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

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

template< class CharT >
bool isalnum( CharT ch, const locale& loc );

Checks if the given character is classified as an alphanumeric 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 alphanumeric, false otherwise.

[edit] Possible implementation [edit] Example

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

Possible output:

isalnum('ℵ', C locale) returned false
isalnum('ℵ', Unicode locale) returned true
[edit] See also

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