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add c_encoding and iso_encoding weekday functions (#380)

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- c_encoding satisfies ctime wday encoding: days since Sunday, range
  [0,6]
- iso_encoding satisfies ISO 8601 weekday:
  a digit d from 1 through 7, beginning with Monday and ending with Sunday
This commit is contained in:
NeroBurner
2019-01-19 20:46:21 +01:00
committed by Howard Hinnant
parent 90d0440884
commit 4e7e76b981
1 changed files with 17 additions and 0 deletions
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17
include/date/date.h
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@@ -429,6 +429,9 @@ public:
CONSTCD11 bool ok() const NOEXCEPT;
CONSTCD11 unsigned c_encoding() const NOEXCEPT;
CONSTCD11 unsigned iso_encoding() const NOEXCEPT;
CONSTCD11 weekday_indexed operator[](unsigned index) const NOEXCEPT;
CONSTCD11 weekday_last operator[](last_spec) const NOEXCEPT;
@@ -1763,6 +1766,20 @@ weekday::operator-=(const days& d) NOEXCEPT
CONSTCD11 inline bool weekday::ok() const NOEXCEPT {return wd_ <= 6;}
CONSTCD11
inline
unsigned weekday::c_encoding() const NOEXCEPT
{
return unsigned{wd_};
}
CONSTCD11
inline
unsigned weekday::iso_encoding() const NOEXCEPT
{
return unsigned{((wd_ == 0u) ? 7u : wd_)};
}
CONSTCD11
inline
bool