1c69696a9a
Test built for Symbian and run on P910i without any major problems. Test built for MSVC6. Changed parts seems to compile ok but there are some problems with MSVC6 and some of the targets which the EPOC build does n't support (KYRA,SAGA). svn-id: r18430
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001 Ludvig Strigeus
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* Copyright (C) 2001-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#ifndef COMMON_SINGLETON_H
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#define COMMON_SINGLETON_H
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namespace Common {
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/**
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* Generic template base class for implementing the singleton design pattern.
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*/
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template <class T>
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class Singleton
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{
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private:
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Singleton<T>(const Singleton<T>&);
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Singleton<T>& operator= (const Singleton<T>&);
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static T* _singleton;
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/**
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* The default object factory used by the template class Singleton.
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* By specialising this template function, one can make a singleton use a
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* custom object factory. For example, to support encapsulation, your
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* singleton class might be pure virtual (or "abstract" in Java terminology),
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* and you specialise makeInstance to return an instance of a subclass.
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*/
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//template <class T>
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#if defined (_WIN32_WCE) || defined (_MSC_VER) || defined (__WINS__)
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//FIXME evc4 and msvc7 doesn't like it as private member
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public:
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#endif
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static T* makeInstance() {
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return new T();
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}
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public:
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static T& instance() {
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// TODO: We aren't thread safe. For now we ignore it since the
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// only thing using this singleton template is the config manager,
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// and that is first instantiated long before any threads.
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// TODO: We don't leak, but the destruction order is nevertheless
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// semi-random. If we use multiple singletons, the destruction
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// order might become an issue. There are various approaches
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// to solve that problem, but for now this is sufficient
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if (!_singleton)
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_singleton = T::makeInstance();
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return *_singleton;
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}
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protected:
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Singleton<T>() { }
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#ifdef __SYMBIAN32__
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virtual ~Singleton() { }
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#else
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virtual ~Singleton<T>() { }
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#endif
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typedef T SingletonBaseType;
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};
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#define DECLARE_SINGLETON(T) template<> T* Common::Singleton<T>::_singleton=0
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} // End of namespace Common
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#endif
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