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This is the verbatim text of the qpair.h include file. It is provided only for illustration; the copyright remains with Trolltech.

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/****************************************************************************
**
** Definition of QPair class
**
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#ifndef QPAIR_H
#define QPAIR_H

#ifndef QT_H
#include "qglobal.h"
#endif // QT_H

template <class T1, class T2>
struct QPair
{
    typedef T1 first_type;
    typedef T2 second_type;

    QPair()
	: first( T1() ), second( T2() )
    {}
    QPair( const T1& t1, const T2& t2 )
	: first( t1 ), second( t2 )
    {}

    T1 first;
    T2 second;
};

template <class T1, class T2>
Q_INLINE_TEMPLATES bool operator==( const QPair<T1, T2>& x, const QPair<T1, T2>& y )
{
    return x.first == y.first && x.second == y.second;
}

template <class T1, class T2>
Q_INLINE_TEMPLATES bool operator<( const QPair<T1, T2>& x, const QPair<T1, T2>& y )
{
    // x < y is TRUE if:
    // x.first is less than y.first,
    // or if x.second is less that y.second and x.first is the same as y.first
    return x.first < y.first ||	( !( y.first < x.first ) && x.second < y.second );
}

template <class T1, class T2>
Q_INLINE_TEMPLATES QPair<T1, T2> qMakePair( const T1& x, const T2& y )
{
    return QPair<T1, T2>( x, y );
}

#endif