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                    <div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><div class="t-navbar" style=""><div class="t-navbar-sep">&#160;</div><div class="t-navbar-head"><a href="../../cpp.html" title="cpp"> C++</a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="line-height:1.1em;">
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<p>Version 2 of the C++ Extensions for Library Fundamentals, defines the following new components for the C++ standard library, in addition to those defined in <a href="memory.html" title="cpp/experimental/lib extensions">version 1</a>:
</p><p><br />
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<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="lib_extensions_2.html#The_C.2B.2B_detection_idiom"><span class="tocnumber">1</span> <span class="toctext">The C++ detection idiom</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="lib_extensions_2.html#Logical_operator_type_traits"><span class="tocnumber">2</span> <span class="toctext">Logical operator type traits</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="lib_extensions_2.html#A_const-propagating_wrapper_for_pointer-like_objects"><span class="tocnumber">3</span> <span class="toctext">A const-propagating wrapper for pointer-like objects</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="lib_extensions_2.html#Generalized_callable_negator"><span class="tocnumber">4</span> <span class="toctext">Generalized callable negator</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="lib_extensions_2.html#Non-owning_pointers"><span class="tocnumber">5</span> <span class="toctext">Non-owning pointers</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="lib_extensions_2.html#Uniform_container_erasure"><span class="tocnumber">6</span> <span class="toctext">Uniform container erasure</span></a></li>
<li class="toclevel-1 tocsection-7"><a href="lib_extensions_2.html#std::array_creation"><span class="tocnumber">7</span> <span class="toctext">std::array creation</span></a></li>
<li class="toclevel-1 tocsection-8"><a href="lib_extensions_2.html#ostream_joiner"><span class="tocnumber">8</span> <span class="toctext">ostream_joiner</span></a></li>
<li class="toclevel-1 tocsection-9"><a href="lib_extensions_2.html#Greatest_common_divisor_and_least_common_multiple"><span class="tocnumber">9</span> <span class="toctext">Greatest common divisor and least common multiple</span></a></li>
<li class="toclevel-1 tocsection-10"><a href="lib_extensions_2.html#Simple_random_number_generation_facilities"><span class="tocnumber">10</span> <span class="toctext">Simple random number generation facilities</span></a></li>
<li class="toclevel-1 tocsection-11"><a href="lib_extensions_2.html#Source_code_information_capture"><span class="tocnumber">11</span> <span class="toctext">Source code information capture</span></a></li>
<li class="toclevel-1 tocsection-12"><a href="lib_extensions_2.html#Feature_test_macros"><span class="tocnumber">12</span> <span class="toctext">Feature test macros</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/lib_extensions_2&amp;action=edit&amp;section=1" title="Edit section: The C++ detection idiom">edit</a>]</span> <span class="mw-headline" id="The_C.2B.2B_detection_idiom"> The C++ detection idiom </span></h3>
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<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/type_traits&gt;</code> </div>
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<td>  <div class="t-dsc-member-div"><div><a href="void_t.html" title="cpp/experimental/void t"> <span class="t-lines"><span>void_t</span></span></a></div></div>
</td>
<td>   variadic alias template for <code>void</code> <br /> <span class="t-mark">(alias template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="is_detected.html" title="cpp/experimental/is detected"> <span class="t-lines"><span>is_detected </span><span> detected_t </span><span> detected_or</span></span></a></div></div>
</td>
<td>   Alias templates that detect whether a <i>template-id</i> is well-formed  <br /> <span class="t-mark">(alias template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="nonesuch.html" title="cpp/experimental/nonesuch"> <span class="t-lines"><span>nonesuch</span></span></a></div></div>
</td>
<td>   Class type returned by <span class="t-c"><span class="mw-geshi cpp source-cpp">detected_t</span></span> on failure  <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/lib_extensions_2&amp;action=edit&amp;section=2" title="Edit section: Logical operator type traits">edit</a>]</span> <span class="mw-headline" id="Logical_operator_type_traits"> Logical operator type traits </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/type_traits&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="conjunction.html" title="cpp/experimental/conjunction"> <span class="t-lines"><span>conjunction</span></span></a></div></div>
</td>
<td>   variadic logical AND metafunction <br /> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="disjunction.html" title="cpp/experimental/disjunction"> <span class="t-lines"><span>disjunction</span></span></a></div></div>
</td>
<td>    variadic logical OR metafunction  <br /> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="negation.html" title="cpp/experimental/negation"> <span class="t-lines"><span>negation</span></span></a></div></div>
</td>
<td>    logical NOT metafunction  <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/lib_extensions_2&amp;action=edit&amp;section=3" title="Edit section: A const-propagating wrapper for pointer-like objects">edit</a>]</span> <span class="mw-headline" id="A_const-propagating_wrapper_for_pointer-like_objects">A const-propagating wrapper for pointer-like objects </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/propagate_const&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="propagate_const.html" title="cpp/experimental/propagate const"> <span class="t-lines"><span>propagate_const</span></span></a></div></div>
</td>
<td>   A const-propagating wrapper for pointer-like objects <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/lib_extensions_2&amp;action=edit&amp;section=4" title="Edit section: Generalized callable negator">edit</a>]</span> <span class="mw-headline" id="Generalized_callable_negator"> Generalized callable negator </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/functional&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="not_fn.html" title="cpp/experimental/not fn"> <span class="t-lines"><span>not_fn</span></span></a></div></div>
</td>
<td>   Creates a function object that returns the complement of the result of the function object it holds <br /> <span class="t-mark">(function template)</span>
</td></tr>

