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fix: add specialized promotion rule for SArray and MArray #145

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fix: add specialized promotion rule for SArray and MArray #145

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fix: add specialized promotion rule for SArray and MArray
henry2004y May 19, 2026
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henry2004y May 19, 2026
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6 changes: 6 additions & 0 deletions src/core/utils.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,12 @@ Same logic as `_series_output_type` but accepts varargs for ND promotion
chains like `promote_type(Tv, Tg, Tq)`.
"""
@inline function _output_eltype(::Type{Tv}, types::Type...) where {Tv}
tn = Base.typename(Tv)
if tn.name === :SArray || tn.name === :MArray
Te = promote_type(eltype(Tv), types...)
params = Tv.parameters
return tn.wrapper{params[1], Te, params[3], params[4]}
end
Tr = promote_type(Tv, types...)
Tc = isconcretetype(Tr) ? Tr : Tv
# Ensure standard numerics produce Float coefficients (Int→Float64).
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9 changes: 9 additions & 0 deletions test/ext/test_autodiff_ForwardDiff.jl
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Expand Up @@ -1403,4 +1403,13 @@ const FI = FastInterpolations
@test cache_pb isa CubicSplineCache{DualT}
end

@testset "SVector / StaticArray AD support" begin
using StaticArrays
x = 1.0:10.0
y = [SA[t^2, 2.0 * t, 3.0] for t in x]
itp = linear_interp(x, y)
res = ForwardDiff.derivative(t -> itp(t)[1], 2.5)
@test res ≈ 5.0 atol = 1.0e-10
end

end # testset "AutoDiff Support"
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