Std::isspace(std::locale) (3) Linux Manual Page

std::isspace(std::locale) – std::isspace(std::locale)

Synopsis

Defined in header<locale>

    template <class charT>

    bool isspace(charT ch, const locale &loc);

Checks if the given character is classified as a whitespace character by the given locale’s ctype facet.

Parameters

ch – character
loc – locale

Return value

Returns true if the character is classified as a whitespace character, false otherwise.

Possible implementation

  template< class charT >
  bool isspace( charT ch, const std::locale& loc ) {
      return std::use_facet<std::ctype<charT>>(loc).is(std::ctype_base::space, ch);
  }

Example

Demonstrates the use of isspace() with different locales (OS-specific).
// Run this code

#include <iostream>

#include <locale>
void try_with(wchar_t c, const char *loc)

{
    std::wcout << "isspace('" << c << "', locale(\"" << loc << "\")) returned "
               << std::boolalpha << std::isspace(c, std::locale(loc)) << '\n';
}
int main()

{
    const wchar_t EM_SPACE = L'\u2003'; // Unicode character 'EM SPACE'
    try_with(EM_SPACE, "C");
    try_with(EM_SPACE, "en_US.UTF8");
}

Output:

isspace(‘ ‘, locale("C")) returned false
isspace(‘ ‘, locale("en_US.UTF8")) returned true

std::isspace(std::locale) (3) Linux Manual Page