Thread: constructor

Hi all!
I'm writing a program in which I define a class named Point. the objects of the class are points of 2 numerical coordinates(x and y). I wanna write a constructor for my class with the following signature:
Point(int x,int y)
should I write anything in the body of my constructor or should I leave it empty?
I mean sth like this:

Code:

class Point
{
public:
int x,y;
Point(int x,int y)
    {
      Point::x=x;   
      Point::y=y;
     }
};

is it ok to do so?
I wanna tell the constructor to set the x and y attributes of the objects as written in the parenthesis that come after them. if I leave it's body empty, does it know to do such a thing?

If you're using initialization list syntax, the names of the arguments can be the same as the member names, and the compiler is smart enough to know what to do:

Code:

Point(int x, int y) : x(x), y(y) {}

Code:

Point(int x,int y)
    {
      Point::x=x;   
      Point::y=y;
     }
};

This would work if x and y were static, for non-static members, you could alternatively do this:

Code:

Point(int x,int y)
    {
      this->x=x;   
      this->y=y;
     }
};

The initialization list is the preferred way to do this in a constructor, but you can use this in any other place you need to differentiate a member variable from a local, for example.