What does a mutable member of a class mean?a)A member that can never be changedb)A member that can be updated only if it not a member of constant objectc)A member that can be updated even if it a member of constant objectd)A member that is global throughout the classCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Mutable members are those which can be updated even if it a member of a constant object. You can change their value even from a constant member function of that class.

Answer

Explanation:

Mutable Member of a Class:
A mutable member of a class refers to a member variable that can be updated or modified even if it is a part of a constant object.

Rules for Mutable Members:
- Mutable members can be modified regardless of whether they are part of a constant object or not.
- Constant objects may restrict the modification of their members, but mutable members can still be updated.

Example:
cpp
class MyClass {
public:
mutable int mutableMember; // Mutable member variable
int regularMember; // Non-mutable member variable
};
int main() {
const MyClass obj1; // Constant object
obj1.mutableMember = 10; // Allowed since mutable
// obj1.regularMember = 20; // Not allowed as obj1 is constant
MyClass obj2; // Non-constant object
obj2.mutableMember = 30; // Allowed
obj2.regularMember = 40; // Allowed
}
In the above example, `mutableMember` is a mutable member of the class `MyClass`. It can be modified even in a constant object like `obj1`. On the other hand, `regularMember` cannot be modified in a constant object.
Therefore, a mutable member of a class allows for flexibility in updating member variables, even in situations where object constancy is enforced.

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