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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_MAP_H_
#define LIBNOP_INCLUDE_NOP_BASE_MAP_H_
#include <map>
#include <numeric>
#include <unordered_map>
#include <nop/base/encoding.h>
namespace nop {
//
// std::map<Key, T> and std::unordered_map<Key, T> encoding format:
//
// +-----+---------+--------//---------+
// | MAP | INT64:N | N KEY/VALUE PAIRS |
// +-----+---------+--------//---------+
//
// Each pair must be a valid encoding of Key followed by a valid encoding of T.
//
template <typename Key, typename T, typename Compare, typename Allocator>
struct Encoding<std::map<Key, T, Compare, Allocator>>
: EncodingIO<std::map<Key, T, Compare, Allocator>> {
using Type = std::map<Key, T, Compare, Allocator>;
static constexpr EncodingByte Prefix(const Type& /*value*/) {
return EncodingByte::Map;
}
static constexpr std::size_t Size(const Type& value) {
return BaseEncodingSize(Prefix(value)) +
Encoding<SizeType>::Size(value.size()) +
std::accumulate(
value.cbegin(), value.cend(), 0U,
[](const std::size_t& sum, const std::pair<Key, T>& element) {
return sum + Encoding<Key>::Size(element.first) +
Encoding<T>::Size(element.second);
});
}
static constexpr bool Match(EncodingByte prefix) {
return prefix == EncodingByte::Map;
}
template <typename Writer>
static constexpr Status<void> WritePayload(EncodingByte /*prefix*/,
const Type& value,
Writer* writer) {
auto status = Encoding<SizeType>::Write(value.size(), writer);
if (!status)
return status;
for (const auto& element : value) {
status = Encoding<Key>::Write(element.first, writer);
if (!status)
return status;
status = Encoding<T>::Write(element.second, writer);
if (!status)
return status;
}
return {};
}
template <typename Reader>
static constexpr Status<void> ReadPayload(EncodingByte /*prefix*/,
Type* value, Reader* reader) {
SizeType size = 0;
auto status = Encoding<SizeType>::Read(&size, reader);
if (!status)
return status;
value->clear();
for (SizeType i = 0; i < size; i++) {
std::pair<Key, T> element;
status = Encoding<Key>::Read(&element.first, reader);
if (!status)
return status;
status = Encoding<T>::Read(&element.second, reader);
if (!status)
return status;
value->emplace(std::move(element));
}
return {};
}
};
template <typename Key, typename T, typename Hash, typename KeyEqual,
typename Allocator>
struct Encoding<std::unordered_map<Key, T, Hash, KeyEqual, Allocator>>
: EncodingIO<std::unordered_map<Key, T, Hash, KeyEqual, Allocator>> {
using Type = std::unordered_map<Key, T, Hash, KeyEqual, Allocator>;
static constexpr EncodingByte Prefix(const Type& /*value*/) {
return EncodingByte::Map;
}
static constexpr std::size_t Size(const Type& value) {
return BaseEncodingSize(Prefix(value)) +
Encoding<SizeType>::Size(value.size()) +
std::accumulate(
value.cbegin(), value.cend(), 0U,
[](const std::size_t& sum, const std::pair<Key, T>& element) {
return sum + Encoding<Key>::Size(element.first) +
Encoding<T>::Size(element.second);
});
}
static constexpr bool Match(EncodingByte prefix) {
return prefix == EncodingByte::Map;
}
template <typename Writer>
static constexpr Status<void> WritePayload(EncodingByte /*prefix*/,
const Type& value,
Writer* writer) {
auto status = Encoding<SizeType>::Write(value.size(), writer);
if (!status)
return status;
for (const auto& element : value) {
status = Encoding<Key>::Write(element.first, writer);
if (!status)
return status;
status = Encoding<T>::Write(element.second, writer);
if (!status)
return status;
}
return {};
}
template <typename Reader>
static constexpr Status<void> ReadPayload(EncodingByte /*prefix*/,
Type* value, Reader* reader) {
SizeType size = 0;
auto status = Encoding<SizeType>::Read(&size, reader);
if (!status)
return status;
value->clear();
for (SizeType i = 0; i < size; i++) {
std::pair<Key, T> element;
status = Encoding<Key>::Read(&element.first, reader);
if (!status)
return status;
status = Encoding<T>::Read(&element.second, reader);
if (!status)
return status;
value->emplace(std::move(element));
}
return {};
}
};
} // namespace nop
#endif // LIBNOP_INCLUDE_NOP_BASE_MAP_H_
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