std::iswalnum
From cppreference.com
| Defined in header <cwctype>
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int iswalnum( std::wint_t ch );
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Checks if the given wide character is an alphanumeric character, i.e. either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz) or any alphanumeric character 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 an alphanumeric character, zero otherwise.
Notes
ISO 30112 specifies which Unicode characters are included in the POSIX alnum category.
Example
Run this code
#include <clocale>
#include <cwctype>
#include <iostream>
int main()
{
wchar_t c = L'\u13ad'; // the Cherokee letter HA ('Ꭽ')
std::cout << std::hex << std::showbase << std::boolalpha;
std::cout << "in the default locale, iswalnum(" << (std::wint_t)c << ") = "
<< (bool)std::iswalnum(c) << '\n';
std::setlocale(LC_ALL, "en_US.utf8");
std::cout << "in Unicode locale, iswalnum(" << (std::wint_t)c << ") = "
<< (bool)std::iswalnum(c) << '\n';
}
Possible output:
in the default locale, iswalnum(0x13ad) = false
in Unicode locale, iswalnum(0x13ad) = true
See also
| checks if a character is classified as alphanumeric by a locale (function template) | |
| checks if a character is alphanumeric (function) | |
C documentation for iswalnum
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