<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.13"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>libstdc++: Metaprogramming</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtreedata.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> $(document).ready(initResizable); </script> <link href="doxygen.css" rel="stylesheet" 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href="#var-members">Variables</a> </div> <div class="headertitle"> <div class="title">Metaprogramming<div class="ingroups"><a class="el" href="a01431.html">Utilities</a></div></div> </div> </div><!--header--> <div class="contents"> <div class="dynheader"> Collaboration diagram for Metaprogramming:</div> <div class="dyncontent"> <center><table><tr><td><div class="center"><iframe scrolling="no" frameborder="0" src="a01430.svg" width="244" height="36"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe> </div> </td></tr></table></center> </div> <table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a> Classes</h2></td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03837.html">std::__is_nullptr_t< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03485.html">std::integral_constant< _Tp, __v ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03937.html">std::is_abstract< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03845.html">std::is_arithmetic< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03649.html">std::is_array< typename ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03725.html">std::is_class< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03865.html">std::is_compound< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03889.html">std::is_const< typename ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03925.html">std::is_empty< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03717.html">std::is_enum< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03933.html">std::is_final< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03645.html">std::is_floating_point< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03689.html">std::is_function< typename ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03849.html">std::is_fundamental< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03625.html">std::is_integral< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03921.html">std::is_literal_type< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03673.html">std::is_lvalue_reference< typename ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03713.html">std::is_member_function_pointer< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03701.html">std::is_member_object_pointer< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03857.html">std::is_member_pointer< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03833.html">std::is_null_pointer< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03853.html">std::is_object< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03917.html">std::is_pod< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03669.html">std::is_pointer< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03929.html">std::is_polymorphic< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03841.html">std::is_reference< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03681.html">std::is_rvalue_reference< typename ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03861.html">std::is_scalar< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03913.html">std::is_standard_layout< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03905.html">std::is_trivial< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03721.html">std::is_union< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03557.html">std::is_void< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a03897.html">std::is_volatile< typename ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a08569.html">std::tr2::__reflection_typelist< _Elements ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a08577.html">std::tr2::__reflection_typelist< _First, _Rest... ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a08573.html">std::tr2::__reflection_typelist<></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a08589.html">std::tr2::bases< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a08593.html">std::tr2::direct_bases< _Tp ></a></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a> Macros</h2></td></tr> <tr class="memitem:ga8ebc62e255c5994d70e522638f308ace"><td class="memItemLeft" align="right" valign="top"><a id="ga8ebc62e255c5994d70e522638f308ace"></a> #define </td><td class="memItemRight" valign="bottom"><b>__cpp_lib_integral_constant_callable</b></td></tr> <tr class="separator:ga8ebc62e255c5994d70e522638f308ace"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga84a20980f5e80971caf8c4417e345947"><td class="memItemLeft" align="right" valign="top"><a id="ga84a20980f5e80971caf8c4417e345947"></a> #define </td><td class="memItemRight" valign="bottom"><b>__cpp_lib_is_final</b></td></tr> <tr class="separator:ga84a20980f5e80971caf8c4417e345947"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gac6e7d771687ce20ac33cb0d74f4e7ade"><td class="memItemLeft" align="right" valign="top"><a id="gac6e7d771687ce20ac33cb0d74f4e7ade"></a> #define </td><td class="memItemRight" valign="bottom"><b>__cpp_lib_is_null_pointer</b></td></tr> <tr class="separator:gac6e7d771687ce20ac33cb0d74f4e7ade"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a> Typedefs</h2></td></tr> <tr