Constructors with inheritance in c++
- by Crystal
If you have 3 classes, with the parent class listed first
shape- 2d shapes, 3d shapes - circle, sphere
When you write your constructor for the circle class, would you ever just initialize the parent Shape object and then your current object, skipping the middle class. It seems to me you could have x,y coordinates for Shape and initialize those in the constructor, and initialize a radius in the circle or sphere class, but in 2d or 3d shape classes, I wouldn't know what to put in the constructor since it seems like it would be identical to shape. So is something like this valid
Circle::Circle(int x, int y, int r) : Shape(x, y), r(r) {}
I get a compile error of:
illegal member initialization: 'Shape' is not a base or member
So I wasn't sure if my code was legal or best practice even. Or if instead you'd have the middle class just do what the top level Shape class does
TwoDimensionalShape::TwoDimensionalShape(int x, int y) : Shape (x, y) {}
and then in the Circle class
Circle::Circle(int x, int y, int r) : TwoDimensionalShape(x, y), r(r) {}
