单例类模板编写

template <typename T> class Singleton
{
protected:
static T* ms_singleton;

public:
Singleton()
{
assert(!ms_singleton);
ms_singleton = static_cast<T*>(this);
}
~Singleton()
{
assert(ms_singleton);
ms_singleton = NULL;
}

inline static T& getSingleton()
{
assert(ms_singleton);
return (*ms_singleton);
}

inline static T* getSingletonPtr()
{
return ms_singleton;
}
};