diff options
Diffstat (limited to 'third_party/abseil-cpp/absl/time/internal/cctz/include/cctz/time_zone.h')
| -rw-r--r-- | third_party/abseil-cpp/absl/time/internal/cctz/include/cctz/time_zone.h | 119 |
1 files changed, 97 insertions, 22 deletions
diff --git a/third_party/abseil-cpp/absl/time/internal/cctz/include/cctz/time_zone.h b/third_party/abseil-cpp/absl/time/internal/cctz/include/cctz/time_zone.h index d05147a17c..6e382dc6c9 100644 --- a/third_party/abseil-cpp/absl/time/internal/cctz/include/cctz/time_zone.h +++ b/third_party/abseil-cpp/absl/time/internal/cctz/include/cctz/time_zone.h @@ -22,6 +22,7 @@ #include <chrono> #include <cstdint> +#include <limits> #include <string> #include <utility> @@ -41,20 +42,9 @@ using sys_seconds = seconds; // Deprecated. Use cctz::seconds instead. namespace detail { template <typename D> -inline std::pair<time_point<seconds>, D> split_seconds( - const time_point<D>& tp) { - auto sec = std::chrono::time_point_cast<seconds>(tp); - auto sub = tp - sec; - if (sub.count() < 0) { - sec -= seconds(1); - sub += seconds(1); - } - return {sec, std::chrono::duration_cast<D>(sub)}; -} -inline std::pair<time_point<seconds>, seconds> split_seconds( - const time_point<seconds>& tp) { - return {tp, seconds::zero()}; -} +std::pair<time_point<seconds>, D> split_seconds(const time_point<D>& tp); +std::pair<time_point<seconds>, seconds> split_seconds( + const time_point<seconds>& tp); } // namespace detail // cctz::time_zone is an opaque, small, value-type class representing a @@ -209,7 +199,7 @@ class time_zone { // version() and description() provide additional information about the // time zone. The content of each of the returned strings is unspecified, // however, when the IANA Time Zone Database is the underlying data source - // the version() std::string will be in the familar form (e.g, "2018e") or + // the version() string will be in the familar form (e.g, "2018e") or // empty when unavailable. // // Note: These functions are for informational or testing purposes only. @@ -279,6 +269,20 @@ std::string format(const std::string&, const time_point<seconds>&, const femtoseconds&, const time_zone&); bool parse(const std::string&, const std::string&, const time_zone&, time_point<seconds>*, femtoseconds*, std::string* err = nullptr); +template <typename Rep, std::intmax_t Denom> +bool join_seconds( + const time_point<seconds>& sec, const femtoseconds& fs, + time_point<std::chrono::duration<Rep, std::ratio<1, Denom>>>* tpp); +template <typename Rep, std::intmax_t Num> +bool join_seconds( + const time_point<seconds>& sec, const femtoseconds& fs, + time_point<std::chrono::duration<Rep, std::ratio<Num, 1>>>* tpp); +template <typename Rep> +bool join_seconds( + const time_point<seconds>& sec, const femtoseconds& fs, + time_point<std::chrono::duration<Rep, std::ratio<1, 1>>>* tpp); +bool join_seconds(const time_point<seconds>& sec, const femtoseconds&, + time_point<seconds>* tpp); } // namespace detail // Formats the given time_point in the given cctz::time_zone according to @@ -292,6 +296,7 @@ bool parse(const std::string&, const std::string&, const time_zone&, // - %E#f - Fractional seconds with # digits of precision // - %E*f - Fractional seconds with full precision (a literal '*') // - %E4Y - Four-character years (-999 ... -001, 0000, 0001 ... 