mirror of
https://github.com/boostorg/fusion.git
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updates functional module: only two unfused variants, now
[SVN r51381]
This commit is contained in:
Tobias Schwinger
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>accumulate</title>
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<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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<link rel="up" href="../functions.html" title="Functions">
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.algorithm.iteration.functions.accumulate"></a><a href="accumulate.html" title="accumulate">accumulate</a></h5></div></div></div>
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<a name="fusion.algorithm.iteration.functions.accumulate.description"></a><h6>
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<a name="id581185"></a>
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<a name="id1150181"></a>
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<a href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.description">Description</a>
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</h6>
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<p>
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For a sequence <tt class="computeroutput"><span class="identifier">Seq</span></tt>, initial
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state, and binary function object or function pointer <tt class="computeroutput"><span class="identifier">f</span></tt>,
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accumulate repeatedly applies binary <tt class="computeroutput"><span class="identifier">f</span></tt>
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to each element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>
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For a sequence <code class="computeroutput"><span class="identifier">Seq</span></code>, initial
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state, and binary function object or function pointer <code class="computeroutput"><span class="identifier">f</span></code>,
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accumulate repeatedly applies binary <code class="computeroutput"><span class="identifier">f</span></code>
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to each element of <code class="computeroutput"><span class="identifier">Seq</span></code>
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and the previous state.
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</p>
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<a name="fusion.algorithm.iteration.functions.accumulate.synopsis"></a><h6>
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<a name="id581264"></a>
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<a name="id1150252"></a>
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<a href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.synopsis">Synopsis</a>
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</h6>
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<pre class="programlisting">
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<span class="keyword">template</span><span class="special"><</span>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">State</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">F</span>
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<span class="special">></span>
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<span class="keyword">typename</span> <a href="../metafunctions/accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">accumulate</span></tt></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">accumulate</span><span class="special">(</span>
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<span class="keyword">typename</span> <a href="../metafunctions/accumulate.html" title="accumulate"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">accumulate</span></code></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">accumulate</span><span class="special">(</span>
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<span class="identifier">Sequence</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">State</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">F</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">f</span><span class="special">);</span>
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</pre>
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<div class="table">
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<a name="id581526"></a><p class="title"><b>Table<EFBFBD>1.34.<2E>Parameters</b></p>
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<a name="id1150480"></a><p class="title"><b>Table<EFBFBD>1.34.<2E>Parameters</b></p>
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<table class="table" summary="Parameters">
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<colgroup>
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<col>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">seq</span></tt>
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<code class="computeroutput"><span class="identifier">seq</span></code>
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</p>
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</td>
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<td>
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<p>
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A model of <a href="../../../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span>
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<span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt> must be a valid expression for
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each element <tt class="computeroutput"><span class="identifier">e1</span></tt>
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to <tt class="computeroutput"><span class="identifier">eN</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
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Sequence</a>, <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span>
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<span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></code> must be a valid expression for
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each element <code class="computeroutput"><span class="identifier">e1</span></code>
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to <code class="computeroutput"><span class="identifier">eN</span></code> in <code class="computeroutput"><span class="identifier">seq</span></code>
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</p>
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</td>
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<td>
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@ -100,7 +99,7 @@
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">initial_state</span></tt>
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<code class="computeroutput"><span class="identifier">initial_state</span></code>
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</p>
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</td>
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<td>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">f</span></tt>
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<code class="computeroutput"><span class="identifier">f</span></code>
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</p>
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</td>
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<td>
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<p>
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<tt class="computeroutput"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></tt></a><span class="special"><</span><span class="identifier">F</span><span class="special">(</span><span class="identifier">E</span><span class="special">,</span><span class="identifier">S</span><span class="special">)>::</span><span class="identifier">type</span></tt> is the return type of <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">,</span><span class="identifier">s</span><span class="special">)</span></tt>
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for each element <tt class="computeroutput"><span class="identifier">e</span></tt>
