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

💖 std::isalpha(std::locale)(3) 💖

okay so bestie, welcome to the C++ Standard Libary manual — this page is all about std::isalpha(std::locale)(3), and it's lowkey the moment locale-aware alphabet checks become main character energy. ✨

🌸 NAME 🌸

std::isalpha(std::locale) — literally the name, and it's an icon. 👑

✨ 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. No cap, that's the whole vibe check. 🦋

🎀 Parameters 🎀

• ch — character
• loc — locale

💅 Return value 💅

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

🧚 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, bestie — iykyk). 🫶

// 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)

fr fr, that's the whole page bestie — std::isalpha(std::locale)(3) — source/version: http://cppreference.com, date: 2024.06.10. Mwah 💋🫶