Can't define ++ operator in C++, what's the issue here?

Question

I\'m working through Bjarne Stroustrup\'s The C++ Programming Language and I\'m stuck on one of the examples. Here\'s the code, and aside from whitespace differences and comment

Answer 1

You have a couple of problems:

First, you are attempting to implement a function (operator++) inside another function (main). C++ does not allow this (with the exception of lambdas).

Second, you are only implementing a prefix increment, so ++light will work, but light++ will not. You should implement them both. An example of it can be found here.