support for empty colsupport (#5)

Author: dlfivefifty

Project.toml

@@ -1,7 +1,7 @@
 name = "ArrayLayouts"
 uuid = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"
 authors = ["Sheehan Olver <[email protected]>"]
-version = "0.1.4"
+version = "0.1.5"
 
 [deps]
 FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"

src/diagonal.jl

@@ -1,6 +1,6 @@
 
-rowsupport(::DiagonalLayout, _, k) = minimum(k):maximum(k)
-colsupport(::DiagonalLayout, _, j) = minimum(j):maximum(j)
+rowsupport(::DiagonalLayout, _, k) = isempty(k) ? (1:0) : minimum(k):maximum(k)
+colsupport(::DiagonalLayout, _, j) = isempty(j) ? (1:0) : minimum(j):maximum(j)
 
 ###
 # Lmul

src/triangular.jl

@@ -1,7 +1,7 @@
-colsupport(::TriangularLayout{'L'}, A, j) = colsupport(triangulardata(A), j) ∩ (minimum(j):size(A,1))
-colsupport(::TriangularLayout{'U'}, A, j) = colsupport(triangulardata(A), j) ∩ OneTo(maximum(j))
-rowsupport(::TriangularLayout{'U'}, A, j) = rowsupport(triangulardata(A), j) ∩ (minimum(j):size(A,2))
-rowsupport(::TriangularLayout{'L'}, A, j) = rowsupport(triangulardata(A), j) ∩ OneTo(maximum(j))
+colsupport(::TriangularLayout{'L'}, A, j) = isempty(j) ? (1:0) : colsupport(triangulardata(A), j) ∩ (minimum(j):size(A,1))
+colsupport(::TriangularLayout{'U'}, A, j) = isempty(j) ? (1:0) : colsupport(triangulardata(A), j) ∩ OneTo(maximum(j))
+rowsupport(::TriangularLayout{'U'}, A, j) = isempty(j) ? (1:0) : rowsupport(triangulardata(A), j) ∩ (minimum(j):size(A,2))
+rowsupport(::TriangularLayout{'L'}, A, j) = isempty(j) ? (1:0) : rowsupport(triangulardata(A), j) ∩ OneTo(maximum(j))