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Update DateLUTImpl.h

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alexey-milovidov 2021-03-03 22:49:20 +03:00 committed by GitHub
parent 80c17d5537
commit 2f23f1b123
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1 changed files with 6 additions and 4 deletions
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base/common/DateLUTImpl.h
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@ -136,18 +136,20 @@ public:
/// Since most of the modern timezones have a DST change aligned to 15 minutes, to save as much space as possible inside Value,
/// we are dividing any offset change related value by this factor before setting it to Value,
/// hence it has to be explicitly multiplied back by this factor before being used.
static const UInt16 OffsetChangeFactor = 900;
static constexpr UInt16 OffsetChangeFactor = 900;
};
static_assert(sizeof(Values) == 16);
private:
// Mask is all-ones to allow efficient protection against overflow.
static const UInt32 date_lut_mask = 0x1ffff;
/// Mask is all-ones to allow efficient protection against overflow.
static constexpr UInt32 date_lut_mask = 0x1ffff;
static_assert(date_lut_mask == DATE_LUT_SIZE - 1);
const UInt32 daynum_offset_epoch = 16436; // offset to epoch in days (ExtendedDayNum) of the first day in LUT.
/// Offset to epoch in days (ExtendedDayNum) of the first day in LUT.
static constexpr UInt32 daynum_offset_epoch = 16436;
static_assert(daynum_offset_epoch == (DATE_LUT_MIN_YEAR - 1970) * 365 + (1970 - DATE_LUT_MIN_YEAR / 4 * 4) / 4);
/// Lookup table is indexed by LUTIndex.
/// Day nums are the same in all time zones. 1970-01-01 is 0 and so on.