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| <title>The MPL Reference Manual: Integral Constant</title> |
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| <div class="section" id="integral-constant"> |
| <h1><a class="toc-backref" href="./data-types-concepts.html#id1574">Integral Constant</a></h1> |
| <div class="section" id="id1217"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>An <a class="reference internal" href="./integral-constant.html">Integral Constant</a> is a holder class for a compile-time value of an |
| integral type. Every <a class="reference internal" href="./integral-constant.html">Integral Constant</a> is also a nullary <a class="reference internal" href="./metafunction.html">Metafunction</a>, |
| returning itself. An integral constant <em>object</em> is implicitly convertible to the |
| corresponding run-time value of the wrapped integral type.</p> |
| </div> |
| <div class="section" id="id1218"> |
| <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> |
| <p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">n</span></tt> is a model of <a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="35%" /> |
| <col width="39%" /> |
| <col width="27%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Expression</th> |
| <th class="head">Type</th> |
| <th class="head">Complexity</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre">n::tag</span></tt></td> |
| <td><tt class="literal"><span class="pre">integral_c_tag</span></tt></td> |
| <td>Constant time.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt></td> |
| <td>An integral type</td> |
| <td>Constant time.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::value</span></tt></td> |
| <td>An integral constant expression</td> |
| <td>Constant time.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::type</span></tt></td> |
| <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> |
| <td>Constant time.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a><n>::type</span></tt></td> |
| <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> |
| <td>Constant time.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><n>::type</span></tt></td> |
| <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> |
| <td>Constant time.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span> <span class="pre">const</span> <span class="pre">c</span> <span class="pre">=</span> <span class="pre">n()</span></tt></td> |
| <td> </td> |
| <td>Constant time.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id1219"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="40%" /> |
| <col width="60%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Expression</th> |
| <th class="head">Semantics</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre">n::tag</span></tt></td> |
| <td><tt class="literal"><span class="pre">n</span></tt>'s tag type; <tt class="literal"><span class="pre">n::tag::value</span></tt> is <tt class="literal"><span class="pre">n</span></tt>'s |
| <em>conversion rank</em>.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt></td> |
| <td>A cv-unqualified type of <tt class="literal"><span class="pre">n::value</span></tt>.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::value</span></tt></td> |
| <td>The value of the wrapped integral constant.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::type</span></tt></td> |
| <td><tt class="literal"><span class="pre">is_same<n::type,n>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a><n>::type</span></tt></td> |
| <td>An <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> of type <tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt> |
| such that <tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">n::value</span> <span class="pre">+</span> <span class="pre">1</span></tt>.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><n>::type</span></tt></td> |
| <td>An <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> of type <tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt> |
| such that <tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">n::value</span> <span class="pre">-</span> <span class="pre">1</span></tt>.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span> <span class="pre">const</span> <span class="pre">c</span> <span class="pre">=</span> <span class="pre">n()</span></tt></td> |
| <td><tt class="literal"><span class="pre">c</span> <span class="pre">==</span> <span class="pre">n::value</span></tt>.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id1220"> |
| <h3><a class="subsection-title" href="#models" name="models">Models</a></h3> |
| <ul class="simple"> |
| <li><a class="reference internal" href="./bool.html">bool_</a></li> |
| <li><a class="reference internal" href="./int.html">int_</a></li> |
| <li><a class="reference internal" href="./long.html">long_</a></li> |
| <li><a class="reference internal" href="./char.html">char_</a></li> |
| <li><a class="reference internal" href="./integral-c.html">integral_c</a></li> |
| </ul> |
| </div> |
| <div class="section" id="id1221"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./data-types.html">Data Types</a>, <a class="reference internal" href="./integral-sequence-wrapper.html">Integral Sequence Wrapper</a>, <a class="reference internal" href="./integral-c.html">integral_c</a></p> |
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| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file 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> |
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