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</pre><pre class="rust ">
<span class="doccomment">//! Odds and ends — collection miscellania.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - Utilities for debug-checked, release-unchecked indexing and slicing</span>
<span class="doccomment">//! - Fixpoint combinator for closures</span>
<span class="doccomment">//! - String and Vec extensions</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The **odds** crate has the following crate feature flags:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - `std`</span>
<span class="doccomment">//! - Default</span>
<span class="doccomment">//! - Requires Rust 1.6 *to opt out of*</span>
<span class="doccomment">//! - Use libstd and std features.</span>
<span class="doccomment">//! - `unstable`.</span>
<span class="doccomment">//! - Optional.</span>
<span class="doccomment">//! - Requires nightly channel.</span>
<span class="doccomment">//! - Implement the closure traits for **Fix**.</span>
<span class="doccomment">//!</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">doc</span>(<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://docs.rs/odds/0.2/"</span>)]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"unstable"</span>, <span class="ident">feature</span>(<span class="ident">unboxed_closures</span>, <span class="ident">fn_traits</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"std"</span>), <span class="ident">no_std</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"std"</span>))]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">core</span> <span class="kw">as</span> <span class="ident">std</span>;
<span class="kw">mod</span> <span class="ident">range</span>;
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"fix.rs"</span>]</span>
<span class="kw">mod</span> <span class="ident">fix_impl</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">char</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">string</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">vec</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">slice</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">stride</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">fix_impl</span>::<span class="ident">Fix</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">fix_impl</span>::<span class="ident">fix</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">range</span>::<span class="ident">IndexRange</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="doccomment">/// prelude of often used traits and functions</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">prelude</span> {
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">slice</span>::<span class="ident">SliceFind</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">slice</span>::<span class="ident">SliceIterExt</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">string</span>::<span class="ident">StrExt</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">string</span>::<span class="ident">StrChunksWindows</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">string</span>::<span class="ident">StringExt</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">vec</span>::{<span class="ident">vec</span>, <span class="ident">VecExt</span>};
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">no_inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">IndexRange</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">no_inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">fix</span>;
}
<span class="doccomment">/// Compare if **a** and **b** are equal *as pointers*.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ref_eq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="kw-2">&</span><span class="ident">T</span>, <span class="ident">b</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">ptr_eq</span>(<span class="ident">a</span>, <span class="ident">b</span>)
}
<span class="doccomment">/// Compare if **a** and **b** are equal pointers.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ptr_eq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">a</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">b</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">a</span> <span class="op">==</span> <span class="ident">b</span>
}
<span class="doccomment">/// Safe to use with any wholly initialized memory `ptr`</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">raw_byte_repr</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] {
<span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(
<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _ <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>,
<span class="ident">mem</span>::<span class="ident">size_of_val</span>(<span class="ident">ptr</span>),
)
}
<span class="doccomment">/// Use `debug_assert!` to check indexing in debug mode. In release mode, no checks are done.</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">get_unchecked</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">&</span>[<span class="ident">T</span>], <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">index</span> <span class="op"><</span> <span class="ident">data</span>.<span class="ident">len</span>());
<span class="ident">data</span>.<span class="ident">get_unchecked</span>(<span class="ident">index</span>)
}
<span class="doccomment">/// Use `debug_assert!` to check indexing in debug mode. In release mode, no checks are done.</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">get_unchecked_mut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">index</span> <span class="op"><</span> <span class="ident">data</span>.<span class="ident">len</span>());
<span class="ident">data</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">index</span>)
}
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">unreachable</span>() <span class="op">-></span> <span class="op">!</span> {
<span class="kw">enum</span> <span class="ident">Void</span> { }
<span class="kw">match</span> <span class="kw-2">*</span>(<span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Void</span>) {
<span class="comment">/* unreachable */</span>
}
}
<span class="doccomment">/// Act as `debug_assert!` in debug mode, asserting that this point is not reached.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In release mode, no checks are done, and it acts like the `unreachable` intrinsic.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">debug_assert_unreachable</span>() <span class="op">-></span> <span class="op">!</span> {
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="bool-val">false</span>, <span class="string">"Entered unreachable section, this is a bug!"</span>);
<span class="ident">unreachable</span>()
}
<span class="doccomment">/// Check slicing bounds in debug mode, otherwise just act as an unchecked</span>
<span class="doccomment">/// slice call.</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">slice_unchecked</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">&</span>[<span class="ident">T</span>], <span class="ident">from</span>: <span class="ident">usize</span>, <span class="ident">to</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="macro">debug_assert</span><span class="macro">!</span>((<span class="kw-2">&</span><span class="ident">data</span>[<span class="ident">from</span>..<span class="ident">to</span>], <span class="bool-val">true</span>).<span class="number">1</span>);
<span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="ident">data</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">from</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">to</span> <span class="op">-</span> <span class="ident">from</span>)
}
<span class="doccomment">/// Check slicing bounds in debug mode, otherwise just act as an unchecked</span>
<span class="doccomment">/// slice call.</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">slice_unchecked_mut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="ident">from</span>: <span class="ident">usize</span>, <span class="ident">to</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] {
<span class="macro">debug_assert</span><span class="macro">!</span>((<span class="kw-2">&</span><span class="ident">data</span>[<span class="ident">from</span>..<span class="ident">to</span>], <span class="bool-val">true</span>).<span class="number">1</span>);
<span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">data</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">from</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">to</span> <span class="op">-</span> <span class="ident">from</span>)
}
<span class="doccomment">/// Create a length 1 slice out of a reference</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ref_slice</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="kw">unsafe</span> {
<span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="ident">ptr</span>, <span class="number">1</span>)
}
}
<span class="doccomment">/// Create a length 1 mutable slice out of a reference</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ref_slice_mut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">ptr</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] {
<span class="kw">unsafe</span> {
<span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">ptr</span>, <span class="number">1</span>)
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_repr</span>() {
<span class="kw">unsafe</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">raw_byte_repr</span>(<span class="kw-2">&</span><span class="number">17u8</span>), <span class="kw-2">&</span>[<span class="number">17</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">raw_byte_repr</span>(<span class="string">"abc"</span>), <span class="string">"abc"</span>.<span class="ident">as_bytes</span>());
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="kw">fn</span> <span class="ident">test_get_unchecked_1</span>() {
<span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>)) {
<span class="macro">panic</span><span class="macro">!</span>();
}
<span class="kw">unsafe</span> {
<span class="ident">get_unchecked</span>(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="number">3</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="kw">fn</span> <span class="ident">test_slice_unchecked_1</span>() {
<span class="comment">// These tests only work in debug mode</span>
<span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>)) {
<span class="macro">panic</span><span class="macro">!</span>();
}
<span class="kw">unsafe</span> {
<span class="ident">slice_unchecked</span>(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="number">0</span>, <span class="number">4</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="kw">fn</span> <span class="ident">test_slice_unchecked_2</span>() {
<span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>)) {
<span class="macro">panic</span><span class="macro">!</span>();
}
<span class="kw">unsafe</span> {
<span class="ident">slice_unchecked</span>(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="number">4</span>, <span class="number">4</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_slice_unchecked_3</span>() {
<span class="comment">// This test only works in release mode</span>
<span class="comment">// test some benign unchecked slicing</span>
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let</span> <span class="ident">sl</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">data</span>[<span class="number">0</span>..<span class="number">0</span>];
<span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">debug_assertions</span>) {
<span class="comment">/* silent */</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">slice_unchecked</span>(<span class="ident">sl</span>, <span class="number">0</span>, <span class="number">4</span>), <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
}
}
}
</pre>
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