##### cppreference.com

##### Search

Create account

##### Namespaces

- Page
- Discussion

##### Variants

##### Views

- View
- Edit
- History

##### Actions

# std::isalpha(std::locale)

From cppreference.com
< cpp‎ | locale

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

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

### [edit] 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);
    }

### [edit] 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';
    }

Output:

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

### [edit] See also

isalpha | checks if a character is alphabetic (function) [edit]
iswalpha | checks if a wide character is alphabetic (function) [edit]

Retrieved from "http://en.cppreference.com/mwiki/index.php?title=cpp/locale/isalpha&oldid=58119"