Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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79 lines
2.0 KiB
79 lines
2.0 KiB
3 months ago
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// Protocol Buffers - Google's data interchange format
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// Copyright 2024 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef GOOGLE_PROTOBUF_HPB_PTR_H__
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#define GOOGLE_PROTOBUF_HPB_PTR_H__
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#include <memory>
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#include <type_traits>
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class upb_Message;
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class upb_Arena;
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namespace hpb {
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template <typename T>
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using Proxy = std::conditional_t<std::is_const<T>::value,
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typename std::remove_const_t<T>::CProxy,
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typename T::Proxy>;
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// Provides convenient access to Proxy and CProxy message types.
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//
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// Using rebinding and handling of const, Ptr<Message> and Ptr<const Message>
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// allows copying const with T* const and avoids using non-copyable Proxy types
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// directly.
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template <typename T>
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class Ptr final {
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public:
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Ptr() = delete;
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// Implicit conversions
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Ptr(T* m) : p_(m) {} // NOLINT
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Ptr(const Proxy<T>* p) : p_(*p) {} // NOLINT
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Ptr(Proxy<T> p) : p_(p) {} // NOLINT
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Ptr(const Ptr& m) = default;
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Ptr& operator=(Ptr v) & {
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Proxy<T>::Rebind(p_, v.p_);
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return *this;
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}
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Proxy<T> operator*() const { return p_; }
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Proxy<T>* operator->() const {
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return const_cast<Proxy<T>*>(std::addressof(p_));
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}
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#ifdef __clang__
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wclass-conversion"
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#endif
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template <typename U = T, std::enable_if_t<!std::is_const<U>::value, int> = 0>
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operator Ptr<const T>() const {
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Proxy<const T> p(p_);
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return Ptr<const T>(&p);
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}
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#ifdef __clang__
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#pragma clang diagnostic pop
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#endif
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private:
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Ptr(upb_Message* msg, upb_Arena* arena) : p_(msg, arena) {} // NOLINT
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friend class Ptr<const T>;
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friend typename T::Access;
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Proxy<T> p_;
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};
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// Suppress -Wctad-maybe-unsupported with our manual deduction guide
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template <typename T>
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Ptr(T* m) -> Ptr<T>;
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} // namespace hpb
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#endif // GOOGLE_PROTOBUF_HPB_PTR_H__
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