With slices, you can do
slice = slice[:0]
to remove the values from the slice, but keep the backing slice with the
same capacity (although the elements aren't marked for GC I believe, if
that's a concern). With maps, is there a similar pattern? I've tried:
for key := range m {
delete(m, key)
}
But this doesn't seem to work, I still see allocations (and it causes a
significant performance hit, which makes sense).
Even something similar to https://golang.org/cl/137880043 if we had to
clear the actual values would be great.
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