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: plus</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="./arithmetic-operations.html" class="navigation-link">Prev</a> <a href="./minus.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./minus.html" class="navigation-link">Along</a></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="./plus.html" class="navigation-link">plus</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="plus"> 15<h1><a class="toc-backref" href="./arithmetic-operations.html#id1536">plus</a></h1> 16<div class="section" id="id960"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename T1 21 , typename T2 22 , typename T3 = <em>unspecified</em> 23 <em>...</em> 24 , typename T<em>n</em> = <em>unspecified</em> 25 > 26struct <a href="./plus.html" class="identifier">plus</a> 27{ 28 typedef <em>unspecified</em> type; 29}; 30</pre> 31</div> 32<div class="section" id="id961"> 33<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 34<p>Returns the sum of its arguments.</p> 35</div> 36<div class="section" id="id962"> 37<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 38<pre class="literal-block"> 39#include <<a href="../../../../boost/mpl/plus.hpp" class="header">boost/mpl/plus.hpp</a>> 40#include <<a href="../../../../boost/mpl/arithmetic.hpp" class="header">boost/mpl/arithmetic.hpp</a>> 41</pre> 42</div> 43<div class="section" id="id963"> 44<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 45<p><a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a></p> 46</div> 47<div class="section" id="id964"> 48<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 49<table border="1" class="docutils table"> 50<colgroup> 51<col width="17%" /> 52<col width="30%" /> 53<col width="53%" /> 54</colgroup> 55<thead valign="bottom"> 56<tr><th class="head">Parameter</th> 57<th class="head">Requirement</th> 58<th class="head">Description</th> 59</tr> 60</thead> 61<tbody valign="top"> 62<tr><td><tt class="literal"><span class="pre">T1</span></tt>, <tt class="literal"><span class="pre">T2</span></tt>,... <tt class="literal"><span class="pre">Tn</span></tt></td> 63<td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> 64<td>Operation's arguments.</td> 65</tr> 66</tbody> 67</table> 68<p>[<em>Note:</em> The requirements listed in this specification 69are the ones imposed by the default implementation. See <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a> concept 70for the details on how to provide an implementation for a user-defined numeric type 71that does not satisfy the <a class="reference internal" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p> 72</div> 73<div class="section" id="id965"> 74<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 75<p>For any <a class="reference internal" href="./integral-constant.html">Integral Constant</a>s <em>c</em><sub>1</sub>,<em>c</em><sub>2</sub>,... <em>c</em><sub>n</sub>:</p> 76<pre class="literal-block"> 77typedef <a href="./plus.html" class="identifier">plus</a><c1,<em>...</em>c<em>n</em>>::type r; 78</pre> 79<table class="docutils field-list" frame="void" rules="none"> 80<col class="field-name" /> 81<col class="field-body" /> 82<tbody valign="top"> 83<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> 84</td> 85</tr> 86<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 87<pre class="last literal-block"> 88typedef <a href="./integral-c.html" class="identifier">integral_c</a>< 89 typeof(c1::value + c2::value) 90 , ( c1::value + c2::value ) 91 > c; 92 93typedef <a href="./plus.html" class="identifier">plus</a><c,c3,<em>...</em>c<em>n</em>>::type r; 94</pre> 95</td> 96</tr> 97</tbody> 98</table> 99<!-- .......................................................................... --> 100<pre class="literal-block"> 101typedef <a href="./plus.html" class="identifier">plus</a><c1,<em>...</em>c<em>n</em>> r; 102</pre> 103<table class="docutils field-list" frame="void" rules="none"> 104<col class="field-name" /> 105<col class="field-body" /> 106<tbody valign="top"> 107<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> 108</td> 109</tr> 110<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 111<pre class="last literal-block"> 112struct r : <a href="./plus.html" class="identifier">plus</a><c1,<em>...</em>c<em>n</em>>::type {}; 113</pre> 114</td> 115</tr> 116</tbody> 117</table> 118</div> 119<div class="section" id="id966"> 120<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 121<p>Amortized constant time.</p> 122</div> 123<div class="section" id="id967"> 124<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 125<pre class="literal-block"> 126typedef <a href="./plus.html" class="identifier">plus</a>< <a href="./int.html" class="identifier">int_</a><-10>, <a href="./int.html" class="identifier">int_</a><3>, <a href="./long.html" class="identifier">long_</a><1> >::type r; 127<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r::value, ==, -6 ); 128<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r::<a href="./value-type.html" class="identifier">value_type</a>, long > )); 129</pre> 130</div> 131<div class="section" id="id968"> 132<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 133<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="./minus.html">minus</a>, <a class="reference internal" href="./negate.html">negate</a>, <a class="reference internal" href="./times.html">times</a></p> 134<!-- Metafunctions/Arithmetic Operations//minus |20 --> 135</div> 136</div> 137 138<div class="footer-separator"></div> 139<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./arithmetic-operations.html" class="navigation-link">Prev</a> <a href="./minus.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./minus.html" class="navigation-link">Along</a></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> 140<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 141Distributed under the Boost Software License, Version 1.0. (See accompanying 142file 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> 143</html> 144