# std::wctype

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< cpp‎ | string‎ | wide

Defined in header `<cwctype>` |  |
std::wctype_t wctype( const char* str ); |  |

Constructs a value of type std::wctype_t that describes a LC_CTYPE category of wide character classification. It may be one of the standard classification categories, or a locale-specific category, such as `"jkanji"`.

### Parameters

str | - | C string holding the name of the desired category

The following values of `str` are supported in all C locales:

value of `str` | effect
`"alnum"` | identifies the category used by std::iswalnum
`"alpha"` | identifies the category used by std::iswalpha
`"blank"` | identifies the category used by std::iswblank (C++11)
`"cntrl"` | identifies the category used by std::iswcntrl
`"digit"` | identifies the category used by std::iswdigit
`"graph"` | identifies the category used by std::iswgraph
`"lower"` | identifies the category used by std::iswlower
`"print"` | identifies the category used by std::iswprint
`"space"` | identifies the category used by std::iswspace
`"upper"` | identifies the category used by std::iswupper
`"xdigit"` | identifies the category used by std::iswxdigit

### Return value

std::wctype_t object suitable for use with std::iswctype to classify wide characters according to the named category of the current C locale or zero if `str` does not name a category supported by the current C locale.

### See also

iswctype | classifies a wide character according to the specified LC_CTYPE category (function)
C documentation for wctype

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