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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">size_of</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;
<span class="doccomment">/// Slice (contiguous data) iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterator element type is `T` (by value).</span>
<span class="doccomment">/// This iterator exists mainly to have the constructor from a pair</span>
<span class="doccomment">/// of raw pointers available, which the libcore slice iterator does not allow.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementation note: Aliasing/optimization issues disappear if we use</span>
<span class="doccomment">/// non-pointer iterator element type, so we use `T`. (The libcore slice</span>
<span class="doccomment">/// iterator has `assume` and other tools available to combat it).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `T` must not be a zero sized type.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>,
<span class="ident">end</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>,
<span class="ident">ty</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Copy</span> <span class="kw">for</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { }
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</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="self">Self</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">T</span><span class="op">></span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</span>
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">end</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">!=</span> <span class="number">0</span>);
<span class="ident">SliceCopyIter</span> {
<span class="ident">ptr</span>: <span class="ident">ptr</span>,
<span class="ident">end</span>: <span class="ident">end</span>,
<span class="ident">ty</span>: <span class="ident">PhantomData</span>,
}
}
<span class="doccomment">/// Return the start, end pointer of the iterator</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_raw</span>(<span class="self">self</span>) <span class="op">-></span> (<span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) {
(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</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="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">!=</span> <span class="self">self</span>.<span class="ident">end</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">elt</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span>);
<span class="self">self</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="number">1</span>);
<span class="ident">elt</span>
}
} <span class="kw">else</span> {
<span class="prelude-val">None</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">end</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">/</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>();
(<span class="ident">len</span>, <span class="prelude-val">Some</span>(<span class="ident">len</span>))
}
<span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">len</span>()
}
<span class="kw">fn</span> <span class="ident">last</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="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">next_back</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</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="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">!=</span> <span class="self">self</span>.<span class="ident">end</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">end</span>.<span class="ident">offset</span>(<span class="op">-</span><span class="number">1</span>);
<span class="kw">let</span> <span class="ident">elt</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">end</span>);
<span class="ident">elt</span>
}
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</span> { }
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</span>
{
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">slice</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="self">Self</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">!=</span> <span class="number">0</span>);
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">slice</span>.<span class="ident">as_ptr</span>();
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">slice</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">SliceCopyIter</span>::<span class="ident">new</span>(<span class="ident">ptr</span>, <span class="ident">end</span>)
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">SliceCopyIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</span>
{
<span class="doccomment">/// Create an empty `SliceCopyIter`.</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="self">Self</span> {
<span class="kw">unsafe</span> {
<span class="ident">SliceCopyIter</span>::<span class="ident">new</span>(<span class="number">0x1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="number">0x1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>)
}
}
}
</pre>
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