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<span id="768">768</span>
<span id="769">769</span>
<span id="770">770</span>
</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright 2020 Shin Yoshida</span>
<span class="comment">//</span>
<span class="comment">// "LGPL-3.0-or-later OR Apache-2.0 OR BSD-2-Clause"</span>
<span class="comment">//</span>
<span class="comment">// This is part of counting-pointer</span>
<span class="comment">//</span>
<span class="comment">// counting-pointer is free software: you can redistribute it and/or modify</span>
<span class="comment">// it under the terms of the GNU Lesser General Public License as published by</span>
<span class="comment">// the Free Software Foundation, either version 3 of the License, or</span>
<span class="comment">// (at your option) any later version.</span>
<span class="comment">//</span>
<span class="comment">// counting-pointer is distributed in the hope that it will be useful,</span>
<span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<span class="comment">// GNU Lesser General Public License for more details.</span>
<span class="comment">//</span>
<span class="comment">// You should have received a copy of the GNU Lesser General Public License</span>
<span class="comment">// along with counting-pointer. If not, see <http://www.gnu.org/licenses/>.</span>
<span class="comment">//</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span>
<span class="comment">// you may not use this file except in compliance with the License.</span>
<span class="comment">// You may obtain a copy of the License at</span>
<span class="comment">//</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="comment">//</span>
<span class="comment">// Unless required by applicable law or agreed to in writing, software</span>
<span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="comment">// See the License for the specific language governing permissions and</span>
<span class="comment">// limitations under the License.</span>
<span class="comment">//</span>
<span class="comment">//</span>
<span class="comment">// Redistribution and use in source and binary forms, with or without modification, are permitted</span>
<span class="comment">// provided that the following conditions are met:</span>
<span class="comment">//</span>
<span class="comment">// 1. Redistributions of source code must retain the above copyright notice, this list of</span>
<span class="comment">// conditions and the following disclaimer.</span>
<span class="comment">// 2. Redistributions in binary form must reproduce the above copyright notice, this</span>
<span class="comment">// list of conditions and the following disclaimer in the documentation and/or other</span>
<span class="comment">// materials provided with the distribution.</span>
<span class="comment">//</span>
<span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND</span>
<span class="comment">// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
<span class="comment">// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.</span>
<span class="comment">// IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,</span>
<span class="comment">// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT</span>
<span class="comment">// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR</span>
<span class="comment">// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span>
<span class="comment">// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span>
<span class="comment">// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span>
<span class="comment">// POSSIBILITY OF SUCH DAMAGE.</span>
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">alloc</span>::{<span class="ident">GlobalAlloc</span>, <span class="ident">Layout</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">any</span>::<span class="ident">Any</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">hash</span>::{<span class="ident">Hash</span>, <span class="ident">Hasher</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">mem</span>::{<span class="self">self</span>, <span class="ident">align_of</span>, <span class="ident">size_of</span>, <span class="ident">MaybeUninit</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::<span class="ident">Deref</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">alloc</span>::{<span class="ident">handle_alloc_error</span>, <span class="ident">System</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::<span class="ident">Borrow</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="doccomment">/// Bucket of `Asc` to allocate/deallocate memory for reference count and value at once.</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">struct</span> <span class="ident">Bucket</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">count</span>: <span class="ident">AtomicUsize</span>,
<span class="ident">size</span>: <span class="ident">usize</span>,
<span class="ident">val</span>: <span class="ident">T</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">val</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">align_of</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>(), <span class="ident">align_of</span>::<span class="op"><</span><span class="self">Self</span><span class="op">></span>());
<span class="self">Self</span> {
<span class="ident">count</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">1</span>),
<span class="ident">size</span>: <span class="ident">size_of</span>::<span class="op"><</span><span class="self">Self</span><span class="op">></span>(),
<span class="ident">val</span>,
}
}
}
<span class="kw">impl</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">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="ident">val</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">AtomicUsize</span> {
<span class="kw">let</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="ident">val</span>;
<span class="kw">let</span> <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">cast</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">sub</span>(<span class="number">1</span>);
<span class="kw">let</span> <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">cast</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">sub</span>(<span class="number">1</span>);
<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">ptr</span>
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">size</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">cast</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">sub</span>(<span class="number">1</span>);
<span class="kw-2">*</span><span class="ident">ptr</span>
