<!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++: std::experimental::fundamentals_v1::_Optional_base< _Tp, _ShouldProvideDestructor > Class Template Reference</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" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td id="projectalign" style="padding-left: 0.5em;"> <div id="projectname">libstdc++ </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.13 --> </div><!-- top --> <div id="side-nav" class="ui-resizable side-nav-resizable"> <div id="nav-tree"> <div id="nav-tree-contents"> <div id="nav-sync" class="sync"></div> </div> </div> <div id="splitbar" style="-moz-user-select:none;" class="ui-resizable-handle"> </div> </div> <script type="text/javascript"> $(document).ready(function(){initNavTree('a08789.html','');}); </script> <div id="doc-content"> <div class="header"> <div class="summary"> <a href="#pub-methods">Public Member Functions</a> | <a href="#pro-methods">Protected Member Functions</a> | <a href="a08786.html">List of all members</a> </div> <div class="headertitle"> <div class="title">std::experimental::fundamentals_v1::_Optional_base< _Tp, _ShouldProvideDestructor > Class Template Reference<div class="ingroups"><a class="el" href="a01464.html">Experimental</a> » <a class="el" href="a01465.html">Optional values</a></div></div> </div> </div><!--header--> <div class="contents"> <table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a> Public Member Functions</h2></td></tr> <tr class="memitem:a999fa60015301e6579d439b433f3e482"><td class="memItemLeft" align="right" valign="top"><a id="a999fa60015301e6579d439b433f3e482"></a> constexpr </td><td class="memItemRight" valign="bottom"><b>_Optional_base</b> (<a class="el" href="a08761.html">nullopt_t</a>) noexcept</td></tr> <tr class="separator:a999fa60015301e6579d439b433f3e482"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a4bf2a22a04677e206111529889051dbb"><td class="memItemLeft" align="right" valign="top"><a id="a4bf2a22a04677e206111529889051dbb"></a> constexpr </td><td class="memItemRight" valign="bottom"><b>_Optional_base</b> (const _Tp &__t)</td></tr> <tr class="separator:a4bf2a22a04677e206111529889051dbb"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a7988432ed72e6d8acaa1baf6c1358500"><td class="memItemLeft" align="right" valign="top"><a id="a7988432ed72e6d8acaa1baf6c1358500"></a> constexpr </td><td class="memItemRight" valign="bottom"><b>_Optional_base</b> (_Tp &&__t)</td></tr> <tr class="separator:a7988432ed72e6d8acaa1baf6c1358500"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a11cb698edef776c53c8c04ca55569706"><td class="memTemplParams" colspan="2"><a id="a11cb698edef776c53c8c04ca55569706"></a> template<typename... _Args> </td></tr> <tr class="memitem:a11cb698edef776c53c8c04ca55569706"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>_Optional_base</b> (<a class="el" href="a08757.html">in_place_t</a>, _Args &&... __args)</td></tr> <tr class="separator:a11cb698edef776c53c8c04ca55569706"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ac57b62ecebb108ce4775f73f577f713a"><td class="memTemplParams" colspan="2"><a id="ac57b62ecebb108ce4775f73f577f713a"></a> template<typename _Up , typename... _Args, enable_if_t< is_constructible< _Tp, initializer_list< _Up > &, _Args &&... >::value, int > ...> </td></tr> <tr class="memitem:ac57b62ecebb108ce4775f73f577f713a"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>_Optional_base</b> (<a class="el" href="a08757.html">in_place_t</a>, <a class="el" href="a01601.html">initializer_list</a>< _Up > __il, _Args &&... __args)</td></tr> <tr class="separator:ac57b62ecebb108ce4775f73f577f713a"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:af36d43053abe092c80a5460b3c751713"><td class="memItemLeft" align="right" valign="top"><a id="af36d43053abe092c80a5460b3c751713"></a>  </td><td class="memItemRight" valign="bottom"><b>_Optional_base</b> (const <a class="el" href="a08789.html">_Optional_base</a> &__other)</td></tr> <tr class="separator:af36d43053abe092c80a5460b3c751713"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a1121a954d7900136fcd8c588cb1fdc80"><td class="memItemLeft" align="right" valign="top"><a id="a1121a954d7900136fcd8c588cb1fdc80"></a>  </td><td class="memItemRight" valign="bottom"><b>_Optional_base</b> (<a class="el" href="a08789.html">_Optional_base</a> &&__other) noexcept(is_nothrow_move_constructible< _Tp >())</td></tr> <tr class="separator:a1121a954d7900136fcd8c588cb1fdc80"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a61d187b5753f010a757500a4100ed28b"><td