_isctype, iswctype, _isctype_l, _iswctype_l
Tests c for the ctype property specified by the desc argument. For each valid value of desc, there's an equivalent wide-character classification routine.
Syntax
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
);
Parameters
c
Integer to test.
desc
Property to test for. The property is normally retrieved using ctype or wctype.
locale
The locale to use for any locale-dependent tests.
Return value
_isctype and iswctype return a nonzero value if c has the property specified by desc in the current locale. Otherwise, they return 0. 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 isn't EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c isn't 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 |
Remarks
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
Requirements
| 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.
Libraries
All versions of the C run-time libraries.