Method operator==

test/issues/github_460.cpp:15–17

    BOOST_HANA_DEFINE_STRUCT(SomeStruct, (int, x));

    constexpr bool operator==(SomeStruct const& other) const {
        return hana::equal(hana::members(*this), hana::members(other));
    }

    constexpr bool operator!=(SomeStruct const& other) const {
        return hana::not_equal(hana::members(*this), hana::members(other));