text: //
  // Copyright (c) 2016 Advanced Micro Devices, Inc. All rights reserved.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  
  #ifndef _SU_TIMESOURCE_H_
  #define _SU_TIMESOURCE_H_
  
  
  //=========================================================================================================
  /// \ingroup Common
  /// \brief Abstract interface for time sources.
  /// \sa SuObserver, SuTimer, SuClock
  //=========================================================================================================
  class SuTimeSource
  {
  public:
     //=========================================================================================================
     /// Destructor
     //=========================================================================================================      
     virtual SU_DLL ~SuTimeSource();
  
     //=========================================================================================================
     /// Called to get the current time from the time source.  Must be implemented by sub-classes.
     //=========================================================================================================      
     virtual SuTime GetTime() const = 0;
  };
  
  
  #endif // _SU_TIMESOURCE_H_
  