C: Function pointer inside a typedef struct

Question

I am trying to create a linked list in C but trying to pack it nicely in somewhat of a C++ style class. I am having some issues however using function pointers in C.

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Answer 1

Well you can't add a default value in the declaration of the struct but what you can do is:

• Create a function to initialize the linkedList instance - I guess you've seen that in C style libraries
• Create a default list item and use that when creating new entities.

Like:

void addMSG(unsigned char *data, int size, struct linkedList *self);

struct linkedList {
    int count;
    struct msgNode *front;
    struct msgNode *back;
    void (*addMSG)(unsigned char *, int, struct linkedList *);
} DefaultList = {0, NULL, NULL, addMSG};