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bitset
, use its injected-class-name.<ranges>
, consistently grant access to the parentmeow_view
. This avoids needing forward declarations.join_view
is being updated by Implement P2770R0 "Stashing stashing iterators for proper flattening" #3466, so I'm not changing it here.Nested1
grants friendship to itsParent
, thenNested2
can now accessNested1
's internals._Locimp
.friend struct Meow;
can declareMeow
. The rules for this are complicated and we'd prefer not to have to think so hard. It's easier if we have separate forward declarations, followed by the "extended friend" syntax. Although this consumes an extra line, it's simpler becausefriend Meow;
is incapable of introducing a declaration.