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 *
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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#ifndef GRPC_INTERNAL_CPP_UTIL_TIME_H
#define GRPC_INTERNAL_CPP_UTIL_TIME_H

#include <grpc++/config.h>

namespace grpc {

/* If you are trying to use CompletionQueue::AsyncNext with a time class that
   isn't either gpr_timespec or std::chrono::system_clock::time_point, you
   will most likely be looking at that comment as your compiler will have
   fired an error below. In order to fix that issue, you have two potential
   solutions:

     1. Use gpr_timespec or std::chrono::system_clock::time_point instead
     2. Specialize the TimePoint class with whichever time class that you
        want to use here. See below for two examples of how to do that.
 */

template <typename T>
class TimePoint {
 public:
  TimePoint(const T& time) {
    you_need_a_specialization_of_TimePoint();
  }
  gpr_timespec raw_time() {
    gpr_timespec t;
    return t;
  }
 private:
  void you_need_a_specialization_of_TimePoint();
};

template<>
class TimePoint<gpr_timespec> {
 public:
  TimePoint(const gpr_timespec& time) : time_(time) { }
  gpr_timespec raw_time() { return time_; }
 private:
  gpr_timespec time_;
};

}  // namespace grpc

#ifndef GRPC_CXX0X_NO_CHRONO

#include <chrono>

#include <grpc/support/time.h>

namespace grpc {

// from and to should be absolute time.
void Timepoint2Timespec(const std::chrono::system_clock::time_point& from,
                        gpr_timespec* to);

std::chrono::system_clock::time_point Timespec2Timepoint(gpr_timespec t);

template <>
class TimePoint<std::chrono::system_clock::time_point> {
 public:
  TimePoint(const std::chrono::system_clock::time_point& time) {
	Timepoint2Timespec(time, &time_);
  }
  gpr_timespec raw_time() const { return time_; }
 private:
  gpr_timespec time_;
};

}  // namespace grpc

#endif  // !GRPC_CXX0X_NO_CHRONO

#endif  // GRPC_INTERNAL_CPP_UTIL_TIME_H