Propagate iteration to parent in OffsetArrays (#257)

* propagate iteration to parent

* Fix tests

Author: jishnub

src/OffsetArrays.jl

@@ -441,6 +441,8 @@ end
     A
 end
 
+@inline Base.iterate(a::OffsetArray, i...) = iterate(parent(a), i...)
+
 Base.in(x, A::OffsetArray) = in(x, parent(A))
 Base.copy(A::OffsetArray) = parent_call(copy, A)
 

test/runtests.jl

@@ -1492,6 +1492,12 @@ end
             @test a == d
         end
     end
+
+    v = ones(10)
+    for r in Any[1:1:10, 1:10], s in Any[r, collect(r)]
+        so = OffsetArray(s)
+        @test Float64[v[i] for i in s] == Float64[v[i] for i in so]
+    end
 end
 
 @testset "show/summary" begin