|  | /* | 
|  | *    Copyright (c) 2023 Project CHIP Authors | 
|  | *    All rights reserved. | 
|  | * | 
|  | *    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. | 
|  | */ | 
|  | #pragma once | 
|  |  | 
|  | namespace chip { | 
|  | namespace Tracing { | 
|  |  | 
|  | // These structures are forward-declared so that tracing itself has no direct dependencies | 
|  | // on actual types. This allows tracing to be used anywhere lib/support could be used. | 
|  |  | 
|  | struct MessageSendInfo; | 
|  | struct MessageReceivedInfo; | 
|  | struct NodeLookupInfo; | 
|  | struct NodeDiscoveredInfo; | 
|  | struct NodeDiscoveryFailedInfo; | 
|  | class MetricEvent; | 
|  |  | 
|  | } // namespace Tracing | 
|  | } // namespace chip |