1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Macro BOOST_TRIBOOL_THIRD_STATE</title> 6<link rel="stylesheet" href="../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="tribool/reference.html#header.boost.logic.tribool_hpp" title="Header <boost/logic/tribool.hpp>"> 10<link rel="prev" href="boost/logic/operator__.html" title="Function operator!="> 11<link rel="next" href="boost/logic/indeterminate_name.html" title="Class template indeterminate_name"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../boost.png"></td> 16<td align="center"><a href="../../index.html">Home</a></td> 17<td align="center"><a href="../../libs/libraries.htm">Libraries</a></td> 18<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 19<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 20<td align="center"><a href="../../more/index.htm">More</a></td> 21</tr></table> 22<hr> 23<div class="spirit-nav"> 24<a accesskey="p" href="boost/logic/operator__.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="tribool/reference.html#header.boost.logic.tribool_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/logic/indeterminate_name.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="BOOST_TRIBOOL_THIRD_STATE"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Macro BOOST_TRIBOOL_THIRD_STATE</span></h2> 30<p>BOOST_TRIBOOL_THIRD_STATE — Declare a new name for the third state of a tribool. </p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<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="tribool/reference.html#header.boost.logic.tribool_hpp" title="Header <boost/logic/tribool.hpp>">boost/logic/tribool.hpp</a>> 34 35</span>BOOST_TRIBOOL_THIRD_STATE(Name)</pre></div> 36<div class="refsect1"> 37<a name="id-1.3.24.5.2.11.4"></a><h2>Description</h2> 38<p>Use this macro to declare a new name for the third state of a tribool. This state can have any number of new names (in addition to <code class="computeroutput">indeterminate</code>), all of which will be equivalent. The new name will be placed in the namespace in which the macro is expanded.</p> 39<p>Example: BOOST_TRIBOOL_THIRD_STATE(true_or_false)</p> 40<p>tribool x(true_or_false); // potentially set x if (true_or_false(x)) { // don't know what x is } </p> 41</div> 42</div> 43<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 44<td align="left"></td> 45<td align="right"><div class="copyright-footer">Copyright © 2002-2004 Douglas Gregor<p>Use, modification and distribution is subject to the Boost 46 Software License, Version 1.0. (See accompanying file 47 <code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p> 48</div></td> 49</tr></table> 50<hr> 51<div class="spirit-nav"> 52<a accesskey="p" href="boost/logic/operator__.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="tribool/reference.html#header.boost.logic.tribool_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/logic/indeterminate_name.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 53</div> 54</body> 55</html> 56
