Add extension for ProximalCore/-Operators adapter

Project.toml

@@ -16,6 +16,9 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 VectorizationBase = "3d5dd08c-fd9d-11e8-17fa-ed2836048c2f"
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 
+[weakdeps]
+ProximalCore = "dc4f5ac2-75d1-4f31-931e-60435d74994b"
+
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
@@ -30,6 +33,10 @@ VectorizationBase = "0.19, 0.21"
 LinearOperatorCollection = "1.0"
 LinearOperators = "2.3.3"
 FFTW = "1.0"
+ProximalCore = "0.1"
 
 [targets]
 test = ["Test", "Random", "FFTW"]
+
+[extensions]
+RegularizedLeastSquaresProximalCore = "ProximalCore"

ext/RegularizedLeastSquaresProximalCore/RegularizedLeastSquaresProximalCore.jl

@@ -0,0 +1,19 @@
+module RegularizedLeastSquaresProximalCore
+
+using RegularizedLeastSquares, ProximalCore
+
+import RegularizedLeastSquares.prox!, RegularizedLeastSquares.ProximalCoreAdapter
+
+struct ProximalCoreAdapterImpl{T, F} <: ProximalCoreAdapter{T, F}
+  λ::T
+  op::F
+end
+
+RegularizedLeastSquares.ProximalCoreAdapter(λ::T, op::F) where {T, F} = ProximalCoreAdapterImpl(λ, op)
+
+function prox!(reg::ProximalCoreAdapter, x::AbstractArray{Tc}, λ::T) where {T, Tc <: Union{T, Complex{T}}}
+  ProximalCore.prox!(x, reg.op, x, λ)
+  return x
+end
+
+end

src/Regularization/Regularization.jl

@@ -67,6 +67,8 @@ include("TransformedRegularization.jl")
 include("MaskedRegularization.jl")
 include("PlugAndPlayRegularization.jl")
 
+export ProximalCoreAdapter
+abstract type ProximalCoreAdapter{T, F}  <: AbstractParameterizedRegularization{T} where F end 
 
 function findfirst(::Type{S}, reg::AbstractRegularization) where S <: AbstractRegularization
   regs = collect(reg)