text: // Copyright 2021 DeepMind Technologies Limited
  //
  // 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 OPEN_SPIEL_HIGC_UTILS_
  #define OPEN_SPIEL_HIGC_UTILS_
  
  #include <chrono>    // NOLINT
  #include <iostream>
  
  namespace open_spiel {
  namespace higc {
  
  void sleep_ms(int ms);
  int time_elapsed(
      const std::chrono::time_point<std::chrono::system_clock>& start);
  
  }  // namespace higc
  }  // namespace open_spiel
  
  #endif  // OPEN_SPIEL_HIGC_UTILS_
  