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<p class='location'>Trait CoerceUnsized</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-CoerceUnsized%3CNonZero%3CU%3E%3E">NonZero<T></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>ops</a></p><script>window.sidebarCurrent = {name: 'CoerceUnsized', 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'>std</a>::<wbr><a href='index.html'>ops</a>::<wbr><a class="trait" href=''>CoerceUnsized</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
</a>
</span><a class='srclink' href='../../src/core/ops/unsize.rs.html#46-48' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'><div class="docblock attributes">#[lang = "coerce_unsized"]
</div>pub trait CoerceUnsized<T> { }</pre><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>coerce_unsized </code><a href="https://github.com/rust-lang/rust/issues/27732">#27732</a>)</div></div><div class='docblock'><p>Trait that indicates that this is a pointer or a wrapper for one,
where unsizing can be performed on the pointee.</p>
<p>See the <a href="https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md">DST coercion RfC</a> and <a href="../../nomicon/coercions.html">the nomicon entry on coercion</a>
for more details.</p>
<p>For builtin pointer types, pointers to <code>T</code> will coerce to pointers to <code>U</code> if <code>T: Unsize<U></code>
by converting from a thin pointer to a fat pointer.</p>
<p>For custom types, the coercion here works by coercing <code>Foo<T></code> to <code>Foo<U></code>
provided an impl of <code>CoerceUnsized<Foo<U>> for Foo<T></code> exists.
Such an impl can only be written if <code>Foo<T></code> has only a single non-phantomdata
field involving <code>T</code>. If the type of that field is <code>Bar<T></code>, an implementation
of <code>CoerceUnsized<Bar<U>> for Bar<T></code> must exist. The coercion will work by
coercing the <code>Bar<T></code> field into <code>Bar<U></code> and filling in the rest of the fields
from <code>Foo<T></code> to create a <code>Foo<U></code>. This will effectively drill down to a pointer
field and coerce that.</p>
<p>Generally, for smart pointers you will implement
<code>CoerceUnsized<Ptr<U>> for Ptr<T> where T: Unsize<U>, U: ?Sized</code>, with an
optional <code>?Sized</code> bound on <code>T</code> itself. For wrapper types that directly embed <code>T</code>
like <code>Cell<T></code> and <code>RefCell<T></code>, you
can directly implement <code>CoerceUnsized<Wrap<U>> for Wrap<T> where T: CoerceUnsized<U></code>.
This will let coercions of types like <code>Cell<Box<T>></code> work.</p>
<p><a href="../marker/trait.Unsize.html"><code>Unsize</code></a> is used to mark types which can be coerced to DSTs if behind
pointers. It is implemented automatically by the compiler.</p>
</div>
<h2 id='foreign-impls' class='small-section-header'>
Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
</h2>
<h3 id='impl-CoerceUnsized%3CNonZero%3CU%3E%3E' class='impl'><span class='in-band'><code>impl<T, U> <a class="trait" href="../../std/ops/trait.CoerceUnsized.html" title="trait std::ops::CoerceUnsized">CoerceUnsized</a><<a class="struct" href="../../core/nonzero/struct.NonZero.html" title="struct core::nonzero::NonZero">NonZero</a><U>> for <a class="struct" href="../../core/nonzero/struct.NonZero.html" title="struct core::nonzero::NonZero">NonZero</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/nonzero/trait.Zeroable.html" title="trait core::nonzero::Zeroable">Zeroable</a> + <a class="trait" href="../../std/ops/trait.CoerceUnsized.html" title="trait std::ops::CoerceUnsized">CoerceUnsized</a><U>,<br> U: <a class="trait" href="../../core/nonzero/trait.Zeroable.html" title="trait core::nonzero::Zeroable">Zeroable</a>, </span></code><a href='#impl-CoerceUnsized%3CNonZero%3CU%3E%3E' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/nonzero.rs.html#94' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'></div></span>
<h2 id='implementors' class='small-section-header'>
Implementors<a href='#implementors' class='anchor'></a>
</h2>
<ul class='item-list' id='implementors-list'>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#79' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="primitive" href="../primitive.pointer.html">*const U</a>> for <a class="primitive" href="../primitive.pointer.html">*const T</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#68' title='goto source code'>[src]</a></div><code>impl<'a, T, U> CoerceUnsized<<a class="primitive" href="../primitive.pointer.html">*const U</a>> for <a class="primitive" href="../primitive.reference.html">&'a </a>T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#1148' title='goto source code'>[src]</a></div><code>impl<'b, T, U> CoerceUnsized<<a class="struct" href="../../std/cell/struct.RefMut.html" title="struct std::cell::RefMut">RefMut</a><'b, U>> for <a class="struct" href="../../std/cell/struct.RefMut.html" title="struct std::cell::RefMut">RefMut</a><'b, T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ptr.rs.html#2577' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/ptr/struct.NonNull.html" title="struct std::ptr::NonNull">NonNull</a><U>> for <a class="struct" href="../../std/ptr/struct.NonNull.html" title="struct std::ptr::NonNull">NonNull</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#1047' title='goto source code'>[src]</a></div><code>impl<'b, T, U> CoerceUnsized<<a class="struct" href="../../std/cell/struct.Ref.html" title="struct std::cell::Ref">Ref</a><'b, U>> for <a class="struct" href="../../std/cell/struct.Ref.html" title="struct