Resolve ambiguity in infinite banded subarray broadcaststyle (#180)

* Resolve ambiguity in infinite banded subarray broadcaststyle

* Update test_infbanded.jl

Author: dlfivefifty

Project.toml

@@ -1,6 +1,6 @@
 name = "InfiniteLinearAlgebra"
 uuid = "cde9dba0-b1de-11e9-2c62-0bab9446c55c"
-version = "0.8"
+version = "0.8.1"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"

src/InfiniteLinearAlgebra.jl

@@ -19,7 +19,7 @@ import ArrayLayouts: AbstractBandedLayout, AbstractQLayout, AdjQRPackedQLayout,
                      rowsupport, sub_materialize, subdiagonaldata, sublayout, supdiagonaldata, transposelayout,
                      triangulardata, triangularlayout, zero!, materialize!
 
-import BandedMatrices: BandedColumns, BandedMatrix, BandedMatrix, _BandedMatrix,
+import BandedMatrices: BandedColumns, BandedMatrix, BandedMatrix, _BandedMatrix, AbstractBandedMatrix,
                        _BandedMatrix, _BandedMatrix, _banded_qr, _banded_qr!, _default_banded_broadcast, banded_chol!,
                        banded_similar, bandedcolumns, bandeddata, bandwidths, bandwidths
 
@@ -32,7 +32,7 @@ import BlockBandedMatrices: AbstractBlockBandedLayout, BlockBandedMatrix, BlockS
 
 import FillArrays: AbstractFill, AbstractFillMatrix, axes_print_matrix_row, getindex_value
 
-import InfiniteArrays: AbstractInfUnitRange, InfAxes, InfRanges, InfStepRange, InfUnitRange, OneToInf, PosInfinity
+import InfiniteArrays: AbstractInfUnitRange, InfAxes, InfRanges, InfStepRange, InfUnitRange, OneToInf, PosInfinity, InfIndexRanges
 
 import Infinities: InfiniteCardinal, Infinity
 

src/banded/infbanded.jl

@@ -1,3 +1,5 @@
+BroadcastStyle(::Type{<:SubArray{<:Any,2,<:AbstractBandedMatrix,<:Tuple{<:InfIndexRanges,<:InfIndexRanges}}})= LazyArrayStyle{2}()
+
 _BandedMatrix(data::AbstractMatrix{T}, ::Infinity, l, u) where T = _BandedMatrix(data, ℵ₀, l, u)
 
 ###

test/test_infbanded.jl

@@ -64,6 +64,7 @@ using Base: oneto
         @test T[2:∞,3:∞] isa SubArray
         @test exp.(T) isa BroadcastMatrix
         @test exp.(T)[2:∞,3:∞] isa SubArray
+        @test exp.(T[2:∞,3:∞]) isa BroadcastMatrix
 
         B = LazyBandedMatrices.Bidiagonal(Fill(1,∞), Zeros(∞), :U)
         @test B[2:∞,3:∞] isa SubArray