Method declaration and const

[sunrise]

Hi everybody,
I am new here. Nice to join our forum.
I have a question:
virtual void solve() const { }
What does this method do with const?
Thanks you in advance.

[kbw]

The const means that the function promises not to change any member variables. That can be overridden by declaring the such a variable as mutable.

[Bazzy]

It means that it doesn't modify the object from which is called ( so you can call it from const objects
eg:

struct Class
{
    void A() {} // not const
    void B() const {}
};

const Class object;
object.A(); // ERROR
object.B(); // OK