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';
}

Output:

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

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

std::isalpha(std::locale)

Parameters

Return value

Possible implementation

Example

See also