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Provide 0.6 implementation of collect for previous releases #350

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Apr 19, 2017
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Provide 0.6 implementation of collect for previous releases #350

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3 changes: 3 additions & 0 deletions README.md
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Expand Up @@ -80,6 +80,8 @@ Currently, the `@compat` macro supports the following syntaxes:

* `@compat Base.IndexStyle(::Type{<:MyArray}) = IndexLinear()` and `@compat Base.IndexStyle(::Type{<:MyArray}) = IndexCartesian()` to define traits for abstract arrays, replacing the former `Base.linearindexing{T<:MyArray}(::Type{T}) = Base.LinearFast()` and `Base.linearindexing{T<:MyArray}(::Type{T}) = Base.LinearSlow()`, respectively.

* `Compat.collect(A)` returns an Array even on 0.5, no matter what indices the array `A` has. [#21257]

## Module Aliases

* In 0.6, some 0.5 iterator functions have been moved to the `Base.Iterators`
Expand Down Expand Up @@ -363,3 +365,4 @@ includes this fix. Find the minimum version from there.
[#20500]: https://github.com/JuliaLang/julia/issues/20500
[#18629]: https://github.com/JuliaLang/julia/pull/18629
[#21346]: https://github.com/JuliaLang/julia/pull/21346
[#21257]: https://github.com/JuliaLang/julia/pull/21257
14 changes: 14 additions & 0 deletions src/Compat.jl
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Expand Up @@ -1471,6 +1471,20 @@ else
using Base: StringVector
end

# https://github.com/JuliaLang/julia/pull/21257
if v"0.5.0" <= VERSION < v"0.6.0-pre.beta.28"
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why the 0.5 lower bound?

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OffsetArrays in its modern form only exists for 0.5 and above, though it's nice that older versions are installable on 0.4 and thus avoid giving us an error just from test/REQUIRE. Moreover, I'm not sure the necessary copy! method was available on 0.4. In general any support that 0.4 would have for arrays with nontraditional indices would be a fluke, and no one should even try to use them; this test is only relevant on 0.5 and above.

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It wasn't the release that made this method relevant though...

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Do we really want to be encouraging 0.5 pre-releases at this point?

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Note that in the README I specified that Compat.collect is for 0.5 and above.

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encourage no, but Compat's job is to work on as much of its supported version range as possible

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"even on 0.5" isn't the clearest way of phrasing that

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#351

collect(A) = collect_indices(indices(A), A)
collect_indices(::Tuple{}, A) = copy!(Array{eltype(A)}(), A)
collect_indices(indsA::Tuple{Vararg{Base.OneTo}}, A) =
copy!(Array{eltype(A)}(map(length, indsA)), A)
function collect_indices(indsA, A)
B = Array{eltype(A)}(map(length, indsA))
copy!(B, CartesianRange(indices(B)), A, CartesianRange(indsA))
end
else
const collect = Base.collect
end

include("to-be-deprecated.jl")

end # module Compat
1 change: 1 addition & 0 deletions test/REQUIRE
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@@ -0,0 +1 @@
OffsetArrays
9 changes: 9 additions & 0 deletions test/runtests.jl
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Expand Up @@ -1831,6 +1831,15 @@ let x = fill!(StringVector(5), 0x61)
@test pointer(x) == pointer(Compat.UTF8String(x))
end

# collect
if VERSION >= v"0.5.0"
using OffsetArrays
a = OffsetArray(1:3, -1:1)
b = Compat.collect(a)
@test indices(b) === (Base.OneTo(3),)
@test b == [1,2,3]
end

include("to-be-deprecated.jl")

nothing