class="memItemLeft" align="right" valign="top"><a id="a61d187b5753f010a757500a4100ed28b"></a> <a class="el" href="a08789.html">_Optional_base</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="a08789.html">_Optional_base</a> &__other)</td></tr> <tr class="separator:a61d187b5753f010a757500a4100ed28b"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a14a88b84b5995ea7376d96948ebaf3ed"><td class="memItemLeft" align="right" valign="top"><a id="a14a88b84b5995ea7376d96948ebaf3ed"></a> <a class="el" href="a08789.html">_Optional_base</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a08789.html">_Optional_base</a> &&__other) noexcept(__and_< is_nothrow_move_constructible< _Tp >, is_nothrow_move_assignable< _Tp >>())</td></tr> <tr class="separator:a14a88b84b5995ea7376d96948ebaf3ed"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a> Protected Member Functions</h2></td></tr> <tr class="memitem:a5f7e19fcb7081501ee50aae38d478e61"><td class="memTemplParams" colspan="2"><a id="a5f7e19fcb7081501ee50aae38d478e61"></a> template<typename... _Args> </td></tr> <tr class="memitem:a5f7e19fcb7081501ee50aae38d478e61"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>_M_construct</b> (_Args &&... __args) noexcept(is_nothrow_constructible< _Stored_type, _Args... >())</td></tr> <tr class="separator:a5f7e19fcb7081501ee50aae38d478e61"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a96d812b20d3183e6b497745cdc137755"><td class="memItemLeft" align="right" valign="top"><a id="a96d812b20d3183e6b497745cdc137755"></a> void </td><td class="memItemRight" valign="bottom"><b>_M_destruct</b> ()</td></tr> <tr class="separator:a96d812b20d3183e6b497745cdc137755"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a698ed4e258d9ae1c7f45f979ceb76f89"><td class="memItemLeft" align="right" valign="top"><a id="a698ed4e258d9ae1c7f45f979ceb76f89"></a> constexpr _Tp & </td><td class="memItemRight" valign="bottom"><b>_M_get</b> () noexcept</td></tr> <tr class="separator:a698ed4e258d9ae1c7f45f979ceb76f89"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a45d33d4ca6103f62792dd09c0ed3098a"><td class="memItemLeft" align="right" valign="top"><a id="a45d33d4ca6103f62792dd09c0ed3098a"></a> constexpr const _Tp & </td><td class="memItemRight" valign="bottom"><b>_M_get</b> () const noexcept</td></tr> <tr class="separator:a45d33d4ca6103f62792dd09c0ed3098a"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a4332c57253ae418a0b71172a10826746"><td class="memItemLeft" align="right" valign="top"><a id="a4332c57253ae418a0b71172a10826746"></a> constexpr bool </td><td class="memItemRight" valign="bottom"><b>_M_is_engaged</b> () const noexcept</td></tr> <tr class="separator:a4332c57253ae418a0b71172a10826746"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a670a447d59e9022c7f9dc3105f737f6a"><td class="memItemLeft" align="right" valign="top"><a id="a670a447d59e9022c7f9dc3105f737f6a"></a> void </td><td class="memItemRight" valign="bottom"><b>_M_reset</b> ()</td></tr> <tr class="separator:a670a447d59e9022c7f9dc3105f737f6a"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <div class="textblock"><h3>template<typename _Tp, bool _ShouldProvideDestructor = !is_trivially_destructible<_Tp>::value><br /> class std::experimental::fundamentals_v1::_Optional_base< _Tp, _ShouldProvideDestructor ></h3> <p>Class template that holds the necessary state for <a class="el" href="a01465.html">Optional values</a> and that has the responsibility for construction and the special members. </p> <p>Such a separate base class template is necessary in order to conditionally enable the special members (e.g. copy/move constructors). Note that this means that <a class="el" href="a08789.html">_Optional_base</a> implements the functionality for copy and move assignment, but not for converting assignment.</p> <dl class="section see"><dt>See also</dt><dd>optional, _Enable_special_members </dd></dl> <p class="definition">Definition at line <a class="el" href="a00962_source.html#l00204">204</a> of file <a class="el" href="a00962_source.html">optional</a>.</p> </div><hr/>The documentation for this class was generated from the following file:<ul> <li><a class="el" href="a00962_source.html">optional</a></li> </ul> </div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="navelem"><a class="el" href="a01487.html">std</a></li><li class="navelem"><b>experimental</b></li><li class="navelem"><b>fundamentals_v1</b></li><li class="navelem"><a class="el" href="a08789.html">_Optional_base</a></li> <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>