sdrangel/sdrbase/util/threadsafesingleton.h

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///////////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2015-2016 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////////
#ifndef INCLUDE_UTIL_THREADSAFESINGLETON_H_
#define INCLUDE_UTIL_THREADSAFESINGLETON_H_
//! Template class used to make from a class a singleton.
/** S is the type of the singleton object to instantiate.
<br> This class permits to gather all singleton code in the same place
and not to pollute object interface with singleton methods.
<br> Accessing to the instance of S is made through ThreadSafeSingleton<S>::instance()
<br><B>Note :</B> The class using this adapter should have constructor and
destructor protected and copy constructor and operator= private.
<br>Besides it should declare the class ThreadSafeSingleton<S> friend in order
this class can make the construction.
*/
template <class S> class ThreadSafeSingleton
{
public:
static S& instance() { return *_pInstance; }
protected:
ThreadSafeSingleton() {}
~ThreadSafeSingleton() { delete _pInstance; }
static S* _pInstance;
private:
ThreadSafeSingleton(const ThreadSafeSingleton&) {}
ThreadSafeSingleton& operator = (const ThreadSafeSingleton&) {return *this;}
};
template <class S> S *ThreadSafeSingleton<S>::_pInstance = new S;
#endif /* INCLUDE_UTIL_THREADSAFESINGLETON_H_ */