stride at the</span>
<span class="doccomment">/// given index, or None if the index is out of bounds.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">A</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">len</span>() {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">begin</span>.<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">stride</span> <span class="op">*</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>));
<span class="prelude-val">Some</span>(<span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">ptr</span>))
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span><span class="op">></span>
{
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">offset</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">end</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">elt</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span> <span class="op">=</span>
<span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="self">self</span>.<span class="ident">begin</span>.<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">offset</span>));
<span class="self">self</span>.<span class="ident">offset</span> <span class="op">+=</span> <span class="self">self</span>.<span class="ident">stride</span>;
<span class="prelude-val">Some</span>(<span class="ident">elt</span>)
}
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
(<span class="ident">len</span>, <span class="prelude-val">Some</span>(<span class="ident">len</span>))
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span><span class="op">></span>
{
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">offset</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">end</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">end</span> <span class="op">-=</span> <span class="self">self</span>.<span class="ident">stride</span>;
<span class="kw">let</span> <span class="ident">elt</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="self">self</span>.<span class="ident">begin</span>.<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">end</span>));
<span class="prelude-val">Some</span>(<span class="ident">elt</span>)
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> { }
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Index</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
{
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">A</span>;
<span class="doccomment">/// Return a reference to the element at a given index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the index is out of bounds.</span>
<span class="kw">fn</span> <span class="ident">index</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">A</span>
{
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">i</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">len</span>());
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">begin</span>.<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">stride</span> <span class="op">*</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>));
<span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">ptr</span>)
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">A</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span>
{
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span>
{
<span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"["</span>));
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">len</span>() {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">!=</span> <span class="number">0</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">", "</span>));
}
<span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:?}"</span>, (<span class="kw-2">*</span><span class="self">self</span>)[<span class="ident">i</span>]));
}
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"]"</span>)
}
}
}
}
<span class="macro">stride_impl</span><span class="macro">!</span>{<span class="kw">struct</span> <span class="ident">Stride</span> <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">A</span>], <span class="ident">as_ptr</span>, <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">A</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">A</span>}
<span class="macro">stride_impl</span><span class="macro">!</span>{<span class="kw">struct</span> <span class="ident">StrideMut</span> <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">A</span>], <span class="ident">as_mut_ptr</span>, <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">A</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">A</span>}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></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">Stride</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">StrideMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> {
<span class="doccomment">/// Return a mutable reference to the element of a stride at the</span>
<span class="doccomment">/// given index, or None if the index is out of bounds.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="ident">A</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">len</span>() {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">begin</span>.<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">stride</span> <span class="op">*</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>));
<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span>)
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">IndexMut</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="ident">StrideMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">A</span><span class="op">></span> {
<span class="doccomment">/// Return a mutable reference to the element at a given index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// **Panics** if the index is out of bounds.</span>
<span class="kw">fn</span> <span class="ident">index_mut</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="ident">A</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">i</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">len</span>());
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">begin</span>.<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">stride</span> <span class="op">*</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>));
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span>
}
}
}
</pre>
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