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Make median non-mutating on arrays. #17154

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merged 1 commit into from
Jun 28, 2016
Merged

Make median non-mutating on arrays. #17154

merged 1 commit into from
Jun 28, 2016

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simonbyrne
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Due to a change in the behaviour of mapslices (#16260), median(X,k) would mutate the underlying array. Fixes #17153.

Due to a change in the behaviour of `mapslices` (#16260), `median(X,k)` would mutate the underlying array. Fixes #17153.
@tkelman
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tkelman commented Jun 27, 2016

How many more of these might there be?

@simonbyrne
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This is the only call to mapslices in Base, but may be more in packages.

@ranjanan
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ranjanan commented Jun 27, 2016

#16091 strikes again?

LoadError: MethodError: no method matching Base.Serializer.__deserialized_types__.##269()

@tkelman
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tkelman commented Jun 28, 2016

mapslices turns out to be quite a bit more widely used in packages than in base.

@ranjanan
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ranjanan commented Jun 28, 2016

@tkelman should this fix be merged? @timholy had some thoughts on the issue too. Also, does this need tests?

@JeffBezanson JeffBezanson merged commit a48676c into master Jun 28, 2016
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Passing a mutating function to a higher-order function is always a big red flag. It happens here because this is a strange case where the function returns a new result, but is allowed to overwrite its input.

@tkelman tkelman deleted the sb/median-slice branch June 28, 2016 15:12
ranjanan added a commit to ranjanan/julia that referenced this pull request Jun 28, 2016
tkelman pushed a commit that referenced this pull request Jul 18, 2016
* Add test for Issue #17153 and PR #17154

* Fix whitespaces
mfasi pushed a commit to mfasi/julia that referenced this pull request Sep 5, 2016
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4 participants