Здравствуйте, shnyaps, Вы писали:

S>а можно ссыдку на стандарт?

7.1.5.1/4
Except that any class member declared mutable (7.1.1) can be modified, any attempt to modify a const
object during its lifetime (3.8) results in undefined behavior.

В 7.1.5.1/5 есть пример.