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">dealloc_ptr</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="op">></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span> {
<span class="kw">let</span> <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">cast</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">sub</span>(<span class="number">1</span>);
<span class="kw">let</span> <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">cast</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">sub</span>(<span class="number">1</span>);
<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>
}
}
<span class="doccomment">/// A thread-safe strong reference-counting pointer. 'Asc' stands for 'Atomic Strong Counted.'</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It behaves like `std::Sync::Arc` except for that this treats only strong pointer; i.e. `Asc`</span>
<span class="doccomment">/// gives up weak pointer for the performance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The inherent methods of `Asc` are all associated funcitons, which means that you have to call</span>
<span class="doccomment">/// them as e.g., `Asc::get_mut(&mut value)` instead of `value.get_mut()` . This avoids conflicts</span>
<span class="doccomment">/// with methods of the inner type `T` .</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Thread Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike to [`Sc`] , `Asc` uses atomic operations for its reference counting. This means that it</span>
<span class="doccomment">/// is thread-safe. The disadvangate is that atomic operations are more expensive than ordinary</span>
<span class="doccomment">/// memory access.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Sc`]: struct.Sc.html</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span> <span class="op">=</span> <span class="ident">System</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">alloc</span>: <span class="ident">A</span>,
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span>,
<span class="ident">A</span>: <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">GlobalAlloc</span>,
{
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span>,
<span class="ident">A</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">GlobalAlloc</span>,
{
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">Bucket</span>::<span class="ident">count</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span>).<span class="ident">fetch_sub</span>(<span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">Release</span>);
<span class="kw">if</span> <span class="ident">count</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span>
<span class="ident">Layout</span>::<span class="ident">from_size_align</span>(<span class="ident">Bucket</span>::<span class="ident">size</span>(<span class="self">self</span>.<span class="ident">ptr</span>), <span class="ident">align_of</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>()).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">Bucket</span>::<span class="ident">dealloc_ptr</span>(<span class="self">self</span>.<span class="ident">ptr</span>);
<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">drop_in_place</span>();
<span class="self">self</span>.<span class="ident">alloc</span>.<span class="ident">dealloc</span>(<span class="ident">ptr</span>, <span class="ident">layout</span>);
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Default</span>,
<span class="ident">A</span>: <span class="ident">Default</span> <span class="op">+</span> <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span>::<span class="ident">new</span>(<span class="ident">T</span>::<span class="ident">default</span>(), <span class="ident">A</span>::<span class="ident">default</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">Default</span> <span class="op">+</span> <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">val</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span>::<span class="ident">new</span>(<span class="ident">val</span>, <span class="ident">A</span>::<span class="ident">default</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'_</span> [<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span>[<span class="ident">T</span>], <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Clone</span>,
<span class="ident">A</span>: <span class="ident">Default</span> <span class="op">+</span> <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">vals</span>: <span class="kw-2">&</span><span class="lifetime">'_</span> [<span class="ident">T</span>]) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">Asc</span>::<span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>::<span class="ident">from_slice_alloc</span>(<span class="ident">vals</span>, <span class="ident">A</span>::<span class="ident">default</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">GlobalAlloc</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="op">></span> <span class="self">Self</span> {
<span class="comment">// increment the count.</span>
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span>;
<span class="ident">Bucket</span>::<span class="ident">count</span>(<span class="ident">val</span>).<span class="ident">fetch_add</span>(<span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">Acquire</span>);
};
<span class="self">Self</span> {
<span class="ident">ptr</span>: <span class="self">self</span>.<span class="ident">ptr</span>,
<span class="ident">alloc</span>: <span class="self">self</span>.<span class="ident">alloc</span>.<span class="ident">clone</span>(),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="doccomment">/// Creates a new instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::alloc::System;</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let _five = Asc::new(5, System);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">alloc</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">bucket</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span> <span class="ident">Layout</span>::<span class="ident">new</span>::<span class="op"><</span><span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">alloc</span>.<span class="ident">alloc</span>(<span class="ident">layout</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">if</span> <span class="ident">ptr</span>.<span class="ident">is_null</span>() {
<span class="ident">handle_alloc_error</span>(<span class="ident">layout</span>);
}
<span class="ident">ptr</span>.<span class="ident">write</span>(<span class="ident">Bucket</span>::<span class="ident">from</span>(<span class="ident">val</span>));
