problem defining = operator
Author
Hey. From the code it is easy to see what I'm trying to do. But this isn't working!
I get the error: "
C:\Users\Remy\Documents\CPP Enterprise game\geometry.h|43|error: no match for 'operator=' in '((Rect*)this)->Rect::start = (((Vector2D*)operator new(16u)), (<anonymous>->Vector2D::Vector2D(), <anonymous>))"
Code:
class Vector2D {
public:
double x;
double y;
public: Vector2D& operator= (const Vector2D& param) {
x=param.x;
y=param.y;
return *this;
}
};
class Rect {
public:
Vector2D start;
Vector2D end;
Rect() {start = new Vector2D(); end = new Vector2D();}
};
Because new returns pointers to Vector2D's, but you have full objects, not pointers. This is unrelated to operator=().
C++ uses value semantics: the members are created when the object is created. The default constructor, as well as the default assignment operator, already do what you need. Therefore, you could simply write:
I changed "class Foo { public:" to "struct Foo {" because it's shorter.
struct Vector2D { double x; double y;};struct Rect { Vector2D start; Vector2D end;};I changed "class Foo { public:" to "struct Foo {" because it's shorter.
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
