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