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| <title>The MPL Reference Manual: plus</title> |
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| <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> |
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| <div class="section" id="plus"> |
| <h1><a class="toc-backref" href="./arithmetic-operations.html#id1536">plus</a></h1> |
| <div class="section" id="id960"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename T1 |
| , typename T2 |
| , typename T3 = <em>unspecified</em> |
| <em>...</em> |
| , typename T<em>n</em> = <em>unspecified</em> |
| > |
| struct <a href="./plus.html" class="identifier">plus</a> |
| { |
| typedef <em>unspecified</em> type; |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id961"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>Returns the sum of its arguments.</p> |
| </div> |
| <div class="section" id="id962"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/plus.hpp" class="header">boost/mpl/plus.hpp</a>> |
| #include <<a href="../../../../boost/mpl/arithmetic.hpp" class="header">boost/mpl/arithmetic.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id963"> |
| <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> |
| <p><a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a></p> |
| </div> |
| <div class="section" id="id964"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="17%" /> |
| <col width="30%" /> |
| <col width="53%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Parameter</th> |
| <th class="head">Requirement</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <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> |
| <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> |
| <td>Operation's arguments.</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>[<em>Note:</em> The requirements listed in this specification |
| are the ones imposed by the default implementation. See <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a> concept |
| for the details on how to provide an implementation for a user-defined numeric type |
| that does not satisfy the <a class="reference internal" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p> |
| </div> |
| <div class="section" id="id965"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <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> |
| <pre class="literal-block"> |
| typedef <a href="./plus.html" class="identifier">plus</a><c1,<em>...</em>c<em>n</em>>::type r; |
| </pre> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <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> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> |
| <pre class="last literal-block"> |
| typedef <a href="./integral-c.html" class="identifier">integral_c</a>< |
| typeof(c1::value + c2::value) |
| , ( c1::value + c2::value ) |
| > c; |
| |
| typedef <a href="./plus.html" class="identifier">plus</a><c,c3,<em>...</em>c<em>n</em>>::type r; |
| </pre> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <!-- .......................................................................... --> |
| <pre class="literal-block"> |
| typedef <a href="./plus.html" class="identifier">plus</a><c1,<em>...</em>c<em>n</em>> r; |
| </pre> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <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> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> |
| <pre class="last literal-block"> |
| struct r : <a href="./plus.html" class="identifier">plus</a><c1,<em>...</em>c<em>n</em>>::type {}; |
| </pre> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id966"> |
| <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
| <p>Amortized constant time.</p> |
| </div> |
| <div class="section" id="id967"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| typedef <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; |
| <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( r::value, ==, -6 ); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r::<a href="./value-type.html" class="identifier">value_type</a>, long > )); |
| </pre> |
| </div> |
| <div class="section" id="id968"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <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> |
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