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span>
};
<span class="self">Self</span> {
<span class="ident">ptr</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bucket</span>.<span class="ident">val</span>,
<span class="ident">alloc</span>,
}
}
<span class="doccomment">/// Creates a new instance of `Asc<[T], A>` .</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::alloc::System;</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let vals: [i32; 4] = [0, 1, 2, 3];</span>
<span class="doccomment">/// let sc = Asc::from_slice_alloc(&vals, System);</span>
<span class="doccomment">/// assert_eq!(&vals, &*sc);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_slice_alloc</span>(<span class="ident">vals</span>: <span class="kw-2">&</span>[<span class="ident">T</span>], <span class="ident">alloc</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span>[<span class="ident">T</span>], <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Clone</span>,
{
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span> {
<span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> <span class="ident">align_of</span>::<span class="op"><</span><span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>() <span class="op">-</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>()
<span class="op">+</span> <span class="ident">vals</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>();
<span class="ident">Layout</span>::<span class="ident">from_size_align_unchecked</span>(<span class="ident">size</span>, <span class="ident">align</span>)
};
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">alloc</span>.<span class="ident">alloc</span>(<span class="ident">layout</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">if</span> <span class="ident">ptr</span>.<span class="ident">is_null</span>() {
<span class="ident">handle_alloc_error</span>(<span class="ident">layout</span>);
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bucket</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span>;
<span class="ident">bucket</span>.<span class="ident">count</span> <span class="op">=</span> <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">1</span>);
<span class="ident">bucket</span>.<span class="ident">size</span> <span class="op">=</span> <span class="ident">layout</span>.<span class="ident">size</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bucket</span>.<span class="ident">val</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>;
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">vals</span>.<span class="ident">len</span>() {
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">vals</span>[<span class="ident">i</span>].<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">add</span>(<span class="ident">i</span>);
<span class="ident">ptr</span>.<span class="ident">write</span>(<span class="ident">v</span>);
}
<span class="kw">let</span> <span class="ident">slice_ref</span> <span class="op">=</span> <span class="ident">core</span>::<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">ptr</span>, <span class="ident">vals</span>.<span class="ident">len</span>());
<span class="ident">Asc</span>::<span class="op"><</span>[<span class="ident">T</span>], <span class="ident">A</span><span class="op">></span> {
<span class="ident">ptr</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">slice_ref</span>,
<span class="ident">alloc</span>,
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">dyn</span> <span class="ident">Any</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="doccomment">/// Creates `Asc<dyn Any>` instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::alloc::System;</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let _five = Asc::new_any(5, System);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_any</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">alloc</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Any</span>,
{
<span class="kw">let</span> <span class="ident">bucket</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span> <span class="ident">Layout</span>::<span class="ident">new</span>::<span class="op"><</span><span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">alloc</span>.<span class="ident">alloc</span>(<span class="ident">layout</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Bucket</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">if</span> <span class="ident">ptr</span>.<span class="ident">is_null</span>() {
<span class="ident">handle_alloc_error</span>(<span class="ident">layout</span>);
}
<span class="ident">ptr</span>.<span class="ident">write</span>(<span class="ident">Bucket</span>::<span class="ident">from</span>(<span class="ident">val</span>));
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span>
};
<span class="self">Self</span> {
<span class="ident">ptr</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bucket</span>.<span class="ident">val</span>,
<span class="ident">alloc</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</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="ident">Asc</span><span class="op"><</span><span class="ident">T</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="op">+</span> <span class="ident">GlobalAlloc</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="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:p}"</span>, <span class="self">self</span>.<span class="ident">ptr</span>);
<span class="kw">let</span> <span class="ident">alloc</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="self">self</span>.<span class="ident">alloc</span>);
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Asc"</span>)
.<span class="ident">field</span>(<span class="string">"ptr"</span>, <span class="kw-2">&</span><span class="ident">ptr</span>)
.<span class="ident">field</span>(<span class="string">"alloc"</span>, <span class="kw-2">&</span><span class="ident">alloc</span>)
.<span class="ident">finish</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">PartialEq</span>,
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">let</span> <span class="ident">this</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>();
<span class="kw">let</span> <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">borrow</span>();
<span class="ident">this</span>.<span class="ident">eq</span>(<span class="ident">other</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Eq</span>,
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">PartialOrd</span>,
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">this</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>();
