MeyersCounting

#ifndef MEYERSCOUNTING_H_#define MEYERSCOUNTING_H_template<typename CountedType>class ObjectCounter {private:static size_t count;protected:ObjectCounter() {++ObjectCounter<CountedType>::count;}ObjectCounter( const ObjectCounter<CountedType> &) {++ObjectCounter<CountedType>::count;}~ObjectCounter() {--ObjectCounter<CountedType>::count;}public:static size_t liveCount() {return ObjectCounter<CountedType>::count;}};template<typename CountedType>size_t ObjectCounter<CountedType>::count = 0;class MyClass : public ObjectCounter<MyClass> {};#endif

如果你想给自己的MyClass类计数，记录创建了多少个MyClass实例，那仅仅只需要继承就可以了。