libs/log/doc/html/boost/log/once_block_flag.html

   1 <html>
   2 <head>
   3 <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
   4 <title>Struct once_block_flag</title>
   5 <link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
   6 <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
   7 <link rel="home" href="../../index.html" title="Chapter&#160;1.&#160;Boost.Log v2">
   8 <link rel="up" href="../../utilities.html#header.boost.log.utility.once_block_hpp" title="Header &lt;boost/log/utility/once_block.hpp&gt;">
   9 <link rel="prev" href="to_log_idm45711343252512.html" title="Function template to_log">
  10 <link rel="next" href="../../BOOST_LOG_ONCE_BLOCK_INIT.html" title="Macro BOOST_LOG_ONCE_BLOCK_INIT">
  11 </head>
  12 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
  13 <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td></tr></table>
  14 <hr>
  15 <div class="spirit-nav">
  16 <a accesskey="p" href="to_log_idm45711343252512.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../utilities.html#header.boost.log.utility.once_block_hpp"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../../BOOST_LOG_ONCE_BLOCK_INIT.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
  17 </div>
  18 <div class="refentry">
  19 <a name="boost.log.once_block_flag"></a><div class="titlepage"></div>
  20 <div class="refnamediv">
  21 <h2><span class="refentrytitle">Struct once_block_flag</span></h2>
  22 <p>boost::log::once_block_flag &#8212; A flag to detect if a code block has already been executed. </p>
  23 </div>
  24 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  25 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../utilities.html#header.boost.log.utility.once_block_hpp" title="Header &lt;boost/log/utility/once_block.hpp&gt;">boost/log/utility/once_block.hpp</a>&gt;
  26
  27 </span>
  28 <span class="keyword">struct</span> <a class="link" href="once_block_flag.html" title="Struct once_block_flag">once_block_flag</a> <span class="special">{</span>
  29 <span class="special">}</span><span class="special">;</span></pre></div>
  30 <div class="refsect1">
  31 <a name="idm45554723753440"></a><h2>Description</h2>
  32 <p>This structure should be used in conjunction with the <code class="computeroutput">BOOST_LOG_ONCE_BLOCK_FLAG</code> macro. Usage example:</p>
  33 <p><code class="computeroutput"> <a class="link" href="once_block_flag.html" title="Struct once_block_flag">once_block_flag</a> flag = BOOST_LOG_ONCE_BLOCK_INIT;</code></p>
  34 <p><code class="computeroutput">void foo() { BOOST_LOG_ONCE_BLOCK_FLAG(flag) { puts("Hello, world once!"); } } </code> </p>
  35 </div>
  36 </div>
  37 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  38 <td align="left"></td>
  39 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
  40         Distributed under the Boost Software License, Version 1.0. (See accompanying
  41         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
  42       </p>
  43 </div></td>
  44 </tr></table>
  45 <hr>
  46 <div class="spirit-nav">
  47 <a accesskey="p" href="to_log_idm45711343252512.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../utilities.html#header.boost.log.utility.once_block_hpp"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../../BOOST_LOG_ONCE_BLOCK_INIT.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
  48 </div>
  49 </body>
  50 </html>