std::iswspace (3) - Linux Man Pages

std::iswspace: std::iswspace

NAME

std::iswspace - std::iswspace

Synopsis


Defined in header <cwctype>
int iswspace( wint_t ch );


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 <iostream>
  #include <clocale>
  #include <cwctype>
  void try_with(wchar_t c, const char* loc)
  {
      std::setlocale(LC_ALL, loc);
      std::wcout << "isspace('" << c << "') in " << loc << " locale returned "
                 << std::boolalpha << (bool)std::iswspace(c) << '\n';
  }
  int main()
  {
      wchar_t EM_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


                     checks if a character is classified as whitespace by a locale
isspace(std::locale) (function template)
                     checks if a character is a space character
isspace (function)


ASCII values iscntrl isprint isspace isblank isgraph ispunct isalnum isalpha isupper islower isdigit isxdigit
decimal hexadecimal octal characters iswcntrl iswprint iswspace iswblank iswgraph iswpunct iswalnum iswalpha iswupper iswlower iswdigit iswxdigit


0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) ≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 tab (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
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–\10ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0
71–90 \x47–\x5A \107–\13GHIJKLMNOP 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0
                              QRSTUVWXYZ
91–96 \x5B–\x60 \133–\14[\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
97–102\x61–\x66 \141–\14abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0
103–12\x67–\x7A \147–\17ghijklmnop 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
                              qrstuvwxyz
123–12\x7B–\x7E \172–\17{|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
127 \x7F \177 backspace character (DEL) ≠0 0 0 0 0 0 0 0 0 0 0 0