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+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" This is free documentation; you can redistribute it and/or
+.\" modify it under the terms of the GNU General Public License as
+.\" published by the Free Software Foundation; either version 2 of
+.\" the License, or (at your option) any later version.
+.\"
+.\" References consulted:
+.\"   GNU glibc-2 source code and manual
+.\"   Dinkumware C library reference http://www.dinkumware.com/
+.\"   OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
+.\"   ISO/IEC 9899:1999
+.\"
+.TH ISWDIGIT 3  1999-07-25 "GNU" "Linux Programmer's Manual"
+.SH NAME
+iswdigit \- test for decimal digit wide character
+.SH SYNOPSIS
+.nf
+.B #include <wctype.h>
+.sp
+.BI "int iswdigit(wint_t " wc );
+.fi
+.SH DESCRIPTION
+The \fBiswdigit\fP function is the wide-character equivalent of the
+\fBisdigit\fP function. It tests whether \fIwc\fP is a wide character
+belonging to the wide character class "digit".
+.PP
+The wide character class "digit" is a subclass of the wide character class
+"xdigit", and therefore also a subclass of the wide character class "alnum", of
+the wide character class "graph" and of the wide character class "print".
+.PP
+Being a subclass of the wide character class "print", the wide character class
+"digit" is disjoint from the wide character class "cntrl".
+.PP
+Being a subclass of the wide character class "graph", the wide character class
+"digit" is disjoint from the wide character class "space" and its subclass
+"blank".
+.PP
+Being a subclass of the wide character class "alnum", the wide character class
+"digit" is disjoint from the wide character class "punct".
+.PP
+The wide character class "digit" is disjoint from the wide character class
+"alpha" and therefore also disjoint from its subclasses "lower", "upper".
+.PP
+The wide character class "digit" always contains exactly the digits '0' to '9'.
+.SH "RETURN VALUE"
+The \fBiswdigit\fP function returns non-zero if \fIwc\fP is a wide character
+belonging to the wide character class "digit". Otherwise it returns zero.
+.SH "CONFORMING TO"
+ISO/ANSI C, UNIX98
+.SH "SEE ALSO"
+.BR isdigit (3),
+.BR iswctype (3)
+.SH NOTES
+The behaviour of \fBiswdigit\fP depends on the LC_CTYPE category of the
+current locale.