mirror of
https://github.com/boostorg/fusion.git
synced 2025-07-14 21:06:40 +02:00
fix for #2355: discrepancy between std::accumulate and fusion::accumulate
[SVN r57125]
This commit is contained in:
Christopher Schmidt
@ -3,7 +3,7 @@
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>accumulate</title>
|
||||
<link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.75.0">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.75.1">
|
||||
<link rel="home" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
|
||||
<link rel="up" href="../functions.html" title="Functions">
|
||||
<link rel="prev" href="fold.html" title="fold">
|
||||
@ -27,18 +27,21 @@
|
||||
<a name="fusion.algorithm.iteration.functions.accumulate"></a><a class="link" href="accumulate.html" title="accumulate">accumulate</a>
|
||||
</h5></div></div></div>
|
||||
<a name="fusion.algorithm.iteration.functions.accumulate.description"></a><h6>
|
||||
<a name="id672561"></a>
|
||||
<a name="id789366"></a>
|
||||
<a class="link" href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.description">Description</a>
|
||||
</h6>
|
||||
<p>
|
||||
For a sequence <code class="computeroutput"><span class="identifier">Seq</span></code>, initial
|
||||
state, and binary function object or function pointer <code class="computeroutput"><span class="identifier">f</span></code>,
|
||||
accumulate repeatedly applies binary <code class="computeroutput"><span class="identifier">f</span></code>
|
||||
to each element of <code class="computeroutput"><span class="identifier">Seq</span></code>
|
||||
and the previous state.
|
||||
For a sequence <code class="computeroutput"><span class="identifier">seq</span></code>, initial
|
||||
state <code class="computeroutput"><span class="identifier">initial_state</span></code>,
|
||||
and binary function object or function pointer <code class="computeroutput"><span class="identifier">f</span></code>,
|
||||
accumulate returns the result of the repeated application of binary
|
||||
<code class="computeroutput"><span class="identifier">f</span></code> to the result of the
|
||||
previous <code class="computeroutput"><span class="identifier">f</span></code> invocation
|
||||
(<code class="computeroutput"><span class="identifier">inital_state</span></code> if it is
|
||||
the first call) and each element of <code class="computeroutput"><span class="identifier">seq</span></code>.
|
||||
</p>
|
||||
<a name="fusion.algorithm.iteration.functions.accumulate.synopsis"></a><h6>
|
||||
<a name="id672611"></a>
|
||||
<a name="id789441"></a>
|
||||
<a class="link" href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.synopsis">Synopsis</a>
|
||||
</h6>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
|
||||
@ -50,7 +53,7 @@
|
||||
<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>
|
||||
</pre>
|
||||
<div class="table">
|
||||
<a name="id672797"></a><p class="title"><b>Table<EFBFBD>1.34.<2E>Parameters</b></p>
|
||||
<a name="id789627"></a><p class="title"><b>Table<EFBFBD>1.34.<2E>Parameters</b></p>
|
||||
<div class="table-contents"><table class="table" summary="Parameters">
|
||||
<colgroup>
|
||||
<col>
|
||||
@ -84,10 +87,10 @@
|
||||
<td>
|
||||
<p>
|
||||
A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
|
||||
Sequence</a>, <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> must be a valid expression for
|
||||
each element <code class="computeroutput"><span class="identifier">e1</span></code>
|
||||
to <code class="computeroutput"><span class="identifier">eN</span></code> in <code class="computeroutput"><span class="identifier">seq</span></code>
|
||||
Sequence</a>, <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span><span class="identifier">e</span><span class="special">)</span></code> must be a valid expression for
|
||||
current state <code class="computeroutput"><span class="identifier">s</span></code>,
|
||||
and each element <code class="computeroutput"><span class="identifier">e</span></code>
|
||||
in <code class="computeroutput"><span class="identifier">seq</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
@ -121,9 +124,11 @@
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
<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>
|
||||
<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">S</span><span class="special">,</span><span class="identifier">E</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">s</span><span class="special">,</span><span class="identifier">e</span><span class="special">)</span></code>
|
||||
current state <code class="computeroutput"><span class="identifier">s</span></code>
|
||||
of type <code class="computeroutput"><span class="identifier">S</span></code>, and
|
||||
for each element <code class="computeroutput"><span class="identifier">e</span></code>
|
||||
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>
|
||||
of type <code class="computeroutput"><span class="identifier">E</span></code> in <code class="computeroutput"><span class="identifier">seq</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
@ -136,7 +141,7 @@
|
||||
</table></div>
|
||||
</div>
|
||||
<br class="table-break"><a name="fusion.algorithm.iteration.functions.accumulate.expression_semantics"></a><h6>
|
||||
<a name="id675325"></a>
|
||||
<a name="id790473"></a>
|
||||
<a class="link" href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.expression_semantics">Expression
|
||||
Semantics</a>
|
||||
</h6>
|
||||
@ -146,25 +151,26 @@
|
||||
<span class="bold"><strong>Return type</strong></span>: Any type
|
||||
</p>
|
||||
<p>
|
||||
<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>
|
||||
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>.
|
||||
<span class="bold"><strong>Semantics</strong></span>: Equivalent to <code class="computeroutput"><span class="identifier">f</span><span class="special">(...</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">initial_state</span><span class="special">,</span><span class="identifier">e1</span><span class="special">),</span><span class="identifier">e2</span><span class="special">)</span> <span class="special">...</span><span class="identifier">eN</span><span class="special">)</span></code> 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>.
|
||||
</p>
|
||||
<a name="fusion.algorithm.iteration.functions.accumulate.complexity"></a><h6>
|
||||
<a name="id675471"></a>
|
||||
<a name="id790624"></a>
|
||||
<a class="link" href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.complexity">Complexity</a>
|
||||
</h6>
|
||||
<p>
|
||||
Linear, exactly <code class="computeroutput"><a class="link" 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>.
|
||||
</p>
|
||||
<a name="fusion.algorithm.iteration.functions.accumulate.header"></a><h6>
|
||||
<a name="id675531"></a>
|
||||
<a name="id790684"></a>
|
||||
<a class="link" href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.header">Header</a>
|
||||
</h6>
|
||||
<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>
|
||||
<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>
|
||||
</pre>
|
||||
<a name="fusion.algorithm.iteration.functions.accumulate.example"></a><h6>
|
||||
<a name="id675646"></a>
|
||||
<a name="id790800"></a>
|
||||
<a class="link" href="accumulate.html#fusion.algorithm.iteration.functions.accumulate.example">Example</a>
|
||||
</h6>
|
||||
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">make_string</span>
|
||||
@ -172,7 +178,7 @@
|
||||
<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>
|
||||
|
||||
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
|
||||
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&</span> <span class="identifier">t</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">str</span><span class="special">)</span> <span class="keyword">const</span>
|
||||
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">str</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">T</span><span class="special">&</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="identifier">str</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">lexical_cast</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="identifier">t</span><span class="special">);</span>
|
||||
<span class="special">}</span>
|
||||
|
||||
Reference in New Issue
Block a user