On: The Performance Impact of C++'s `final` Keyword

[bayindirh]

> If you have a `const int i` then the compiler can assume that i never changes.

Plus, you can’t even compile your code if you try to modify a const variable.

[account42 → bayindirh]

This isn't guaranteed: Modification after const cast on a const variable is ill formed but the compiler is not required to diagnose it - an generally it can't because it doesn't know what your reference/pointer points to.