mirror of
https://github.com/pocoproject/poco.git
synced 2024-12-13 10:32:57 +01:00
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
//
|
|
// SingletonHolder.h
|
|
//
|
|
// $Id: //poco/1.4/Foundation/include/Poco/SingletonHolder.h#1 $
|
|
//
|
|
// Library: Foundation
|
|
// Package: Core
|
|
// Module: SingletonHolder
|
|
//
|
|
// Definition of the SingletonHolder template.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person or organization
|
|
// obtaining a copy of the software and accompanying documentation covered by
|
|
// this license (the "Software") to use, reproduce, display, distribute,
|
|
// execute, and transmit the Software, and to prepare derivative works of the
|
|
// Software, and to permit third-parties to whom the Software is furnished to
|
|
// do so, all subject to the following:
|
|
//
|
|
// The copyright notices in the Software and this entire statement, including
|
|
// the above license grant, this restriction and the following disclaimer,
|
|
// must be included in all copies of the Software, in whole or in part, and
|
|
// all derivative works of the Software, unless such copies or derivative
|
|
// works are solely in the form of machine-executable object code generated by
|
|
// a source language processor.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
|
|
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
|
|
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
|
|
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
// DEALINGS IN THE SOFTWARE.
|
|
//
|
|
|
|
|
|
#ifndef Foundation_SingletonHolder_INCLUDED
|
|
#define Foundation_SingletonHolder_INCLUDED
|
|
|
|
|
|
#include "Poco/Foundation.h"
|
|
#include "Poco/Mutex.h"
|
|
|
|
|
|
namespace Poco {
|
|
|
|
|
|
template <class S>
|
|
class SingletonHolder
|
|
/// This is a helper template class for managing
|
|
/// singleton objects allocated on the heap.
|
|
/// The class ensures proper deletion (including
|
|
/// calling of the destructor) of singleton objects
|
|
/// when the application that created them terminates.
|
|
{
|
|
public:
|
|
SingletonHolder():
|
|
_pS(0)
|
|
/// Creates the SingletonHolder.
|
|
{
|
|
}
|
|
|
|
~SingletonHolder()
|
|
/// Destroys the SingletonHolder and the singleton
|
|
/// object that it holds.
|
|
{
|
|
delete _pS;
|
|
}
|
|
|
|
S* get()
|
|
/// Returns a pointer to the singleton object
|
|
/// hold by the SingletonHolder. The first call
|
|
/// to get will create the singleton.
|
|
{
|
|
FastMutex::ScopedLock lock(_m);
|
|
if (!_pS) _pS = new S;
|
|
return _pS;
|
|
}
|
|
|
|
private:
|
|
S* _pS;
|
|
FastMutex _m;
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_SingletonHolder_INCLUDED
|