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

std::isblank(std::locale) – std::isblank(std::locale)

Synopsis

Defined in header<locale>

    template <class charT>
    (since C++ 11)

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

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

Parameters

ch – character
loc – locale

Return value

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

Possible implementation

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

Example

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

#include <iostream>

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

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

int main()

{
    const wchar_t IDEO_SPACE = L'\u3000'; // Unicode character 'IDEOGRAPHIC SPACE'
    try_with(IDEO_SPACE, "C");
    try_with(IDEO_SPACE, "en_US.UTF-8");
}

Output:

isblank(‘ ‘, locale("C")) returned false
isblank(‘ ‘, locale("en_US.UTF-8")) returned true

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