< cpp‎ | 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.


[edit] Parameters

ch - character
loc - locale

[edit] Return value

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

[edit] 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);

[edit] 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';

Possible output:

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

[edit] See also

checks if a character is a control character
(function) [edit]
checks if a wide character is a control character
(function) [edit]