Code style #8
Description
Pick one indentation rule for your code. Use only that indentation rule. Use it everywhere in your code (never mind what third-party dependencies do). In general, that applies to everything to do with basic code style; pick one rule (there are many viable options; I have my favourites but it's not my code) and stick to it.
Using a single style helps your code be a lot easier to read. Most of your code seems to be using 4 spaces as the basic indentation unit, which is good, but it definitely isn't universal and that makes things look very sloppy.
There are multiple options for doing code style enforcement. It's a much messier topic in C++ (and C) than in some other languages. However, until you have defined rules for what things ought to be like, enforcement in any form is impossible.