chromium/third_party/grpc/src/include/grpcpp/support/time.h

//
//
// Copyright 2015 gRPC authors.
//
// 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 GRPCPP_SUPPORT_TIME_H
#define GRPCPP_SUPPORT_TIME_H

#include <chrono>

#include <grpc/impl/grpc_types.h>
#include <grpcpp/support/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 this comment as your compiler will have
/// fired an error below. In order to fix this 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 this.
///
template <typename T>
class TimePoint { … };

template <>
class TimePoint<gpr_timespec> { … };

}  // namespace grpc

namespace grpc {

// from and to should be absolute time.
void Timepoint2Timespec(const std::chrono::system_clock::time_point& from,
                        gpr_timespec* to);
void TimepointHR2Timespec(
    const std::chrono::high_resolution_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> { … };

}  // namespace grpc

#endif  // GRPCPP_SUPPORT_TIME_H