C++17 STL Cookbook

How to do it...

In this section, we will implement a little tool that recursively iterates over a given directory. While doing that, it counts the number and size of all files, grouped by their extensions. Finally, it prints which filename extensions exist within that directory, how many there are per extension, and their average file size.

1. We need to include necessary headers and we declare that we use namespace std and filesystem.

      #include <iostream>      #include <sstream>      #include <iomanip>      #include <map>      #include <filesystem>           using namespace std;      using namespace filesystem;

2. The size_string function was already helpful in other recipes. It transforms file sizes to human-readable strings.

      static string size_string(size_t size)      { stringstream ...