The solution to today's Connections #1001 is...
You can see that the changes are only in E1, E2, and E3. The latter one is required just for completeness. The interesting change is in E2 where I no longer use a block local static but the static data member from E1. You still have the two options: user-declared and user-defined constructor.，这一点在新收录的资料中也有详细论述
assert shift0(3, Var(2)) == Var(2)，更多细节参见新收录的资料
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