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<p class='location'><a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>ptr</a></p><script>window.sidebarCurrent = {name: 'Unique', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content struct">
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<h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>ptr</a>::<wbr><a class='struct' href=''>Unique</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a id='src-12879' class='srclink' href='https://doc.rust-lang.org/nightly/core/ptr/struct.Unique.html?gotosrc=12879' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Unique<T> <span class='where'>where T: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span> {
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// some fields omitted
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}</pre><div class='stability'><em class='stab unstable'>Unstable (<code>unique</code>)<p>: needs an RFC to flesh out design</p>
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</em></div><div class='docblock'><p>A wrapper around a raw non-null <code>*mut T</code> that indicates that the possessor
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of this wrapper owns the referent. This in turn implies that the
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<code>Unique<T></code> is <code>Send</code>/<code>Sync</code> if <code>T</code> is <code>Send</code>/<code>Sync</code>, unlike a raw
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<code>*mut T</code> (which conveys no particular ownership semantics). It
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also implies that the referent of the pointer should not be
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modified without a unique path to the <code>Unique</code> reference. Useful
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for building abstractions like <code>Vec<T></code> or <code>Box<T></code>, which
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internally use raw pointers to manage the memory that they own.</p>
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</div><h2 id='methods'>Methods</h2><h3 class='impl'><code>impl<T> <a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><T> <span class='where'>where T: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'><h4 id='method.new' class='method'><code>const unsafe fn <a href='#method.new' class='fnname'>new</a>(ptr: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.pointer.html'>*mut T</a>) -> <a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><T></code></h4>
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<div class='stability'><em class='stab unstable'>Unstable (<code>unique</code>)</em></div><div class='docblock'><p>Creates a new <code>Unique</code>.</p>
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<h1 id='safety' class='section-header'><a href='#safety'>Safety</a></h1>
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<p><code>ptr</code> must be non-null.</p>
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</div><h4 id='method.get' class='method'><code>unsafe fn <a href='#method.get' class='fnname'>get</a>(&self) -> &T</code></h4>
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<div class='stability'><em class='stab unstable'>Unstable (<code>unique</code>)</em></div><div class='docblock'><p>Dereferences the content.</p>
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</div><h4 id='method.get_mut' class='method'><code>unsafe fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&mut self) -> &mut T</code></h4>
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<div class='stability'><em class='stab unstable'>Unstable (<code>unique</code>)</em></div><div class='docblock'><p>Mutably dereferences the content.</p>
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</div></div><h2 id='deref-methods'>Methods from <a class='trait' href='../../../bitflags/__core/ops/trait.Deref.html' title='bitflags::__core::ops::Deref'>Deref</a><Target=<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.pointer.html'>*mut T</a>></h2><div class='impl-items'><h4 id='method.is_null' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.is_null' class='fnname'>is_null</a>(self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
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<div class='docblock'><p>Returns true if the pointer is null.</p>
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<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> [<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
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<span class='kw'>let</span> <span class='ident'>ptr</span>: <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>u32</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>as_mut_ptr</span>();
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<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>ptr</span>.<span class='ident'>is_null</span>());</pre>
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</div><h4 id='method.as_ref' class='method'><span class="since">1.9.0</span><code>unsafe fn <a href='#method.as_ref' class='fnname'>as_ref</a>(self) -> <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a><&'a T></code></h4>
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<div class='docblock'><p>Returns <code>None</code> if the pointer is null, or else returns a reference to
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the value wrapped in <code>Some</code>.</p>
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<h1 id='safety-1' class='section-header'><a href='#safety-1'>Safety</a></h1>
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<p>While this method and its mutable counterpart are useful for
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null-safety, it is important to note that this is still an unsafe
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operation because the returned value could be pointing to invalid
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memory.</p>
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<p>Additionally, the lifetime <code>'a</code> returned is arbitrarily chosen and does
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not necessarily reflect the actual lifetime of the data.</p>
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<h1 id='examples-1' class='section-header'><a href='#examples-1'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>let</span> <span class='ident'>val</span>: <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>u8</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='number'>10u8</span> <span class='kw'>as</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>u8</span>;
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<span class='kw'>unsafe</span> {
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<span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>val_back</span>) <span class='op'>=</span> <span class='ident'>val</span>.<span class='ident'>as_ref</span>() {
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"We got back the value: {}!"</span>, <span class='ident'>val_back</span>);
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}
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}</pre>
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</div><h4 id='method.offset' class='method'><span class="since">1.0.0</span><code>unsafe fn <a href='#method.offset' class='fnname'>offset</a>(self, count: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.isize.html'>isize</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.pointer.html'>*mut T</a></code></h4>
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<div class='docblock'><p>Calculates the offset from a pointer. <code>count</code> is in units of T; e.g. a
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<code>count</code> of 3 represents a pointer offset of <code>3 * sizeof::<T>()</code> bytes.</p>
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<h1 id='safety-2' class='section-header'><a href='#safety-2'>Safety</a></h1>
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<p>The offset must be in-bounds of the object, or one-byte-past-the-end.
