#include #include using namespace std; class A{ public: int id; A(){ static int count = 1; id = count++; cout << "Construct A #" << id << endl; } ~A(){ cout << "Destruct A #" << id << endl; } }; class B{ public: int id; B(){ static int count = 1; id = count++; cout << "Construct new B #" << id << endl; } ~B(){ cout << "Destruct new B #" << id << endl; } }; class C{ public: int id; A* a; C(){ static int count = 1; id = count++; cout << "Construct C #" << id << endl; cout << " -> create new A" << endl; a = new A(); } ~C(){ cout << "Destruct C #" << id << endl; cout << "-> delete member A #" << a->id << endl; delete a; } }; class D{ public: int id; D(){ static int count = 1; id = count++; cout << "Construct D #" << id << endl; } ~D(){ cout << "Destruct D #" << id << endl; } }; int main() { A a; B* b = new B(); C c; std::unique_ptr d = std::make_unique(); cout << "\nShowcase for scope end deletion:" << endl; cout << "A a;" << endl; for (int i=0; i<1; i++){ A a; } cout << "A* a = new A();" << endl; for (int i=0; i<1; i++){ A* a = new A(); } cout <<"Now A* using smart pointer:" << endl; for (int i=0; i<1; i++){ std::unique_ptr a = std::make_unique (); } cout << "\nShowcase for block scope:\n"; cout << "{A a;}\n"; { A a; } cout << "{A* a1 = new A();}\n"; { A* a1 = new A(); } cout << "\nreturn 0. Program finished!\n" << endl; return 0; }

destructors (end-of-scope)