</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/lib_extensions_2&amp;action=edit&amp;section=5" title="Edit section: Non-owning pointers">edit</a>]</span> <span class="mw-headline" id="Non-owning_pointers"> Non-owning pointers </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/memory&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="observer_ptr.html" title="cpp/experimental/observer ptr"> <span class="t-lines"><span>observer_ptr</span></span></a></div></div>
</td>
<td>   A class representing a non-owning pointer <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/lib_extensions_2&amp;action=edit&amp;section=6" title="Edit section: Uniform container erasure">edit</a>]</span> <span class="mw-headline" id="Uniform_container_erasure"> Uniform container erasure </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/string&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/erase.html" title="cpp/experimental/basic string/erase"> <span class="t-lines"><span>erase <span class="t-dsc-small">(std::basic_string)</span></span></span></a></div></div>
</td>
<td>   Erases all elements equal to a specific value from a <span class="t-lc"><a href="../string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/erase_if.html" title="cpp/experimental/basic string/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::basic_string)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/deque&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="deque/erase.html" title="cpp/experimental/deque/erase"> <span class="t-lines"><span>erase <span class="t-dsc-small">(std::deque)</span></span></span></a></div></div>
</td>
<td>   Erases all elements equal to a specific value from a <span class="t-lc"><a href="../container/deque.html" title="cpp/container/deque">std::deque</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="deque/erase_if.html" title="cpp/experimental/deque/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::deque)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/deque.html" title="cpp/container/deque">std::deque</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/vector&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="vector/erase.html" title="cpp/experimental/vector/erase"> <span class="t-lines"><span>erase <span class="t-dsc-small">(std::vector)</span></span></span></a></div></div>
</td>
<td>   Erases all elements equal to a specific value from a <span class="t-lc"><a href="../container/vector.html" title="cpp/container/vector">std::vector</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="vector/erase_if.html" title="cpp/experimental/vector/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::vector)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/vector.html" title="cpp/container/vector">std::vector</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/forward_list&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="forward_list/erase.html" title="cpp/experimental/forward list/erase"> <span class="t-lines"><span>erase <span class="t-dsc-small">(std::forward_list)</span></span></span></a></div></div>
</td>
<td>   Erases all elements equal to a specific value from a <span class="t-lc"><a href="../container/forward_list.html" title="cpp/container/forward list">std::forward_list</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="forward_list/erase_if.html" title="cpp/experimental/forward list/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::forward_list)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/forward_list.html" title="cpp/container/forward list">std::forward_list</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/list&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="list/erase.html" title="cpp/experimental/list/erase"> <span class="t-lines"><span>erase <span class="t-dsc-small">(std::list)</span></span></span></a></div></div>
</td>
<td>   Erases all elements equal to a specific value from a <span class="t-lc"><a href="../container/list.html" title="cpp/container/list">std::list</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="list/erase_if.html" title="cpp/experimental/list/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::list)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/list.html" title="cpp/container/list">std::list</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/map&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/erase_if.html" title="cpp/experimental/map/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::map)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/map.html" title="cpp/container/map">std::map</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="multimap/erase_if.html" title="cpp/experimental/multimap/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::multimap)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/multimap.html" title="cpp/container/multimap">std::multimap</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/set&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="set/erase_if.html" title="cpp/experimental/set/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::set)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/set.html" title="cpp/container/set">std::set</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="multiset/erase_if.html" title="cpp/experimental/multiset/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::multiset)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/multiset.html" title="cpp/container/multiset">std::multiset</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/unordered_map&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="unordered_map/erase_if.html" title="cpp/experimental/unordered map/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::unordered_map)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/unordered_map.html" title="cpp/container/unordered map">std::unordered_map</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="unordered_multimap/erase_if.html" title="cpp/experimental/unordered multimap/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::unordered_multimap)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/unordered_multimap.html" title="cpp/container/unordered multimap">std::unordered_multimap</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/unordered_set&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="unordered_set/erase_if.html" title="cpp/experimental/unordered set/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::unordered_set)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/unordered_set.html" title="cpp/container/unordered set">std::unordered_set</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="unordered_multiset/erase_if.html" title="cpp/experimental/unordered multiset/erase if"> <span class="t-lines"><span>erase_if <span class="t-dsc-small">(std::unordered_multiset)</span></span></span></a></div></div>
</td>
<td>   Erases all elements satisfying a predicate from a <span class="t-lc"><a href="../container/unordered_multiset.html" title="cpp/container/unordered multiset">std::unordered_multiset</a></span>  <br /> <span class="t-mark">(function template)</span>
</td></tr>

