From cppreference.com
intiswspace(wint_tch);Checks if the given wide character is a wide whitespace character as classified by the currently installed C locale. In the default locale, the whitespace characters are the following:
Space (0x20, ' ')
Form feed (0x0c, '\f')
Line feed (0x0a, '\n')
Carriage return (0x0d, '\r')
Horizontal tab (0x09, '\t')
Vertical tab (0x0b, '\v').
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 is a whitespace character, zero otherwise.
Notes
ISO 30112 defines POSIX space characters as Unicode characters U+0009..U+000D, U+0020, U+1680, U+180E, U+2000..U+2006, U+2008..U+200A, U+2028, U+2029, U+205F, and U+3000.
Example
Demonstrates the use of iswspace with different locales.
Run this code
#include<clocale>#include<cwctype>#include<iostream>voidtry_with(wchar_tc,constchar*loc){std::setlocale(LC_ALL,loc);std::wcout<<"isspace('"<<c<<"') in "<<loc<<" locale returned "<<std::boolalpha<<static_cast<bool>(std::iswspace(c))<<'\n';}intmain(){constwchar_tEM_SPACE=L'\u2003';// Unicode character 'EM SPACE'try_with(EM_SPACE,"C");try_with(EM_SPACE,"en_US.UTF8");}Output:
isspace(' ') in C locale returned false isspace(' ') in en_US.UTF8 locale returned true See also
ASCII values characters
decimal hexadecimal octal 0–8 \x0–\x8\0–\10control codes (NUL, etc.) ≠0000000000009 \x9\11tab (\t) ≠00≠0≠00000000010–13 \xA–\xD\12–\15whitespaces (\n, \v, \f, \r) ≠00≠000000000014–31 \xE–\x1F\16–\37control codes ≠00000000000032 \x20\40space 0≠0≠0≠00000000033–47 \x21–\x2F\41–\57!"#$%&'()*+,-./0≠000≠0≠000000048–57 \x30–\x39\60–\7101234567890≠000≠00≠0000≠0≠058–64 \x3A–\x40\72–\100:;<=>?@0≠000≠0≠000000065–70 \x41–\x46\101–\106ABCDEF0≠000≠00≠0≠0≠000≠071–90 \x47–\x5A\107–\132GHIJKLMNOP
QRSTUVWXYZ0≠000≠00≠0≠0≠000091–96 \x5B–\x60\133–\140[\]^_`0≠000≠0≠000000097–102 \x61–\x66\141–\146abcdef0≠000≠00≠0≠00≠00≠0103–122 \x67–\x7A\147–\172ghijklmnop
qrstuvwxyz0≠000≠00≠0≠00≠000123–126 \x7B–\x7E\172–\176{|}~0≠000≠0≠0000000127 \x7F\177backspace character (DEL) ≠000000000000