What the const modifier means after a method declaration - page 7

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Vasiliy Sokolov:

By the way, nobody has written that the Const modifier not only does not allow to change data inside its own class, but even to refer to non-constant methods.

Constant method- when it is fully worked out (it reaches all return in it), nothing will change with internal data. The compiler will inline a non-const method into a constant method and what will it become?