Function all_qualifiers

test/invoke_test.cpp:73–90

template <typename T>
auto all_qualifiers(identity<T> f)
{
    auto a = cv_qualifiers(f);
    // make_index_sequence would work, but no need
    auto b = ref_qualifiers(std::get<0>(a));
    auto c = ref_qualifiers(std::get<1>(a));
    auto d = ref_qualifiers(std::get<2>(a));
    auto e = ref_qualifiers(std::get<3>(a));

    return std::make_tuple(std::get<0>(b),
        std::get<1>(b),
        std::get<0>(c),
        std::get<1>(c),
        std::get<0>(d),
        std::get<1>(d),
        std::get<0>(e),
        std::get<1>(e));
}

template <typename... Args>
struct all_invocable;