std::ranges::equal

Example

is_palindrome: (s: std::string_view) -> bool == {
    views: namespace == std::views;
    forward:=  s | views::take(s.size() / 2);
    backward:= s | views::reverse | views::take(s.size() / 2);
    return std::ranges::equal(forward, backward);
}

test: (s: std::string_view) = {
    text: std::string = "is";
    if !is_palindrome(s) {
        text += " not";
    }
    std::cout << std::quoted(s)
              << std::format(" {} a palindrome", text)
              << "\n";
}

main: () = {
    test("radar");
    test("hello");
    static_assert(is_palindrome("ABBA") && !is_palindrome("AC/DC"));
}

Output

"radar" is a palindrome
"hello" is not a palindrome