Hey, does anybody know why a generator does allocate memory while an iterator does

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1

Hey, does anybody know why a generator does allocate memory while an iterator doesn’t when assigned to an existing location?

julia> x = randn((1000));

julia> y = 1:1000
1:1000

julia> g = (i for i=1:1000)
Base.Generator{UnitRange{Int64}, typeof(identity)}(identity, 1:1000)

julia> @time x .= g;
  0.000020 seconds (3 allocations: 7.969 KiB)

julia> @time x .= g;
  0.000030 seconds (3 allocations: 7.969 KiB)

julia> @time x .= y;
  0.000048 seconds (3 allocations: 96 bytes)

julia> @time x .= y;
  0.000027 seconds (3 allocations: 96 bytes)

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2

Citing @mcabbott:

“Generators get collected when used with broadcasting”.

This issue goes into a similar direction.

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