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<tr class="t-nv-h1"><td colspan="5"> <a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism/execution_policy&action=edit&redlink=1" class="new" title="cpp/experimental/parallelism/execution policy (page does not exist)">Execution policies</a></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="execution_policy_tag_t.html" title="cpp/experimental/execution policy tag t"><span class="t-lines"><span>parallel::sequential_execution_policy</span><span>parallel::parallel_execution_policy</span><span>parallel::parallel_vector_execution_policy</span></span></a></div></div></td></tr>
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<p>The C++ Extensions for Parallelism, ISO/IEC TS 19570:2015 defines the following new components for the C++ standard library:
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="parallelism.html#Execution_policies"><span class="tocnumber">1</span> <span class="toctext">Execution policies</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="parallelism.html#Exception_lists"><span class="tocnumber">2</span> <span class="toctext">Exception lists</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="parallelism.html#Parallelized_versions_of_existing_algorithms"><span class="tocnumber">3</span> <span class="toctext">Parallelized versions of existing algorithms</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="parallelism.html#New_algorithms"><span class="tocnumber">4</span> <span class="toctext">New algorithms</span></a></li>
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</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism&action=edit&section=1" title="Edit section: Execution policies">edit</a>]</span> <span class="mw-headline" id="Execution_policies">Execution policies</span></h3>
<p>The parallelism TS describes three execution policies: <a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism/execution_policy&action=edit&redlink=1" class="new" title="cpp/experimental/parallelism/execution policy (page does not exist)">sequential</a>, <a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism/execution_policy&action=edit&redlink=1" class="new" title="cpp/experimental/parallelism/execution policy (page does not exist)">parallel</a>, and <a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism/execution_policy&action=edit&redlink=1" class="new" title="cpp/experimental/parallelism/execution policy (page does not exist)">parallel+vector</a>, and provides corresponding execution policy types and objects. Users may select an execution policy statically by invoking a parallel algorithm with the an execution policy object of the corresponding type, or dynamically by using the type-erasing <code>execution_policy</code> class.
</p><p>Implementations may define additional execution policies as an extension. The semantics of parallel algorithms invoked with an execution policy object of implementation-defined type is implementation-defined.
</p>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><experimental/execution_policy></code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="execution_policy_tag_t.html" title="cpp/experimental/execution policy tag t"> <span class="t-lines"><span>sequential_execution_policy</span><span>parallel_execution_policy</span><span>parallel_vector_execution_policy</span></span></a></div></div>
</td>
<td> execution policy types <br /> <span class="t-mark">(class)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="execution_policy_tag.html" title="cpp/experimental/execution policy tag"> <span class="t-lines"><span>seq</span><span>par</span><span>par_vec</span></span></a></div></div>
</td>
<td> global execution policy objects <br /> <span class="t-mark">(constant)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/execution_policy&action=edit&redlink=1" class="new" title="cpp/experimental/execution policy (page does not exist)"> <span class="t-lines"><span>execution_policy</span></span></a></div></div>
</td>
<td> dynamic execution policy <br /> <span class="t-mark">(class)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="is_execution_policy.html" title="cpp/experimental/is execution policy"> <span class="t-lines"><span>is_execution_policy</span></span></a></div></div>
</td>
<td> test whether a class represents an execution policy <br /> <span class="t-mark">(class template)</span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism&action=edit&section=2" title="Edit section: Exception lists">edit</a>]</span> <span class="mw-headline" id="Exception_lists"> Exception lists </span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><experimental/exception_list></code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/exception_list&action=edit&redlink=1" class="new" title="cpp/experimental/exception list (page does not exist)"> <span class="t-lines"><span>exception_list</span></span></a></div></div>
</td>
<td> exceptions raised during parallel executions <br /> <span class="t-mark">(class)</span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism&action=edit&section=3" title="Edit section: Parallelized versions of existing algorithms">edit</a>]</span> <span class="mw-headline" id="Parallelized_versions_of_existing_algorithms">Parallelized versions of existing algorithms</span></h3>
<p>The TS provides <a href="parallelism/existing.html" title="cpp/experimental/parallelism/existing">parallelized versions</a> of the following 69 algorithms from <algorithm>, <numeric> and <memory>:
</p>
<div style="margin-left:0px">
<table class="mw-collapsible mw-collapsed" style="background: transparent; text-align: left; border: 1px solid silver; margin: 0.2em auto auto; width:100%; clear: both; padding: 1px;">
<tr>
<th style="background: #F0F2F5; font-size:87%; padding:0.2em 0.3em; text-align:center;"> <span style="font-size:115%">Standard library algorithms for which parallelized versions are provided</span>
</th></tr>
<tr>
<td style="border: solid 1px silver; padding: 8px; background: white;">
<div class="div-col columns column-count column-count-3" style="-moz-column-count: 3; -webkit-column-count: 3; column-count: 3;">
