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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/header/cwctype.html below:

Standard library header <cwctype> - cppreference.com

This header was originally in the C standard library as <wctype.h>.

This header is part of the C-style null-terminated wide strings library.

[edit] Types wctrans_t scalar type that holds locale-specific character mapping wctype_t scalar type that holds locale-specific character classification wint_t integer type that can hold any valid wide character and at least one more value [edit] Macros a non-character value of type wint_t used to indicate errors
(macro constant) [edit] Functions Character classification checks if a wide character is alphanumeric
(function) [edit] checks if a wide character is alphabetic
(function) [edit] checks if a wide character is lowercase
(function) [edit] checks if a wide character is an uppercase character
(function) [edit] checks if a wide character is a digit
(function) [edit] checks if a wide character is a hexadecimal character
(function) [edit] checks if a wide character is a control character
(function) [edit] checks if a wide character is a graphical character
(function) [edit] checks if a wide character is a space character
(function) [edit] checks if a wide character is a blank character
(function) [edit] checks if a wide character is a printing character
(function) [edit] checks if a wide character is a punctuation character
(function) [edit] classifies a wide character according to the specified LC_CTYPE category
(function) [edit] looks up a character classification category in the current C locale
(function) [edit] Character manipulation converts a wide character to lowercase
(function) [edit] converts a wide character to uppercase
(function) [edit] performs character mapping according to the specified LC_CTYPE mapping category
(function) [edit] looks up a character mapping category in the current C locale
(function) [edit]

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