serde: Require T::serde_fields for all serde structs

With the exception of those that implement BOTH a custom reader and a custom writer. In that case, the fields tuple is not needed, so envelope_to_tuple will not participate in overload resolution.
redpanda-data · Aug 21, 2024 · cc40bc4 · cc40bc4
1 parent 6a00995
commit cc40bc4
Showing 1 changed file with 0 additions and 171 deletions.
diff --git a/src/v/serde/envelope_for_each_field.h b/src/v/serde/envelope_for_each_field.h
@@ -29,177 +29,6 @@ constexpr inline auto envelope_to_tuple(T&& t) {
     return t.serde_fields();
 }
 
-template<typename T>
-requires(!detail::has_serde_fields<T>)
-constexpr inline auto envelope_to_tuple(T& t) {
-    static_assert(std::is_aggregate_v<T>);
-    static_assert(std::is_standard_layout_v<T>);
-    static_assert(!std::is_polymorphic_v<T>);
-
-    constexpr auto const a = reflection::arity<T>() - 1;
-    if constexpr (a == 0) {
-        return std::tie();
-    } else if constexpr (a == 1) {
-        auto& [p1] = t;
-        return std::tie(p1);
-    } else if constexpr (a == 2) {
-        auto& [p1, p2] = t;
-        return std::tie(p1, p2);
-    } else if constexpr (a == 3) {
-        auto& [p1, p2, p3] = t;
-        return std::tie(p1, p2, p3);
-    } else if constexpr (a == 4) {
-        auto& [p1, p2, p3, p4] = t;
-        return std::tie(p1, p2, p3, p4);
-    } else if constexpr (a == 5) {
-        auto& [p1, p2, p3, p4, p5] = t;
-        return std::tie(p1, p2, p3, p4, p5);
-    } else if constexpr (a == 6) {
-        auto& [p1, p2, p3, p4, p5, p6] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6);
-    } else if constexpr (a == 7) {
-        auto& [p1, p2, p3, p4, p5, p6, p7] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6, p7);
-    } else if constexpr (a == 8) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6, p7, p8);
-    } else if constexpr (a == 9) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6, p7, p8, p9);
-    } else if constexpr (a == 10) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10);
-    } else if constexpr (a == 11) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11);
-    } else if constexpr (a == 12) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12);
-    } else if constexpr (a == 13) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13] = t;
-        return std::tie(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13);
-    } else if constexpr (a == 14) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14] = t;
-        return std::tie(
-          p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14);
-    } else if constexpr (a == 15) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15]
-          = t;
-        return std::tie(
-          p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15);
-    } else if constexpr (a == 16) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, p16]
-          = t;
-        return std::tie(
-          p1,
-          p2,
-          p3,
-          p4,
-          p5,
-          p6,
-          p7,
-          p8,
-          p9,
-          p10,
-          p11,
-          p12,
-          p13,
-          p14,
-          p15,
-          p16);
-    } else if constexpr (a == 17) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, p16, p17]
-          = t;
-        return std::tie(
-          p1,
-          p2,
-          p3,
-          p4,
-          p5,
-          p6,
-          p7,
-          p8,
-          p9,
-          p10,
-          p11,
-          p12,
-          p13,
-          p14,
-          p15,
-          p16,
-          p17);
-    } else if constexpr (a == 18) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, p16, p17, p18]
-          = t;
-        return std::tie(
-          p1,
-          p2,
-          p3,
-          p4,
-          p5,
-          p6,
-          p7,
-          p8,
-          p9,
-          p10,
-          p11,
-          p12,
-          p13,
-          p14,
-          p15,
-          p16,
-          p17,
-          p18);
-    } else if constexpr (a == 19) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, p16, p17, p18, p19]
-          = t;
-        return std::tie(
-          p1,
-          p2,
-          p3,
-          p4,
-          p5,
-          p6,
-          p7,
-          p8,
-          p9,
-          p10,
-          p11,
-          p12,
-          p13,
-          p14,
-          p15,
-          p16,
-          p17,
-          p18,
-          p19);
-    } else if constexpr (a == 20) {
-        auto& [p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, p16, p17, p18, p19, p20]
-          = t;
-        return std::tie(
-          p1,
-          p2,
-          p3,
-          p4,
-          p5,
-          p6,
-          p7,
-          p8,
-          p9,
-          p10,
-          p11,
-          p12,
-          p13,
-          p14,
-          p15,
-          p16,
-          p17,
-          p18,
-          p19,
-          p20);
-    }
-}
-
 template<typename Fn>
 concept check_for_more_fn = requires(Fn&& fn, int& f) {
     { fn(f) } -> std::convertible_to<bool>;