<ul><li> <span class="t-lc"><a href="../algorithm/adjacent_difference.html" title="cpp/algorithm/adjacent difference">std::adjacent_difference</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/adjacent_find.html" title="cpp/algorithm/adjacent find">std::adjacent_find</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/all_any_none_of.html" title="cpp/algorithm/all any none of">std::all_of</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/all_any_none_of.html" title="cpp/algorithm/all any none of">std::any_of</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/copy.html" title="cpp/algorithm/copy">std::copy</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/copy.html" title="cpp/algorithm/copy">std::copy_if</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/copy_n.html" title="cpp/algorithm/copy n">std::copy_n</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/count.html" title="cpp/algorithm/count">std::count</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/count.html" title="cpp/algorithm/count">std::count_if</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/equal.html" title="cpp/algorithm/equal">std::equal</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/fill.html" title="cpp/algorithm/fill">std::fill</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/fill_n.html" title="cpp/algorithm/fill n">std::fill_n</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/find.html" title="cpp/algorithm/find">std::find</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/find_end.html" title="cpp/algorithm/find end">std::find_end</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/find_first_of.html" title="cpp/algorithm/find first of">std::find_first_of</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/find.html" title="cpp/algorithm/find">std::find_if</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/find.html" title="cpp/algorithm/find">std::find_if_not</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/generate.html" title="cpp/algorithm/generate">std::generate</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/generate_n.html" title="cpp/algorithm/generate n">std::generate_n</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/includes.html" title="cpp/algorithm/includes">std::includes</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/inner_product.html" title="cpp/algorithm/inner product">std::inner_product</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/inplace_merge.html" title="cpp/algorithm/inplace merge">std::inplace_merge</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/is_heap.html" title="cpp/algorithm/is heap">std::is_heap</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/is_heap_until.html" title="cpp/algorithm/is heap until">std::is_heap_until</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/is_partitioned.html" title="cpp/algorithm/is partitioned">std::is_partitioned</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/is_sorted.html" title="cpp/algorithm/is sorted">std::is_sorted</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/is_sorted_until.html" title="cpp/algorithm/is sorted until">std::is_sorted_until</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/lexicographical_compare.html" title="cpp/algorithm/lexicographical compare">std::lexicographical_compare</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/max_element.html" title="cpp/algorithm/max element">std::max_element</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/merge.html" title="cpp/algorithm/merge">std::merge</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/min_element.html" title="cpp/algorithm/min element">std::min_element</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/minmax_element.html" title="cpp/algorithm/minmax element">std::minmax_element</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/mismatch.html" title="cpp/algorithm/mismatch">std::mismatch</a></span>
</li><li> <a href="../algorithm/move.html" title="cpp/algorithm/move"><tt>std::move</tt></a>
</li><li> <span class="t-lc"><a href="../algorithm/all_any_none_of.html" title="cpp/algorithm/all any none of">std::none_of</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/nth_element.html" title="cpp/algorithm/nth element">std::nth_element</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/partial_sort.html" title="cpp/algorithm/partial sort">std::partial_sort</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/partial_sort_copy.html" title="cpp/algorithm/partial sort copy">std::partial_sort_copy</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/partition.html" title="cpp/algorithm/partition">std::partition</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/partition_copy.html" title="cpp/algorithm/partition copy">std::partition_copy</a></span>
</li><li> <a href="../algorithm/remove.html" title="cpp/algorithm/remove"><tt>std::remove</tt></a>
</li><li> <span class="t-lc"><a href="../algorithm/remove_copy.html" title="cpp/algorithm/remove copy">std::remove_copy</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/remove_copy.html" title="cpp/algorithm/remove copy">std::remove_copy_if</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/remove.html" title="cpp/algorithm/remove">std::remove_if</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/replace.html" title="cpp/algorithm/replace">std::replace</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/replace_copy.html" title="cpp/algorithm/replace copy">std::replace_copy</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/replace_copy.html" title="cpp/algorithm/replace copy">std::replace_copy_if</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/replace.html" title="cpp/algorithm/replace">std::replace_if</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/reverse.html" title="cpp/algorithm/reverse">std::reverse</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/reverse_copy.html" title="cpp/algorithm/reverse copy">std::reverse_copy</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/rotate.html" title="cpp/algorithm/rotate">std::rotate</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/rotate_copy.html" title="cpp/algorithm/rotate