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/*
* Copyright 2017 The Native Object Protocols Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LIBNOP_INCLUDE_NOP_BASE_MEMBERS_H_
#define LIBNOP_INCLUDE_NOP_BASE_MEMBERS_H_
#include <nop/base/encoding.h>
#include <nop/base/logical_buffer.h>
#include <nop/base/utility.h>
#include <nop/types/detail/member_pointer.h>
namespace nop {
//
// struct/class T encoding format:
//
// +-----+---------+-----//----+
// | STC | INT64:N | N MEMBERS |
// +-----+---------+-----//----+
//
// Members must be valid encodings of their member type.
//
template <typename T>
struct Encoding<T, EnableIfHasMemberList<T>> : EncodingIO<T> {
static constexpr EncodingByte Prefix(const T& /*value*/) {
return EncodingByte::Structure;
}
static constexpr std::size_t Size(const T& value) {
return BaseEncodingSize(Prefix(value)) + Encoding<SizeType>::Size(Count) +
Size(value, Index<Count>{});
}
static constexpr bool Match(EncodingByte prefix) {
return prefix == EncodingByte::Structure;
}
template <typename Writer>
static constexpr Status<void> WritePayload(EncodingByte /*prefix*/,
const T& value, Writer* writer) {
auto status = Encoding<SizeType>::Write(Count, writer);
if (!status)
return status;
else
return WriteMembers(value, writer, Index<Count>{});
}
template <typename Reader>
static constexpr Status<void> ReadPayload(EncodingByte /*prefix*/, T* value,
Reader* reader) {
SizeType size = 0;
auto status = Encoding<SizeType>::Read(&size, reader);
if (!status)
return status;
else if (size != Count)
return ErrorStatus::InvalidMemberCount;
else
return ReadMembers(value, reader, Index<Count>{});
}
private:
enum : std::size_t { Count = MemberListTraits<T>::MemberList::Count };
using MemberList = typename MemberListTraits<T>::MemberList;
template <std::size_t Index>
using PointerAt = typename MemberList::template At<Index>;
static constexpr std::size_t Size(const T& /*value*/, Index<0>) { return 0; }
template <std::size_t index>
static constexpr std::size_t Size(const T& value, Index<index>) {
return Size(value, Index<index - 1>{}) + PointerAt<index - 1>::Size(value);
}
template <typename Writer>
static constexpr Status<void> WriteMembers(const T& /*value*/,
Writer* /*writer*/, Index<0>) {
return {};
}
template <std::size_t index, typename Writer>
static constexpr Status<void> WriteMembers(const T& value, Writer* writer,
Index<index>) {
auto status = WriteMembers(value, writer, Index<index - 1>{});
if (!status)
return status;
else
return PointerAt<index - 1>::Write(value, writer, MemberList{});
}
template <typename Reader>
static constexpr Status<void> ReadMembers(T* /*value*/, Reader* /*reader*/,
Index<0>) {
return {};
}
template <std::size_t index, typename Reader>
static constexpr Status<void> ReadMembers(T* value, Reader* reader,
Index<index>) {
auto status = ReadMembers(value, reader, Index<index - 1>{});
if (!status)
return status;
else
return PointerAt<index - 1>::Read(value, reader, MemberList{});
}
};
} // namespace nop
#endif // LIBNOP_INCLUDE_NOP_BASE_MEMBERS_H_
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