C: linked lists confusion

Question

error: dereferencing pointer to incomplete type
The problem line is "gl->point[0] = (struct list *)&foo;"
I read somewhere that I could be storing a declaration. If that is the case I need that explained to me.

struct ref {  
    char **name;
    struct list **point;
};

int main ( ) {   
    typedef struct {
        char **name;
        struct list **point;
    } temp;  

    struct ref *gl;  

    gl->name = malloc ( 1024 * sizeof(char *) );  
    gl->name[0] = "A";  

    temp foo;  
    foo.name = malloc ( 1024 * sizeof(char *) );  
    foo.name[0] = "B";  

    gl->point[0] = (struct list *)&foo;   

    printf ( "!%s!\n" , gl->point[0]->name[0] );  
}

Note that the typedef temp and the struct ref types are not the 'same type'; you should not repeat code like that. — Jonathan Leffler
– Jonathan Leffler, Commented Oct 3, 2010 at 15:16
Oh, I mistook all structs to be the same type. that helps a lot. — Jay
– Jay, Commented Oct 3, 2010 at 15:25

Pablo Santa Cruz · Accepted Answer · 2010-10-03 14:55:27Z

1

What's struct list? There is no type named struct list (at least in what you've shown).

Maybe you meant struct ref?

answered Oct 3, 2010 at 14:55

Pablo Santa Cruz

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Richard Harrison · Accepted Answer · 2010-10-03 14:56:28Z

0

Nowhere in the code sample are you defining struct list which is what the error is.

answered Oct 3, 2010 at 14:56

Richard Harrison

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