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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/locale/isblank.html below:

std::isblank(std::locale) - cppreference.com

template< class CharT > bool isblank( CharT ch, const locale& loc );

(since C++11)

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

[edit] Parameters ch - character loc - locale [edit] Return value

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

[edit] Possible implementation [edit] Example

Demonstrates the use of isblank() with different locales (OS-specific).

#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");
}

Possible output:

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

[edit] See also checks if a character is a blank character
(function) [edit] checks if a wide character is a blank character
(function) [edit]

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