45 lines
805 B
C++
45 lines
805 B
C++
/*
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* Singleton.h
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*
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* Created on: 04.07.2012
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* Author: Felix
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*/
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#ifndef DG_SINGLETON_H_
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#define DG_SINGLETON_H_
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#include <SFML/System.hpp>
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/**
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* Template class for inheriting singleton behaviour.
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*
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* This uses lazy initialization and should be thread safe in C++11 (untested).
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* To use, just make a subclass with only a private default constructor and Singleton<T>
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* as friend class.
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*
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* @code
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* class MyClass : public Singleton<MyClass> {
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* private:
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* friend class Singleton<MyClass>;
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* MyClass() = default;
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* };
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* @endcode
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*/
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template <class T>
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class Singleton : public sf::NonCopyable {
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// Public functions.
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public:
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static T& i();
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};
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/**
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* Returns the instance of T.
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*/
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template <class T>
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T& Singleton<T>::i() {
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static T s;
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return s;
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};
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#endif /* DG_SINGLETON_H_ */
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