c++ cross-references
Author
I''ve got a problem using several class knowing each others :
class A {
B *_b;
C *_c;
};
class B {
A *_a;
C *_c;
}
class C {
A *_a;
B *_b;
};
each class is defined in its own .h file with #ifndef ... #define ... statements.
with 2 classes, I know how to solve it ; for each class head file, you have to first include a header file that just contains the 2 classes prototypes ( class A; classB; }.
But with 3 classes or more, it''s not so easy ; sometimes it works, sometimes not, and I dont understand why. The only solution I found is to define all classes in a single file, and to first write prototypes, but it''s really dirty !
I''ve been struggling with this trouble for months !!!
Please help !!!
Just put the forward declarations before the class definition that uses them (in the same header file):
(in a.h)class B;class C;class A {B *_b;C *_c;};(in b.h)class A;class C;class B {A *_a;C *_c;}etc...
Author
I did it, but it doesn''t work in the case your header file contains a method or a member of the class.
class B;
class A {
A( B *_b) { a = _b->b };
int a;
};
class B {
int b;
};
in my case, I was dealing with an inline function (for performances), and you have to write it in the header file.
class B;
class A {
A( B *_b) { a = _b->b };
int a;
};
class B {
int b;
};
in my case, I was dealing with an inline function (for performances), and you have to write it in the header file.
in that case you must put the functions on a cpp file and there include the b.h
just do:
class B;
class A {
A( B *_b);
int a;
};
class B {
int b;
};
//A.cpp//
#include "B.h"
inline A::A( B *_b)
{
a = _b->b
}
To be considered a genius you just have to say what everybody knows in a way very few understand
just do:
class B;
class A {
A( B *_b);
int a;
};
class B {
int b;
};
//A.cpp//
#include "B.h"
inline A::A( B *_b)
{
a = _b->b
}
To be considered a genius you just have to say what everybody knows in a way very few understand
Author
Sur you can do this ?
I think i tried, but the compiler "told" me i had to put inline functions in the header file.
Thx for your help !
I think i tried, but the compiler "told" me i had to put inline functions in the header file.
Thx for your help !
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