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//
// MessagePack for C++ static resolution routine
//
// Copyright (C) 2023 Uy Ha
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef MSGPACK_V1_TYPE_VARIANT_HPP
#define MSGPACK_V1_TYPE_VARIANT_HPP
#if defined(MSGPACK_USE_STD_VARIANT_ADAPTOR)
#include "msgpack/cpp_version.hpp"
#if MSGPACK_CPP_VERSION >= 201703
#include "msgpack/adaptor/adaptor_base.hpp"
#include "msgpack/object.hpp"
#include "msgpack/versioning.hpp"
#include <variant>
namespace msgpack {
MSGPACK_API_VERSION_NAMESPACE(v1) {
namespace adaptor {
namespace detail {
template <
typename Variant,
typename T,
typename... Ts,
std::size_t current_index,
std::size_t... indices
>
Variant construct_variant(
std::size_t index,
msgpack::object& object,
std::index_sequence<current_index, indices...>
) {
if constexpr(sizeof...(Ts) == 0) {
return Variant{std::in_place_index<current_index>, object.as<T>()};
}
else {
if (index == current_index) {
return Variant{std::in_place_index<current_index>, object.as<T>()};
}
return construct_variant<Variant, Ts...>(
index,
object,
std::index_sequence<indices...>()
);
}
}
struct object_variant_overload {
object_variant_overload(msgpack::object& obj, msgpack::zone& zone)
: obj{obj}
, zone{zone} {}
template<typename T>
void operator()(T const& value) {
obj = msgpack::object(value, zone);
}
msgpack::object& obj;
msgpack::zone& zone;
};
} // namespace detail
template <typename... Ts>
struct as<std::variant<Ts...>, typename std::enable_if<(msgpack::has_as<Ts>::value && ...)>::type> {
std::variant<Ts...> operator()(msgpack::object const& o) const {
if ( o.type != msgpack::type::ARRAY
|| o.via.array.size != 2
|| o.via.array.ptr[0].type != msgpack::type::POSITIVE_INTEGER
|| o.via.array.ptr[0].via.u64 >= sizeof...(Ts)) {
throw msgpack::type_error{};
}
return detail::construct_variant<std::variant<Ts...>, Ts...>(
o.via.array.ptr[0].as<std::size_t>(),
o.via.array.ptr[1],
std::make_index_sequence<sizeof...(Ts)>()
);
}
};
template<typename... Ts>
struct convert<std::variant<Ts...>> {
msgpack::object const& operator()(msgpack::object const& o, std::variant<Ts...>& v) const {
if ( o.type != msgpack::type::ARRAY
|| o.via.array.size != 2
|| o.via.array.ptr[0].type != msgpack::type::POSITIVE_INTEGER
|| o.via.array.ptr[0].via.u64 >= sizeof...(Ts)) {
throw msgpack::type_error{};
}
v = detail::construct_variant<std::variant<Ts...>, Ts...>(
o.via.array.ptr[0].as<std::size_t>(),
o.via.array.ptr[1],
std::make_index_sequence<sizeof...(Ts)>()
);
return o;
}
};
template <typename... Ts>
struct pack<std::variant<Ts...>>{
template<typename Stream>
msgpack::packer<Stream>& operator()(
msgpack::packer<Stream>& o,
std::variant<Ts...> const& v
) const {
o.pack_array(2);
o.pack_uint64(v.index());
std::visit([&o](auto const& value){o.pack(value);}, v);
return o;
}
};
template<typename... Ts>
struct object_with_zone<std::variant<Ts...>> {
void operator()(
msgpack::object::with_zone& o,
std::variant<Ts...> const& v
) const {
msgpack::object *p =
static_cast<msgpack::object *>(
o.zone.allocate_align(
sizeof(msgpack::object) * 2,
MSGPACK_ZONE_ALIGNOF(msgpack::object)
)
);
o.type = msgpack::type::ARRAY;
o.via.array.size = 2;
o.via.array.ptr = p;
o.via.array.ptr[0]= msgpack::object(v.index(), o.zone);
std::visit(detail::object_variant_overload(o.via.array.ptr[1], o.zone), v);
}
};
} // namespace adaptor
}
} // namespace msgpack
#endif // MSGPACK_CPP_VERSION >= 201703
#endif // defined(MSGPACK_USE_STD_VARIANT_ADAPTOR)
#endif // MSGPACK_V1_TYPE_VARIANT_HPP
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