Merge pull request #309 from AayushSabharwal/as/broadcast-from-array

feat: add ability to set VectorOfArray with Array using broadcast

Author: ChrisRackauckas

src/vector_of_array.jl

@@ -663,10 +663,25 @@ end
     bc = Broadcast.flatten(bc)
     N = narrays(bc)
     @inbounds for i in 1:N
-        if dest[:, i] isa AbstractArray && !isa(dest[:, i], StaticArraysCore.SArray)
+        if dest[:, i] isa AbstractArray && ArrayInterface.ismutable(dest[:, i])
             copyto!(dest[:, i], unpack_voa(bc, i))
         else
-            dest[:, i] = copy(unpack_voa(bc, i))
+            unpacked = unpack_voa(bc, i)
+            dest[:, i] = unpacked.f(unpacked.args...)
+        end
+    end
+    dest
+end
+
+@inline function Base.copyto!(dest::AbstractVectorOfArray,
+    bc::Broadcast.Broadcasted{<:Broadcast.DefaultArrayStyle})
+    bc = Broadcast.flatten(bc)
+    @inbounds for i in 1:length(dest.u)
+        if dest[:, i] isa AbstractArray && ArrayInterface.ismutable(dest[:, i])
+            copyto!(dest[:, i], unpack_voa(bc, i))
+        else
+            unpacked = unpack_voa(bc, i)
+            dest[:, i] = unpacked.f(unpacked.args...)
         end
     end
     dest

test/interface_tests.jl

@@ -125,3 +125,27 @@ z = VectorOfArray([zeros(SVector{2, Float64}), zeros(SVector{2, Float64})])
 z .= x .+ y
 
 @test z == VectorOfArray([fill(4, SVector{2, Float64}), fill(2, SVector{2, Float64})])
+
+u1 = VectorOfArray([fill(2, SVector{2, Float64}), ones(SVector{2, Float64})])
+u2 = VectorOfArray([fill(4, SVector{2, Float64}), 2 .* ones(SVector{2, Float64})])
+u3 = VectorOfArray([fill(4, SVector{2, Float64}), 2 .* ones(SVector{2, Float64})])
+
+function f(u1,u2,u3)
+    u3 .= u1 .+ u2
+end
+f(u1,u2,u3)
+@test (@allocated f(u1,u2,u3)) == 0 
+
+yy = [2.0 1.0; 2.0 1.0]
+zz = x .+ yy
+@test zz == [4.0 2.0; 4.0 2.0]
+
+z = VectorOfArray([zeros(SVector{2, Float64}), zeros(SVector{2, Float64})])
+z .= zz
+@test z == VectorOfArray([fill(4, SVector{2, Float64}), fill(2, SVector{2, Float64})])
+
+function f!(z,zz)
+    z .= zz
+end
+f!(z,zz)
+@test (@allocated f!(z,zz)) == 0