palidrome.cc

palidrome.cc

bool is_palindrome(std::string_view str)
{
    auto letters_only{str
        | std::views::filter([](char c) { return std::isalnum(c, std::locale{}); })
        | std::views::transform([](char c) { return std::tolower(c, std::locale{}); })
    };
    auto reversed{letters_only | std::views::reverse};

    return std::ranges::equal(letters_only, reversed);
}