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| <title>The MPL Reference Manual: advance</title> |
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| <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./iterators.html" class="navigation-link">Iterators</a> / <a href="./iterator-metafunctions.html" class="navigation-link">Iterator Metafunctions</a> / <a href="./advance.html" class="navigation-link">advance</a></td> |
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| <div class="section" id="advance"> |
| <h1><a class="toc-backref" href="./iterator-metafunctions.html#id1454">advance</a></h1> |
| <div class="section" id="id403"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename Iterator |
| , typename N |
| > |
| struct <a href="./advance.html" class="identifier">advance</a> |
| { |
| typedef <em>unspecified</em> type; |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id404"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>Moves <tt class="literal"><span class="pre">Iterator</span></tt> by the distance <tt class="literal"><span class="pre">N</span></tt>. For <a class="reference internal" href="./bidirectional-iterator.html">bidirectional</a> and |
| <a class="reference internal" href="./random-access-iterator.html">random access</a> iterators, the distance may be negative.</p> |
| </div> |
| <div class="section" id="id405"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/advance.hpp" class="header">boost/mpl/advance.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id406"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="19%" /> |
| <col width="35%" /> |
| <col width="45%" /> |
| </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">Iterator</span></tt></td> |
| <td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td> |
| <td>An iterator to advance.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">N</span></tt></td> |
| <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> |
| <td>A distance.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id407"> |
| <h3><a class="subsection-title" href="#model-of" name="model-of">Model Of</a></h3> |
| <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p> |
| </div> |
| <div class="section" id="id408"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <p>For a <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a> <tt class="literal"><span class="pre">iter</span></tt> and arbitrary <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">n</span></tt>:</p> |
| <pre class="literal-block"> |
| typedef <a href="./advance.html" class="identifier">advance</a><iter,n>::type j; |
| </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="./forward-iterator.html">Forward Iterator</a>.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first">If <tt class="literal"><span class="pre">Iterator</span></tt> is a <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>, <tt class="literal"><span class="pre">n::value</span></tt> must be nonnegative.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to:</p> |
| <pre class="literal-block"> |
| typedef iter i0; |
| typedef <a href="./next.html" class="identifier">next</a><i0>::type i1; |
| <em>...</em> |
| typedef <a href="./next.html" class="identifier">next</a><i<em>n-1</em>>::type j; |
| </pre> |
| <p>if <tt class="literal"><span class="pre">n::value</span> <span class="pre">></span> <span class="pre">0</span></tt>, and</p> |
| <pre class="literal-block"> |
| typedef iter i0; |
| typedef <a href="./prior.html" class="identifier">prior</a><i0>::type i1; |
| <em>...</em> |
| typedef <a href="./prior.html" class="identifier">prior</a><i<em>n-1</em>>::type j; |
| </pre> |
| <p>otherwise.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first last"><tt class="literal"><span class="pre">j</span></tt> is dereferenceable or past-the-end; |
| <tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a><iter,j>::value</span> <span class="pre">==</span> <span class="pre">n::value</span></tt> if <tt class="literal"><span class="pre">n::value</span> <span class="pre">></span> <span class="pre">0</span></tt>, and |
| <tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a><j,iter>::value</span> <span class="pre">==</span> <span class="pre">n::value</span></tt> otherwise.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id409"> |
| <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
| <p>Amortized constant time if <tt class="literal"><span class="pre">iter</span></tt> is a model of |
| <a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a>, otherwise linear time.</p> |
| </div> |
| <div class="section" id="id410"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| typedef <a href="./range-c.html" class="identifier">range_c</a><int,0,10> numbers; |
| typedef <a href="./begin.html" class="identifier">begin</a><numbers>::type first; |
| typedef <a href="./end.html" class="identifier">end</a><numbers>::type last; |
| |
| typedef <a href="./advance.html" class="identifier">advance</a><first,<a href="./int.html" class="identifier">int_</a><10> >::type i1; |
| typedef <a href="./advance.html" class="identifier">advance</a><last,<a href="./int.html" class="identifier">int_</a><-10> >::type i2; |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( boost::is_same<i1,last> )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( boost::is_same<i2,first> )); |
| </pre> |
| </div> |
| <div class="section" id="id411"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./iterators.html">Iterators</a>, <a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a>, <a class="reference internal" href="./distance.html">distance</a>, <a class="reference internal" href="./next.html">next</a></p> |
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