rate_compfunc
&rate_sizefunc, &rate_compfunc, &rate_delkeyfunc,
int rate_compfunc(void* key1, void* key2);
else if(fptr == &rate_compfunc) return 1;
&rate_sizefunc, &rate_compfunc, &rate_delkeyfunc,
int rate_compfunc(void* key1, void* key2);
else if(fptr == &rate_compfunc) return 1;