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)