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Make equality of factorizations give error (instead of false) #2188

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Make equality of factorizations give error (instead of false) #2188

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7e8619a
Make equality of factorizations give error (instead of false)
JohnAAbbott Oct 16, 2025
4f00952
Added basic test
JohnAAbbott Oct 20, 2025
4b8fa67
Equality test of factorizations ALWAYS gives error; updated tests
JohnAAbbott Oct 20, 2025
7f40048
Removed cruft
JohnAAbbott Oct 20, 2025
9d85021
Apply suggestions from code review
fingolfin Oct 22, 2025
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4 changes: 4 additions & 0 deletions src/Factor.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,10 @@ _is_legal(a::Fac) = xor(isdefined(a, :fac), isdefined(a, :arr))

_is_dic(a::Fac) = _is_legal(a) && isdefined(a, :fac)

function Base.:(==)(F1::Fac, F2::Fac)
error("Equality testing of factorizations is not supported")
end

@doc raw"""
unit(a::Fac{T}) -> T

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9 changes: 9 additions & 0 deletions test/Factor-test.jl
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Expand Up @@ -29,3 +29,12 @@ end
@test string(f) == "x * (x + y) * (x*y)" ||
string(f) == "x * (x*y) * (x + y)"
end

@testset "Fac.equality" begin
# 2025-10-20 equality test on factorizations always gives error (even if the args are ===)
f = Fac(-1, Dict{Int, Int}(2 => 3, 3 => 1))
ff = Fac(-1, [2 => 3, 3 => 1])

@test_throws ErrorException f == f
@test_throws ErrorException (f == ff)
end
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