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libstdc++: Fix comment in chrono::year::is_leap()

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libstdc++-v3/ChangeLog:

	* include/std/chrono (chrono::year::is_leap()): Fix incorrect
	logic in comment.
This commit is contained in:
Jonathan Wakely 2021-06-23 18:50:03 +01:00
parent 8509a50010
commit 4a404f66b0
1 changed files with 2 additions and 2 deletions
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libstdc++-v3/include/std/chrono
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@ -1606,8 +1606,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// [1] https://github.com/cassioneri/calendar
// [2] https://accu.org/journals/overload/28/155/overload155.pdf#page=16
// Furthermore, if y%100 != 0, then y%400==0 is equivalent to y%16==0,
// so we can rearrange the expression to (mult_100 ? y % 4 : y % 16)==0
// Furthermore, if y%100 == 0, then y%400==0 is equivalent to y%16==0,
// so we can simplify it to (!mult_100 && y % 4 == 0) || y % 16 == 0,
// which is equivalent to (y & (mult_100 ? 15 : 3)) == 0.
// See https://gcc.gnu.org/pipermail/libstdc++/2021-June/052815.html