move Adapt to ext

And use curried adapter to avoid possible instability

Project.toml

@@ -3,21 +3,22 @@ uuid = "09ab397b-f2b6-538f-b94a-2f83cf4a842a"
 version = "0.6.16"
 
 [deps]
-Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
 ConstructionBase = "187b0558-2788-49d3-abe0-74a17ed4e7c9"
 DataAPI = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
 [weakdeps]
+Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
 GPUArraysCore = "46192b85-c4d5-4398-a991-12ede77f4527"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
 [extensions]
+StructArraysAdaptExt = "Adapt"
 StructArraysGPUArraysCoreExt = "GPUArraysCore"
 StructArraysStaticArraysExt = "StaticArrays"
 
 [compat]
-Adapt = "1, 2, 3"
+Adapt = "2, 3"
 ConstructionBase = "1"
 DataAPI = "1"
 GPUArraysCore = "0.1.2"

ext/StructArraysAdaptExt.jl

@@ -0,0 +1,16 @@
+module StructArraysAdaptExt
+# Use Adapt allows for automatic conversion of CPU to GPU StructArrays
+using Adapt, StructArrays
+@static if !applicable(Adapt.adapt, Int)
+    # Adapt.jl has curried support, implement it ourself
+    adpat(to) = Base.Fix1(Adapt.adapt, to)
+    if VERSION < v"1.9.0-DEV.857"
+        @eval function adapt(to::Type{T}) where {T}
+            (@isdefined T) || return Base.Fix1(Adapt.adapt, to)
+            AT = Base.Fix1{typeof(Adapt.adapt),Type{T}}
+            return $(Expr(:new, :AT, :(Adapt.adapt), :to))
+        end
+    end
+end
+Adapt.adapt_structure(to, s::StructArray) = replace_storage(adapt(to), s)
+end

src/StructArrays.jl

@@ -25,11 +25,8 @@ function refvalue(s::StructArray{T}, v::Tup) where {T}
     createinstance(T, map(refvalue, components(s), v)...)
 end
 
-# Use Adapt allows for automatic conversion of CPU to GPU StructArrays
-import Adapt
-Adapt.adapt_structure(to, s::StructArray) = replace_storage(x->Adapt.adapt(to, x), s)
-
 @static if !isdefined(Base, :get_extension)
+    include("../ext/StructArraysAdaptExt.jl")
     include("../ext/StructArraysGPUArraysCoreExt.jl")
     include("../ext/StructArraysStaticArraysExt.jl")
 end