std::cell::Ref">Ref</a><'b, T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ptr.rs.html#2433' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/ptr/struct.Unique.html" title="struct std::ptr::Unique">Unique</a><U>> for <a class="struct" href="../../std/ptr/struct.Unique.html" title="struct std::ptr::Unique">Unique</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#61' title='goto source code'>[src]</a></div><code>impl<'a, T, U> CoerceUnsized<<a class="primitive" href="../primitive.pointer.html">*const U</a>> for <a class="primitive" href="../primitive.reference.html">&'a mut </a>T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#72' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="primitive" href="../primitive.pointer.html">*mut U</a>> for <a class="primitive" href="../primitive.pointer.html">*mut T</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#936' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/cell/struct.RefCell.html" title="struct std::cell::RefCell">RefCell</a><U>> for <a class="struct" href="../../std/cell/struct.RefCell.html" title="struct std::cell::RefCell">RefCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/ops/trait.CoerceUnsized.html" title="trait std::ops::CoerceUnsized">CoerceUnsized</a><U>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#65' title='goto source code'>[src]</a></div><code>impl<'a, 'b, T, U> CoerceUnsized<<a class="primitive" href="../primitive.reference.html">&'a </a>U> for <a class="primitive" href="../primitive.reference.html">&'b </a>T <span class="where fmt-newline">where<br> 'b: 'a,<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#55' title='goto source code'>[src]</a></div><code>impl<'a, 'b, T, U> CoerceUnsized<<a class="primitive" href="../primitive.reference.html">&'a </a>U> for <a class="primitive" href="../primitive.reference.html">&'b mut </a>T <span class="where fmt-newline">where<br> 'b: 'a,<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#1279' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/cell/struct.UnsafeCell.html" title="struct std::cell::UnsafeCell">UnsafeCell</a><U>> for <a class="struct" href="../../std/cell/struct.UnsafeCell.html" title="struct std::cell::UnsafeCell">UnsafeCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/ops/trait.CoerceUnsized.html" title="trait std::ops::CoerceUnsized">CoerceUnsized</a><U>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#478' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/cell/struct.Cell.html" title="struct std::cell::Cell">Cell</a><U>> for <a class="struct" href="../../std/cell/struct.Cell.html" title="struct std::cell::Cell">Cell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/ops/trait.CoerceUnsized.html" title="trait std::ops::CoerceUnsized">CoerceUnsized</a><U>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#52' title='goto source code'>[src]</a></div><code>impl<'a, T, U> CoerceUnsized<<a class="primitive" href="../primitive.reference.html">&'a mut </a>U> for <a class="primitive" href="../primitive.reference.html">&'a mut </a>T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#58' title='goto source code'>[src]</a></div><code>impl<'a, T, U> CoerceUnsized<<a class="primitive" href="../primitive.pointer.html">*mut U</a>> for <a class="primitive" href="../primitive.reference.html">&'a mut </a>T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/core/ops/unsize.rs.html#75' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="primitive" href="../primitive.pointer.html">*const U</a>> for <a class="primitive" href="../primitive.pointer.html">*mut T</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/alloc/arc.rs.html#246' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/sync/struct.Weak.html" title="struct std::sync::Weak">Weak</a><U>> for std::sync::<a class="struct" href="../../std/sync/struct.Weak.html" title="struct std::sync::Weak">Weak</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/alloc/rc.rs.html#1172' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/rc/struct.Weak.html" title="struct std::rc::Weak">Weak</a><U>> for std::rc::<a class="struct" href="../../std/rc/struct.Weak.html" title="struct std::rc::Weak">Weak</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/alloc/boxed.rs.html#813' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><U>> for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/alloc/rc.rs.html#295' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/rc/struct.Rc.html" title="struct std::rc::Rc">Rc</a><U>> for <a class="struct" href="../../std/rc/struct.Rc.html" title="struct std::rc::Rc">Rc</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../src/alloc/arc.rs.html#210' title='goto source code'>[src]</a></div><code>impl<T, U> CoerceUnsized<<a class="struct" href="../../std/sync/struct.Arc.html" title="struct std::sync::Arc">Arc</a><U>> for <a class="struct" href="../../std/sync/struct.Arc.html" title="struct std::sync::Arc">Arc</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/marker/trait.Unsize.html" title="trait std::marker::Unsize">Unsize</a><U> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> U: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
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Prefix searches with a type followed by a colon (e.g.
<code>fn:</code>) to restrict the search to a given type.
</p>
<p>
Accepted types are: <code>fn</code>, <code>mod</code>,
<code>struct</code>, <code>enum</code>,
<code>trait</code>, <code>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
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