About the constness of a class

[easonyoyo]

Hi guys, I have a question about the constness of a class.

If I declare a class to be const, can I access to its member function which may change its value?

For example:

class Point{
public:
     Point(int x, int y);
     void setX(int newvalue);
};

void main(){
     const Point a(1,3);
     a.setX(100);
}

Can I do that?

[AbstractionAnon]

No. The fact that you declared a const means you can't modify a's contents.

PLEASE USE CODE TAGS (the <> formatting button) when posting code.
It makes it easier to read your code and also easier to respond to your post.
http://www.cplusplus.com/articles/jEywvCM9/
Hint: You can edit your post, highlight your code and press the <> formatting button.

[helios]

First, a correction in terminology. A class can't be const. const Point a(1,3); declares a constant object, or constant instance of the class Point.

Second, no. Non-const member functions can't be called on const instances. const member functions can, but they are not allowed to modify the contents of the instance.

[easonyoyo]

Thank you very much guys!

I'm new to the forum and it's my first posted topic.

My next topic will highlight my code.