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// Copyright (C) 2017 The Android Open Source Project
//
// 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 SERIALIZE_ARENA_PTR_H_
#define SERIALIZE_ARENA_PTR_H_
#include <google/protobuf/arena.h>
#include <memory>
namespace iorap {
namespace serialize {
/**
* @file
*
* Helpers for protobuf arena allocators. We use smart pointers
* with an arena embedded inside of them to avoid caring about the
* arena in other parts of libiorap.
*/
// Arena-managed objects must not be deleted manually.
// When the Arena goes out of scope, it cleans everything up itself.
template <typename T>
void DoNotDelete(T*) {}
template <typename T, typename Base = std::unique_ptr<T, decltype(&DoNotDelete<T>)>>
struct ArenaPtr : public Base {
template <typename... Args>
static ArenaPtr<T> Make(Args&& ... args) {
ArenaPtr<T> arena_ptr(nullptr);
arena_ptr.reset(google::protobuf::Arena::Create<T>(arena_ptr.arena_.get(),
std::forward<Args>(args)...));
return arena_ptr;
}
ArenaPtr(std::nullptr_t) : Base(nullptr, &DoNotDelete<T>) {} // NOLINT explicit.
private:
// Use a unique_ptr because Arena doesn't support move semantics.
std::unique_ptr<google::protobuf::Arena> arena_{new google::protobuf::Arena{}};
};
template <typename T, typename Base = std::shared_ptr<T>>
struct ArenaSharedPtr : public Base {
template <typename... Args>
static ArenaSharedPtr<T> Make(Args&& ... args) {
ArenaSharedPtr<T> arena_ptr(nullptr, &DoNotDelete<T>);
arena_ptr.reset(google::protobuf::Arena::Create<T>(arena_ptr.arena_.get(),
std::forward<Args>(args)...));
return arena_ptr;
}
ArenaSharedPtr() = default;
template <typename Deleter>
ArenaSharedPtr(std::nullptr_t, Deleter d) : Base(nullptr, d) {} // NOLINT explicit.
private:
std::shared_ptr<google::protobuf::Arena> arena_{new google::protobuf::Arena{}};
};
} // namespace serialize
} // namespace iorap
#endif
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