text: /* Copyright 2021 The TensorFlow 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.
  ==============================================================================*/
  
  #ifndef TENSORFLOW_CORE_COMMON_RUNTIME_NO_OP_COST_MEASUREMENT_H_
  #define TENSORFLOW_CORE_COMMON_RUNTIME_NO_OP_COST_MEASUREMENT_H_
  
  #include "tensorflow/core/common_runtime/cost_measurement_registry.h"
  
  namespace tensorflow {
  
  // This class does not do the real cost measurement. It will always return zero
  // Duration as the total cost. It's created to allow callers to skip collecting
  // costs.
  class NoOpCostMeasurement : public CostMeasurement {
   public:
    // Always returns zero Duration as the total cost.
    absl::Duration GetTotalCost() override;
  };
  
  }  // namespace tensorflow
  
  #endif  // TENSORFLOW_CORE_COMMON_RUNTIME_NO_OP_COST_MEASUREMENT_H_
  