mirror of
https://github.com/boostorg/mpl.git
synced 2026-01-26 17:02:20 +01:00
56 lines
1.9 KiB
HTML
56 lines
1.9 KiB
HTML
<!doctype html public "-//ietf//dtd html//en">
|
|
<html><head><title>boost::mpl::deref</title>
|
|
<link rel="stylesheet" href="../mpl_wiki.css">
|
|
</head><body bgcolor="white">
|
|
<h1><a href="../Table_of_Contents.html"><img src="../mpl_logo.jpg" alt="[Home]" border=0 align="right"></a>deref</h1><h3>Synopsis</h3>
|
|
<p>
|
|
<pre>
|
|
template<
|
|
typename Iterator
|
|
>
|
|
struct deref
|
|
{
|
|
typedef typename Iterator::type type;
|
|
};
|
|
</pre>
|
|
<p>
|
|
<h3>Description</h3>
|
|
<p>
|
|
Dereferences an iterator.
|
|
<p>
|
|
<h3>Definition</h3>
|
|
<p>
|
|
<pre>
|
|
#include "<a href="../../../../../boost/mpl/deref.hpp">boost/mpl/deref.hpp</a>"
|
|
</pre>
|
|
<p>
|
|
<h3>Parameters</h3>
|
|
<table border="1">
|
|
<tr><th> Parameter </th><th> Requirement </th><th> Description </th></tr>
|
|
<tr><td><code>Iterator</code></td><td>A model of <a href="../Trivial_Iterator.html">Trivial Iterator</a></td><td>An iterator to be dereferenced. </td></tr>
|
|
</table>
|
|
<p>
|
|
<h3>Expression semantics</h3>
|
|
<p>
|
|
<table border="1">
|
|
<tr><th> Expression </th><th> Expression type </th><th> Precondition </th><th> Semantics </th><th> Postcondition </th></tr>
|
|
<tr><td><code>typedef deref<Iterator>::type t;</code></td><td>A type</td><td></td><td>Equivalent to <code>typedef Iterator::type t;</code>.</td><td><code>Iterator</code> is dereferenceable </td></tr>
|
|
</table>
|
|
<p>
|
|
<h3>Complexity</h3>
|
|
<p>
|
|
Amortized constant time.
|
|
<p>
|
|
<h3>Example</h3>
|
|
<p>
|
|
<pre>
|
|
typedef <a href="../Reference/list.html">list</a><char,short,int,long> types;
|
|
typedef <a href="../Reference/begin.html">begin</a><types>::type iter;
|
|
BOOST_STATIC_ASSERT(boost::is_same< deref<iter>::type,char >::value));
|
|
</pre>
|
|
<p>
|
|
<h3>See also</h3>
|
|
<p>
|
|
<a href="../Iterators.html">Iterators</a>, <code><a href="../Reference/begin.html">begin</a>/<a href="../Reference/end.html">end</a></code>
|
|
<p><hr>
|
|
<a href="../Table_of_Contents.html">Table of Contents</a><br>Last edited March 10, 2003 5:30 am</body></html> |