<span class="kw">let</span> <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">borrow</span>();
<span class="ident">this</span>.<span class="ident">partial_cmp</span>(<span class="ident">other</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Ord</span>,
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
<span class="kw">let</span> <span class="ident">this</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>();
<span class="kw">let</span> <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">borrow</span>();
<span class="ident">this</span>.<span class="ident">cmp</span>(<span class="ident">other</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Hash</span>,
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">hasher</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>)
<span class="kw">where</span>
<span class="ident">H</span>: <span class="ident">Hasher</span>,
{
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>();
<span class="ident">inner</span>.<span class="ident">hash</span>(<span class="ident">hasher</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Display</span>,
<span class="ident">A</span>: <span class="ident">GlobalAlloc</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="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">deref</span>();
<span class="ident">fmt</span>::<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="ident">inner</span>, <span class="ident">f</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">deref</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Borrow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">deref</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Target</span> {
<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="doccomment">/// Consumes `this`, returning `Asc<dyn Any, A>`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let sc: Asc<i32> = Asc::from(6);</span>
<span class="doccomment">/// let any = Asc::to_any(sc);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_any</span>(<span class="ident">this</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">dyn</span> <span class="ident">Any</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Any</span>,
{
<span class="kw">let</span> (<span class="ident">ptr</span>, <span class="ident">alloc</span>) <span class="op">=</span> <span class="self">Self</span>::<span class="ident">decouple</span>(<span class="ident">this</span>);
<span class="ident">Asc</span>::<span class="op"><</span><span class="ident">dyn</span> <span class="ident">Any</span>, <span class="ident">A</span><span class="op">></span> { <span class="ident">ptr</span>, <span class="ident">alloc</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">A</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="doccomment">/// Provides a raw pointer to the data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The counts are not affected in any way and the `Asc` is not consumed. The pointer is valid</span>
<span class="doccomment">/// for as long as another `Asc` instance is pointing to the address.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let x: Asc<String> = Asc::from(String::from("Hello"));</span>
<span class="doccomment">/// let x_ptr = Asc::as_ptr(&x);</span>
<span class="doccomment">/// assert_eq!("Hello", unsafe { &*x_ptr });</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="ident">this</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> {
<span class="ident">this</span>.<span class="ident">ptr</span>
}
<span class="doccomment">/// Returns the number of `Asc` pointers pointing to the same address.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five: Asc<i32> = Asc::from(5);</span>
<span class="doccomment">/// assert_eq!(1, Asc::count(&five));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let _also_five = five.clone();</span>
<span class="doccomment">/// assert_eq!(2, Asc::count(&five));</span>
<span class="doccomment">/// assert_eq!(2, Asc::count(&_also_five));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// drop(five);</span>
<span class="doccomment">/// assert_eq!(1, Asc::count(&_also_five));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="ident">this</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">this</span>.<span class="ident">ptr</span>;
<span class="ident">Bucket</span>::<span class="ident">count</span>(<span class="ident">val</span>).<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>)
}
}
<span class="doccomment">/// Returns a mutable reference into the given `Asc` , if no other `Asc` instance is pointing to</span>
<span class="doccomment">/// the same address; otherwise returns `None` .</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See also [`make_mut`] , which will `clone` the inner value when some other `Asc` instances</span>
<span class="doccomment">/// are.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`make_mut`]: #method.make_mut</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut x: Asc<i32> = Asc::from(3);</span>
<span class="doccomment">/// assert_eq!(3, *x);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// *Asc::get_mut(&mut x).unwrap() = 4;</span>
<span class="doccomment">/// assert_eq!(4, *x);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let _y = x.clone();</span>
<span class="doccomment">/// let n = Asc::get_mut(&mut x);</span>
<span class="doccomment">/// assert!(n.is_none());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="ident">this</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">Self</span>::<span class="ident">count</span>(<span class="ident">this</span>) <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
<span class="prelude-val">Some</span>(<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">this</span>.<span class="ident">ptr</span> })
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="doccomment">/// Returns `true` if the two `Asc` instances point to the same address, or `false` .</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five: Asc<i32> = Asc::from(5);</span>
<span class="doccomment">/// let same_five = five.clone();</span>
<span class="doccomment">/// let other_five: Asc<i32> = Asc::from(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(true, Asc::ptr_eq(&five, &same_five));</span>
<span class="doccomment">/// assert_eq!(false, Asc::ptr_eq(&five, &other_five));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ptr_eq</span>(<span class="ident">this</span>: <span class="kw-2">&</span><span class="self">Self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="ident">Asc</span>::<span class="ident">as_ptr</span>(<span class="ident">this</span>) <span class="op">=</span><span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">as_ptr</span>(<span class="ident">other</span>)
