Constructors with default parameters in Header files

Question

I have a cpp file like this:

#include Foo.h; Foo::Foo(int a, int b=0) {     this->x = a;     this->y = b; } 

How do I refer to this in Foo.h?

Answer 1

.h:

class Foo {     int x, y;     Foo(int a, int b=0); }; 

.cc:

#include "foo.h"  Foo::Foo(int a,int b)     : x(a), y(b) { } 

You only add defaults to declaration, not implementation.