25 struct pod {};  struct
28 void to_json(json& /*unused*/, pod /*unused*/) noexcept;
30 void from_json(const json& /*unused*/, pod /*unused*/) noexcept;
32 void to_json(json& /*unused*/, pod /*unused*/) noexcept {}  in to_json()  argument
34 void from_json(const json& /*unused*/, pod /*unused*/) noexcept {}  in from_json()  argument
44 static_assert(noexcept(nlohmann::to_json(*j, pod{})), "");
48 static_assert(noexcept(json(pod{})), "");
49 static_assert(noexcept(j->get<pod>()), "");
51 static_assert(noexcept(json(pod{})), "");
75         to_json(j2, pod());
77         from_json(j2, pod());