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+++ b/src/corelib/tools/qpair.qdoc Mon Jan 11 14:00:40 2010 +0000
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
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+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
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+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
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+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
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+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
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+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \class QPair
+ \brief The QPair class is a template class that stores a pair of items.
+
+ \ingroup tools
+
+ QPair\<T1, T2\> can be used in your application if the STL \c
+ pair type is not available. It stores one value of type T1 and
+ one value of type T2. It can be used as a return value for a
+ function that needs to return two values, or as the value type of
+ a \l{generic container}.
+
+ Here's an example of a QPair that stores one QString and one \c
+ double value:
+
+ \snippet doc/src/snippets/code/doc_src_qpair.qdoc 0
+
+ The components are accessible as public data members called \l
+ first and \l second. For example:
+
+ \snippet doc/src/snippets/code/doc_src_qpair.qdoc 1
+
+ QPair's template data types (T1 and T2) must be \l{assignable
+ data types}. You cannot, for example, store a QWidget as a value;
+ instead, store a QWidget *. A few functions have additional
+ requirements; these requirements are documented on a per-function
+ basis.
+
+ \sa {Generic Containers}
+*/
+
+/*! \typedef QPair::first_type
+
+ The type of the first element in the pair (T1).
+
+ \sa first
+*/
+
+/*! \typedef QPair::second_type
+
+ The type of the second element in the pair (T2).
+
+ \sa second
+*/
+
+/*! \variable QPair::first
+
+ The first element in the pair.
+*/
+
+/*! \variable QPair::second
+
+ The second element in the pair.
+*/
+
+/*! \fn QPair::QPair()
+
+ Constructs an empty pair. The \c first and \c second elements are
+ initialized with \l{default-constructed values}.
+*/
+
+/*!
+ \fn QPair::QPair(const T1 &value1, const T2 &value2)
+
+ Constructs a pair and initializes the \c first element with \a
+ value1 and the \c second element with \a value2.
+
+ \sa qMakePair()
+*/
+
+/*!
+ \fn QPair<T1, T2> &QPair::operator=(const QPair<T1, T2> &other)
+
+ Assigns \a other to this pair.
+*/
+
+/*! \fn bool operator==(const QPair<T1, T2> &p1, const QPair<T1, T2> &p2)
+
+ \relates QPair
+
+ Returns true if \a p1 is equal to \a p2; otherwise returns false.
+ Two pairs compare equal if their \c first data members compare
+ equal and if their \c second data members compare equal.
+
+ This function requires the T1 and T2 types to have an
+ implementation of \c operator==().
+*/
+
+/*! \fn bool operator!=(const QPair<T1, T2> &p1, const QPair<T1, T2> &p2)
+
+ \relates QPair
+
+ Returns true if \a p1 is not equal to \a p2; otherwise returns
+ false. Two pairs compare as not equal if their \c first data
+ members are not equal or if their \c second data members are not
+ equal.
+
+ This function requires the T1 and T2 types to have an
+ implementation of \c operator==().
+*/
+
+/*! \fn bool operator<(const QPair<T1, T2> &p1, const QPair<T1, T2> &p2)
+
+ \relates QPair
+
+ Returns true if \a p1 is less than \a p2; otherwise returns
+ false. The comparison is done on the \c first members of \a p1
+ and \a p2; if they compare equal, the \c second members are
+ compared to break the tie.
+
+ This function requires the T1 and T2 types to have an
+ implementation of \c operator<().
+*/
+
+/*! \fn bool operator>(const QPair<T1, T2> &p1, const QPair<T1, T2> &p2)
+
+ \relates QPair
+
+ Returns true if \a p1 is greater than \a p2; otherwise returns
+ false. The comparison is done on the \c first members of \a p1
+ and \a p2; if they compare equal, the \c second members are
+ compared to break the tie.
+
+ This function requires the T1 and T2 types to have an
+ implementation of \c operator<().
+*/
+
+/*! \fn bool operator<=(const QPair<T1, T2> &p1, const QPair<T1, T2> &p2)
+
+ \relates QPair
+
+ Returns true if \a p1 is less than or equal to \a p2; otherwise
+ returns false. The comparison is done on the \c first members of
+ \a p1 and \a p2; if they compare equal, the \c second members are
+ compared to break the tie.
+
+ This function requires the T1 and T2 types to have an
+ implementation of \c operator<().
+*/
+
+/*! \fn bool operator>=(const QPair<T1, T2> &p1, const QPair<T1, T2> &p2)
+
+ \relates QPair
+
+ Returns true if \a p1 is greater than or equal to \a p2;
+ otherwise returns false. The comparison is done on the \c first
+ members of \a p1 and \a p2; if they compare equal, the \c second
+ members are compared to break the tie.
+
+ This function requires the T1 and T2 types to have an
+ implementation of \c operator<().
+*/
+
+/*!
+ \fn QPair<T1, T2> qMakePair(const T1 &value1, const T2 &value2)
+
+ \relates QPair
+
+ Returns a QPair\<T1, T2\> that contains \a value1 and \a value2.
+ Example:
+
+ \snippet doc/src/snippets/code/doc_src_qpair.qdoc 2
+
+ This is equivalent to QPair<T1, T2>(\a value1, \a value2), but
+ usually requires less typing.
+*/
+
+/*! \fn QDataStream &operator>>(QDataStream &in, QPair<T1, T2> &pair)
+
+ \relates QPair
+
+ Reads a pair from stream \a in into \a pair.
+
+ This function requires the T1 and T2 types to implement \c operator>>().
+
+ \sa {Format of the QDataStream operators}
+*/
+
+/*! \fn QDataStream &operator<<(QDataStream &out, const QPair<T1, T2> &pair)
+
+ \relates QPair
+
+ Writes the pair \a pair to stream \a out.
+
+ This function requires the T1 and T2 types to implement \c operator<<().
+
+ \sa {Format of the QDataStream operators}
+*/