C++17 STL Cookbook

How to do it...

We will implement a program that maintains objects with shared_ptr instances, and then, we mix in weak_ptr to see how this changes the behavior of smart pointer memory handling:

1. At first, we include the necessary headers and declare that we use the std namespace by default:

      #include <iostream>      #include <iomanip>      #include <memory>            using namespace std;

2. Next, we implement a class that prints a message in its destructor implementation. This way, we can simply check when an item is actually destroyed later in the program output:

      struct Foo {          int value;                Foo(int i) : value{i} {}          ~Foo() { cout << "DTOR Foo " << value << '\n'; }      };

3. Let's also implement a function that prints information about a weak pointer, so we can print ...