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</pre><pre class="rust ">
<span class="doccomment">//!</span>
<span class="doccomment">//! The **nodrop** crate has the following cargo feature flags:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - `std`</span>
<span class="doccomment">//! - Optional, enabled by default</span>
<span class="doccomment">//! - Use libstd</span>
<span class="doccomment">//! - `use_needs_drop`</span>
<span class="doccomment">//! - Optional</span>
<span class="doccomment">//! - Requires Rust 1.21</span>
<span class="doccomment">//! - Use `needs_drop` to skip overwriting if not necessary</span>
<span class="doccomment">//! - `use_union`</span>
<span class="doccomment">//! - Optional</span>
<span class="doccomment">//! - Requires nightly channel</span>
<span class="doccomment">//! - Using untagged union, finally we have an implementation of `NoDrop` without hacks,</span>
<span class="doccomment">//! for example the fact that `NoDrop<T>` never has a destructor anymore.</span>
<span class="doccomment">//!</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">test</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">any</span>(<span class="ident">test</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="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_union"</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">nodrop_union</span> <span class="kw">as</span> <span class="ident">imp</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">imp</span>::<span class="ident">NoDrop</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">"use_union"</span>))]</span>
<span class="kw">mod</span> <span class="ident">imp</span> {
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::{<span class="ident">Deref</span>, <span class="ident">DerefMut</span>};
<span class="doccomment">/// repr(u8) - Make sure the non-nullable pointer optimization does not occur!</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">u8</span>)]</span>
<span class="kw">enum</span> <span class="ident">Flag</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Alive</span>(<span class="ident">T</span>),
<span class="comment">// Dummy u8 field below, again to beat the enum layout opt</span>
<span class="ident">Dropped</span>(<span class="ident">u8</span>),
}
<span class="doccomment">/// A type holding **T** that will not call its destructor on drop</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">NoDrop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">Flag</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>);
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">NoDrop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Create a new **NoDrop**.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">NoDrop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">NoDrop</span>(<span class="ident">Flag</span>::<span class="ident">Alive</span>(<span class="ident">value</span>))
}
<span class="doccomment">/// Extract the inner value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Once extracted, the value can of course drop again.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>)
};
<span class="comment">// skip Drop, so we don't even have to overwrite</span>
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>);
<span class="ident">inner</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">"use_needs_drop"</span>))]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">needs_drop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">bool</span> {
<span class="bool-val">true</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"use_needs_drop"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">needs_drop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> {
::<span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">needs_drop</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">NoDrop</span><span class="op"><</span><span class="ident">T</span><span class="op">></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">if</span> <span class="ident">needs_drop</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() {
<span class="comment">// inhibit drop</span>
<span class="kw">unsafe</span> {
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="number">0</span>, <span class="ident">Flag</span>::<span class="ident">Dropped</span>(<span class="number">0</span>));
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">NoDrop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="comment">// Use type invariant, always Flag::Alive.</span>
<span class="attribute">#[<span class="ident">inline</span>]</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="kw-2">&</span><span class="ident">T</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="number">0</span> {
<span class="ident">Flag</span>::<span class="ident">Alive</span>(<span class="kw-2">ref</span> <span class="ident">inner</span>) <span class="op">=></span> <span class="ident">inner</span>,
<span class="kw">_</span> <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">debug_assert_unreachable</span>() }
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">DerefMut</span> <span class="kw">for</span> <span class="ident">NoDrop</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="comment">// Use type invariant, always Flag::Alive.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="number">0</span> {
<span class="ident">Flag</span>::<span class="ident">Alive</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">inner</span>) <span class="op">=></span> <span class="ident">inner</span>,
<span class="kw">_</span> <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">debug_assert_unreachable</span>() }
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_no_nonnullable_opt</span>() {
<span class="comment">// Make sure `Flag` does not apply the non-nullable pointer optimization</span>
<span class="comment">// as Option would do.</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Flag</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">i32</span><span class="op">>></span>() <span class="op">></span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="kw-2">&</span><span class="ident">i32</span><span class="op">></span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Flag</span><span class="op"><</span><span class="ident">Vec</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">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>());
}
<span class="comment">// copying this code saves us microcrate deps</span>
<span class="attribute">#[<span class="ident">inline</span>]</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">"Reached unreachable section: this is a bug!"</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="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="ident">NoDrop</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_drop</span>() {
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">Cell</span>;
<span class="kw">let</span> <span class="ident">flag</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">Cell</span>::<span class="ident">new</span>(<span class="number">0</span>);
<span class="kw">struct</span> <span class="ident">Bump</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span>);
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Bump</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></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">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>();
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">set</span>(<span class="ident">n</span> <span class="op">+</span> <span class="number">1</span>);
}
}
{
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">NoDrop</span>::<span class="ident">new</span>([<span class="ident">Bump</span>(<span class="ident">flag</span>), <span class="ident">Bump</span>(<span class="ident">flag</span>)]);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">flag</span>.<span class="ident">get</span>(), <span class="number">0</span>);
<span class="comment">// test something with the nullable pointer optimization</span>
<span class="ident">flag</span>.<span class="ident">set</span>(<span class="number">0</span>);
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">array</span> <span class="op">=</span> <span class="ident">NoDrop</span>::<span class="ident">new</span>(<span class="ident">Vec</span>::<span class="ident">new</span>());
<span class="ident">array</span>.<span class="ident">push</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Bump</span>(<span class="ident">flag</span>)]);
<span class="ident">array</span>.<span class="ident">push</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Bump</span>(<span class="ident">flag</span>), <span class="ident">Bump</span>(<span class="ident">flag</span>)]);
<span class="ident">array</span>.<span class="ident">push</span>(<span class="macro">vec</span><span class="macro">!</span>[]);
<span class="ident">array</span>.<span class="ident">push</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Bump</span>(<span class="ident">flag</span>)]);
<span class="ident">drop</span>(<span class="ident">array</span>.<span class="ident">pop</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">flag</span>.<span class="ident">get</span>(), <span class="number">1</span>);
<span class="ident">drop</span>(<span class="ident">array</span>.<span class="ident">pop</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">flag</span>.<span class="ident">get</span>(), <span class="number">1</span>);
<span class="ident">drop</span>(<span class="ident">array</span>.<span class="ident">pop</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">flag</span>.<span class="ident">get</span>(), <span class="number">3</span>);
}
<span class="comment">// last one didn't drop.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">flag</span>.<span class="ident">get</span>(), <span class="number">3</span>);
<span class="ident">flag</span>.<span class="ident">set</span>(<span class="number">0</span>);
{
<span class="kw">let</span> <span class="ident">array</span> <span class="op">=</span> <span class="ident">NoDrop</span>::<span class="ident">new</span>(<span class="ident">Bump</span>(<span class="ident">flag</span>));
<span class="ident">array</span>.<span class="ident">into_inner</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">flag</span>.<span class="ident">get</span>(), <span class="number">1</span>);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">flag</span>.<span class="ident">get</span>(), <span class="number">1</span>);
}
}
</pre>
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