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| // unique_ptr::get vs unique_ptr::release #include <iostream> #include <memory> int main () { // foo bar p // --- --- --- std::unique_ptr<int> foo; // null std::unique_ptr<int> bar; // null null int* p = nullptr; // null null null foo = std::unique_ptr<int>(new int(10)); // (10) null null bar = std::move(foo); // null (10) null p = bar.get(); // null (10) (10) *p = 20; // null (20) (20) p = nullptr; // null (20) null foo = std::unique_ptr<int>(new int(30)); // (30) (20) null p = foo.release(); // null (20) (30) *p = 40; // null (20) (40) std::cout << "foo: "; if (foo) std::cout << *foo << '\n'; else std::cout << "(null)\n"; std::cout << "bar: "; if (bar) std::cout << *bar << '\n'; else std::cout << "(null)\n"; std::cout << "p: "; if (p) std::cout << *p << '\n'; else std::cout << "(null)\n"; std::cout << '\n'; delete p; // the program is now responsible of deleting the object pointed to by p // bar deletes its managed object automatically return 0; }
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