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<td> <div>Defined in header <code><stdatomic.h></code>
</div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c">C atomic_fetch_xor<span class="br0">(</span> <span class="kw4">volatile</span> A<span class="sy2">*</span> obj, M arg <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c">C atomic_fetch_xor_explicit<span class="br0">(</span> <span class="kw4">volatile</span> A<span class="sy2">*</span> obj, M arg, <a href="memory_order.html"><span class="kw910">memory_order</span></a> order <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Atomically replaces the value pointed by <code>obj</code> with the result of bitwise XOR between the old value of <code>obj</code> and <code>arg</code>, and returns the value <code>obj</code> held previously. The operation is read-modify-write operation. The first version orders memory accesses according to <span class="t-lc"><a href="memory_order.html" title="c/atomic/memory order">memory_order_seq_cst</a></span>, the second version orders memory accesses according to <code>order</code>.
</p><p>This is a <a href="../language/generic.html" title="c/language/generic">generic function</a> defined for all <a href="../language/atomic.html" title="c/language/atomic">atomic object types</a> <code>A</code>. The argument is pointer to a volatile atomic type to accept addresses of both non-volatile and <a href="../language/volatile.html" title="c/language/volatile">volatile</a> (e.g. memory-mapped I/O) atomic variables.<code>M</code> is either the non-atomic type corresponding to <code>A</code> if <code>A</code> is atomic integer type, or <span class="t-lc"><a href="../types/ptrdiff_t.html" title="c/types/ptrdiff t">ptrdiff_t</a></span> if <code>A</code> is atomic pointer type.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="atomic_fetch_xor.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="atomic_fetch_xor.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="atomic_fetch_xor.html#References"><span class="tocnumber">3</span> <span class="toctext">References</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="atomic_fetch_xor.html#See_also"><span class="tocnumber">4</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/atomic/atomic_fetch_xor&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> obj
</td>
<td> -
</td>
<td> pointer to the atomic object to modify
</td></tr>
<tr class="t-par">
<td> arg
</td>
<td> -
</td>
<td> the value to bitwise XOR to the value stored in the atomic object
</td></tr>
<tr class="t-par">
<td> order
</td>
<td> -
</td>
<td> the memory synchronization ordering for this operation: all values are permitted
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/atomic/atomic_fetch_xor&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>The value held previously be the atomic object pointed to by <code>obj</code>.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/atomic/atomic_fetch_xor&action=edit&section=3" title="Edit section: References">edit</a>]</span> <span class="mw-headline" id="References">References</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011):
</li></ul>
<dl><dd><ul><li> 7.17.7.5 The atomic_fetch and modify generic functions (p: 284-285)
</li></ul>
</dd></dl>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/atomic/atomic_fetch_xor&action=edit&section=4" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="atomic_fetch_and.html" title="c/atomic/atomic fetch and"> <span class="t-lines"><span>atomic_fetch_and</span><span>atomic_fetch_and_explicit</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td> atomic logical AND <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:c/atomic/dsc_atomic_fetch_and&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><strong class="selflink"> <span class="t-lines"><span>atomic_fetch_xor</span><span>atomic_fetch_xor_explicit</span></span></strong></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td> atomic logical exclusive OR <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:c/atomic/dsc_atomic_fetch_xor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td colspan="2"> <div class="t-dsc-see"><span><a href="../../cpp/atomic/atomic_fetch_xor.html" title="cpp/atomic/atomic fetch xor">C++ documentation</a></span> for <span class="t-dsc-see-tt"><span>atomic_fetch_xor</span>, <span>atomic_fetch_xor_explicit</span></span></div>
</td></tr>
</table>
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