-template <typename T>
-class SharedPtr
-{
-public:
- SharedPtr(T *t=NULL)
- {
- refcount = new int;
- *refcount = 1;
- ptr = t;
- }
- SharedPtr(SharedPtr<T> &t)
- {
- //*this = t;
- drop();
- refcount = t.refcount;
- (*refcount)++;
- ptr = t.ptr;
- }
- ~SharedPtr()
- {
- drop();
- }
- SharedPtr<T> & operator=(T *t)
- {
- drop();
- refcount = new int;
- *refcount = 1;
- ptr = t;
- return *this;
- }
- SharedPtr<T> & operator=(SharedPtr<T> &t)
- {
- drop();
- refcount = t.refcount;
- (*refcount)++;
- ptr = t.ptr;
- return *this;
- }
- T* operator->()
- {
- return ptr;
- }
- T & operator*()
- {
- return *ptr;
- }
- bool operator!=(T *t)
- {
- return ptr != t;
- }
- bool operator==(T *t)
- {
- return ptr == t;
- }
- T & operator[](unsigned int i)
- {
- return ptr[i];
- }
-private:
- void drop()
- {
- assert((*refcount) > 0);
- (*refcount)--;
- if(*refcount == 0)
- {
- delete refcount;
- if(ptr != NULL)
- delete ptr;
- }
- }
- T *ptr;
- int *refcount;
-};
-