fix ambiguities with Base/OffsetArrays (#233)

Project.toml

@@ -1,6 +1,6 @@
 name = "StructArrays"
 uuid = "09ab397b-f2b6-538f-b94a-2f83cf4a842a"
-version = "0.6.9"
+version = "0.6.10"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

src/structarray.jl

@@ -276,13 +276,6 @@ Base.convert(::Type{StructArray}, v::StructArray) = v
 Base.convert(::Type{StructVector}, v::AbstractVector) = StructVector(v)
 Base.convert(::Type{StructVector}, v::StructVector) = v
 
-# Mimic OffsetArrays signatures
-const OffsetAxisKnownLength = Union{Integer, AbstractUnitRange}
-const OffsetAxis = Union{OffsetAxisKnownLength, Colon}
-
-const OffsetShapeKnownLength = Tuple{OffsetAxisKnownLength,Vararg{OffsetAxisKnownLength}}
-const OffsetShape = Tuple{OffsetAxis,Vararg{OffsetAxis}}
-
 # Helper function to avoid adding too many dispatches to `Base.similar`
 function _similar(s::StructArray{T}, ::Type{T}, sz) where {T}
     return StructArray{T}(map(typ -> similar(typ, sz), components(s)))
@@ -296,7 +289,13 @@ function _similar(s::StructArray{T}, S::Type, sz) where {T}
     return isnonemptystructtype(S) ? buildfromschema(typ -> similar(c1, typ, sz), S) : similar(c1, S, sz)
 end
 
-for type in (:Dims, :OffsetShapeKnownLength)
+for type in (
+        :Dims,
+        # mimic OffsetArrays signature
+        :(Tuple{Union{Integer, AbstractUnitRange}, Vararg{Union{Integer, AbstractUnitRange}}}),
+        # disambiguation with Base
+        :(Tuple{Union{Integer, Base.OneTo}, Vararg{Union{Integer, Base.OneTo}}}),
+    )
     @eval function Base.similar(::Type{<:StructArray{T, N, C}}, sz::$(type)) where {T, N, C}
         return buildfromschema(typ -> similar(typ, sz), T, C)
     end
@@ -457,7 +456,16 @@ end
 
 Base.copy(s::StructArray{T}) where {T} = StructArray{T}(map(copy, components(s)))
 
-for type in (:Dims, :OffsetShape)
+for type in (
+        :Dims,
+        # mimic OffsetArrays signature
+        :(Tuple{Union{Integer, AbstractUnitRange, Colon}, Vararg{Union{Integer, AbstractUnitRange, Colon}}}),
+        # disambiguation with Base
+        :(Tuple{Union{Integer, Base.OneTo}, Vararg{Union{Integer, Base.OneTo}}}),
+        :(Tuple{Vararg{Union{Colon, Integer}}}),
+        :(Tuple{Vararg{Union{Colon, Int}}}),
+        :(Tuple{Colon}),
+    )
     @eval function Base.reshape(s::StructArray{T}, d::$(type)) where {T}
         StructArray{T}(map(x -> reshape(x, d), components(s)))
     end

test/runtests.jl

@@ -354,6 +354,24 @@ end
     s = similar(t, Float32, 0:1, 2)
     @test s isa OffsetMatrix{Float32, Matrix{Float32}}
     @test axes(s) == (0:1, 1:2)
+
+    s = similar(t, ComplexF64, (Base.OneTo(2),))
+    @test s isa StructArray
+    @test s.re isa Vector{Float64}
+    @test axes(s) == (1:2,)
+
+    s = similar(t, Int, (Base.OneTo(2),))
+    @test s isa Vector{Int}
+    @test axes(s) == (1:2,)
+
+    s = similar(t, ComplexF64, (Base.IdentityUnitRange(5:7),))
+    @test s isa StructArray
+    @test s.re isa OffsetVector{Float64}
+    @test axes(s) == (5:7,)
+
+    s = similar(t, Int, (Base.IdentityUnitRange(5:7),))
+    @test s isa OffsetVector{Int}
+    @test axes(s) == (5:7,)
 end
 
 @testset "similar type" begin
@@ -844,13 +862,30 @@ end
 
 @testset "reshape" begin
     s = StructArray(a=[1,2,3,4], b=["a","b","c","d"])
+
     rs = reshape(s, (2, 2))
     @test rs.a == [1 3; 2 4]
     @test rs.b == ["a" "c"; "b" "d"]
 
+    rs = reshape(s, (:,))
+    @test rs.a == s.a
+    @test rs.b == s.b
+
+    rs = reshape(s, (2, :))
+    @test rs.a == [1 3; 2 4]
+    @test rs.b == ["a" "c"; "b" "d"]
+
+    rs = reshape(s, (2, Base.OneTo(2)))
+    @test rs.a == [1 3; 2 4]
+    @test rs.b == ["a" "c"; "b" "d"]
+
     rs = reshape(s, (0:1, :))
     @test rs.a == OffsetArray([1 3; 2 4], (-1, 0))
     @test rs.b == OffsetArray(["a" "c"; "b" "d"], (-1, 0))
+
+    rs = reshape(s, (0:1, 1:2))
+    @test rs.a == OffsetArray([1 3; 2 4], (-1, 0))
+    @test rs.b == OffsetArray(["a" "c"; "b" "d"], (-1, 0))
 end
 
 @testset "lazy" begin
@@ -1072,6 +1107,28 @@ Base.similar(bc::Broadcast.Broadcasted{Broadcast.ArrayStyle{MyArray}}, ::Type{El
     @test @inferred(broadcast(el -> el.a, v)) == ["s1", "s2"]
 end
 
+@testset "map" begin
+    s = StructArray(a=[1, 2, 3])
+
+    t = @inferred(map(x -> x, s))
+    @test t isa StructArray
+    @test t == s
+
+    t = @inferred(map(x -> x.a, s))
+    @test t isa Vector
+    @test t == [1, 2, 3]
+
+    t = VERSION >= v"1.7" ? @inferred(map(x -> (a=x.a, b=2), s)) : map(x -> (a=x.a, b=2), s)
+    @test t isa StructArray
+    @test map(x -> (a=x.a, b=2), s) == [(a=1, b=2), (a=2, b=2), (a=3, b=2)]
+
+    so = reshape(s, Base.IdentityUnitRange(11:13))
+    to = @inferred(map(x -> x, so))
+    @test to isa StructArray
+    @test axes(to) == axes(so)
+    @test to == so
+end
+
 @testset "staticarrays" begin
     # test that staticschema returns the right things
     for StaticVectorType = [SVector, MVector, SizedVector]