C++ 唯一实例类

// Singleton.h: 唯一实例
// 通过调用 Instance 来初始化得到唯一实例
/////////////////////////////////////////////////////////////////////////////

#ifndef _SINGLETON_H
#define _SINGLETON_H


namespace util
{
template <class T>
class Singleton
{
public:
    ~Singleton(){}
    
    static T* Instance()
    {
        if(ms_pInstance == 0)
        {
            ms_pInstance = new T;
        }
        return ms_pInstance;
    }
    
    static void DestroyInstance()
    {
        if(ms_pInstance)
        {
            delete ms_pInstance;
            ms_pInstance = NULL;
        }
    }
    
private:
    static T* ms_pInstance;
};

template <class T>
T* Singleton<T>::ms_pInstance = 0;    
}

#endif