Answer Posted / shakti singh khinchi

Mutable keyword is used to modify a data member of an object
which has declared as constant. for example:

class XYZ
{
public:
int i;
mutable int cc;
public:
XYZ();
};

int main()
{
const XYZ obj;
obj.cc = 100; // modify obj object's member "cc" which has
been declared as mutable.
}

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