1<?xml version="1.0" encoding="utf-8" ?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4<head> 5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> 7<title>The MPL Reference Manual: negate</title> 8<link rel="stylesheet" href="../style.css" type="text/css" /> 9</head> 10<body class="docframe refmanual"> 11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./modulus.html" class="navigation-link">Prev</a> <a href="./comparisons.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./modulus.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./arithmetic-operations.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> 12<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./arithmetic-operations.html" class="navigation-link">Arithmetic Operations</a> / <a href="./negate.html" class="navigation-link">negate</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="negate"> 15<h1><a class="toc-backref" href="./arithmetic-operations.html#id1541">negate</a></h1> 16<div class="section" id="id1005"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename T 21 > 22struct <a href="./negate.html" class="identifier">negate</a> 23{ 24 typedef <em>unspecified</em> type; 25}; 26</pre> 27</div> 28<div class="section" id="id1006"> 29<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 30<p>Returns the negative (additive inverse) of its argument.</p> 31</div> 32<div class="section" id="id1007"> 33<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 34<pre class="literal-block"> 35#include <<a href="../../../../boost/mpl/negate.hpp" class="header">boost/mpl/negate.hpp</a>> 36#include <<a href="../../../../boost/mpl/arithmetic.hpp" class="header">boost/mpl/arithmetic.hpp</a>> 37</pre> 38</div> 39<div class="section" id="id1008"> 40<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 41<p><a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a></p> 42</div> 43<div class="section" id="id1009"> 44<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 45<table border="1" class="docutils table"> 46<colgroup> 47<col width="17%" /> 48<col width="30%" /> 49<col width="53%" /> 50</colgroup> 51<thead valign="bottom"> 52<tr><th class="head">Parameter</th> 53<th class="head">Requirement</th> 54<th class="head">Description</th> 55</tr> 56</thead> 57<tbody valign="top"> 58<tr><td><tt class="literal"><span class="pre">T</span></tt></td> 59<td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> 60<td>Operation's argument.</td> 61</tr> 62</tbody> 63</table> 64<p>[<em>Note:</em> The requirements listed in this specification 65are the ones imposed by the default implementation. See <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a> concept 66for the details on how to provide an implementation for a user-defined numeric type 67that does not satisfy the <a class="reference internal" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p> 68</div> 69<div class="section" id="id1010"> 70<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 71<p>For any <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt>:</p> 72<pre class="literal-block"> 73typedef <a href="./negate.html" class="identifier">negate</a><c>::type r; 74</pre> 75<table class="docutils field-list" frame="void" rules="none"> 76<col class="field-name" /> 77<col class="field-body" /> 78<tbody valign="top"> 79<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p> 80</td> 81</tr> 82<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 83<pre class="last literal-block"> 84typedef <a href="./integral-c.html" class="identifier">integral_c</a>< c::<a href="./value-type.html" class="identifier">value_type</a>, ( -c::value ) > r; 85</pre> 86</td> 87</tr> 88</tbody> 89</table> 90<!-- .......................................................................... --> 91<pre class="literal-block"> 92typedef <a href="./negate.html" class="identifier">negate</a><c> r; 93</pre> 94<table class="docutils field-list" frame="void" rules="none"> 95<col class="field-name" /> 96<col class="field-body" /> 97<tbody valign="top"> 98<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p> 99</td> 100</tr> 101<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 102<pre class="last literal-block"> 103struct r : <a href="./negate.html" class="identifier">negate</a><c>::type {}; 104</pre> 105</td> 106</tr> 107</tbody> 108</table> 109</div> 110<div class="section" id="id1011"> 111<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 112<p>Amortized constant time.</p> 113</div> 114<div class="section" id="id1012"> 115<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 116<pre class="literal-block"> 117typedef <a href="./negate.html" class="identifier">negate</a>< <a href="./int.html" class="identifier">int_</a><-10> >::type r; 118<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r::value, ==, 10 ); 119<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r::<a href="./value-type.html" class="identifier">value_type</a>, int > )); 120</pre> 121</div> 122<div class="section" id="id1013"> 123<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 124<p><a class="reference internal" href="./arithmetic-operations.html">Arithmetic Operations</a>, <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a>, <a class="reference internal" href="./numeric-cast.html">numeric_cast</a>, <a class="reference internal" href="./plus.html">plus</a>, <a class="reference internal" href="./minus.html">minus</a>, <a class="reference internal" href="./times.html">times</a></p> 125</div> 126</div> 127 128<div class="footer-separator"></div> 129<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./modulus.html" class="navigation-link">Prev</a> <a href="./comparisons.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./modulus.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./arithmetic-operations.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> 130<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 131Distributed under the Boost Software License, Version 1.0. (See accompanying 132file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> 133</html> 134