| Defined in header <locale> | ||
|---|---|---|
template< class charT > bool isalnum( charT ch, const locale& loc ); |
Checks if the given character classified as an alphanumeric character by the given locale's std::ctype facet.
Parameters
| ch | - | character |
| loc | - | locale |
Return value
Returns true if the character is classified as alphanumeric, false otherwise.
Possible implementation
template< class charT >
bool isalnum( charT ch, const std::locale& loc ) {
return std::use_facet<std::ctype<charT>>(loc).is(std::ctype_base::alnum, ch);
} |
Example
Demonstrates the use of isalnum() with different locales (OS-specific).
#include <iostream>
#include <locale>
int main()
{
const wchar_t c = L'\u2135'; // mathematical symbol aleph
std::locale loc1("C");
std::cout << "isalnum('ℵ', C locale) returned "
<< std::boolalpha << std::isalnum(c, loc1) << '\n';
std::locale loc2("en_US.UTF-8");
std::cout << "isalnum('ℵ', Unicode locale) returned "
<< std::boolalpha << std::isalnum(c, loc2) << '\n';
}Output:
isalnum('ℵ', C locale) returned false
isalnum('ℵ', Unicode locale) returned trueSee also
| checks if a character is alphanumeric (function) | |
| checks if a wide character is alphanumeric (function) |
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