It allows the differentiation of bitwise const and logical const. Logical const is when an object doesn’t change in a way that is visible through the public interface, like your locking example. Another example would be a class that computes a value the first time it is requested, and caches the result.
Since c++11 mutable
can be used on a lambda to denote that things captured by value are modifiable (they aren’t by default):
int x = 0; auto f1 = [=]() mutable {x = 42;}; // OK auto f2 = [=]() {x = 42;}; // Error: a by-value capture cannot be modified i
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