}
<span class="doccomment">/// Consumes `this` , returning the wrapped pointer and the allocator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To avoid memory leak, the returned pointer must be converted back to an `Asc` using</span>
<span class="doccomment">/// [`from_raw_alloc`] .</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using this function and [`from_raw_alloc`] , user can create an `Asc<T: ?Sized>` instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`from_raw_alloc`]: #method.from_raw_alloc</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let asc: Asc<String> = Asc::from("Foo".to_string());</span>
<span class="doccomment">/// let (ptr, alloc) = Asc::into_raw_alloc(asc);</span>
<span class="doccomment">/// let _asc: Asc<dyn AsRef<str>> = unsafe { Asc::from_raw_alloc(ptr, alloc) };</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_raw_alloc</span>(<span class="ident">this</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> (<span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">A</span>) {
<span class="kw">let</span> (<span class="ident">ptr</span>, <span class="ident">alloc</span>) <span class="op">=</span> <span class="self">Self</span>::<span class="ident">decouple</span>(<span class="ident">this</span>);
(<span class="ident">ptr</span>, <span class="ident">alloc</span>)
}
<span class="doccomment">/// Constructs a new instance from a raw pointer and allocator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The raw pointer must have been previously returned by a call to [`into_raw_alloc`] .</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using this function and [`into_raw_alloc`] , user can create an `Asc<T: ?Sized>` instance.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It may lead to memory unsafety to use improperly, even if the returned value will never be</span>
<span class="doccomment">/// accessed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`into_raw_alloc`]: #method.into_raw_alloc</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let asc: Asc<String> = Asc::from("Foo".to_string());</span>
<span class="doccomment">/// let (ptr, alloc) = Asc::into_raw_alloc(asc);</span>
<span class="doccomment">/// let _asc: Asc<dyn AsRef<str>> = unsafe { Asc::from_raw_alloc(ptr, alloc) };</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw_alloc</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">alloc</span>: <span class="ident">A</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">ptr</span>: <span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">alloc</span>,
}
}
<span class="kw">fn</span> <span class="ident">decouple</span>(<span class="ident">this</span>: <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> (<span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">A</span>) {
<span class="kw">let</span> <span class="ident">alloc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">alloc</span> <span class="op">=</span> <span class="ident">MaybeUninit</span>::<span class="op"><</span><span class="ident">A</span><span class="op">></span>::<span class="ident">uninit</span>();
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">alloc</span>.<span class="ident">as_mut_ptr</span>();
<span class="ident">ptr</span>.<span class="ident">copy_from_nonoverlapping</span>(<span class="kw-2">&</span><span class="ident">this</span>.<span class="ident">alloc</span>, <span class="number">1</span>);
<span class="ident">alloc</span>.<span class="ident">assume_init</span>()
};
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> (<span class="ident">this</span>.<span class="ident">ptr</span>, <span class="ident">alloc</span>);
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">this</span>);
<span class="ident">ret</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span>, <span class="ident">A</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="doccomment">/// Makes a mutable reference into the given `Asc` .</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If another `Asc` instance is pointing to the same address, `make_mut` will `clone` the inner</span>
<span class="doccomment">/// value to a new allocation to ensure unique ownership.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See also [`get_mut`] , which will fail rather than cloning.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`get_mut`]: #method.get_mut</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut data: Asc<i32> = Asc::from(5);</span>
<span class="doccomment">/// assert_eq!(5, *data);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// *Asc::make_mut(&mut data) += 1; // Won't clone anything.</span>
<span class="doccomment">/// assert_eq!(6, *data);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut data2 = data.clone(); // Won't clone the inner data.</span>
<span class="doccomment">/// *Asc::make_mut(&mut data) += 1; // Clones inner data.</span>
<span class="doccomment">/// assert_eq!(7, *data);</span>
<span class="doccomment">/// assert_eq!(6, *data2);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">make_mut</span>(<span class="ident">this</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">if</span> <span class="self">Self</span>::<span class="ident">count</span>(<span class="ident">this</span>) <span class="op">!</span><span class="op">=</span> <span class="number">1</span> {
<span class="kw">let</span> <span class="ident">val</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="ident">this</span>.<span class="ident">deref</span>();
<span class="kw-2">*</span><span class="ident">this</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">new</span>(<span class="ident">val</span>.<span class="ident">clone</span>(), <span class="ident">this</span>.<span class="ident">alloc</span>.<span class="ident">clone</span>());
}
<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">this</span>.<span class="ident">ptr</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">Asc</span><span class="op"><</span><span class="ident">dyn</span> <span class="ident">Any</span>, <span class="ident">A</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">GlobalAlloc</span>,
{
<span class="doccomment">/// Attempts to downcast the `Asc<dyn Any, A>` to a concrete type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::alloc::System;</span>
<span class="doccomment">/// use std::any::Any;</span>
<span class="doccomment">/// use counting_pointer::Asc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let sc = Asc::new_any(8 as i32, System);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let success = Asc::downcast::<i32>(sc.clone()).unwrap();</span>