9999) +// - %ET - The RFC3339 "date-time" separator "T" // // Note that %E0S behaves like %S, and %E0f produces no characters. In // contrast %E*f always produces at least one digit, which may be '0'. @@ -321,7 +326,8 @@ inline std::string format(const std::string& fmt, const time_point<D>& tp, // returns the corresponding time_point. Uses strftime()-like formatting // options, with the same extensions as cctz::format(), but with the // exceptions that %E#S is interpreted as %E*S, and %E#f as %E*f. %Ez -// and %E*z also accept the same inputs. +// and %E*z also accept the same inputs, which (along with %z) includes +// 'z' and 'Z' as synonyms for +00:00. %ET accepts either 'T' or 't'. // // %Y consumes as many numeric characters as it can, so the matching data // should always be terminated with a non-numeric. %E4Y always consumes @@ -367,15 +373,84 @@ inline bool parse(const std::string& fmt, const std::string& input, const time_zone& tz, time_point<D>* tpp) { time_point<seconds> sec; detail::femtoseconds fs; - const bool b = detail::parse(fmt, input, tz, &sec, &fs); - if (b) { - // TODO: Return false if unrepresentable as a time_point<D>. - *tpp = std::chrono::time_point_cast<D>(sec); - *tpp += std::chrono::duration_cast<D>(fs); + return detail::parse(fmt, input, tz, &sec, &fs) && + detail::join_seconds(sec, fs, tpp); +} + +namespace detail { + +// Split a time_point<D> into a time_point<seconds> and a D subseconds. +// Undefined behavior if time_point<seconds> is not of sufficient range. +// Note that this means it is UB to call cctz::time_zone::lookup(tp) or +// cctz::format(fmt, tp, tz) with a time_point that is outside the range +// of a 64-bit std::time_t. +template <typename D> +std::pair<time_point<seconds>, D> split_seconds(const time_point<D>& tp) { + auto sec = std::chrono::time_point_cast<seconds>(tp); + auto sub = tp - sec; + if (sub.count() < 0) { + sec -= seconds(1); + sub += seconds(1); } - return b; + return {sec, std::chrono::duration_cast<D>(sub)}; +} + +inline std::pair<time_point<seconds>, seconds> split_seconds( + const time_point<seconds>& tp) { + return {tp, seconds::zero()}; } +// Join a time_point<seconds> and femto subseconds into a time_point<D>. +// Floors to the resolution of time_point<D>. Returns false if time_point<D> +// is not of sufficient range. +template <typename Rep, std::intmax_t Denom> +bool join_seconds( + const time_point<seconds>& sec, const femtoseconds& fs, + time_point<std::chrono::duration<Rep, std::ratio<1, Denom>>>* tpp) { + using D = std::chrono::duration<Rep, std::ratio<1, Denom>>; + // TODO(#199): Return false if result unrepresentable as a time_point<D>. + *tpp = std::chrono::time_point_cast<D>(sec); + *tpp += std::chrono::duration_cast<D>(fs); + return true; +} + +template <typename Rep, std::intmax_t Num> +bool join_seconds( + const time_point<seconds>& sec, const femtoseconds&, + time_point<std::chrono::duration<Rep, std::ratio<Num, 1>>>* tpp) { + using D = std::chrono::duration<Rep, std::ratio<Num, 1>>; + auto count = sec.time_since_epoch().count(); + if (count >= 0 || count % Num == 0) { + count /= Num; + } else { + count /= Num; + count -= 1; + } + if (count > (std::numeric_limits<Rep>::max)()) return false; + if (count < (std::numeric_limits<Rep>::min)()) return false; + *tpp = time_point<D>() + D{static_cast<Rep>(count)}; + return true; +} + +template <typename Rep> +bool join_seconds( + const time_point<seconds>& sec, const femtoseconds&, + time_point<std::chrono::duration<Rep, std::ratio<1, 1>>>* tpp) { + using D = std::chrono::duration<Rep, std::ratio<1, 1>>; + auto count = sec.time_since_epoch().count(); + if (count > (std::numeric_limits<Rep>::max)()) return false; + if (count < (std::numeric_limits<Rep>::min)()) return false; + *tpp = time_point<D>() + D{static_cast<Rep>(count)}; + return true; +} + +inline bool join_seconds(const time_point<seconds>& sec, const femtoseconds&, + time_point<seconds>* tpp) { + *tpp = sec; + return true; +} + +} // namespace detail } // namespace cctz } // namespace time_internal ABSL_NAMESPACE_END |