Generalize eltype pass-through to all AbstractFloat (fixes #308) (#317)

Author: timholy

src/b-splines/b-splines.jl

@@ -147,7 +147,7 @@ end
 
 # We can't just return a tuple-of-types due to julia #12500
 tweight(A::AbstractArray) = Float64
-tweight(A::AbstractArray{Float32}) = Float32
+tweight(A::AbstractArray{T}) where T<:AbstractFloat = T
 tweight(A::AbstractArray{Rational{Int}}) = Rational{Int}
 tweight(A::AbstractArray{T}) where {T<:Integer} = typeof(float(zero(T)))
 

test/b-splines/runtests.jl

@@ -6,4 +6,6 @@
     include("mixed.jl")
     include("multivalued.jl")
     include("non1.jl")
+
+    @test eltype(@inferred(interpolate(rand(Float16, 3, 3), BSpline(Linear())))) == Float16 # issue #308
 end