includes

[madshov]

Hi,

How do I properly include classes that are dependable of each other, without getting an error that the compiler don't knoe anything about one of the classes?
Ex:

vector.h

class Vector
{
     public:
...
    Vector operator*(const Matrix& m) const;
}

matrix.h

class Matrix
{
...
       Vector operator* (const Vector& v) const;
}

thanks

[arnaudk]

Don't include vector.h in matrix.c/matrix.h because then you will get interdependency errors.... Instead, if you don't call methods/members of vector in matrix, you only need to tell the compiler in matrix.h that there exists a class class vector, without fleshing out the details (and vice-versa for vector.h):

//vector.h:
class Matrix; // declaration only: Matrix is a class
class Vector
{
     public:
    Vector operator*(const Matrix& m) const;
}
 
//matrix.h:
class Vector; // declaration only: Vector is a class
class Matrix
{
...
       Vector operator* (const Vector& v) const;
}
 

[madshov]

Yes of course! Now I see. Thanks for clarifying.