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avoid vector allocation when PartitionIterator is cut short #41950

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Aug 24, 2021
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avoid vector allocation when PartitionIterator is cut short #41950

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2 changes: 1 addition & 1 deletion base/iterators.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1191,11 +1191,11 @@ end
struct IterationCutShort; end

function iterate(itr::PartitionIterator, state...)
v = Vector{eltype(itr.c)}(undef, itr.n)
# This is necessary to remember whether we cut the
# last element short. In such cases, we do return that
# element, but not the next one
state === (IterationCutShort(),) && return nothing
v = Vector{eltype(itr.c)}(undef, itr.n)
i = 0
y = iterate(itr.c, state...)
while y !== nothing
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