<!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 1.8.12"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>MuldeR's Utilities for Qt: MUtils::Lazy< T > 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="../../search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="../../search/searchdata.js"></script> <script type="text/javascript" src="../../search/search.js"></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">MuldeR's Utilities for Qt </div> <div id="projectbrief">MUtilities</div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.12 --> <script type="text/javascript"> var searchBox = new SearchBox("searchBox", "../../search",false,'Search'); </script> <script type="text/javascript" src="../../menudata.js"></script> <script type="text/javascript" src="../../menu.js"></script> <script type="text/javascript"> $(function() { initMenu('../../',true,false,'search.php','Search'); $(document).ready(function() { init_search(); }); }); </script> <div id="main-nav"></div> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> </div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <iframe src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> <div id="nav-path" class="navpath"> <ul> <li class="navelem"><a class="el" href="../../d3/da6/namespace_m_utils.html">MUtils</a></li><li class="navelem"><a class="el" href="../../d0/dce/class_m_utils_1_1_lazy.html">Lazy</a></li> </ul> </div> </div><!-- top --> <div class="header"> <div class="summary"> <a href="#pub-methods">Public Member Functions</a> | <a href="#pro-methods">Protected Member Functions</a> | <a href="../../da/d44/class_m_utils_1_1_lazy-members.html">List of all members</a> </div> <div class="headertitle"> <div class="title">MUtils::Lazy< T > Class Template Reference</div> </div> </div><!--header--> <div class="contents"> <p><a class="el" href="../../d0/dce/class_m_utils_1_1_lazy.html" title="Lazy initialization template class. ">Lazy</a> initialization template class. <a href="../../d0/dce/class_m_utils_1_1_lazy.html#details">More...</a></p> <p><code>#include <<a class="el" href="../../d8/d4d/_lazy_8h_source.html">Lazy.h</a>></code></p> <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:a7dc7baa7d7ac31c644965be2ccc4d8cd"><td class="memItemLeft" align="right" valign="top"><a id="a7dc7baa7d7ac31c644965be2ccc4d8cd"></a>  </td><td class="memItemRight" valign="bottom"><b>Lazy</b> (std::function< T *(void)> &&initializer)</td></tr> <tr class="separator:a7dc7baa7d7ac31c644965be2ccc4d8cd"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a86cf7d344a38ea09d37d27acd8993f45"><td class="memItemLeft" align="right" valign="top"><a id="a86cf7d344a38ea09d37d27acd8993f45"></a> T & </td><td class="memItemRight" valign="bottom"><b>operator*</b> (void)</td></tr> <tr class="separator:a86cf7d344a38ea09d37d27acd8993f45"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a3ef8b04a4d52c1f23881ff105d50f0ed"><td class="memItemLeft" align="right" valign="top"><a id="a3ef8b04a4d52c1f23881ff105d50f0ed"></a> T * </td><td class="memItemRight" valign="bottom"><b>operator-></b> (void)</td></tr> <tr class="separator:a3ef8b04a4d52c1f23881ff105d50f0ed"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a69c9d6b10e84022d445373ebf2b97666"><td class="memItemLeft" align="right" valign="top"><a id="a69c9d6b10e84022d445373ebf2b97666"></a> bool </td><td class="memItemRight" valign="bottom"><b>initialized</b> ()</td></tr> <tr class="separator:a69c9d6b10e84022d445373ebf2b97666"><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:ae7ffe6f28fdfe857aee91934e2547d9a"><td class="memItemLeft" align="right" valign="top"><a id="ae7ffe6f28fdfe857aee91934e2547d9a"></a> __forceinline T * </td><td class="memItemRight" valign="bottom"><b>getValue</b> ()</td></tr> <tr class="separator:ae7ffe6f28fdfe857aee91934e2547d9a"><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 T><br /> class MUtils::Lazy< T ></h3> <p><a class="el" href="../../d0/dce/class_m_utils_1_1_lazy.html" title="Lazy initialization template class. ">Lazy</a> initialization template class. </p> <p>The lazy-initialized value of type T can be obtained from a <code><a class="el" href="../../d0/dce/class_m_utils_1_1_lazy.html" title="Lazy initialization template class. ">Lazy</a><T></code> instance by using the <code>operator*()</code>. Initialization of the value happens when the <code>operator*()</code> is called for the very first time, by invoking the <code>initializer</code> lambda-function that was passed to the constructor. The return value of the <code>initializer</code> lambda-function is then stored internally, so that any subsequent call to the <code>operator*()</code> <em>immediately</em> returns the previously created value.</p> <p><b>Note on thread-saftey:</b> This class is thread-safe in the sense that all calls to <code>operator*()</code> on the same <code><a class="el" href="../../d0/dce/class_m_utils_1_1_lazy.html" title="Lazy initialization template class. ">Lazy</a><T></code> instance, regardless from which thread, are guaranteed to return the exactly same value/object. The <em>first</em> thread trying to access the value will invoke the <code>initializer</code> lambda-function; concurrent threads may need to busy-wait until the initialization is completed. The <code>initializer</code> lambda-function is invoked at most once. </p> </div><hr/>The documentation for this class was generated from the following file:<ul> <li>include/MUtils/<a class="el" href="../../d8/d4d/_lazy_8h_source.html">Lazy.h</a></li> </ul> </div><!-- contents --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="../../doxygen.png" alt="doxygen"/> </a> 1.8.12 </small></address> </body> </html>