C++17 STL Cookbook

How it works...

There were three specialties in this recipe. One was that we did not fill a normal vector or a list from a serial character stream, but a more complex container like std::map. The other was that we used those magic quoted stream manipulators. And the last was the accumulate call, which finds out the largest key string size.

Let's start with the map part. Our struct meme only contains a description field and year. The name of the Internet meme is not part of this structure because it is used as the key for the map. When we insert something into a map, we can provide an std::pair with a key type and a value type. This is what we did. We first implemented stream operator>> for struct meme, and then we did the same for pair<string, ...