__istype
int __istype(__ct_rune_t, unsigned long);
return (__istype((wint_t)wc, (unsigned int)class));
__istype(wc, mask)); \
return (wc == 0 ? 0 : iswascii(wc) ? 1 : __istype(wc, 0xffffffffU));
return (__istype(wc, _CTYPE_E));
return (__istype(wc, class));