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#ifndef __JE_SINGLETON_H__
#define __JE_SINGLETON_H__
#include "object.h"
#include "exception.h"
namespace JinEngine
{
///
/// Singleton base class.
///
template<class T>
class Singleton : public Object
{
public:
///
/// Get singleton.
///
/// @param Singleton instance of class.
///
static T* get()
{
if (_instance == nullptr)
_instance = new T;
return _instance;
}
///
/// Destroy instance of singleton.
///
static void destroy()
{
delete _instance;
_instance = nullptr;
}
protected:
///
/// Singleton constructor.
///
Singleton()
{
// Check singleton.
if (_instance)
throw Exception("This is a singleton.");
};
///
/// Singleton destructor.
///
virtual ~Singleton() {};
///
/// Singleton instance.
///
static T* _instance;
private:
///
/// Singleton copy constructor.
///
/// @param singleton Singleton of class.
///
Singleton(const Singleton& singleton);
///
/// Singleton assignment.
///
/// @param singleton Singleton of class.
///
Singleton& operator = (const Singleton& singleton);
};
///
/// Singleton instance.
///
template<class T>
T* Singleton<T>::_instance = nullptr;
} // namespace JinEngine
#endif // __JE_SINGLETON_H__
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