86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/*
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* Copyright 2019 The Chromium Authors. All rights reserved.
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef NET_DCSCTP_PUBLIC_STRONG_ALIAS_H_
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#define NET_DCSCTP_PUBLIC_STRONG_ALIAS_H_
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#include <type_traits>
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#include <utility>
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namespace dcsctp {
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// This is a copy of
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// https://source.chromium.org/chromium/chromium/src/+/master:base/types/strong_alias.h
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// as the API (and internals) are using type-safe integral identifiers, but this
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// library can't depend on that file. The ostream operator has been removed
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// per WebRTC library conventions, and the underlying type is exposed.
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template <typename TagType, typename TheUnderlyingType>
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class StrongAlias {
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public:
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using UnderlyingType = TheUnderlyingType;
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constexpr StrongAlias() = default;
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constexpr explicit StrongAlias(const UnderlyingType& v) : value_(v) {}
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constexpr explicit StrongAlias(UnderlyingType&& v) noexcept
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: value_(std::move(v)) {}
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constexpr UnderlyingType* operator->() { return &value_; }
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constexpr const UnderlyingType* operator->() const { return &value_; }
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constexpr UnderlyingType& operator*() & { return value_; }
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constexpr const UnderlyingType& operator*() const& { return value_; }
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constexpr UnderlyingType&& operator*() && { return std::move(value_); }
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constexpr const UnderlyingType&& operator*() const&& {
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return std::move(value_);
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}
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constexpr UnderlyingType& value() & { return value_; }
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constexpr const UnderlyingType& value() const& { return value_; }
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constexpr UnderlyingType&& value() && { return std::move(value_); }
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constexpr const UnderlyingType&& value() const&& { return std::move(value_); }
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constexpr explicit operator const UnderlyingType&() const& { return value_; }
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constexpr bool operator==(const StrongAlias& other) const {
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return value_ == other.value_;
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}
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constexpr bool operator!=(const StrongAlias& other) const {
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return value_ != other.value_;
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}
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constexpr bool operator<(const StrongAlias& other) const {
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return value_ < other.value_;
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}
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constexpr bool operator<=(const StrongAlias& other) const {
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return value_ <= other.value_;
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}
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constexpr bool operator>(const StrongAlias& other) const {
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return value_ > other.value_;
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}
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constexpr bool operator>=(const StrongAlias& other) const {
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return value_ >= other.value_;
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}
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// Hasher to use in std::unordered_map, std::unordered_set, etc.
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struct Hasher {
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using argument_type = StrongAlias;
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using result_type = std::size_t;
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result_type operator()(const argument_type& id) const {
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return std::hash<UnderlyingType>()(id.value());
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}
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};
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protected:
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UnderlyingType value_;
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};
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} // namespace dcsctp
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#endif // NET_DCSCTP_PUBLIC_STRONG_ALIAS_H_
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