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[libc++] Avoid UB in year_month_day_last::day() for incorrect months 

This effectively implements the resolution of LWG3231, which mandates
that calling year_month_day_last::day() on an invalid year_month_day_last
is unspecified behavior. Before this change, it was undefined behavior.

Differential Revision: https://reviews.llvm.org/D81477
This commit is contained in:
Louis Dionne 2020-06-09 12:31:12 -04:00
parent 2c8afe1298
commit 1f48f8f6e2
1 changed files with 1 additions and 1 deletions
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2
libcxx/include/chrono
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@ -2454,7 +2454,7 @@ chrono::day year_month_day_last::day() const noexcept
chrono::day(31), chrono::day(31), chrono::day(30),
chrono::day(31), chrono::day(30), chrono::day(31)
};
return month() != February || !__y.is_leap() ?
return (month() != February || !__y.is_leap()) && month().ok() ?
__d[static_cast<unsigned>(month()) - 1] : chrono::day{29};
}