NAME¶

std::iswprint - std::iswprint

Synopsis¶

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

Checks if the given wide character can be printed, i.e. it is either a number
(0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter
(abcdefghijklmnopqrstuvwxyz), a punctuation character
(!"#$%&'()*+,-./:;<=>?@[\]^_`{!}~), space or any printable 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 can be printed, zero otherwise.

Notes¶

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

Example¶

// Run this code

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

void demo_iswprint(std::string_view rem, const std::wint_t c)
{
std::cout << std::boolalpha << std::hex << std::showbase
<< rem << "iswprint('" << c << "') = "
<< !!std::iswprint(c) << '\n';
}

int main()
{
const wchar_t c1 = L'\u2002'; // en-space
const wchar_t c2 = L'\u0082'; // break permitted

demo_iswprint("In default locale:\n", c1);

std::setlocale(LC_ALL, "en_US.utf8");
demo_iswprint("In Unicode locale:\n", c1);
demo_iswprint("", c2);
}

Possible output:¶

In default locale:
iswprint('0x2002') = false
In Unicode locale:
iswprint('0x2002') = true
iswprint('0x82') = false

See also¶

isprint(std::locale) checks if a character is classified as printable by a locale
(function template)
isprint checks if a character is a printing character
(function)
C documentation for
iswprint

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)