Originální popis anglicky:
iswctype - test character for a specified class
Návod, kniha: POSIX Programmer's Manual
#include <wctype.h>
int iswctype(wint_t
wc, wctype_t
charclass );
The
iswctype() function shall determine whether the wide-character code
wc has the character class
charclass, returning true or false.
The
iswctype() function is defined on WEOF and wide-character codes
corresponding to the valid character encodings in the current locale. If the
wc argument is not in the domain of the function, the result is
undefined. If the value of
charclass is invalid (that is, not obtained
by a call to
wctype() or
charclass is invalidated by a
subsequent call to
setlocale() that has affected category
LC_CTYPE
) the result is unspecified.
The
iswctype() function shall return non-zero (true) if and only if
wc has the property described by
charclass. If
charclass is 0,
iswctype() shall return 0.
No errors are defined.
The following sections are informative.
#include <wctype.h>
...
int yes_or_no;
wint_t wc;
wctype_t valid_class;
...
if ((valid_class=wctype("vowel")) == (wctype_t)0)
/* Invalid character class. */
yes_or_no=iswctype(wc,valid_class);
The twelve strings
"alnum" ,
"alpha" ,
"blank" ,
"cntrl" ,
"digit"
,
"graph" ,
"lower" ,
"print" ,
"punct" ,
"space"
,
"upper" , and
"xdigit" are reserved for
the standard character classes. In the table below, the functions in the left
column are equivalent to the functions in the right column.
iswalnum(wc) iswctype(wc, wctype("alnum"))
iswalpha(wc) iswctype(wc, wctype("alpha"))
iswblank(wc) iswctype(wc, wctype("blank"))
iswcntrl(wc) iswctype(wc, wctype("cntrl"))
iswdigit(wc) iswctype(wc, wctype("digit"))
iswgraph(wc) iswctype(wc, wctype("graph"))
iswlower(wc) iswctype(wc, wctype("lower"))
iswprint(wc) iswctype(wc, wctype("print"))
iswpunct(wc) iswctype(wc, wctype("punct"))
iswspace(wc) iswctype(wc, wctype("space"))
iswupper(wc) iswctype(wc, wctype("upper"))
iswxdigit(wc) iswctype(wc, wctype("xdigit"))
None.
None.
iswalnum() ,
iswalpha() ,
iswcntrl() ,
iswdigit() ,
iswgraph() ,
iswlower() ,
iswprint() ,
iswpunct()
,
iswspace() ,
iswupper() ,
iswxdigit() ,
setlocale() ,
wctype() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<wchar.h>,
<wctype.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
