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Support reshaping custom 0-dimensional arrays #26870

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Apr 23, 2018
Merged

Support reshaping custom 0-dimensional arrays #26870

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c0f2bf2
Support reshaping custom 0-dimensional arrays
mbauman Apr 20, 2018
e95ec43
Remove Stateful change
mbauman Apr 20, 2018
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1 change: 1 addition & 0 deletions base/iterators.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1077,6 +1077,7 @@ else
# fixpoint.
function fixpoint_iter_type(itrT::Type, valT::Type, stateT::Type)
nextvalstate = Base._return_type(next, Tuple{itrT, stateT})
nextvalstate === Union{} && return Any
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Cc @Keno — I coupled this change here. The failure mode is join((), ","), which attempts to find the value type of next((), start(())) — that's an error and will always be Union{}. I'm assuming that a case like this was intended to be caught by the next line, but of course the bottom type is a subtype of everything so it flies on by and throws an error later. Would it be better to return Any or Union{} in this case?

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My stab in the dark here didn't work. I've just marked things as @test_broken and opened #26871.

nextvalstate <: Tuple{Any, Any} || return Any
nextvalstate = Tuple{
typejoin(valT, fieldtype(nextvalstate, 1)),
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5 changes: 5 additions & 0 deletions base/reshapedarray.jl
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Expand Up @@ -168,6 +168,11 @@ function __reshape(p::Tuple{AbstractArray,IndexCartesian}, dims::Dims)
ReshapedArray(parent, dims, reverse(mi))
end

function __reshape(p::Tuple{AbstractArray{<:Any,0},IndexCartesian}, dims::Dims)
parent = p[1]
ReshapedArray(parent, dims, ())
end

function __reshape(p::Tuple{AbstractArray,IndexLinear}, dims::Dims)
parent = p[1]
ReshapedArray(parent, dims, ())
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16 changes: 16 additions & 0 deletions test/arrayops.jl
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Expand Up @@ -189,6 +189,22 @@ end
end
end

struct Z26163 <: AbstractArray{Int,0}; end
Base.size(::Z26163) = ()
Base.getindex(::Z26163) = 0
struct V26163 <: AbstractArray{Int,1}; end
Base.size(::V26163) = (1,)
Base.getindex(::V26163, ::Int) = 0
@testset "reshape of custom zero- and one-dimensional arrays" begin
z = Z26163()
v = V26163()
@test z == reshape(v, ()) == fill(0, ())
@test reshape(z, 1) == v == [0]
@test reshape(z, 1, 1) == reshape(v, 1, 1) == fill(0, 1, 1)
@test occursin("1-element reshape", summary(reshape(z, 1)))
@test occursin("0-dimensional reshape", summary(reshape(v, ())))
end

@test reshape(1:5, (5,)) === 1:5
@test reshape(1:5, 5) === 1:5

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3 changes: 2 additions & 1 deletion test/strings/io.jl
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Expand Up @@ -144,7 +144,8 @@
end
end
@testset "join()" begin
@test join([]) == ""
@test join([]) == join(()) == ""
@test join([],",") == join((),",") == ""
@test join(["a"],"?") == "a"
@test join("HELLO",'-') == "H-E-L-L-O"
@test join(1:5, ", ", " and ") == "1, 2, 3, 4 and 5"
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