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

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

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 [edit] Example

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

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]

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