Modern C++ Programming Cookbook

How to do it...

The following is a list of the typical operations you need to be aware of for working with shared_ptr and weak_ptr:

• Use one of the available overloaded constructors to create a shared_ptr that manages an object through a pointer. The default constructor creates an empty shared_ptr which does not manage any object:

        std::shared_ptr<int> pnull1;        std::shared_ptr<int> pnull2(nullptr);        std::shared_ptr<int> pi1(new int(42));        std::shared_ptr<int> pi2 = pi1;        std::shared_ptr<foo> pf1(new foo());        std::shared_ptr<foo> pf2(new foo(42, 42.0, "42"));

• Alternatively, use the std::make_shared() function template, available since C++11, for creating shared_ptr objects:

        std::shared_ptr<int> pi = std::make_shared<int>(42); std::shared_ptr<foo> ...