sdrangel/sdrbase/util/threadsafesingleton.h

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2015-08-08 20:09:48 +00:00
/*
* threadsafesingleton.h
*
* Created on: Aug 7, 2015
* Author: f4exb
*/
#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_ */