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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* 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.
*/
#pragma once
#include <chrono>
namespace std {
namespace chrono {
namespace detail {
template <typename From, typename To>
struct posix_duration_cast;
// chrono -> timespec caster
template <typename Rep, typename Period>
struct posix_duration_cast<std::chrono::duration<Rep, Period>,
struct timespec> {
static struct timespec cast(std::chrono::duration<Rep, Period> const &d) {
struct timespec tv;
std::chrono::seconds const sec =
std::chrono::duration_cast<std::chrono::seconds>(d);
tv.tv_sec = sec.count();
tv.tv_nsec =
std::chrono::duration_cast<std::chrono::nanoseconds>(d - sec).count();
return tv;
}
};
// timespec -> chrono caster
template <typename Rep, typename Period>
struct posix_duration_cast<struct timespec,
std::chrono::duration<Rep, Period>> {
static std::chrono::duration<Rep, Period> cast(struct timespec const &tv) {
return std::chrono::duration_cast<std::chrono::duration<Rep, Period>>(
std::chrono::seconds(tv.tv_sec) + std::chrono::nanoseconds(tv.tv_nsec));
}
};
} // namespace detail
// chrono -> timespec
template <typename T, typename Rep, typename Period>
auto duration_cast(std::chrono::duration<Rep, Period> const &d) ->
typename std::enable_if<std::is_same<T, struct timespec>::value,
struct timespec>::type {
return detail::posix_duration_cast<std::chrono::duration<Rep, Period>,
timespec>::cast(d);
}
// timespec -> chrono
template <typename Duration>
Duration duration_cast(struct timespec const &tv) {
return detail::posix_duration_cast<struct timespec, Duration>::cast(tv);
}
} // namespace chrono
} // namespace std
namespace utils {
template <typename T>
class Time {
public:
using Clock = T;
using TimePoint = typename Clock::time_point;
using Rep = uint64_t;
using Seconds = std::chrono::duration<Rep>;
using Milliseconds = std::chrono::duration<Rep, std::milli>;
using Microseconds = std::chrono::duration<Rep, std::micro>;
static auto now() { return Clock::now(); }
// From epochs
static auto nowMs() {
return std::chrono::duration_cast<Milliseconds>(now().time_since_epoch());
}
// From epoch
static auto nowUs() {
return std::chrono::duration_cast<Microseconds>(now().time_since_epoch());
}
template <typename D>
static auto getDuration(const TimePoint &start, const TimePoint &end) {
return std::chrono::duration_cast<D>(end - start);
}
static auto getDurationS(const TimePoint &start, const TimePoint &end) {
return getDuration<Seconds>(start, end);
}
static auto getDurationMs(const TimePoint &start, const TimePoint &end) {
return getDuration<Milliseconds>(start, end);
}
static auto getDurationUs(const TimePoint &start, const TimePoint &end) {
return getDuration<Microseconds>(start, end);
}
};
using SteadyTime = Time<std::chrono::steady_clock>;
using SystemTime = Time<std::chrono::system_clock>;
} // namespace utils
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