/* From function Trial1, pObj2 = pObj1; increasing use_count of both p1 and p2. Doing reset on of them is giving use_count of resettled one as 0 and other one as 1. use_count one obtained at the end of code forces me to think that somewhere reference is still hold. From function Trial2, we are setting reference of one object into another object. Check last 2 to 3 lines of code into Trail2 to understand reference count..! currently it prints 2 if shared_ptr getReportee() is changed to shared_ptr& getReportee() then count is 1. */ /* Thanks to Mo Elomary https://www.sololearn.com/Discuss/3236988/?ref=app */ #include #include using namespace std; class clsTest { public: clsTest(int id) : m_intId(id) {} void display() { cout << "Hi from Id : " << m_intId << endl; } void setReportee(shared_ptr pObj) { m_pObj = pObj; } shared_ptr getReportee() {return m_pObj;} private: shared_ptr m_pObj; int m_intId; }; void Trial1() { shared_ptr pObj1 = make_shared(1); pObj1->display(); cout << "Count of 1 " << pObj1.use_count() << endl; shared_ptr pObj2 = pObj1; cout << "Copied 1 into 2 " << endl; cout << "Count of 1 " << pObj1.use_count() << " and pointer1 is " << pObj1.get() << endl; cout << "Count of 2 " << pObj2.use_count() << " and pointer2 is " << pObj2.get() << endl; pObj2.reset(); cout << "Reset on 2 " << endl; cout << "Count of 1 " << pObj1.use_count() << " and pointer1 is " << pObj1.get() << endl; cout << "Count of 2 " << pObj2.use_count() << " and pointer2 is " << pObj2.get() << endl; cout << "--------------------------------------" << endl; } void Trial2() { shared_ptr pObj1 = make_shared(1); pObj1->display(); shared_ptr pObj2 = make_shared(2); pObj2->display(); cout << "Count of 1 " << pObj1.use_count() << " and pointer1 is " << pObj1.get() << endl; cout << "Count of 2 " << pObj2.use_count() << " and pointer2 is " << pObj2.get() << endl; pObj1->setReportee(pObj2); cout << "Set 2 into 1 " << endl; cout << "Count of 1 " << pObj1.use_count() << " and pointer1 is " << pObj1.get() << endl; cout << "Count of 2 " << pObj2.use_count() << " and pointer2 is " << pObj2.get() << endl; pObj2.reset(); cout << "Reset on 2 " << endl; cout << "Count of 1 " << pObj1.use_count() << " and pointer1 is " << pObj1.get() << endl; cout << "Count of 2 " << pObj2.use_count() << " and pointer2 is " << pObj2.get() << endl; pObj1->getReportee()->display(); cout << "Count of 1 " << pObj1.use_count() << " and pointer1 is " << pObj1.get() << endl; cout << "Count of reportee " << pObj1->getReportee().use_count() << " and pointer is " << pObj1->getReportee().get() << endl; cout << endl << endl << endl; } int main() { Trial1(); Trial2(); return 0; }

use_count On Shared_ptr