copy">std::rotate_copy</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/search.html" title="cpp/algorithm/search">std::search</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/search_n.html" title="cpp/algorithm/search n">std::search_n</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/set_difference.html" title="cpp/algorithm/set difference">std::set_difference</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/set_intersection.html" title="cpp/algorithm/set intersection">std::set_intersection</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/set_symmetric_difference.html" title="cpp/algorithm/set symmetric difference">std::set_symmetric_difference</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/set_union.html" title="cpp/algorithm/set union">std::set_union</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/sort.html" title="cpp/algorithm/sort">std::sort</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/stable_partition.html" title="cpp/algorithm/stable partition">std::stable_partition</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/stable_sort.html" title="cpp/algorithm/stable sort">std::stable_sort</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/swap_ranges.html" title="cpp/algorithm/swap ranges">std::swap_ranges</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/transform.html" title="cpp/algorithm/transform">std::transform</a></span>
</li><li> <span class="t-lc"><a href="../memory/uninitialized_copy.html" title="cpp/memory/uninitialized copy">std::uninitialized_copy</a></span>
</li><li> <span class="t-lc"><a href="../memory/uninitialized_copy_n.html" title="cpp/memory/uninitialized copy n">std::uninitialized_copy_n</a></span>
</li><li> <span class="t-lc"><a href="../memory/uninitialized_fill.html" title="cpp/memory/uninitialized fill">std::uninitialized_fill</a></span>
</li><li> <span class="t-lc"><a href="../memory/uninitialized_fill_n.html" title="cpp/memory/uninitialized fill n">std::uninitialized_fill_n</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/unique.html" title="cpp/algorithm/unique">std::unique</a></span>
</li><li> <span class="t-lc"><a href="../algorithm/unique_copy.html" title="cpp/algorithm/unique copy">std::unique_copy</a></span>
</li></ul>
</div>
</td></tr></table></div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/parallelism&action=edit&section=4" title="Edit section: New algorithms">edit</a>]</span> <span class="mw-headline" id="New_algorithms">New algorithms</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><experimental/algorithm></code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/for_each&action=edit&redlink=1" class="new" title="cpp/experimental/for each (page does not exist)"> <span class="t-lines"><span>for_each</span></span></a></div></div>
</td>
<td> similar to <span class="t-lc"><a href="../algorithm/for_each.html" title="cpp/algorithm/for each">std::for_each</a></span> except returns void <br /> <span class="t-mark">(function template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/for_each_n&action=edit&redlink=1" class="new" title="cpp/experimental/for each n (page does not exist)"> <span class="t-lines"><span>for_each_n</span></span></a></div></div>
</td>
<td> applies a function object to the first n elements of a sequence <br /> <span class="t-mark">(function template)</span>
</td></tr>
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><experimental/numeric></code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="reduce.html" title="cpp/experimental/reduce"> <span class="t-lines"><span>reduce</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-fs-ts t-mark-ts">(parallelism TS)</span></span></span></div></div>
</td>
<td> similar to <span class="t-lc"><a href="../algorithm/accumulate.html" title="cpp/algorithm/accumulate">std::accumulate</a></span>, except out of order <br /> <span class="t-mark">(function template)</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:cpp/experimental/parallelism/dsc_reduce&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/exclusive_scan&action=edit&redlink=1" class="new" title="cpp/experimental/exclusive scan (page does not exist)"> <span class="t-lines"><span>exclusive_scan</span></span></a></div></div>
</td>
<td> similar to <span class="t-lc"><a href="../algorithm/partial_sum.html" title="cpp/algorithm/partial sum">std::partial_sum</a></span>, excludes the ith input element from the ith sum <br /> <span class="t-mark">(function template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/inclusive_scan&action=edit&redlink=1" class="new" title="cpp/experimental/inclusive scan (page does not exist)"> <span class="t-lines"><span>inclusive_scan</span></span></a></div></div>
</td>
<td> similar to <span class="t-lc"><a href="../algorithm/partial_sum.html" title="cpp/algorithm/partial sum">std::partial_sum</a></span>, includes the ith input element in the ith sum <br /> <span class="t-mark">(function template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="transform_reduce.html" title="cpp/experimental/transform reduce"> <span class="t-lines"><span>transform_reduce</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-fs-ts t-mark-ts">(parallelism TS)</span></span></span></div></div>
</td>
<td> applies a functor, then reduces out of order <br /> <span class="t-mark">(function template)</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:cpp/experimental/parallelism/dsc_transform_reduce&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/transform_exclusive_scan&action=edit&redlink=1" class="new" title="cpp/experimental/transform exclusive scan (page does not exist)"> <span class="t-lines"><span>transform_exclusive_scan</span></span></a></div></div>
</td>
<td> applies a functor, then calculates exclusive scan <br /> <span class="t-mark">(function template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/transform_inclusive_scan&action=edit&redlink=1" class="new" title="cpp/experimental/transform inclusive scan (page does not exist)"> <span class="t-lines"><span>transform_inclusive_scan</span></span></a></div></div>
</td>
<td> applies a functor, then calculates inclusive scan <br /> <span class="t-mark">(function template)</span>
</td></tr>
</table>
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