std::iswcntrl
From cppreference.com
| Defined in header <cwctype>
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int iswcntrl( std::wint_t ch );
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Checks if the given wide character is a control character, i.e. codes 0x00-0x1F and 0x7F and any control characters specific to the current locale.
If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined.
Parameters
| ch | - | wide character |
Return value
Non-zero value if the wide character is a control character, zero otherwise.
Notes
ISO 30112 defines POSIX control characters as Unicode characters U+0000..U+001F, U+007F..U+009F, U+2028, and U+2029 (Unicode classes Cc, Zl, and Zp).
Example
Run this code
#include <clocale>
#include <cwctype>
#include <iostream>
int main()
{
wchar_t c = L'\u2028'; // the Unicode character "line separator"
std::cout << std::hex << std::showbase << std::boolalpha;
std::cout << "in the default locale, iswcntrl(" << (std::wint_t)c << ") = "
<< (bool)std::iswcntrl(c) << '\n';
std::setlocale(LC_ALL, "en_US.utf8");
std::cout << "in Unicode locale, iswcntrl(" << (std::wint_t)c << ") = "
<< (bool)std::iswcntrl(c) << '\n';
}
Output:
in the default locale, iswcntrl(0x2028) = false
in Unicode locale, iswcntrl(0x2028) = true
See also
| checks if a character is classified as a control character by a locale (function template) | |
| checks if a character is a control character (function) | |
C documentation for iswcntrl
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