C++17 STL Cookbook

How to do it...

We will play with std::ostream_iterator by enabling for combination with a new custom class and have a look into its implicit conversion capabilities, which can help us with printing:

1. The include files come first and then we declare that we use the std namespace by default:

      #include <iostream>      #include <vector>      #include <iterator>      #include <unordered_map>      #include <algorithm>            using namespace std;

2. Let's implement a transformation function, which maps numbers to strings. It shall return "one" for the value 1, "two" for the value 2, and so on:

      string word_num(int i) {

3. We fill a hash map with the mappings we need in order to access them later:

          unordered_map<int, string> m {              {1, "one"}, {2, "two"}, {3, "three"}, {4, ...