To strukturer der indeholder pointere af hinandens typer?

Det havde hjulpet hvis du havde skrevet hvilken fejl du fik...

Måske er det fordi du skal forerklære den "anden" type

class B;

class A
{
  B* pB;
};

Koden ser således ud:

#################################################
fil1: edge.h
#################################################

#ifndef EDGE_H
#define EDGE_H

#include "vertice.h"

struct Vertice;

typedef struct strEdge
{
    Vertice*        pA;
    Vertice*        pB;
    unsigned char  distance;
}Edge;

int edgeAdd(int a, int b);

#endif

#################################################
fil2: vertice.h
#################################################

#ifndef VERTICE_H
#define VERTICE_H

#include "edge.h"

typedef struct Edge;

typedef struct strPoint
{
    int x;
    int y;
}Point;

typedef struct strVertice
{
    Point  pos;  /* vertice position relative to top left of tilemap */
    Edge*    edges[4];
}Vertice;

int verticeAdd(int a, int b);

#endif


Jeg har kun inkluderet h filerne da c filerne kun implementerer en "dummy" funktion.


Begge inkluderes i main.c

Output fra make all er følgende:

#make
gcc -g main.c edge.o vertice.o
In file included from vertice.h:4,
                from main.c:4:
edge.h:10: parse error before `Vertice'
edge.h:10: warning: no semicolon at end of struct or union
edge.h:11: warning: data definition has no type or storage class
edge.h:13: parse error before `}'
edge.h:13: warning: data definition has no type or storage class
In file included from main.c:4:
vertice.h:6: warning: useless keyword or type name in empty declaration
vertice.h:17: parse error before `Edge'
vertice.h:17: warning: no semicolon at end of struct or union
vertice.h:18: warning: data definition has no type or storage class
gmake: *** [myprogram] Error 1

Det letteste er at give "struct xxx" og xxx samme navn:
#ifndef EDGE_H
#define EDGE_H

struct Vertice;

typedef struct Edge
{
    Vertice*        pA;
    Vertice*        pB;
    unsigned char  distance;
}Edge;

int edgeAdd(int a, int b);

#endif

#ifndef VERTICE_H
#define VERTICE_H

struct Edge;

typedef struct Point
{
    int x;
    int y;
}Point;

typedef struct Vertice
{
    Point  pos;  /* vertice position relative to top left of tilemap */
    Edge*    edges[4];
}Vertice;

int verticeAdd(int a, int b);

#endif


Ellers bliver det til:
#ifndef EDGE_H
#define EDGE_H

struct strVertice;

typedef struct strEdge
{
    strVertice*        pA;
    strVertice*        pB;
    unsigned char  distance;
}Edge;

int edgeAdd(int a, int b);

#endif

#ifndef VERTICE_H
#define VERTICE_H

struct strEdge;

typedef struct strPoint
{
    int x;
    int y;
}Point;

typedef struct strVertice
{
    Point  pos;  /* vertice position relative to top left of tilemap */
    Edge*    edges[4];
}Vertice;

int verticeAdd(int a, int b);

#endif

Jeg skrev struct foran veriabelnavnet inde i strukturene. Så virker

det

=)

Hvem skal ha points?