function inside a struct

//---- test function inside struct
typedef struct try {
    void (*init)();
    void (*set)();
    void (*print)();
    int x,y;
} foo;

void init(foo *p)
{
    p->x=0;
    p->y=0;
}

void set(foo *p, int x, int y)
{
    p->x = x;
    p->y = y;
}

void print(foo *p)
{
    printf("x=%d, y=%d\n\r", p->x, p->y);
}

foo *initialize(void)
{
    foo *p   = (foo*)malloc(sizeof(foo));
    p->init  = init;
    p->set   = set;
    p->print = print;
   
    return p;
}

//-------------------------------------
//----- test

foo *p = initialize();
p->init(p);
p->set(p, 10, 2);
p->print(p);
p->set(p, 15, 12);
p->print(p);