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#ifndef Singleton_h
#define Singleton_h
/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This software 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
#include "Counter.h"
#include "NonCopyable.h"
#include <QObject>
namespace Base{
//* a class singleton used to centralize all objects that need static creation
class Singleton final: private Counter<Singleton>, private NonCopyable<Singleton>
{
public:
//* return singleton
static Singleton& get();
//*@name accessors
//@{
//* true if has application
bool hasApplication() const
{ return (bool) application_; }
//* application
QObject* application()
{
Q_CHECK_PTR( application_ );
return application_;
}
//* cast
template< typename T >
T* application()
{
Q_CHECK_PTR( application_ );
return static_cast<T*>( application_ );
}
//@}
//*@name modifiers
//@{
//* set application
void setApplication( QObject* application )
{
Q_ASSERT( !application_ );
application_ = application;
}
//@}
private:
//* constructor
explicit Singleton():
Counter( "Singleton" )
{}
QObject* application_ = nullptr;
};
}
#endif
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