[wott]

Nothing guarantees that it is zero-overhead, it all depends on the efforts, quality and mood of the C++ compiler. Whereas in C you can at least rely on the fact that even without any complex optimisation it will at worst produce machine code that looks 99% like the C code, because it maps 1 -> 0.99. Good luck telling what is the complexity hidden behind a C++ operator.

[eliangidoni]

Right, that was my point. You have to use time/effort on understanding the compiler workings, time that could be used to focus on your actual problem and features implementation. For firmware I wouldn't.