singleton.h
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/*
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* CC/LICENSE
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __IMS_SINGLETON_H_
#define __IMS_SINGLETON_H_
#include <pthread.h>
#include <stdlib.h>
namespace ims {
template<class T>
class singleton_t {
public:
static T* instance() {
pthread_once(&_once, &singleton_t::initialize);
return _instance;
}
private:
static void initialize() {
_instance = new T();
::atexit(destroy);
}
static void destroy() {
delete _instance;
}
private:
singleton_t(const singleton_t&);
const singleton_t& operator=(const singleton_t&);
static pthread_once_t _once;
static T* _instance;
};
template<class T>
pthread_once_t singleton_t<T>::_once = PTHREAD_ONCE_INIT;
template<class T>
T* singleton_t<T>::_instance = NULL;
}
#endif //__SINGLETON_H_
/* vim: set ts=4 sw=4 sts=4 tw=100 noet: */