feat: add ConstructionBaseExt to allow Setfield and Functors support (#94)

* feat: add ConstructionBaseExt to allow Setfield and Functors support

* refactor: bypass incorrect original type ordering in constructor

Author: avik-pal

Project.toml

@@ -1,22 +1,26 @@
 name = "ADTypes"
 uuid = "47edcb42-4c32-4615-8424-f2b9edc5f35b"
 authors = ["Vaibhav Dixit <[email protected]>, Guillaume Dalle and contributors"]
-version = "1.9.1"
+version = "1.10.0"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
+ConstructionBase = "187b0558-2788-49d3-abe0-74a17ed4e7c9"
 EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869"
 
 [weakdeps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
+ConstructionBase = "187b0558-2788-49d3-abe0-74a17ed4e7c9"
 EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869"
 
 [extensions]
 ADTypesChainRulesCoreExt = "ChainRulesCore"
+ADTypesConstructionBaseExt = "ConstructionBase"
 ADTypesEnzymeCoreExt = "EnzymeCore"
 
 [compat]
 ChainRulesCore = "1.0.2"
+ConstructionBase = "1.5"
 EnzymeCore = "0.5.3,0.6,0.7,0.8"
 julia = "1.6"
 
@@ -25,7 +29,8 @@ Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
 EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869"
 JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
+Setfield = "efcf1570-3423-57d1-acb7-fd33fddbac46"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Aqua", "ChainRulesCore", "EnzymeCore", "JET", "Test"]
+test = ["Aqua", "ChainRulesCore", "EnzymeCore", "JET", "Setfield", "Test"]

ext/ADTypesConstructionBaseExt.jl

@@ -0,0 +1,22 @@
+module ADTypesConstructionBaseExt
+
+using ADTypes: AutoEnzyme, AutoForwardDiff, AutoPolyesterForwardDiff
+using ConstructionBase: ConstructionBase
+
+struct InternalAutoEnzymeReconstructor{A} end
+
+InternalAutoEnzymeReconstructor{A}(mode::M) where {M, A} = AutoEnzyme{M, A}(mode)
+
+function ConstructionBase.constructorof(::Type{<:AutoEnzyme{M, A}}) where {M, A}
+    return InternalAutoEnzymeReconstructor{A}
+end
+
+function ConstructionBase.constructorof(::Type{<:AutoForwardDiff{chunksize}}) where {chunksize}
+    return AutoForwardDiff{chunksize}
+end
+
+function ConstructionBase.constructorof(::Type{<:AutoPolyesterForwardDiff{chunksize}}) where {chunksize}
+    return AutoPolyesterForwardDiff{chunksize}
+end
+
+end

src/dense.jl

@@ -181,8 +181,10 @@ struct AutoForwardDiff{chunksize, T} <: AbstractADType
     tag::T
 end
 
+AutoForwardDiff{chunksize}(tag::T) where {chunksize, T} = AutoForwardDiff{chunksize, T}(tag)
+
 function AutoForwardDiff(; chunksize = nothing, tag = nothing)
-    AutoForwardDiff{chunksize, typeof(tag)}(tag)
+    return AutoForwardDiff{chunksize}(tag)
 end
 
 mode(::AutoForwardDiff) = ForwardMode()
@@ -271,8 +273,12 @@ struct AutoPolyesterForwardDiff{chunksize, T} <: AbstractADType
     tag::T
 end
 
+function AutoPolyesterForwardDiff{chunksize}(tag::T) where {chunksize, T}
+    return AutoPolyesterForwardDiff{chunksize, T}(tag)
+end
+
 function AutoPolyesterForwardDiff(; chunksize = nothing, tag = nothing)
-    AutoPolyesterForwardDiff{chunksize, typeof(tag)}(tag)
+    return AutoPolyesterForwardDiff{chunksize}(tag)
 end
 
 mode(::AutoPolyesterForwardDiff) = ForwardMode()

test/misc.jl

@@ -61,3 +61,36 @@ for backend in [
 ]
     println(backend)
 end
+
+using Setfield
+
+@testset "Setfield compatibility" begin
+    ad = AutoEnzyme()
+    @test ad.mode === nothing
+    @set! ad.mode = EnzymeCore.Reverse
+    @test ad.mode isa EnzymeCore.ReverseMode
+
+    struct CustomTestTag end
+
+    ad = AutoForwardDiff()
+    @test ad.tag === nothing
+    @set! ad.tag = CustomTestTag()
+    @test ad.tag isa CustomTestTag
+
+    ad = AutoForwardDiff(; chunksize = 10)
+    @test ad.tag === nothing
+    @set! ad.tag = CustomTestTag()
+    @test ad.tag isa CustomTestTag
+    @test ad isa AutoForwardDiff{10}
+
+    ad = AutoPolyesterForwardDiff()
+    @test ad.tag === nothing
+    @set! ad.tag = CustomTestTag()
+    @test ad.tag isa CustomTestTag
+
+    ad = AutoPolyesterForwardDiff(; chunksize = 10)
+    @test ad.tag === nothing
+    @set! ad.tag = CustomTestTag()
+    @test ad.tag isa CustomTestTag
+    @test ad isa AutoPolyesterForwardDiff{10}
+end