qatomic.h File Reference

#include <QtCore/qglobal.h>
#include <QtCore/qbasicatomic.h>

Go to the source code of this file.

Classes
class	QAtomicInt
	The QAtomicInt class provides platform-independent atomic operations on integers. More...
class	QAtomicPointer< T >
	The QAtomicPointer class is a template class that provides platform-independent atomic operations on pointers. More...

Functions
template<typename T >
void	qAtomicAssign (T *&d, T *x)
	This is a helper for the assignment operators of implicitly shared classes. More...
template<typename T >
void	qAtomicDetach (T *&d)
	This is a helper for the detach method of implicitly shared classes. More...

Function Documentation

qAtomicAssign()

template<typename T >

void qAtomicAssign ( T *&  d, T *  x  )

inline

This is a helper for the assignment operators of implicitly shared classes.

Your assignment operator should look like this:

Definition at line 195 of file qatomic.h.

Referenced by QColormap::hPal(), QSqlRecord::operator=(), QSqlField::operator=(), QSqlQuery::operator=(), QColormap::operator=(), QDBusMessage::operator=(), QPen::operator=(), QDBusArgument::operator=(), QSqlDatabase::operator=(), QUrl::operator=(), QKeySequence::operator=(), and qt_conv16ToRgb().

{
    if (d == x)
        return;
    x->ref.ref();
    if (!d->ref.deref())
        delete d;
    d = x;
}

qAtomicDetach()

template<typename T >

void qAtomicDetach ( T *&  d )

inline

This is a helper for the detach method of implicitly shared classes.

Your private class needs a copy constructor which copies the members and sets the refcount to 1. After that, your detach function should look like this:

Definition at line 214 of file qatomic.h.

Referenced by QSqlField::detach(), QSqlRecord::detach(), QScopedSharedPointer< QScriptDebuggerConsoleCommandGroupDataPrivate >::detach(), operator>>(), QUrl::resolved(), and QKeySequence::setKey().

{
    if (d->ref == 1)
        return;
    T *x = d;
    d = new T(*d);
    if (!x->ref.deref())
        delete x;
}