Standard C++ Library Reference ISO/IEC (VERSION3)

iswalnum
int iswalnum(wint_t c);
The function returns nonzero if c is any of:
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9
or any other locale-specific alphabetic character.
iswalpha
int iswalpha(wint_t c);
The function returns nonzero if c is any of:
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or any other locale-specific alphabetic character.
iswcntrl
int iswcntrl(wint_t c);
The function returns nonzero if c is any of:
BEL BS CR FF HT NL VT
or any other implementation-defined control character.
iswctype
int iswctype(wint_t c, wctype_t category);
The function returns nonzero if c is any character in the category category. The value of
category must have been returned by an earlier successful call to wctype.
iswdigit
int iswdigit(wint_t c);
The function returns nonzero if c is any of:
0 1 2 3 4 5 6 7 8 9