mirror of
https://github.com/DaedalusX64/daedalus.git
synced 2025-04-02 10:21:48 -04:00
90 lines
2 KiB
C++
90 lines
2 KiB
C++
/*
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Copyright (C) 2001 StrmnNrmn
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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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#pragma once
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#ifndef UTILITY_SINGLETON_H_
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#define UTILITY_SINGLETON_H_
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#include <stdlib.h>
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#include <memory>
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#include "Base/Assert.h"
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//
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// CSingleton is an abstract base class for classes where only one
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// instance exists throughout the execution of the program
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// Typical usuage is:
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//
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// CMyUniqueClass::Create();
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// ..
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// CMyUniqueClass::Get()->DoSomething();
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// etc
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// ..
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// CMyUniqueClass::Destroy();
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//
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//
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template < class T > class CSingleton
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{
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public:
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//CSingleton();
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virtual ~CSingleton() {}
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inline static std::shared_ptr<T> Get()
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{
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#ifdef DAEDALUS_ENABLE_ASSERTS
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DAEDALUS_ASSERT(mpInstance != nullptr, "%s", __PRETTY_FUNCTION__ );
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#endif
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return mpInstance;
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}
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static bool Create();
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static void Destroy()
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{
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#ifdef DAEDALUS_ENABLE_ASSERTS
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DAEDALUS_ASSERT_Q(mpInstance != nullptr);
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#endif
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mpInstance = nullptr;
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}
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inline static bool IsAvailable()
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{
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return (mpInstance != nullptr);
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}
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static void Attach( std::unique_ptr<T> p )
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{
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#ifdef DAEDALUS_ENABLE_ASSERTS
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DAEDALUS_ASSERT_Q(mpInstance == nullptr);
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#endif
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mpInstance = p;
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}
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protected:
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static std::shared_ptr<T> mpInstance;
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};
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template < class T > std::shared_ptr<T> CSingleton< T >::mpInstance = NULL;
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#endif // UTILITY_SINGLETON_H_
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