74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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enum class TransferDirection : uint64_t {
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READ = 0,
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WRITE = 1,
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};
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struct TransferId {
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TransferDirection direction : 1;
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uint64_t id : 63;
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constexpr TransferId() : TransferId(TransferDirection::READ, 0) {}
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TransferId(const TransferId& copy) = default;
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TransferId(TransferId&& move) = default;
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TransferId& operator=(const TransferId& copy) = default;
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TransferId& operator=(TransferId&& move) = default;
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private:
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constexpr TransferId(TransferDirection direction, uint64_t id) : direction(direction), id(id) {}
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public:
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bool operator==(const TransferId& rhs) const {
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return static_cast<uint64_t>(*this) == static_cast<uint64_t>(rhs);
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}
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constexpr explicit operator uint64_t() const {
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return static_cast<uint64_t>(direction) << 63 | id;
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}
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static constexpr TransferId read(uint64_t id) {
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return TransferId(TransferDirection::READ, id);
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}
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static constexpr TransferId write(uint64_t id) {
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return TransferId(TransferDirection::WRITE, id);
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}
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static constexpr TransferId from_value(uint64_t value) {
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uint64_t mask = static_cast<uint64_t>(1) << 63;
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TransferId result;
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result.direction = static_cast<TransferDirection>(!!(value & mask));
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result.id = value & (mask - 1);
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return result;
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}
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};
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namespace std {
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template <>
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struct hash<TransferId> {
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size_t operator()(TransferId id) const { return hash<uint64_t>()(static_cast<uint64_t>(id)); }
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};
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} // namespace std
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