std::isspace(std::locale) (3) - Linux Manuals

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

NAME

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