NAME¶

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

See also¶

isblank checks if a character is a blank character
(C++11) (function)
iswblank checks if a wide character is a blank character
(C++11) (function)