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127 lines
5.5 KiB
127 lines
5.5 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/qpair.doc:40 -->
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<title>QPair Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QPair Class Reference</h1>
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<p>The QPair class is a value-based template class that provides a pair of elements.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qpair-h.html">qpair.h</a>></tt>
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<p><a href="qpair-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>typedef T1 <a href="#first_type"><b>first_type</b></a></li>
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<li class=fn>typedef T2 <a href="#second_type"><b>second_type</b></a></li>
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<li class=fn><a href="#QPair"><b>QPair</b></a> ()</li>
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<li class=fn><a href="#QPair-2"><b>QPair</b></a> ( const T1 & t1, const T2 & t2 )</li>
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<li class=fn>QPair<T1, T2> & <b>operator=</b> ( const QPair<T1, T2> & other )</li>
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</ul>
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<h2>Related Functions</h2>
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<ul>
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<li class=fn>QPair <a href="#qMakePair"><b>qMakePair</b></a> ( T1 t1, T2 t2 )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPair class is a value-based template class that provides a pair of elements.
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<p>
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<p> QPair is a Qt implementation of an STL-like pair. It can be used
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in your application if the standard pair<> is not available on
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your target platforms.
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<p> QPair<T1, T2> defines a template instance to create a pair of
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values that contains two values of type T1 and T2. Please note
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that QPair does not store pointers to the two elements; it holds a
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copy of every member. This is why these kinds of classes are
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called <em>value based</em>. If you're interested in <em>pointer based</em>
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classes see, for example, <a href="qptrlist.html">QPtrList</a> and <a href="qdict.html">QDict</a>.
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<p> QPair holds one copy of type T1 and one copy of type T2, but does
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not provide iterators to access these elements. Instead, the two
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elements (<tt>first</tt> and <tt>second</tt>) are public member variables of
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the pair. QPair owns the contained elements. For more relaxed
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ownership semantics, see <a href="qptrcollection.html">QPtrCollection</a> and friends which are
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pointer-based containers.
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<p> Some classes cannot be used within a QPair: for example, all
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classes derived from <a href="qobject.html">QObject</a> and thus all classes that implement
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widgets. Only "values" can be used in a QPair. To qualify as a
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value the class must provide:
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<p> <ul>
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<li> A copy constructor
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<li> An assignment operator
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<li> A constructor that takes no arguments
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</ul>
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<p> Note that C++ defaults to field-by-field assignment operators and
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copy constructors if no explicit version is supplied. In many
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cases this is sufficient.
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<p> QPair uses an STL-like syntax to manipulate and address the
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objects it contains. See the <a href="qtl.html">QTL
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documentation</a> for more information.
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<p> Functions that need to return two values can use a QPair.
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<p>See also <a href="qtl.html">Qt Template Library Classes</a>, <a href="shared.html">Implicitly and Explicitly Shared Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="first_type"></a>QPair::first_type</h3>
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The type of the first element in the pair.
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<h3 class=fn><a name="second_type"></a>QPair::second_type</h3>
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The type of the second element in the pair.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QPair"></a>QPair::QPair ()
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</h3>
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<p> Constructs an empty pair. The <tt>first</tt> and <tt>second</tt> elements are
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default constructed.
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<h3 class=fn><a name="QPair-2"></a>QPair::QPair ( const T1 & t1, const T2 & t2 )
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</h3>
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<p> Constructs a pair and initializes the <tt>first</tt> element with <em>t1</em>
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and the <tt>second</tt> element with <em>t2</em>.
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<hr><h2>Related Functions</h2>
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<h3 class=fn><a href="qpair.html">QPair</a> <a name="qMakePair"></a>qMakePair ( T1 t1, T2 t2 )
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</h3>
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<p>
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<p> This is a template convenience function. It is used to create a
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QPair<> object that contains <em>t1</em> and <em>t2</em>.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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