Remove R2RAdjointStyle (out of scope)

Author: gaurav-arya

src/fft.jl

@@ -1064,23 +1064,3 @@ end
 AbstractFFTs.AdjointStyle(::cFFTWPlan) = AbstractFFTs.FFTAdjointStyle()
 AbstractFFTs.AdjointStyle(::rFFTWPlan{T, FORWARD}) where {T} = AbstractFFTs.RFFTAdjointStyle()
 AbstractFFTs.AdjointStyle(P::rFFTWPlan{T, BACKWARD}) where {T} = AbstractFFTs.IRFFTAdjointStyle(P.osz[first(P.region)])
-AbstractFFTs.AdjointStyle(P::r2rFFTWPlan) = AbstractFFTs.R2RAdjointStyle(P.kinds)
-
-AbstractFFTs._output_size(p::Plan, ::R2RAdjointStyle) = size(p)
-
-# TODO: this needs finishing
-function AbstractFFTs.adjoint_mul(p::Plan{T}, x::AbstractArray, PS::R2RAdjointStyle) where {T}
-    kinds = PS.kinds
-    dims = fftdims(p)
-
-    N = 1
-    # Ref: https://www.fftw.org/fftw3_doc/1d-Real_002deven-DFTs-_0028DCTs_0029.html
-    # Normalization: P \ P * u = K * u
-    # 0, 1 , 2   : FFTAdjointStyle() type: K = prod(size(N))
-    # 3, 6 : DCTs: K = 2 * (N - 1)
-    # 4, 5 : DCTs: K = 2 * N
-    # 7, 10: DSTs: K = 2 * (N + 1)
-    # 8, 9 : DSTs: K = 2 * N
-    return (p.p \ x) / N
-end
-