W3cubDocs

/C++

std::isalpha(std::locale)

Defined in header <locale>
template< class CharT >
bool isalpha( CharT ch, const locale& loc );

Checks if the given character is classified as an alphabetic character by the given locale's std::ctype facet.

Parameters

ch - character
loc - locale

Return value

Returns true if the character is classified as alphabetic, false otherwise.

Possible implementation

template< class CharT >
bool isalpha( CharT ch, const std::locale& loc ) {
    return std::use_facet<std::ctype<CharT>>(loc).is(std::ctype_base::alpha, ch);
}

Example

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

#include <iostream>
#include <locale>
 
int main()
{
    const wchar_t c = L'\u042f'; // cyrillic capital letter ya
 
    std::locale loc1("C");
    std::cout << "isalpha('Я', C locale) returned "
               << std::boolalpha << std::isalpha(c, loc1) << '\n';
 
    std::locale loc2("en_US.UTF8");
    std::cout << "isalpha('Я', Unicode locale) returned "
              << std::boolalpha << std::isalpha(c, loc2) << '\n';
}

Possible output:

isalpha('Я', C locale) returned false
isalpha('Я', Unicode locale) returned true

See also

checks if a character is alphabetic
(function)
checks if a wide character is alphabetic
(function)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/locale/isalpha