void (*var_changed) (struct dictionary *, int, void *);
void (*var_resized) (struct dictionary *, int, int, void *);
void (*weight_changed) (struct dictionary *, int, void *);
void (*var_changed) (struct dictionary *, int, void *);
void (*var_resized) (struct dictionary *, int, int, void *);
void (*weight_changed) (struct dictionary *, int, void *);