text: //---------------------------------------------------------------------------//
  // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
  //
  // Distributed under the Boost Software License, Version 1.0
  // See accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt
  //
  // See http://boostorg.github.com/compute for more information.
  //---------------------------------------------------------------------------//
  
  #ifndef BOOST_COMPUTE_DETAIL_DURATION_HPP
  #define BOOST_COMPUTE_DETAIL_DURATION_HPP
  
  #include <boost/config.hpp>
  
  #ifndef BOOST_COMPUTE_NO_HDR_CHRONO
  #include <chrono>
  #endif
  
  #include <boost/chrono/duration.hpp>
  
  namespace boost {
  namespace compute {
  namespace detail {
  
  #ifndef BOOST_COMPUTE_NO_HDR_CHRONO
  template<class Rep, class Period>
  inline std::chrono::duration<Rep, Period>
  make_duration_from_nanoseconds(std::chrono::duration<Rep, Period>, size_t nanoseconds)
  {
      return std::chrono::duration_cast<std::chrono::duration<Rep, Period> >(
          std::chrono::nanoseconds(nanoseconds)
      );
  }
  #endif // BOOST_COMPUTE_NO_HDR_CHRONO
  
  template<class Rep, class Period>
  inline boost::chrono::duration<Rep, Period>
  make_duration_from_nanoseconds(boost::chrono::duration<Rep, Period>, size_t nanoseconds)
  {
      return boost::chrono::duration_cast<boost::chrono::duration<Rep, Period> >(
          boost::chrono::nanoseconds(nanoseconds)
      );
  }
  
  } // end detail namespace
  } // end compute namespace
  } // end boost namespace
  
  #endif // BOOST_COMPUTE_DETAIL_DURATION_HPP
  