std::iscntrl(std::locale)

Defined in header <locale>

template< class charT >
bool iscntrl( charT ch, const locale& loc );

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

Parameters

ch	-	character
loc	-	locale

Return value

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

Possible implementation

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

Example

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

#include <iostream>
#include <locale>
int main()
{
    const wchar_t CCH = L'\u0094'; // Destructive Backspace in Unicode
  
    std::locale loc1("C");
    std::cout << "iscntrl(CCH, C locale) returned "
              << std::boolalpha << std::iscntrl(CCH, loc1) << '\n';
  
    std::locale loc2("en_US.UTF8");
    std::cout << "iscntrl(CCH, Unicode locale) returned "
              << std::boolalpha << std::iscntrl(CCH, loc2) << '\n';
}

Output:

iscntrl(CCH, C locale) returned false
iscntrl(CCH, Unicode locale) returned true

iscntrl	checks if a character is a control character (function)
iswcntrl	checks if a wide character is a control character (function)

std::iscntrl(std::locale)

Parameters

Return value

Possible implementation

Example

See also