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Otherwise <code>offset</code> invokes Undefined Behavior, regardless of whether
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the pointer is used.</p>
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<h1 id='examples-2' class='section-header'><a href='#examples-2'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> [<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
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<span class='kw'>let</span> <span class='ident'>ptr</span>: <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>u32</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>as_mut_ptr</span>();
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<span class='kw'>unsafe</span> {
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='op'>*</span><span class='ident'>ptr</span>.<span class='ident'>offset</span>(<span class='number'>1</span>));
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='op'>*</span><span class='ident'>ptr</span>.<span class='ident'>offset</span>(<span class='number'>2</span>));
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}</pre>
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</div><h4 id='method.as_mut' class='method'><span class="since">1.9.0</span><code>unsafe fn <a href='#method.as_mut' class='fnname'>as_mut</a>(self) -> <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a><&'a mut T></code></h4>
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<div class='docblock'><p>Returns <code>None</code> if the pointer is null, or else returns a mutable
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reference to the value wrapped in <code>Some</code>.</p>
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<h1 id='safety-3' class='section-header'><a href='#safety-3'>Safety</a></h1>
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<p>As with <code>as_ref</code>, this is unsafe because it cannot verify the validity
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of the returned pointer, nor can it ensure that the lifetime <code>'a</code>
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returned is indeed a valid lifetime for the contained data.</p>
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<h1 id='examples-3' class='section-header'><a href='#examples-3'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> [<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
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<span class='kw'>let</span> <span class='ident'>ptr</span>: <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>u32</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>as_mut_ptr</span>();</pre>
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</div></div><div class='impl-items'><h4 id='method.is_null-1' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.is_null' class='fnname'>is_null</a>(self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
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<div class='docblock'><p>Returns true if the pointer is null.</p>
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<h1 id='examples-4' class='section-header'><a href='#examples-4'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>let</span> <span class='ident'>s</span>: <span class='kw-2'>&</span><span class='ident'>str</span> <span class='op'>=</span> <span class='string'>"Follow the rabbit"</span>;
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<span class='kw'>let</span> <span class='ident'>ptr</span>: <span class='op'>*</span><span class='kw'>const</span> <span class='ident'>u8</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>as_ptr</span>();
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<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>ptr</span>.<span class='ident'>is_null</span>());</pre>
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</div><h4 id='method.as_ref-1' class='method'><span class="since">1.9.0</span><code>unsafe fn <a href='#method.as_ref' class='fnname'>as_ref</a>(self) -> <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a><&'a T></code></h4>
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<div class='docblock'><p>Returns <code>None</code> if the pointer is null, or else returns a reference to
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the value wrapped in <code>Some</code>.</p>
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<h1 id='safety-4' class='section-header'><a href='#safety-4'>Safety</a></h1>
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<p>While this method and its mutable counterpart are useful for
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null-safety, it is important to note that this is still an unsafe
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operation because the returned value could be pointing to invalid
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memory.</p>
|
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<p>Additionally, the lifetime <code>'a</code> returned is arbitrarily chosen and does
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not necessarily reflect the actual lifetime of the data.</p>
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<h1 id='examples-5' class='section-header'><a href='#examples-5'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>let</span> <span class='ident'>val</span>: <span class='op'>*</span><span class='kw'>const</span> <span class='ident'>u8</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='number'>10u8</span> <span class='kw'>as</span> <span class='op'>*</span><span class='kw'>const</span> <span class='ident'>u8</span>;
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<span class='kw'>unsafe</span> {
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<span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>val_back</span>) <span class='op'>=</span> <span class='ident'>val</span>.<span class='ident'>as_ref</span>() {
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"We got back the value: {}!"</span>, <span class='ident'>val_back</span>);
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}
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}</pre>
