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boost_fusion/doc/html/fusion/iterator/functions/prior.html
Christopher Schmidt 35e469e2d5 fix for #2355: discrepancy between std::accumulate and fusion::accumulate 
[SVN r57125]
2009-10-24 10:59:01 +00:00

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<div class="section" title="prior">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.prior"></a><a class="link" href="prior.html" title="prior">prior</a>
</h4></div></div></div>
<a name="fusion.iterator.functions.prior.description"></a><h6>
<a name="id680290"></a>
<a class="link" href="prior.html#fusion.iterator.functions.prior.description">Description</a>
</h6>
<p>
Moves an iterator 1 position backwards.
</p>
<a name="fusion.iterator.functions.prior.synopsis"></a><h6>
<a name="id680308"></a>
<a class="link" href="prior.html#fusion.iterator.functions.prior.synopsis">Synopsis</a>
</h6>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a class="link" href="../metafunctions/prior.html" title="prior"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></code></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">prior</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id680955"></a><p class="title"><b>Table 1.4. Parameters</b></p>
<div class="table-contents"><table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">i</span></code>
</p>
</td>
<td>
<p>
Model of <a class="link" href="../concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table></div>
</div>
<br class="table-break"><a name="fusion.iterator.functions.prior.expression_semantics"></a><h6>
<a name="id681037"></a>
<a class="link" href="prior.html#fusion.iterator.functions.prior.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting"><a class="link" href="prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Return type</strong></span>: A model of the same iterator
concept as <code class="computeroutput"><span class="identifier">i</span></code>.
</p>
<p>
<span class="bold"><strong>Semantics</strong></span>: Returns an iterator to the
element prior to <code class="computeroutput"><span class="identifier">i</span></code>.
</p>
<a name="fusion.iterator.functions.prior.header"></a><h6>
<a name="id681107"></a>
<a class="link" href="prior.html#fusion.iterator.functions.prior.header">Header</a>
</h6>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">prior</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">prior</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterator.functions.prior.example"></a><h6>
<a name="id681215"></a>
<a class="link" href="prior.html#fusion.iterator.functions.prior.example">Example</a>
</h6>
<pre class="programlisting"><span class="keyword">typedef</span> <a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a class="link" href="deref.html" title="deref"><code class="computeroutput"><span class="identifier">deref</span></code></a><span class="special">(</span><a class="link" href="next.html" title="next"><code class="computeroutput"><span class="identifier">next</span></code></a><span class="special">(</span><a class="link" href="../../sequence/intrinsic/functions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">begin</span></code></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a class="link" href="deref.html" title="deref"><code class="computeroutput"><span class="identifier">deref</span></code></a><span class="special">(</span><a class="link" href="prior.html" title="prior"><code class="computeroutput"><span class="identifier">prior</span></code></a><span class="special">(</span><a class="link" href="next.html" title="next"><code class="computeroutput"><span class="identifier">next</span></code></a><span class="special">(</span><a class="link" href="../../sequence/intrinsic/functions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">begin</span></code></a><span class="special">(</span><span class="identifier">v</span><span class="special">))))</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
</pre>
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