chrono.hpp

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#pragma once
 
#include <mbgl/platform/time.hpp>
 
#include <chrono>
#include <limits>
#include <string>
#include <type_traits>
 
namespace mbgl {
 
using Clock = std::chrono::steady_clock;
 
using Seconds = std::chrono::seconds;
using Milliseconds = std::chrono::milliseconds;
 
using TimePoint = Clock::time_point;
using Duration  = Clock::duration;
 
// Used to measure second-precision times, such as times gathered from HTTP responses.
using Timestamp = std::chrono::time_point<std::chrono::system_clock, Seconds>;
 
namespace util {
 
inline Timestamp now() {
    return platform::now();
}
 
// Returns the RFC1123 formatted date. E.g. "Tue, 04 Nov 2014 02:13:24 GMT"
std::string rfc1123(Timestamp);
 
// YYYY-mm-dd HH:MM:SS e.g. "2015-11-26 16:11:23"
std::string iso8601(Timestamp);
 
Timestamp parseTimestamp(const char *);
 
Timestamp parseTimestamp(int32_t timestamp);
 
// C++17 polyfill
#if defined(_MSC_VER) && !defined(__clang__)
template <class _Rep, class _Period, std::enable_if_t<std::numeric_limits<_Rep>::is_signed, int> = 0>
_NODISCARD constexpr std::chrono::duration<_Rep, _Period> abs(const std::chrono::duration<_Rep, _Period> _Dur) noexcept(
    std::is_arithmetic_v<_Rep>) /* strengthened */ {
    // create a duration with count() the absolute value of _Dur.count()
    return _Dur < std::chrono::duration<_Rep, _Period>::zero() ? std::chrono::duration<_Rep, _Period>::zero() - _Dur : _Dur;
}
#else
template <class Rep, class Period, class = std::enable_if_t<
   std::chrono::duration<Rep, Period>::min() < std::chrono::duration<Rep, Period>::zero()>>
constexpr std::chrono::duration<Rep, Period> abs(std::chrono::duration<Rep, Period> d)
{
    return d >= d.zero() ? d : -d;
}
#endif
 
} // namespace util
 
} // namespace mbgl