C++17 STL Cookbook

How it works...

There is not much left to say; most of it has been explained while implementing it as this program is very short. One thing we could elaborate on a bit is the fact that we used std::cin and an std::ifstream instance in a completely interchangeable way. The cin is of the std::istream type, and std::ifstream inherits from std::istream. Have a look at the class inheritance diagram at the beginning of this chapter. This way, they are completely interchangeable, even at runtime.

Keep your code modular by using stream abstractions. This helps decouple source code parts and makes your code easy to test because you can just inject any other matching type of stream.