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Define monomial_type for tuple of variables #99

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Merged
blegat merged 1 commit into from
Mar 14, 2026
Merged

Define monomial_type for tuple of variables #99

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9 changes: 9 additions & 0 deletions src/promotion.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -50,3 +50,12 @@ end
vars = merge(V1, V2...)
Monomial{vars, length(vars)}
end

function MP.monomial_type(vars::Tuple{V,Vararg{Variable}}) where {V<:Variable}
sorted = merge((first(vars),), Base.tail(vars)...)
return Monomial{sorted, length(sorted)}
end

function MP.monomial_type(::Type{T}) where {T<:Tuple{Variable,Vararg{Variable}}}
return monomial_type(tuple((V() for V in fieldtypes(T))...))
end
17 changes: 17 additions & 0 deletions test/promotion.jl
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Expand Up @@ -41,6 +41,23 @@
@test typeof(@inferred(promote(x, Monomial{tuple(), 0}()))) == NTuple{2, Monomial{(x,), 1}}
end

@testset "monomial_type for variable tuples" begin
@polyvar x y z

@test @inferred(monomial_type((x,))) == Monomial{(x,), 1}
@test @inferred(monomial_type((x,))) == monomial_type(x)
@test @inferred(monomial_type((x, y))) == Monomial{(x, y), 2}
@test @inferred(monomial_type((x, y))) == typeof(x * y)
@test @inferred(monomial_type((y, x))) == Monomial{(x, y), 2}
@test @inferred(monomial_type((x, y, z))) == Monomial{(x, y, z), 3}
@test @inferred(monomial_type((x, y, z))) == typeof(x * y * z)
@test @inferred(monomial_type((z, x, y))) == Monomial{(x, y, z), 3}

@test @inferred(monomial_type(typeof((x,)))) == Monomial{(x,), 1}
@test @inferred(monomial_type(typeof((x, y)))) == Monomial{(x, y), 2}
@test @inferred(monomial_type(typeof((x, y, z)))) == Monomial{(x, y, z), 3}
end

@testset "conversion" begin
@polyvar x y z

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