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<p class='location'>Trait Placer</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Place">Place</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.make_place">make_place</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>ops</a></p><script>window.sidebarCurrent = {name: 'Placer', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>core</a>::<wbr><a href='index.html'>ops</a>::<wbr><a class="trait" href=''>Placer</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'>
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</span><a class='srclink' href='../../src/core/ops/place.rs.html#71-78' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'>pub trait Placer<Data: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> {
type <a href='#associatedtype.Place' class="type">Place</a>: <a class="trait" href="../../core/ops/trait.InPlace.html" title="trait core::ops::InPlace">InPlace</a><Data>;
fn <a href='#tymethod.make_place' class='fnname'>make_place</a>(self) -> Self::<a class="type" href="../../core/ops/trait.Placer.html#associatedtype.Place" title="type core::ops::Placer::Place">Place</a>;
}</pre><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>placement_new_protocol </code><a href="https://github.com/rust-lang/rust/issues/27779">#27779</a>)</div></div><div class='docblock'><p>Interface to implementations of <code>PLACE <- EXPR</code>.</p>
<p><code>PLACE <- EXPR</code> effectively desugars into:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">PLACE</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">place</span> <span class="op">=</span> <span class="ident">Placer</span>::<span class="ident">make_place</span>(<span class="ident">p</span>);
<span class="kw">let</span> <span class="ident">raw_place</span> <span class="op">=</span> <span class="ident">Place</span>::<span class="ident">pointer</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">place</span>);
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">EXPR</span>;
<span class="kw">unsafe</span> {
<span class="ident">std</span>::<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">raw_place</span>, <span class="ident">value</span>);
<span class="ident">InPlace</span>::<span class="ident">finalize</span>(<span class="ident">place</span>)
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Bfeature(placement_new_protocol%2C%20box_heap)%5D%0Ause%20std%3A%3Aops%3A%3A%7BPlacer%2C%20Place%2C%20InPlace%7D%3B%0A%23%5Ballow(non_snake_case)%5D%0Afn%20main()%20%7B%0Alet%20PLACE%20%3D%20std%3A%3Aboxed%3A%3AHEAP%3B%0Alet%20EXPR%20%3D%201%3B%0Alet%20p%20%3D%20PLACE%3B%0Alet%20mut%20place%20%3D%20Placer%3A%3Amake_place(p)%3B%0Alet%20raw_place%20%3D%20Place%3A%3Apointer(%26mut%20place)%3B%0Alet%20value%20%3D%20EXPR%3B%0Aunsafe%20%7B%0A%20%20%20%20std%3A%3Aptr%3A%3Awrite(raw_place%2C%20value)%3B%0A%20%20%20%20InPlace%3A%3Afinalize(place)%0A%7D%0A%3B%20%7D%0A&version=nightly">Run</a></pre>
<p>The type of <code>PLACE <- EXPR</code> is derived from the type of <code>PLACE</code>;
if the type of <code>PLACE</code> is <code>P</code>, then the final type of the whole
expression is <code>P::Place::Owner</code> (see the <code>InPlace</code> and <code>Boxed</code>
traits).</p>
<p>Values for types implementing this trait usually are transient
intermediate values (e.g. the return value of <code>Vec::emplace_back</code>)
or <code>Copy</code>, since the <code>make_place</code> method takes <code>self</code> by value.</p>
</div>
<h2 id='associated-types' class='small-section-header'>
Associated Types<a href='#associated-types' class='anchor'></a>
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<div class='methods'>
<h3 id='associatedtype.Place' class='method'><span id='Place.t' class='invisible'><code>type <a href='#associatedtype.Place' class="type">Place</a>: <a class="trait" href="../../core/ops/trait.InPlace.html" title="trait core::ops::InPlace">InPlace</a><Data></code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>placement_new_protocol </code><a href="https://github.com/rust-lang/rust/issues/27779">#27779</a>)</div></div><div class='docblock'><p><code>Place</code> is the intermediate agent guarding the
uninitialized state for <code>Data</code>.</p>
</div></div>
<h2 id='required-methods' class='small-section-header'>
Required Methods<a href='#required-methods' class='anchor'></a>
</h2>
<div class='methods'>
<h3 id='tymethod.make_place' class='method'><span id='make_place.v' class='invisible'><code>fn <a href='#tymethod.make_place' class='fnname'>make_place</a>(self) -> Self::<a class="type" href="../../core/ops/trait.Placer.html#associatedtype.Place" title="type core::ops::Placer::Place">Place</a></code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>placement_new_protocol </code><a href="https://github.com/rust-lang/rust/issues/27779">#27779</a>)</div></div><div class='docblock'><p>Creates a fresh place from <code>self</code>.</p>
</div></div>
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Implementors<a href='#implementors' class='anchor'></a>
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