text: /*
  Copyright 2020 The OneFlow 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 ONEFLOW_CORE_COMMON_DEVICE_TYPE_H_
  #define ONEFLOW_CORE_COMMON_DEVICE_TYPE_H_
  
  #include "oneflow/core/common/device_type.pb.h"
  
  namespace std {
  
  template<>
  struct hash<oneflow::DeviceType> final {
    size_t operator()(oneflow::DeviceType device_type) const {
      return static_cast<size_t>(device_type);
    }
  };
  
  }  // namespace std
  
  namespace oneflow {
  
  inline std::string PrintAvailableDevices() {
    std::string str("[");
    str += "\"cpu\"";
  #ifdef WITH_CUDA
    str += ", \"cuda\"";
  #endif
    str += ", \"auto\"";  // "auto" is a fake device type for random generator.
    str += "]";
    return str;
  }
  
  #if defined(WITH_CUDA)
  #define DEVICE_TYPE_SEQ                  \
    OF_PP_MAKE_TUPLE_SEQ(DeviceType::kCPU) \
    OF_PP_MAKE_TUPLE_SEQ(DeviceType::kCUDA)
  #else
  #define DEVICE_TYPE_SEQ OF_PP_MAKE_TUPLE_SEQ(DeviceType::kCPU)
  #endif
  
  }  // namespace oneflow
  
  #endif  // ONEFLOW_CORE_COMMON_DEVICE_TYPE_H_
  