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of type <tt class="computeroutput"><span class="identifier">E</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>, and current state <tt class="computeroutput"><span class="identifier">s</span></tt> of type <tt class="computeroutput"><span class="identifier">S</span></tt>
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<code class="computeroutput"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></code></a><span class="special"><</span><span class="identifier">F</span><span class="special">(</span><span class="identifier">E</span><span class="special">,</span><span class="identifier">S</span><span class="special">)>::</span><span class="identifier">type</span></code> is the return type of <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">,</span><span class="identifier">s</span><span class="special">)</span></code>
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for each element <code class="computeroutput"><span class="identifier">e</span></code>
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of type <code class="computeroutput"><span class="identifier">E</span></code> in <code class="computeroutput"><span class="identifier">seq</span></code>, and current state <code class="computeroutput"><span class="identifier">s</span></code> of type <code class="computeroutput"><span class="identifier">S</span></code>
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</p>
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</td>
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<td>
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</table>
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</div>
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<a name="fusion.algorithm.iteration.functions.accumulate.expression_semantics"></a><h6>
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<a name="id581977"></a>
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<a name="id1150879"></a>
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<a href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.expression_semantics">Expression
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Semantics</a>
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</h6>
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<pre class="programlisting">
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<span class="identifier">accumulate</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
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<pre class="programlisting"><span class="identifier">accumulate</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
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</pre>
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<p>
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<span class="bold"><b>Return type</b></span>: Any type
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<span class="bold"><strong>Return type</strong></span>: Any type
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Equivalent to <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span> <span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt>
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where <tt class="computeroutput"><span class="identifier">e1</span> <span class="special">...</span><span class="identifier">eN</span></tt> are the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
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<span class="bold"><strong>Semantics</strong></span>: Equivalent to <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span> <span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></code>
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where <code class="computeroutput"><span class="identifier">e1</span> <span class="special">...</span><span class="identifier">eN</span></code> are the elements of <code class="computeroutput"><span class="identifier">seq</span></code>.
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</p>
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<a name="fusion.algorithm.iteration.functions.accumulate.complexity"></a><h6>
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<a name="id582188"></a>
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<a name="id1151063"></a>
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<a href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.complexity">Complexity</a>
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</h6>
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<p>
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Linear, exactly <tt class="computeroutput"><a href="../../../sequence/intrinsic/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">value</span></tt> applications of <tt class="computeroutput"><span class="identifier">f</span></tt>.
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Linear, exactly <code class="computeroutput"><a href="../../../sequence/intrinsic/metafunctions/size.html" title="size"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></code></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">value</span></code> applications of <code class="computeroutput"><span class="identifier">f</span></code>.
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</p>
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<a name="fusion.algorithm.iteration.functions.accumulate.header"></a><h6>
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<a name="id582284"></a>
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<a name="id1151147"></a>
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<a href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.header">Header</a>
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</h6>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">accumulate</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">iteration</span><span class="special">/</span><span class="identifier">accumulate</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</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">accumulate</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<a name="fusion.algorithm.iteration.functions.accumulate.example"></a><h6>
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<a name="id582454"></a>
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<a name="id1151296"></a>
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<a href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.example">Example</a>
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</h6>
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<pre class="programlisting">
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<span class="keyword">struct</span> <span class="identifier">make_string</span>
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<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">make_string</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">result_type</span><span class="special">;</span>
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<span class="special">}</span>
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<span class="special">};</span>
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<span class="special">...</span>
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<span class="keyword">const</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
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<span class="identifier">assert</span><span class="special">(</span><a href="accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">accumulate</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">""</span><span class="special">),</span> <span class="identifier">make_string</span><span class="special">())</span> <span class="special">==</span> <span class="string">"12"</span><span class="special">);</span>
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<span class="keyword">const</span> <a href="../../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
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<span class="identifier">assert</span><span class="special">(</span><a href="accumulate.html" title="accumulate"><code class="computeroutput"><span class="identifier">accumulate</span></code></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">""</span><span class="special">),</span> <span class="identifier">make_string</span><span class="special">())</span> <span class="special">==</span> <span class="string">"12"</span><span class="special">);</span>
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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