Function main

test/optional/representation.cpp:13–19

struct Foo { };

int main() {
    auto just = hana::just(Foo{});
    static_assert(std::is_same<decltype(just), hana::optional<Foo>>{}, "");

    auto nothing = hana::nothing;
    static_assert(std::is_same<decltype(nothing), hana::optional<>>{}, "");
}