Why is the mutable keyword needed in C++? Only for const methods?

Hi everyone! I'm learning C++ and came across the `mutable` keyword. Textbooks say it allows modifying a class member even in `const` methods. But this seems strange to me — why would you want to change anything in a method that is marked as const? Doesn't this violate the whole idea of constness? Here's an example I wrote: ```cpp class Counter { private: mutable int accessCount = 0; int value = 0; public: int getValue() const { accessCount++; // works because of mutable return value; } int getAccessCount() const { return accessCount; } }; ``` I understand that `accessCount` is a counter for getter calls. But wouldn't it be better to just remove `const` from the `getValue()` method? Or use `const_cast`? It seems to me that `mu