Function pointer as a member of a C struct

Question

I have a struct as follows, with a pointer to a function called \"length\" that will return the length of the chars member.

typedef struct pstring_t {
    ch         


        

Answer 1

My guess is that part of your problem is the parameter lists not matching.

int (* length)();

and

int length(PString * self)

are not the same. It should be int (* length)(PString *);.

...woah, it's Jon!

Edit: and, as mentioned below, your struct pointer is never set to point to anything. The way you're doing it would only work if you were declaring a plain struct, not a pointer.

str = (PString *)malloc(sizeof(PString));