C++17 STL Cookbook

How to do it...

In this section, we will read all user input from standard input, which we will tokenize by whole sentences, and not words. Then we will collect all sentences in an std::multimap paired with a variable carrying their length. Afterward, we output all sentences, sorted by their length, back to the user.

1. As usual, we need to include all needed headers. std::multimap comes from the same header as std::map.

      #include <iostream>      #include <iterator>      #include <map>      #include <algorithm>

2. We use a lot of functions from namespace std, so we declare its use automatically.

      using namespace std;

3. When we tokenize strings by extracting what's between dot characters in the text, we will get text sentences surrounded by white space such ...