FlattenedIterator.opIndex

Undocumented in source. Be warned that the author may not have intended to support it.
struct FlattenedIterator(Iterator, size_t N, SliceKind kind)
ref
@optmath
opIndex
()
(
ptrdiff_t index
)
if (
N > 1 &&
(
kind == Universal ||
kind == Canonical
)
)

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