c++ - counting of references of an object -

c++ - counting of references of an object -

i'm feeling confusion there way count reference of object of class?

class { public : a(){} } int main() { obj; * ptr1 = &obj; * ptr2 = &obj; * ptr3 = &obj; }

now how i'll able know object obj referenced 3 pointers.

raw pointers not reference-counting. need either implement reference-counting smart pointer class yourself, or utilize existing one, such std::shared_ptr.

shared_ptr allows access reference count use_count() fellow member function.

for example:

#include <memory> #include <iostream> class { public : a(){} } int main() { //dynamically allocate rather stack-allocate it, shared_ptr //try delete object when ref count 0. std::shared_ptr<a> ptr1(new a()); std::shared_ptr<a> ptr2(ptr1); std::shared_ptr<a> ptr3(ptr1); std::cout<<"count: "<<ptr1.use_count()<<std::endl; //count: 3 homecoming 0; }

c++