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.
140 lines
4.6 KiB
140 lines
4.6 KiB
/*
|
|
* This file is part of the KDE Libraries
|
|
* Copyright (C) 2000 Stephan Kulow <coolo@kde.org>
|
|
* 2001 KDE Team
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public License
|
|
* along with this library; see the file COPYING.LIB. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
#ifndef _KSTATIC_DELETER_H_
|
|
#define _KSTATIC_DELETER_H_
|
|
|
|
#include <tdeglobal.h>
|
|
|
|
/**
|
|
* Static deleters are used to manage static resources. They can register
|
|
* themselves with TDEGlobal. TDEGlobal will call destructObject() when
|
|
* TDEGlobal::deleteStaticDeleters() is called or when it the process
|
|
* finishes.
|
|
*
|
|
* @see KStaticDeleter
|
|
* @see TDEGlobal::registerStaticDeleter()
|
|
* @see TDEGlobal::unregisterStaticDeleter()
|
|
* @see TDEGlobal::deleteStaticDeleters()
|
|
*/
|
|
class TDECORE_EXPORT KStaticDeleterBase {
|
|
public:
|
|
virtual ~KStaticDeleterBase() { }
|
|
/**
|
|
* Should destruct the resources managed by this KStaticDeleterBase.
|
|
* Usually you also want to call it in your destructor.
|
|
* @see TDEGlobal::deleteStaticDeleters()
|
|
*/
|
|
virtual void destructObject();
|
|
};
|
|
|
|
/**
|
|
* Little helper class to clean up static objects that are
|
|
* held as pointer.
|
|
* When the library is unloaded, or the app terminated, all static deleters
|
|
* are destroyed, which in turn destroys those static objects properly.
|
|
* There are some rules which you should accept in the KStaticDeleter managed
|
|
* class:
|
|
* @li Don't rely on the global reference variable in the destructor of the
|
|
* object, it will be '0' at destruction time.
|
|
* @li Don't rely on other KStaticDeleter managed objects in the destructor
|
|
* of the object, because it may be destroyed before your destructor get called.
|
|
* This one can be tricky, because you might not know that you actually use a
|
|
* KStaticDeleter managed class. So try to keep your destructor simple.
|
|
*
|
|
* A typical use is
|
|
* \code
|
|
* static KStaticDeleter<MyClass> sd;
|
|
*
|
|
* MyClass &MyClass::self() {
|
|
* if (!_self) { sd.setObject(_self, new MyClass()); }
|
|
* return *_self;
|
|
* }
|
|
* \endcode
|
|
*/
|
|
template<class type> class KStaticDeleter : public KStaticDeleterBase {
|
|
public:
|
|
KStaticDeleter() { deleteit = 0; globalReference = 0; array = false; }
|
|
/**
|
|
* Sets the object to delete and registers the object to be
|
|
* deleted to TDEGlobal. If the given object is 0, the former
|
|
* registration is unregistered.
|
|
* @param obj the object to delete
|
|
* @param isArray tells the destructor to delete an array instead of an object
|
|
* @deprecated See the other setObject variant.
|
|
**/
|
|
TDE_DEPRECATED type *setObject( type *obj, bool isArray = false) {
|
|
deleteit = obj;
|
|
globalReference = 0;
|
|
array = isArray;
|
|
if (obj)
|
|
TDEGlobal::registerStaticDeleter(this);
|
|
else
|
|
TDEGlobal::unregisterStaticDeleter(this);
|
|
return obj;
|
|
}
|
|
/**
|
|
* Sets the object to delete and registers the object to be
|
|
* deleted to TDEGlobal. If the given object is 0, the former
|
|
* registration is unregistered.
|
|
* @param globalRef the static pointer where this object is stored
|
|
* This pointer will be reset to 0 after deletion of the object.
|
|
* @param obj the object to delete
|
|
* @param isArray tells the destructor to delete an array instead of an object
|
|
**/
|
|
type *setObject( type* & globalRef, type *obj, bool isArray = false) {
|
|
globalReference = &globalRef;
|
|
deleteit = obj;
|
|
array = isArray;
|
|
if (obj)
|
|
TDEGlobal::registerStaticDeleter(this);
|
|
else
|
|
TDEGlobal::unregisterStaticDeleter(this);
|
|
globalRef = obj;
|
|
return obj;
|
|
}
|
|
|
|
/**
|
|
* Destructs the object. This has the same effect as deleting
|
|
* the KStaticDeleter.
|
|
*/
|
|
virtual void destructObject() {
|
|
if (globalReference)
|
|
*globalReference = 0;
|
|
if (array)
|
|
delete [] deleteit;
|
|
else
|
|
delete deleteit;
|
|
deleteit = 0;
|
|
}
|
|
virtual ~KStaticDeleter() {
|
|
TDEGlobal::unregisterStaticDeleter(this);
|
|
destructObject();
|
|
}
|
|
private:
|
|
type *deleteit;
|
|
type **globalReference;
|
|
bool array;
|
|
};
|
|
|
|
#endif
|