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_isctype, iswctype, _isctype_l, _iswctype_l

Tests c for the property specified by the desc argument. For each valid value of desc, there is an equivalent wide-character classification routine.

int _isctype(
   int c,
   _ctype_t desc
);
int _isctype_l(
   int c,
   _ctype_t desc,
   _locale_t locale
);
int iswctype(
   wint_t c,
   wctype_t desc 
);
int _iswctype_l(
   wint_t c,
   wctype_t desc,
   _locale_t locale
);

c

Integer to test.

desc

Property to test for. This is normally retrieved using ctype or wctype.

locale

The locale to use for any locale-dependent tests.

_isctype and iswctype return a nonzero value if c has the property specified by desc in the current locale or 0 if it does not. The versions of these functions with the _l suffix are identical except that they use the locale passed in instead of the current locale for their locale-dependent behavior. For more information, see Locale.

The behavior of _isctype and _isctype_l is undefined if c is not EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c is not one of these values, the functions raise an assertion.

Generic-Text Routine Mappings

Tchar.h routine

_UNICODE and _MBCS not defined

_MBCS defined

_UNICODE defined

n/a

_isctype

n/a

_iswctype

n/a

_isctype_l

n/a

_iswctype_l

Routine

Required header

_isctype

<ctype.h>

iswctype

<ctype.h> or <wchar.h>

_isctype_l

<ctype.h>

_iswctype_l

<ctype.h> or <wchar.h>

For more compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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