You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
147 lines
5.2 KiB
147 lines
5.2 KiB
/****************************************************************************
|
|
**
|
|
** QPair class documentation
|
|
**
|
|
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
|
|
**
|
|
** This file is part of the Qt GUI Toolkit.
|
|
**
|
|
** This file may be used under the terms of the GNU General
|
|
** Public License versions 2.0 or 3.0 as published by the Free
|
|
** Software Foundation and appearing in the files LICENSE.GPL2
|
|
** and LICENSE.GPL3 included in the packaging of this file.
|
|
** Alternatively you may (at your option) use any later version
|
|
** of the GNU General Public License if such license has been
|
|
** publicly approved by Trolltech ASA (or its successors, if any)
|
|
** and the KDE Free Qt Foundation.
|
|
**
|
|
** Please review the following information to ensure GNU General
|
|
** Public Licensing retquirements will be met:
|
|
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
|
|
** If you are unsure which license is appropriate for your use, please
|
|
** review the following information:
|
|
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
|
|
** or contact the sales department at sales@trolltech.com.
|
|
**
|
|
** This file may be used under the terms of the Q Public License as
|
|
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
|
|
** included in the packaging of this file. Licensees holding valid Qt
|
|
** Commercial licenses may use this file in accordance with the Qt
|
|
** Commercial License Agreement provided with the Software.
|
|
**
|
|
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
|
|
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
|
|
** herein.
|
|
**
|
|
**********************************************************************/
|
|
|
|
/*****************************************************************************
|
|
QPair documentation
|
|
*****************************************************************************/
|
|
|
|
|
|
/*!
|
|
\class QPair qpair.h
|
|
\brief The QPair class is a value-based template class that provides a pair of elements.
|
|
|
|
\ingroup qtl
|
|
\ingroup tools
|
|
\ingroup shared
|
|
|
|
QPair is a Qt implementation of an STL-like pair. It can be used
|
|
in your application if the standard pair\<\> is not available on
|
|
your target platforms.
|
|
|
|
QPair\<T1, T2\> defines a template instance to create a pair of
|
|
values that contains two values of type T1 and T2. Please note
|
|
that QPair does not store pointers to the two elements; it holds a
|
|
copy of every member. This is why these kinds of classes are
|
|
called \e{value based}. If you're interested in \e{pointer based}
|
|
classes see, for example, QPtrList and QDict.
|
|
|
|
QPair 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 (\c first and \c second) are public member variables of
|
|
the pair. QPair owns the contained elements. For more relaxed
|
|
ownership semantics, see QPtrCollection and friends which are
|
|
pointer-based containers.
|
|
|
|
Some classes cannot be used within a QPair: for example, all
|
|
classes derived from QObject and thus all classes that implement
|
|
widgets. Only "values" can be used in a QPair. To qualify as a
|
|
value the class must provide:
|
|
|
|
\list
|
|
\i A copy constructor
|
|
\i An assignment operator
|
|
\i A constructor that takes no arguments
|
|
\endlist
|
|
|
|
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.
|
|
|
|
QPair uses an STL-like syntax to manipulate and address the
|
|
objects it contains. See the \link qtl.html QTL
|
|
documentation\endlink for more information.
|
|
|
|
Functions that need to return two values can use a QPair.
|
|
*/
|
|
|
|
/*! \enum QPair::first_type
|
|
The type of the first element in the pair. */
|
|
|
|
/*! \enum QPair::second_type
|
|
The type of the second element in the pair. */
|
|
|
|
|
|
/*!
|
|
\fn QPair::QPair()
|
|
|
|
Constructs an empty pair. The \c first and \c second elements are
|
|
default constructed.
|
|
*/
|
|
|
|
/*!
|
|
\fn QPair::QPair( const T1& t1, const T2& t2 )
|
|
|
|
Constructs a pair and initializes the \c first element with \a t1
|
|
and the \c second element with \a t2.
|
|
*/
|
|
|
|
/*!
|
|
\fn bool operator==( const QPair<T1, T2>& x, const QPair<T1, T2>& y )
|
|
|
|
Returns TRUE if \a x is equal to \a y; otherwise returns FALSE.
|
|
Two QPairs are equal if both their \c first and \c second elements
|
|
are equal.
|
|
*/
|
|
|
|
/*!
|
|
\fn bool operator<( const QPair<T1, T2>& x, const QPair<T1, T2>& y )
|
|
|
|
Returns TRUE if \a x is less than \a y; otherwise returns FALSE.
|
|
\a x is less than \a y if x.first is less than y.first, or if
|
|
x.second is less than y.second and x.first is the same as y.first.
|
|
|
|
For example, (0, 1) < (0, 4) and (0, 4) < (1, 0).
|
|
*/
|
|
|
|
/*! \fn QPair<T1, T2> qMakePair( const T1& x, const T2& y )
|
|
|
|
Convenience wrapper for the QPair constructor.
|
|
*/
|
|
|
|
/*! \fn QDataStream& operator>>( QDataStream& s, QPair<T1, T2>& p )
|
|
|
|
Reads a pair \a p from the stream \a s. The types T1 and T2 must
|
|
implement the streaming operator as well.
|
|
*/
|
|
|
|
/*! \fn QDataStream& operator<<( QDataStream& s, const QPair<T1, T2>& p )
|
|
|
|
Writes the pair \a p to the stream \a s. The types T1 and T2 must
|
|
implement the streaming operator as well.
|
|
*/
|