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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @author Peter Boros
* @date 2004/09/05
* @version $Id$
* @file singleton.cpp
* @brief Singleton pattern.
*/
#include <stdlib.h>
#include "singleton.h"
namespace fsa {
// {{{ SingletonExitHandler::_instance
SingletonExitHandler* SingletonExitHandler::_instance = NULL;
// }}}
// {{{ SingletonExitHandler::SingletonExitHandler()
SingletonExitHandler::SingletonExitHandler()
: _functionList()
{
/*
* This won't work as part of plugins. When library is unloaded, the
* registration remains, and the program will crash when trying to
* exit.
*/
atexit(&atExit);
}
// }}}
// {{{ SingletonExitHandler::~SingletonExitHandler()
SingletonExitHandler::~SingletonExitHandler()
{
}
// }}}
// {{{ SingletonExitHandler::instance()
SingletonExitHandler* SingletonExitHandler::instance()
{
if (_instance == NULL) {
_instance = new SingletonExitHandler();
}
return _instance;
}
// }}}
// {{{ SingletonExitHandler::registerSingletonDestroyer()
void SingletonExitHandler::registerSingletonDestroyer(void (*p)())
{
_functionList.push_front(p);
}
// }}}
// {{{ SingletonExitHandler::atExit()
void SingletonExitHandler::atExit()
{
SingletonExitHandler::instance()->destroy();
delete SingletonExitHandler::instance();
}
// }}}
// {{{ SingletonExitHandler::destroy()
void SingletonExitHandler::destroy()
{
for(FunctionListIterator iterator=_functionList.begin();
iterator!=_functionList.end(); ++iterator) {
(*iterator)();
}
}
// }}}
} // namespace fsa
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