NAME¶

std::iswgraph - std::iswgraph

Synopsis¶

Defined in header <cwctype>
int iswgraph( std::wint_t ch );

Checks if the given wide character has a graphical representation, i.e. it is either
a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase
letter (abcdefghijklmnopqrstuvwxyz), a punctuation character
(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~) or any graphical character specific to the
current C locale.

If the value of ch is neither representable as a wchar_t nor equal to the value of
the macro WEOF, the behavior is undefined.

Parameters¶

ch - wide character

Return value¶

Non-zero value if the wide character has a graphical representation character, zero
otherwise.

Notes¶

ISO 30112 specifies which Unicode characters are include in POSIX graph category.

Example¶

// Run this code

#include <clocale>
#include <cwctype>
#include <iostream>

int main()
{
wchar_t c = L'\u2602'; // the Unicode character Umbrella ('☂')

std::cout << std::hex << std::showbase << std::boolalpha
<< "in the default locale, iswgraph("
<< static_cast<std::wint_t>(c) << ") = "
<< static_cast<bool>(std::iswgraph(c)) << '\n';

std::setlocale(LC_ALL, "en_US.utf8");
std::cout << "in Unicode locale, iswgraph("
<< static_cast<std::wint_t>(c) << ") = "
<< static_cast<bool>(std::iswgraph(c)) << '\n';
}

Output:¶

in the default locale, iswgraph(0x2602) = false
in Unicode locale, iswgraph(0x2602) = true

See also¶

isgraph(std::locale) checks if a character is classified as graphical by a locale
(function template)
isgraph checks if a character is a graphical character
(function)
C documentation for
iswgraph

ASCII values characters iscntrl isprint isspace isblank isgraph ispunct isalnum isalpha isupper islower isdigit isxdigit decimal hexadecimal octal iswcntrl iswprint iswspace iswblank iswgraph iswpunct iswalnum iswalpha iswupper iswlower iswdigit iswxdigit 0–8 \x0–\x8 \0–\10 control codes ≠0 0 0 0 0 0 0 0 0 0 0 0
(NUL, etc.) 9 \x9 \11 tab (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
whitespaces 10–13 \xA–\xD \12–\15 (\n, \v, \f, ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
\r) 14–31 \xE–\x1F \16–\37 control codes ≠0 0 0 0 0 0 0 0 0 0 0 0 32 \x20 \40 space 0 ≠0 ≠0 ≠0 0 0 0 0 0 0 0 0 33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 48–57 \x30–\x39 \60–\71 0123456789 0 ≠0 0 0 ≠0 0 ≠0 0 0 0 ≠0 ≠0 58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 65–70 \x41–\x46 \101–\106 ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0 71–90 \x47–\x5A \107–\132 GHIJKLMNOP 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0
QRSTUVWXYZ 91–96 \x5B–\x60 \133–\140 [\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 97–102 \x61–\x66 \141–\146 abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0 103–122 \x67–\x7A \147–\172 ghijklmnop 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
qrstuvwxyz 123–126 \x7B–\x7E \172–\176 {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 127 \x7F \177 backspace ≠0 0 0 0 0 0 0 0 0 0 0 0
character (DEL)