When have you used C++ 'mutable' keyword? [closed]

Answer 1

mutable keyword allows you to modify a variable inside a const context

e.g:

class Person {
private:
      mutable int age;

public:
    Person(int age) : age(age)  {

    }
    void setAge(int age) const {
        Person::age = age;
    }

    int getAge() const {
        return Person::age;
    }
};

int main() {

    Person person(23);
    std::cout << "Person age " << person.getAge() << std::endl;
    person.setAge(24);
    std::cout << "Person modified age " << person.getAge() << std::endl;
    return 0;
}