C++17 STL Cookbook

How to do it...

In this recipe, we use the initializer syntax in both the supported contexts in order to see how they tidy up our code:

• The if statements: Imagine we want to find a character in a character map using the find method of std::map:

       if (auto itr (character_map.find(c)); itr != character_map.end()) {           // *itr is valid. Do something with it.       } else {           // itr is the end-iterator. Don't dereference.       }       // itr is not available here at all

• The switch statements: This is how it would look to get a character from the input and, at the same time, check the value in a switch statement in order to control a computer game:

       switch (char c (getchar()); c) {           case 'a': move_left();  break;           case 's': move_back();  break; case 'w': move_fwd(); ...