Parent for RangeCumSum returns the wrapped range (#214)

* Parent for RangeCumSum returns the wrapped range

* Add test

* Test unconditionally

Author: jishnub

Project.toml

@@ -1,7 +1,7 @@
 name = "ArrayLayouts"
 uuid = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"
 authors = ["Sheehan Olver <[email protected]>"]
-version = "1.7.0"
+version = "1.8.0"
 
 [deps]
 FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"

src/cumsum.jl

@@ -10,6 +10,8 @@ end
 size(c::RangeCumsum) = size(c.range)
 axes(c::RangeCumsum) = axes(c.range)
 
+Base.parent(r::RangeCumsum) = r.range
+
 ==(a::RangeCumsum, b::RangeCumsum) = a.range == b.range
 BroadcastStyle(::Type{<:RangeCumsum{<:Any,RR}}) where RR = BroadcastStyle(RR)
 

test/test_cumsum.jl

@@ -8,6 +8,7 @@ include("infinitearrays.jl")
     @testset for p in (Base.OneTo(5), 2:5, 2:2:6, 6:-2:1, -1.0:3.0:5.0, (-1.0:3.0:5.0)*im,
                         Base.IdentityUnitRange(4:6))
         r = RangeCumsum(p)
+        @test parent(r) == p
         @test r == r
         if axes(r) isa Base.OneTo
             @test r == cumsum(p)