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UnsetSpace compatibility with other spaces #145

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UnsetSpace compatibility with other spaces #145

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2 changes: 2 additions & 0 deletions src/Space.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,8 @@ canonicaldomain(S::Space) = canonicaldomain(domain(S))
# This is used in place of == to support AnyDomain
spacescompatible(f::D,g::D) where D<:Space = error("Override spacescompatible for "*string(D))
spacescompatible(::UnsetSpace,::UnsetSpace) = true
spacescompatible(::Space, ::UnsetSpace) = true
spacescompatible(::UnsetSpace, ::Space) = true
spacescompatible(::NoSpace,::NoSpace) = true
spacescompatible(f,g) = false
==(A::Space,B::Space) = spacescompatible(A,B) && domain(A) == domain(B)
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5 changes: 5 additions & 0 deletions test/SpacesTest.jl
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Expand Up @@ -173,5 +173,10 @@ using ApproxFunOrthogonalPolynomials
v = rand(4)
v2 = transform(NormalizedChebyshev(), v)
@test itransform(NormalizedChebyshev(), v2) ≈ v

@testset "ApproxFun.jl issue 616" begin
x, D = Fun(), Derivative(Chebyshev())
@test (D*Multiplication(x)*D)*x ≈ 1
end
end
end