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- <title>The MPL Reference Manual: BOOST_MPL_ASSERT_RELATION</title>
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- <div class="section" id="boost-mpl-assert-relation">
- <h1><a class="toc-backref" href="./asserts.html#id1591">BOOST_MPL_ASSERT_RELATION</a></h1>
- <div class="section" id="id1308">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- #define <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( x, relation, y ) \
- <em>unspecified token sequence</em> \
- /**/
- </pre>
- </div>
- <div class="section" id="id1309">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>A specialized assertion macro for checking numerical conditions. Generates
- a compilation error when the condition <tt class="literal"><span class="pre">(</span> <span class="pre">x</span> <span class="pre">relation</span> <span class="pre">y</span> <span class="pre">)</span></tt>
- doesn't hold.</p>
- </div>
- <div class="section" id="id1310">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/assert.hpp" class="header">boost/mpl/assert.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id1311">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="15%" />
- <col width="36%" />
- <col width="48%" />
- </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">x</span></tt></td>
- <td>An integral constant</td>
- <td>Left operand of the checked relation.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">y</span></tt></td>
- <td>An integral constant</td>
- <td>Right operand of the checked relation.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">relation</span></tt></td>
- <td>A C++ operator token</td>
- <td>An operator token for the relation being
- checked.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1312">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>For any integral constants <tt class="literal"><span class="pre">x</span></tt>, <tt class="literal"><span class="pre">y</span></tt> and a legal C++ operator token <tt class="literal"><span class="pre">op</span></tt>:</p>
- <pre class="literal-block">
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( x, op, y );
- </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">None.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Generates a compilation error if <tt class="literal"><span class="pre">(</span> <span class="pre">x</span> <span class="pre">op</span> <span class="pre">y</span> <span class="pre">)</span> <span class="pre">!=</span> <span class="pre">true</span></tt>, otherwise
- has no effect.</p>
- <p>When possible within the compiler's diagnostic capabilities,
- the error message will include a name of the relation being checked,
- the actual values of both operands, and have a general form of:</p>
- <pre class="last literal-block">
- <em>...</em> ************<em>...</em>assert_relation<op, x, y>::************) <em>...</em>
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1313">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- template< typename T, typename U > struct my
- {
- // ...
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( sizeof(T), <, sizeof(U) );
- };
- my<char[50],char[10]> test;
- // In instantiation of `my<char[50], char[10]>':
- // instantiated from here
- // conversion from `
- // mpl_::failed************mpl_::assert_relation<<a href="./less.html" class="identifier">less</a>, 50, 10>::************'
- // to non-scalar type `mpl_::assert<false>' requested
- </pre>
- </div>
- <div class="section" id="id1314">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./asserts.html">Asserts</a>, <a class="reference internal" href="./assert.html">BOOST_MPL_ASSERT</a>, <a class="reference internal" href="./assert-not.html">BOOST_MPL_ASSERT_NOT</a>, <a class="reference internal" href="./assert-msg.html">BOOST_MPL_ASSERT_MSG</a></p>
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