| /* |
| * Copyright (C) 2020 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 INCLUDE_PERFETTO_PROTOZERO_ROOT_MESSAGE_H_ |
| #define INCLUDE_PERFETTO_PROTOZERO_ROOT_MESSAGE_H_ |
| |
| #include "perfetto/protozero/message.h" |
| #include "perfetto/protozero/message_arena.h" |
| |
| namespace protozero { |
| |
| // Helper class to hand out messages using the default MessageArena. |
| // Usage: |
| // RootMessage<perfetto::protos::zero::MyMessage> msg; |
| // msg.Reset(stream_writer); |
| // msg.set_foo(...); |
| // auto* nested = msg.set_nested(); |
| template <typename T = Message> |
| class RootMessage : public T { |
| public: |
| RootMessage() { T::Reset(nullptr, &root_arena_); } |
| |
| // Disallow copy and move. |
| RootMessage(const RootMessage&) = delete; |
| RootMessage& operator=(const RootMessage&) = delete; |
| RootMessage(RootMessage&&) = delete; |
| RootMessage& operator=(RootMessage&&) = delete; |
| |
| void Reset(ScatteredStreamWriter* writer) { |
| root_arena_.Reset(); |
| Message::Reset(writer, &root_arena_); |
| } |
| |
| private: |
| MessageArena root_arena_; |
| }; |
| |
| } // namespace protozero |
| |
| #endif // INCLUDE_PERFETTO_PROTOZERO_ROOT_MESSAGE_H_ |