Merge pull request #170 from chriselrod/definepointer

Defined pointer method.

Author: chriselrod

Project.toml

@@ -1,6 +1,6 @@
 name = "OffsetArrays"
 uuid = "6fe1bfb0-de20-5000-8ca7-80f57d26f881"
-version = "1.4.0"
+version = "1.4.1"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

src/OffsetArrays.jl

@@ -294,6 +294,10 @@ end
     A
 end
 
+Base.strides(A::OffsetArray) = strides(parent(A))
+Base.elsize(::Type{OffsetArray{T,N,A}}) where {T,N,A} = Base.elsize(A)
+@inline Base.unsafe_convert(::Type{Ptr{T}}, A::OffsetArray{T}) where {T} = Base.unsafe_convert(Ptr{T}, parent(A))
+
 # For fast broadcasting: ref https://discourse.julialang.org/t/why-is-there-a-performance-hit-on-broadcasting-with-offsetarrays/32194
 Base.dataids(A::OffsetArray) = Base.dataids(parent(A))
 Broadcast.broadcast_unalias(dest::OffsetArray, src::OffsetArray) = parent(dest) === parent(src) ? src : Broadcast.unalias(dest, src)

test/runtests.jl

@@ -1390,4 +1390,26 @@ end
     @test arr == adapt(Array, s_arr)
 end
 
+@testset "Pointer" begin
+    a = OffsetVector(collect(10:20), 9);
+    @test 12 == a[12] == unsafe_load(pointer(a), 12 + (1 - firstindex(a))) == unsafe_load(pointer(a, 12))
+
+    A = OffsetArray(reshape(collect(10:130), (11,11)), 9, 9);
+    @test 21 == A[12] == unsafe_load(pointer(A), 12) == unsafe_load(pointer(A, 12))
+    @test 61 == A[52] == unsafe_load(pointer(A), 52) == unsafe_load(pointer(A, 52))
+
+    @test pointer(a) === pointer(parent(a))
+    @test pointer(A) === pointer(parent(A))
+    @test pointer(a, 12) === pointer(parent(a), 12 + (1 - firstindex(a)))
+    @test pointer(A, 12) === pointer(parent(A), 12)
+    @test pointer(a) === pointer(a, firstindex(a))
+    @test pointer(A) === pointer(A, firstindex(A))
+    if VERSION ≥ v"1.5"
+        @test pointer(a') === pointer(parent(a))
+        @test pointer(A') === pointer(parent(A))
+        @test pointer(a', 5) === pointer(parent(a), 5)
+        @test pointer(A', 15) === pointer(parent(A)', 15)
+    end
+end
+
 include("origin.jl")