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update for trac #1893

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[SVN r53856]
This commit is contained in:
Joel de Guzman
2009-06-13 06:29:32 +00:00
parent dace0940b7
commit 916077ce6b
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doc/html/fusion/sequence/intrinsic/functions/front.html
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@ -3,10 +3,10 @@
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>front</title>
<link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.68.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<meta name="generator" content="DocBook XSL Stylesheets V1.65.1">
<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="empty.html" title="empty">
<link rel="previous" href="empty.html" title="empty">
<link rel="next" href="back.html" title="back">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
@ -23,29 +23,33 @@
<a accesskey="p" href="empty.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="back.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.front"></a><a href="front.html" title="front">front</a></h5></div></div></div>
<div class="titlepage">
<div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.front"></a><a href="front.html" title="front">front</a>
</h5></div></div>
<div></div>
</div>
<a name="fusion.sequence.intrinsic.functions.front.description"></a><h6>
<a name="id1009296"></a>
<a name="id452090"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.description">Description</a>
</h6>
<p>
Returns the first element in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.front.synopsis"></a><h6>
<a name="id1009324"></a>
<a name="id452119"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.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">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/front.html" title="front"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></code></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="keyword">typename</span> <a href="../metafunctions/front.html" title="front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">front</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/front.html" title="front"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></code></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="keyword">typename</span> <a href="../metafunctions/front.html" title="front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">front</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.front.parameters"></a><h6>
<a name="id1009567"></a>
<a name="id452393"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
@ -55,77 +59,65 @@
<col>
</colgroup>
<thead><tr>
<th>
<p>
<th><p>
Parameter
</p>
</th>
<th>
<p>
</p></th>
<th><p>
Requirement
</p>
</th>
<th>
<p>
</p></th>
<th><p>
Description
</p>
</th>
</p></th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">seq</span></code>
</p>
</td>
<td>
<p>
<td><p>
<tt class="computeroutput"><span class="identifier">seq</span></tt>
</p></td>
<td><p>
Model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
</p></td>
<td><p>
The sequence we wish to investigate.
</p>
</td>
</p></td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.front.expression_semantics"></a><h6>
<a name="id1009670"></a>
<a name="id452507"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting"><span class="identifier">front</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Return type</strong></span>: Returns a reference to
the first element in the sequence <code class="computeroutput"><span class="identifier">seq</span></code>
if <code class="computeroutput"><span class="identifier">seq</span></code> is mutable and
<code class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></code>, where <code class="computeroutput"><span class="identifier">e</span></code>
<span class="bold"><b>Return type</b></span>: Returns a reference to
the first element in the sequence <tt class="computeroutput"><span class="identifier">seq</span></tt>
if <tt class="computeroutput"><span class="identifier">seq</span></tt> is mutable and
<tt class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></tt>, where <tt class="computeroutput"><span class="identifier">e</span></tt>
is the first element in the sequence, is a valid expression. Else, returns
a type convertable to the first element in the sequence.
</p>
<p>
<span class="bold"><strong>Precondition</strong></span>: <code class="computeroutput"><a href="empty.html" title="empty"><code class="computeroutput"><span class="identifier">empty</span></code></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">false</span></code>
<span class="bold"><b>Precondition</b></span>: <tt class="computeroutput"><a href="empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">false</span></tt>
</p>
<p>
<span class="bold"><strong>Semantics</strong></span>: Returns the first element
<span class="bold"><b>Semantics</b></span>: Returns the first element
in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.front.header"></a><h6>
<a name="id1009844"></a>
<a name="id452699"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">front</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">front</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.front.example"></a><h6>
<a name="id1009993"></a>
<a name="id452866"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.example">Example</a>
</h6>
<pre class="programlisting"><a 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">,</span> <span class="keyword">int</span><span class="special">&gt;</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="number">3</span><span class="special">);</span>
<pre class="programlisting"><a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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="number">3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">front</span><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>
</div>