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</div><h4 id='method.offset-1' class='method'><span class="since">1.0.0</span><code>unsafe fn <a href='#method.offset' class='fnname'>offset</a>(self, count: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.isize.html'>isize</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.pointer.html'>*const T</a></code></h4>
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<div class='docblock'><p>Calculates the offset from a pointer. <code>count</code> is in units of T; e.g. a
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<code>count</code> of 3 represents a pointer offset of <code>3 * sizeof::<T>()</code> bytes.</p>
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<h1 id='safety-5' class='section-header'><a href='#safety-5'>Safety</a></h1>
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<p>Both the starting and resulting pointer must be either in bounds or one
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byte past the end of an allocated object. If either pointer is out of
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bounds or arithmetic overflow occurs then
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any further use of the returned value will result in undefined behavior.</p>
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<h1 id='examples-6' class='section-header'><a href='#examples-6'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>let</span> <span class='ident'>s</span>: <span class='kw-2'>&</span><span class='ident'>str</span> <span class='op'>=</span> <span class='string'>"123"</span>;
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<span class='kw'>let</span> <span class='ident'>ptr</span>: <span class='op'>*</span><span class='kw'>const</span> <span class='ident'>u8</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>as_ptr</span>();
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<span class='kw'>unsafe</span> {
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='op'>*</span><span class='ident'>ptr</span>.<span class='ident'>offset</span>(<span class='number'>1</span>) <span class='kw'>as</span> <span class='ident'>char</span>);
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='op'>*</span><span class='ident'>ptr</span>.<span class='ident'>offset</span>(<span class='number'>2</span>) <span class='kw'>as</span> <span class='ident'>char</span>);
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}</pre>
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</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><code>impl<T> <a class='trait' href='../../../bitflags/__core/fmt/trait.Pointer.html' title='bitflags::__core::fmt::Pointer'>Pointer</a> for <a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><T></code><span class="since">1.0.0</span></h3><div class='impl-items'><h4 id='method.fmt' class='method'><code>fn <a href='../../../bitflags/__core/fmt/trait.Pointer.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class='struct' href='../../../bitflags/__core/fmt/struct.Formatter.html' title='bitflags::__core::fmt::Formatter'>Formatter</a>) -> <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/fmt/struct.Error.html' title='bitflags::__core::fmt::Error'>Error</a>></code></h4>
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</div><h3 class='impl'><code>impl<T> <a class='trait' href='../../../bitflags/__core/ops/trait.Deref.html' title='bitflags::__core::ops::Deref'>Deref</a> for <a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><T> <span class='where'>where T: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'><h4 id='associatedtype.Target' class='type'><code>type <a href='../../../bitflags/__core/ops/trait.Deref.html#associatedtype.Target' class='type'>Target</a> = <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.pointer.html'>*mut T</a></code></h4>
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<div class='stability'><em class='stab unstable'>Unstable (<code>unique</code>)</em></div><h4 id='method.deref' class='method'><code>fn <a href='../../../bitflags/__core/ops/trait.Deref.html#tymethod.deref' class='fnname'>deref</a>(&self) -> &<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.pointer.html'>*mut T</a></code></h4>
|
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<div class='stability'><em class='stab unstable'>Unstable (<code>unique</code>)</em></div></div><h3 class='impl'><code>impl<T, U> <a class='trait' href='../../../bitflags/__core/ops/trait.CoerceUnsized.html' title='bitflags::__core::ops::CoerceUnsized'>CoerceUnsized</a><<a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><U>> for <a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><T> <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/marker/trait.Unsize.html' title='bitflags::__core::marker::Unsize'>Unsize</a><U> + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a>, U: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'></div><h3 class='impl'><code>impl<T> <a class='trait' href='../../../bitflags/__core/marker/trait.Sync.html' title='bitflags::__core::marker::Sync'>Sync</a> for <a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><T> <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/marker/trait.Sync.html' title='bitflags::__core::marker::Sync'>Sync</a> + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='docblock'><p><code>Unique</code> pointers are <code>Sync</code> if <code>T</code> is <code>Sync</code> because the data they
|
||
reference is unaliased. Note that this aliasing invariant is
|
||
unenforced by the type system; the abstraction using the
|
||
<code>Unique</code> must enforce it.</p>
|
||
</div><div class='impl-items'></div><h3 class='impl'><code>impl<T> <a class='trait' href='../../../bitflags/__core/marker/trait.Send.html' title='bitflags::__core::marker::Send'>Send</a> for <a class='struct' href='../../../bitflags/__core/ptr/struct.Unique.html' title='bitflags::__core::ptr::Unique'>Unique</a><T> <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/marker/trait.Send.html' title='bitflags::__core::marker::Send'>Send</a> + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='docblock'><p><code>Unique</code> pointers are <code>Send</code> if <code>T</code> is <code>Send</code> because the data they
|
||
reference is unaliased. Note that this aliasing invariant is
|
||
unenforced by the type system; the abstraction using the
|
||
<code>Unique</code> must enforce it.</p>
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