To encapsulate the class, and make methods be able to apply directly on an object, we need the following design, a constructor that has the attributes as pointers to functions, for example
struct Map *Map_new() {
struct Map *p = malloc(sizeof(*p));
p->__head = NULL;
p->__tail = NULL;
p->__count = 0;
p->put = &__Map_put;
p->get = &__Map_get;
p->size = &__Map_size;
p->dump = &__Map_dump;
p->del = &__Map_del;
p->iter = &__Map_iter;
return p;
}
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