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57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
/*
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singleton.h
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Copyright (C) 2007 Acekard, www.acekard.com
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Copyright (C) 2007-2009 somebody
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Copyright (C) 2009 yellow wood goblin
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(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, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <cstdlib>
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template <class T>
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class t_singleton {
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public:
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static T& instance() {
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if (NULL == _instance) {
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create_instance();
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// atexit( release_instance );
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// t_singleton 他自己是不会有实例的，无法利用析构函数来释放内存
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// 所以利用 atexit 来在整个程序退出时释放内存
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}
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return *_instance;
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}
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private:
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static void create_instance() {
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if (NULL == _instance) {
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_instance = new T();
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}
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}
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static void release_instance() {
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if (NULL != _instance) {
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delete _instance;
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_instance = NULL;
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}
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}
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private:
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static T* _instance;
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};
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template <class T>
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T* t_singleton<T>::_instance = NULL;
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