std::isalpha(std::locale)(3)

NAME
std::isalpha(std::locale) - std::isalpha(std::locale)

Synopsis
   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). // Run this code
 #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
   isalpha checks if a character is alphabetic
            (function)
   iswalpha checks if a wide character is alphabetic
            (function)