<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/qpair.doc:40 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>TQPair Class</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQPair Class Reference</h1> <p>The TQPair class is a value-based template class that provides a pair of elements. <a href="#details">More...</a> <p><tt>#include <<a href="qpair-h.html">ntqpair.h</a>></tt> <p><a href="qpair-members.html">List of all member functions.</a> <h2>Public Members</h2> <ul> <li class=fn>typedef T1 <a href="#first_type"><b>first_type</b></a></li> <li class=fn>typedef T2 <a href="#second_type"><b>second_type</b></a></li> <li class=fn><a href="#TQPair"><b>TQPair</b></a> ()</li> <li class=fn><a href="#TQPair-2"><b>TQPair</b></a> ( const T1 & t1, const T2 & t2 )</li> <li class=fn>TQPair<T1, T2> & <b>operator=</b> ( const TQPair<T1, T2> & other )</li> </ul> <h2>Related Functions</h2> <ul> <li class=fn>TQPair <a href="#qMakePair"><b>qMakePair</b></a> ( T1 t1, T2 t2 )</li> </ul> <hr><a name="details"></a><h2>Detailed Description</h2> The TQPair class is a value-based template class that provides a pair of elements. <p> <p> TQPair is a TQt implementation of an STL-like pair. It can be used in your application if the standard pair<> is not available on your target platforms. <p> TQPair<T1, T2> defines a template instance to create a pair of values that contains two values of type T1 and T2. Please note that TQPair does not store pointers to the two elements; it holds a copy of every member. This is why these kinds of classes are called <em>value based</em>. If you're interested in <em>pointer based</em> classes see, for example, <a href="ntqptrlist.html">TQPtrList</a> and <a href="ntqdict.html">TQDict</a>. <p> TQPair holds one copy of type T1 and one copy of type T2, but does not provide iterators to access these elements. Instead, the two elements (<tt>first</tt> and <tt>second</tt>) are public member variables of the pair. TQPair owns the contained elements. For more relaxed ownership semantics, see <a href="ntqptrcollection.html">TQPtrCollection</a> and friends which are pointer-based containers. <p> Some classes cannot be used within a TQPair: for example, all classes derived from <a href="ntqobject.html">TQObject</a> and thus all classes that implement widgets. Only "values" can be used in a TQPair. To qualify as a value the class must provide: <p> <ul> <li> A copy constructor <li> An assignment operator <li> A constructor that takes no arguments </ul> <p> Note that C++ defaults to field-by-field assignment operators and copy constructors if no explicit version is supplied. In many cases this is sufficient. <p> TQPair uses an STL-like syntax to manipulate and address the objects it contains. See the <a href="ntqtl.html">TQTL documentation</a> for more information. <p> Functions that need to return two values can use a TQPair. <p>See also <a href="ntqtl.html">TQt Template Library Classes</a>, <a href="shared.html">Implicitly and Explicitly Shared Classes</a>, and <a href="tools.html">Non-GUI Classes</a>. <hr><h2>Member Type Documentation</h2> <h3 class=fn><a name="first_type"></a>TQPair::first_type</h3> The type of the first element in the pair. <h3 class=fn><a name="second_type"></a>TQPair::second_type</h3> The type of the second element in the pair. <hr><h2>Member Function Documentation</h2> <h3 class=fn><a name="TQPair"></a>TQPair::TQPair () </h3> <p> Constructs an empty pair. The <tt>first</tt> and <tt>second</tt> elements are default constructed. <h3 class=fn><a name="TQPair-2"></a>TQPair::TQPair ( const T1 & t1, const T2 & t2 ) </h3> <p> Constructs a pair and initializes the <tt>first</tt> element with <em>t1</em> and the <tt>second</tt> element with <em>t2</em>. <hr><h2>Related Functions</h2> <h3 class=fn><a href="ntqpair.html">TQPair</a> <a name="qMakePair"></a>qMakePair ( T1 t1, T2 t2 ) </h3> <p> <p> This is a template convenience function. It is used to create a TQPair<> object that contains <em>t1</em> and <em>t2</em>. <!-- eof --> <hr><p> This file is part of the <a href="index.html">TQt toolkit</a>. Copyright © 1995-2007 <a href="http://www.trolltech.com/">Trolltech</a>. 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