C++17 STL Cookbook

How to do it...

We will implement very simple string filter predicates, and then we will combine them with a little helper function that does the combination for us in a generic way.

1. As always, we'll include some headers first:

      #include <iostream>      #include <functional>      #include <string>      #include <iterator>      #include <algorithm>

2. Because we are going to need them later, we implement two simple predicate functions. The first one tells if a string begins with the character 'a' and the second one tells if a string ends with the character 'b':

      static bool begins_with_a (const std::string &s)      {          return s.find("a") == 0;      }      static bool ends_with_b (const std::string &s)      {          return s.rfind("b") == s.length() - 1;      }

3. Now, let's implement a helper ...