1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Macro BOOST_LOG_TRIVIAL</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 1. Boost.Log v2"> 8<link rel="up" href="log/reference.html#header.boost.log.trivial_hpp" title="Header <boost/log/trivial.hpp>"> 9<link rel="prev" href="boost/log/trivial/operator_idm46079581288544.html" title="Function template operator>>"> 10<link rel="next" href="core_components.html" title="Core components"> 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="boost/log/trivial/operator_idm46079581288544.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="log/reference.html#header.boost.log.trivial_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="core_components.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 17</div> 18<div class="refentry"> 19<a name="BOOST_LOG_TRIVIAL"></a><div class="titlepage"></div> 20<div class="refnamediv"> 21<h2><span class="refentrytitle">Macro BOOST_LOG_TRIVIAL</span></h2> 22<p>BOOST_LOG_TRIVIAL</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: <<a class="link" href="log/reference.html#header.boost.log.trivial_hpp" title="Header <boost/log/trivial.hpp>">boost/log/trivial.hpp</a>> 26 27</span>BOOST_LOG_TRIVIAL(lvl)</pre></div> 28<div class="refsect1"> 29<a name="idm44984887438848"></a><h2>Description</h2> 30<p>The macro is used to initiate logging. The <code class="computeroutput">lvl</code> argument of the macro specifies one of the following severity levels: <code class="computeroutput">trace</code>, <code class="computeroutput">debug</code>, <code class="computeroutput">info</code>, <code class="computeroutput">warning</code>, <code class="computeroutput">error</code> or <code class="computeroutput">fatal</code> (see <code class="computeroutput">severity_level</code> enum). Following the macro, there may be a streaming expression that composes the record message string. For example:</p> 31<pre class="programlisting"><span class="identifier">BOOST_LOG_TRIVIAL</span><span class="special">(</span><span class="identifier">info</span><span class="special">)</span> <span class="special"><<</span> <span class="string">"Hello, world!"</span><span class="special">;</span> 32</pre> 33<p> </p> 34</div> 35</div> 36<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 37<td align="left"></td> 38<td align="right"><div class="copyright-footer">Copyright © 2007-2019 Andrey Semashev<p> 39 Distributed under the Boost Software License, Version 1.0. (See accompanying 40 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>). 41 </p> 42</div></td> 43</tr></table> 44<hr> 45<div class="spirit-nav"> 46<a accesskey="p" href="boost/log/trivial/operator_idm46079581288544.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="log/reference.html#header.boost.log.trivial_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="core_components.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 47</div> 48</body> 49</html> 50
