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serializer: add reference_wrapper handling

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Serialize reference_wrapper<T> as T and make sure is_equivalent<> treats
reference_wrapper<T> wrapped in std::optional<> or std::variant<>, or
std::tuple<> as T.

We need it to avoid copying query::result while serializing
paxos::promise.
This commit is contained in:
Vladimir Davydov
2019-11-20 13:41:55 +03:00
committed by Avi Kivity
parent 1452653fbc
commit f5c2a23118
1 changed files with 37 additions and 0 deletions
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37
serializer.hh
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@@ -232,6 +232,11 @@ inline void serialize(Output& out, const T& v) {
serializer<T>::write(out, v);
};
template<typename T, typename Output>
inline void serialize(Output& out, const std::reference_wrapper<T> v) {
serializer<T>::write(out, v.get());
}
template<typename T, typename Input>
inline auto deserialize(Input& in, boost::type<T> t) {
return serializer<T>::read(in);
@@ -304,6 +309,38 @@ template <typename T, typename U>
struct is_equivalent : std::is_same<typename normalize<std::remove_const_t<std::remove_reference_t<T>>>::type, typename normalize<std::remove_const_t <std::remove_reference_t<U>>>::type> {
};
template <typename T, typename U>
struct is_equivalent<std::reference_wrapper<T>, U> : is_equivalent<T, U> {
};
template <typename T, typename U>
struct is_equivalent<T, std::reference_wrapper<U>> : is_equivalent<T, U> {
};
template <typename T, typename U>
struct is_equivalent<std::optional<T>, std::optional<U>> : is_equivalent<T, U> {
};
template <typename T, typename U, bool>
struct is_equivalent_arity;
template <typename ...T, typename ...U>
struct is_equivalent_arity<std::tuple<T...>, std::tuple<U...>, false> : std::false_type {
};
template <typename ...T, typename ...U>
struct is_equivalent_arity<std::tuple<T...>, std::tuple<U...>, true> {
static constexpr bool value = (is_equivalent<T, U>::value && ...);
};
template <typename ...T, typename ...U>
struct is_equivalent<std::tuple<T...>, std::tuple<U...>> : is_equivalent_arity<std::tuple<T...>, std::tuple<U...>, sizeof...(T) == sizeof...(U)> {
};
template <typename ...T, typename ...U>
struct is_equivalent<std::variant<T...>, std::variant<U...>> : is_equivalent<std::tuple<T...>, std::tuple<U...>> {
};
// gc_clock duration values were serialized as 32-bit prior to 3.1, and
// are serialized as 64-bit in 3.1.0.
//