C++17 STL Cookbook

How to do it...

We will implement a function that tries to be able to print everything. It uses std::any as its argument type:

1. First, we include some necessary headers and declare that we use the std namespace:

      #include <iostream>      #include <iomanip>      #include <list>      #include <any>      #include <iterator>           using namespace std;

2. In order to reduce the number of angle bracket syntax in the following program, we define an alias for list<int>, which we will use later:

      using int_list = list<int>;

3. Let's implement a function that claims to be able to print anything. The promise is that it prints anything provided as an argument in the form of an std::any variable:

      void print_anything(const std::any &a)      {

4. The first thing we need to check is ...