Re: how do you compile 2 classes that include each other?

[Frank Buss]

briforge wrote...
> When I compile the Edge2 class, I get this error:
>
> In file included from Edge2.cpp:6:
> Vertex2.cpp:18: `Edge2' was not declared in this scope
> Vertex2.cpp:18: parse error before `>'

Don't mix declaration and implementation. With forward declaration you can
do the following, if you only use pointers as member variables and use
references as arguments. I have no answer what to do, if you have in both
classes member variables of the other class, which are not pointers :o) ,
any ideas?

For your case the following should do it, I hope:

Edge.h:

#ifndef EDGE_H
#define EDGE_H

class Vertex;

class Edge
{
...
Edge(const Vertex& startV...);
...
};

#endif

Vertex.h:

#ifndef VERTEX_H
#define VERTEX_H

class Edge;

class Vertex
{
...
vector<Edge*> edges;
...
};

#endif

Edge.cpp:

#include "Edge.h"
#include "Vertex.h"

...

Vertex.cpp:

#include "Edge.h"
#include "Vertex.h"

...


Regards,

Frank

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