class="memitem:gac8f4c47f527835aee46f6fa174fd35f2"><td class="memTemplParams" colspan="2"><a id="gac8f4c47f527835aee46f6fa174fd35f2"></a> template<bool __v> </td></tr> <tr class="memitem:gac8f4c47f527835aee46f6fa174fd35f2"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>std::__bool_constant</b> = <a class="el" href="a03485.html">integral_constant</a>< bool, __v ></td></tr> <tr class="separator:gac8f4c47f527835aee46f6fa174fd35f2"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaebe6729ab5488ecc76c762873d226857"><td class="memItemLeft" align="right" valign="top">typedef <a class="el" href="a03485.html">integral_constant</a>< bool, false > </td><td class="memItemRight" valign="bottom"><a class="el" href="a01430.html#gaebe6729ab5488ecc76c762873d226857">std::false_type</a></td></tr> <tr class="separator:gaebe6729ab5488ecc76c762873d226857"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga6a860513044e23d34e553ea986e83fa1"><td class="memItemLeft" align="right" valign="top">typedef <a class="el" href="a03485.html">integral_constant</a>< bool, true > </td><td class="memItemRight" valign="bottom"><a class="el" href="a01430.html#ga6a860513044e23d34e553ea986e83fa1">std::true_type</a></td></tr> <tr class="separator:ga6a860513044e23d34e553ea986e83fa1"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga90375d818b402d9d5f041b5ef9447ee6"><td class="memItemLeft" align="right" valign="top"><a id="ga90375d818b402d9d5f041b5ef9447ee6"></a> typedef <a class="el" href="a03485.html">integral_constant</a>< _Tp, __v > </td><td class="memItemRight" valign="bottom"><b>std::integral_constant< _Tp, __v >::type</b></td></tr> <tr class="separator:ga90375d818b402d9d5f041b5ef9447ee6"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaf233acba3feea5726f6aebe71239a495"><td class="memItemLeft" align="right" valign="top"><a id="gaf233acba3feea5726f6aebe71239a495"></a> typedef _Tp </td><td class="memItemRight" valign="bottom"><b>std::__success_type< _Tp >::type</b></td></tr> <tr class="separator:gaf233acba3feea5726f6aebe71239a495"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaaa277335ecdb9178ce008e6affbfcb44"><td class="memItemLeft" align="right" valign="top"><a id="gaaa277335ecdb9178ce008e6affbfcb44"></a> typedef _Tp </td><td class="memItemRight" valign="bottom"><b>std::integral_constant< _Tp, __v >::value_type</b></td></tr> <tr class="separator:gaaa277335ecdb9178ce008e6affbfcb44"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> Functions</h2></td></tr> <tr class="memitem:ga734946b817922933d3e97d1057f0cc9f"><td class="memItemLeft" align="right" valign="top"><a id="ga734946b817922933d3e97d1057f0cc9f"></a> constexpr </td><td class="memItemRight" valign="bottom"><b>std::integral_constant< _Tp, __v >::operator value_type</b> () const</td></tr> <tr class="separator:ga734946b817922933d3e97d1057f0cc9f"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gaa591b39ac7716c5ab6b06aab1cb98a51"><td class="memItemLeft" align="right" valign="top"><a id="gaa591b39ac7716c5ab6b06aab1cb98a51"></a> constexpr value_type </td><td class="memItemRight" valign="bottom"><b>std::integral_constant< _Tp, __v >::operator()</b> () const</td></tr> <tr class="separator:gaa591b39ac7716c5ab6b06aab1cb98a51"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a> Variables</h2></td></tr> <tr class="memitem:gac5dbc0d791c11f4db2a8f32921d16527"><td class="memItemLeft" align="right" valign="top"><a id="gac5dbc0d791c11f4db2a8f32921d16527"></a> static constexpr _Tp </td><td class="memItemRight" valign="bottom"><b>std::integral_constant< _Tp, __v >::value</b></td></tr> <tr class="separator:gac5dbc0d791c11f4db2a8f32921d16527"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <p>Template utilities for compile-time introspection and modification, including type classification traits, type property inspection traits and type transformation traits. </p> <h2 class="groupheader">Typedef Documentation</h2> <a id="gaebe6729ab5488ecc76c762873d226857"></a> <h2 class="memtitle"><span class="permalink"><a href="#gaebe6729ab5488ecc76c762873d226857">◆ </a></span>false_type</h2> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef <a class="el" href="a03485.html">integral_constant</a><bool, false> <a class="el" href="a01430.html#gaebe6729ab5488ecc76c762873d226857">std::false_type</a></td> </tr> </table> </div><div class="memdoc"> <p>The type used as a compile-time boolean with false value. </p> <p class="definition">Definition at line <a class="el" href="a00161_source.html#l00090">90</a> of file <a class="el" href="a00161_source.html">type_traits</a>.</p> </div> </div> <a id="ga6a860513044e23d34e553ea986e83fa1"></a> <h2 class="memtitle"><span class="permalink"><a href="#ga6a860513044e23d34e553ea986e83fa1">◆ </a></span>true_type</h2> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef <a class="el" href="a03485.html">integral_constant</a><bool, true> <a class="el" href="a01430.html#ga6a860513044e23d34e553ea986e83fa1">std::true_type</a></td> </tr> </table> </div><div class="memdoc"> <p>The type used as a compile-time boolean with true value. </p> <p class="definition">Definition at line <a class="el" href="a00161_source.html#l00087">87</a> of file <a class="el" href="a00161_source.html">type_traits</a>.</p> </div> </div> </div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="footer">Generated by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.13 </li> </ul> </div> </body> </html>