</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/lib_extensions_2&amp;action=edit&amp;section=7" title="Edit section: std::array creation">edit</a>]</span> <span class="mw-headline" id="std::array_creation"> <code>std::array</code> creation </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/array&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="make_array.html" title="cpp/experimental/make array"> <span class="t-lines"><span>make_array</span></span></a></div></div>
</td>
<td>   Creates a <span class="t-lc"><a href="../container/array.html" title="cpp/container/array">std::array</a></span> object whose size and optionally element type are deduced from the arguments  <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/dsc_make_array&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="to_array.html" title="cpp/experimental/to array"> <span class="t-lines"><span>to_array</span></span></a></div></div>
</td>
<td>   Creates a <span class="t-lc"><a href="../container/array.html" title="cpp/container/array">std::array</a></span> object from a built-in array  <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/dsc_to_array&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/lib_extensions_2&amp;action=edit&amp;section=8" title="Edit section: ostream joiner">edit</a>]</span> <span class="mw-headline" id="ostream_joiner"> <code>ostream_joiner</code> </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/iterator&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="ostream_joiner.html" title="cpp/experimental/ostream joiner"> <span class="t-lines"><span>ostream_joiner</span></span></a></div></div>
</td>
<td>   An output iterator that writes successive elements into an output stream, separating adjacent elements with a delimiter  <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/lib_extensions_2&amp;action=edit&amp;section=9" title="Edit section: Greatest common divisor and least common multiple">edit</a>]</span> <span class="mw-headline" id="Greatest_common_divisor_and_least_common_multiple"> Greatest common divisor and least common multiple </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/numeric&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="gcd.html" title="cpp/experimental/gcd"> <span class="t-lines"><span>gcd</span></span></a></div></div>
</td>
<td>   <code>constexpr</code> function template returning the greatest common divisor of two integers  <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/dsc_gcd&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="lcm.html" title="cpp/experimental/lcm"> <span class="t-lines"><span>lcm</span></span></a></div></div>
</td>
<td>   <code>constexpr</code> function template returning the least common multiple of two integers  <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/dsc_lcm&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/lib_extensions_2&amp;action=edit&amp;section=10" title="Edit section: Simple random number generation facilities">edit</a>]</span> <span class="mw-headline" id="Simple_random_number_generation_facilities"> Simple random number generation facilities </span></h3>
<p><span id="per-thread_engine"></span>A <i>per-thread engine</i> of type <span class="t-lc"><a href="../numeric/random.html" title="cpp/numeric/random">std::default_random_engine</a></span>, initialized to an unpredictable state, is maintained for each thread and used by the functions below.
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/random&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="randint.html" title="cpp/experimental/randint"> <span class="t-lines"><span>randint</span></span></a></div></div>
</td>
<td>   generates a random integer in the specified range  <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/dsc_randint&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="reseed.html" title="cpp/experimental/reseed"> <span class="t-lines"><span>reseed</span></span></a></div></div>
</td>
<td>   reseeds the per-thread random engine  <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:cpp/experimental/dsc_reseed&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/algorithm&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="sample.html" title="cpp/experimental/sample"> <span class="t-lines"><span>sample</span></span></a></div></div>
</td>
<td>   selects n random elements from a sequence  <br /> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="shuffle.html" title="cpp/experimental/shuffle"> <span class="t-lines"><span>shuffle</span></span></a></div></div>
</td>
<td>   randomly re-orders elements in a range  <br /> <span class="t-mark">(function template)</span>
</td></tr>

</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/experimental/lib_extensions_2&amp;action=edit&amp;section=11" title="Edit section: Source code information capture">edit</a>]</span> <span class="mw-headline" id="Source_code_information_capture"> Source code information capture </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/source_location&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="source_location.html" title="cpp/experimental/source location"> <span class="t-lines"><span>source_location</span></span></a></div></div>
</td>
<td>   A class representing information about the source code, such as file names, line numbers, and function names  <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/lib_extensions_2&amp;action=edit&amp;section=12" title="Edit section: Feature test macros">edit</a>]</span> <span class="mw-headline" id="Feature_test_macros">Feature test macros</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/type_traits&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_logical_traits</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201511</span></span></span> indicates that the logical operator type traits are supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_detect</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201505</span></span></span> indicates that the detection idiom is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/propagate_const&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_propagate_const</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201505</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">propagate_const</span></span> is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/functional&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_not_fn</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">not_fn</span></span> is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/memory&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_observer_ptr</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">observer_ptr</span></span> is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/array&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_make_array</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201505</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">make_array</span></span> is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/iterator&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_ostream_joiner</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">ostream_joiner</span></span> is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/vector&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_erase_if</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that uniform container erasure is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/numeric&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_gcd_lcm</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">gcd</span></span> and <span class="t-c"><span class="mw-geshi cpp source-cpp">lcm</span></span> are supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/random&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_randint</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201511</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">randint</span></span> and related functions are supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>



<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;experimental/source_location&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_source_location</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201505</span></span></span> indicates that <span class="t-c"><span class="mw-geshi cpp source-cpp">source_location</span></span> is supported  <br /> <span class="t-mark">(macro constant)</span>
</td></tr>


</table>

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