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- <div class="section" id="prior">
- <h1><a class="toc-backref" href="./iterator-metafunctions.html#id1457">prior</a></h1>
- <div class="section" id="id429">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Iterator
- >
- struct <a href="./prior.html" class="identifier">prior</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id430">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns the previous iterator in the sequence. [<em>Note:</em> <tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a></span></tt> has a number of
- overloaded meanings, depending on the type of its argument. For instance,
- if <tt class="literal"><span class="pre">X</span></tt> is an <a class="reference internal" href="./integral-constant.html">Integral Constant</a>, <tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><X></span></tt> returns an decremented
- <a class="reference internal" href="./integral-constant.html">Integral Constant</a> of the same type. The following specification is
- iterator-specific. Please refer to the corresponding concept's
- documentation for the details of the alternative semantics — <em>end note</em>].</p>
- </div>
- <div class="section" id="id431">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/next_prior.hpp" class="header">boost/mpl/next_prior.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id432">
- <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="./bidirectional-iterator.html">Bidirectional Iterator</a>.</td>
- <td>An iterator to decrement.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id433">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>For any <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>s <tt class="literal"><span class="pre">iter</span></tt>:</p>
- <pre class="literal-block">
- typedef <a href="./prior.html" class="identifier">prior</a><iter>::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="./bidirectional-iterator.html">Bidirectional Iterator</a>.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">iter</span></tt> is decrementable.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">j</span></tt> is an iterator pointing to the previous element in the sequence.
- If <tt class="literal"><span class="pre">iter</span></tt> is a user-defined iterator, the library-provided default
- implementation is equivalent to</p>
- <pre class="last literal-block">
- typedef iter::<a href="./prior.html" class="identifier">prior</a> j;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id434">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Amortized constant time.</p>
- </div>
- <div class="section" id="id435">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,1> v;
- typedef <a href="./begin.html" class="identifier">begin</a><v>::type first;
- typedef <a href="./end.html" class="identifier">end</a><v>::type last;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./prior.html" class="identifier">prior</a><last>::type, first > ));
- </pre>
- </div>
- <div class="section" id="id436">
- <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="./begin.html">begin</a> / <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./next.html">next</a>, <a class="reference internal" href="./deref.html">deref</a></p>
- <!-- Iterators/Iterator Metafunctions//deref |50 -->
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