<span class="doccomment">/// assert_eq!(8, *success);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let fail = Asc::downcast::<String>(sc.clone());</span>
<span class="doccomment">/// assert_eq!(true, fail.is_err());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">downcast</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Any</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Asc</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span>, <span class="self">Self</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">val</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">dyn</span> <span class="ident">Any</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span> };
<span class="kw">match</span> <span class="ident">val</span>.<span class="ident">downcast_mut</span>() {
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="self">self</span>),
<span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">alloc</span>) <span class="op">=</span> <span class="self">Self</span>::<span class="ident">decouple</span>(<span class="self">self</span>);
<span class="prelude-val">Ok</span>(<span class="ident">Asc</span>::<span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span><span class="op">></span> {
<span class="ident">ptr</span>: <span class="ident">t</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">alloc</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="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">gharial</span>::{<span class="ident">GAlloc</span>, <span class="ident">GBox</span>};
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">new</span>() {
<span class="kw">let</span> <span class="ident">five</span> <span class="op">=</span> <span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">_five</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">new</span>(<span class="ident">five</span>, <span class="ident">GAlloc</span>::<span class="ident">default</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>() {
<span class="kw">let</span> <span class="ident">five</span> <span class="op">=</span> <span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">five</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">new</span>(<span class="ident">five</span>, <span class="ident">GAlloc</span>::<span class="ident">default</span>());
<span class="kw">let</span> <span class="ident">_cloned</span> <span class="op">=</span> <span class="ident">five</span>.<span class="ident">clone</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">make_mut</span>() {
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">new</span>(<span class="ident">inner</span>, <span class="ident">GAlloc</span>::<span class="ident">default</span>());
{
<span class="kw">let</span> <span class="ident">_mr</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">make_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">data</span>);
}
<span class="kw">let</span> <span class="ident">_data2</span> <span class="op">=</span> <span class="ident">data</span>.<span class="ident">clone</span>();
{
<span class="kw">let</span> <span class="ident">_mr</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">make_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">data</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">downcast</span>() {
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">8</span>);
<span class="kw">let</span> <span class="ident">sc</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">new_any</span>(<span class="ident">inner</span>, <span class="ident">GAlloc</span>::<span class="ident">default</span>());
<span class="kw">let</span> <span class="ident">ok</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">downcast</span>::<span class="op"><</span><span class="ident">GBox</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span><span class="op">></span>(<span class="ident">sc</span>.<span class="ident">clone</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="bool-val">true</span>, <span class="ident">ok</span>.<span class="ident">is_ok</span>());
<span class="kw">let</span> <span class="ident">fail</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">downcast</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(<span class="ident">sc</span>.<span class="ident">clone</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="bool-val">true</span>, <span class="ident">fail</span>.<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">to_any</span>() {
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">6</span>);
<span class="kw">let</span> <span class="ident">sc</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">new</span>(<span class="ident">inner</span>, <span class="ident">GAlloc</span>::<span class="ident">default</span>());
<span class="kw">let</span> <span class="ident">_any</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">to_any</span>(<span class="ident">sc</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">from_slice_alloc</span>() {
<span class="kw">let</span> <span class="ident">inners</span>: [<span class="ident">GBox</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span>; <span class="number">2</span>] <span class="op">=</span> [<span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">6</span>), <span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">4</span>)];
<span class="kw">let</span> <span class="ident">_sc</span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">from_slice_alloc</span>(<span class="kw-2">&</span><span class="ident">inners</span>, <span class="ident">GAlloc</span>::<span class="ident">default</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">raw_alloc</span>() {
<span class="kw">let</span> <span class="ident">asc</span>: <span class="ident">Asc</span><span class="op"><</span><span class="ident">GBox</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span><span class="op">></span> <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">from</span>(<span class="ident">GBox</span>::<span class="ident">from</span>(<span class="number">0</span>));
<span class="kw">let</span> (<span class="ident">ptr</span>, <span class="ident">alloc</span>) <span class="op">=</span> <span class="ident">Asc</span>::<span class="ident">into_raw_alloc</span>(<span class="ident">asc</span>);
<span class="kw">let</span> <span class="ident">_sc</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Asc</span>::<span class="ident">from_raw_alloc</span>(<span class="ident">ptr</span>, <span class="ident">alloc</span>) };
}
}
</pre></div>
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