use fieldcount

Author: oxinabox

src/tangent.jl

@@ -229,8 +229,8 @@ function Base.getindex(tb::TaylorBundle, tti::CanonicalTangentIndex)
 end
 
 "for a TaylorTangent{N, <:Tuple} this breaks it up unto 1 TaylorTangent{N} for each element of the primal tuple"
-function destructure(r::TaylorTangent{N, B}) where {N, B<:Tuple}
-    return ntuple(length(fieldnames(B))) do field_ii
+function zip(r::TaylorTangent{N, B}) where {N, B<:Tuple}
+    return ntuple(fieldcount(B)) do field_ii
         the_primal = primal(r)[field_ii]
         the_partials = ntuple(N) do  order_ii
             partial(r, order_ii)[field_ii]