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Add flexibility in dispatch for iszero_tuple #667

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Add flexibility in dispatch for iszero_tuple #667

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3 changes: 3 additions & 0 deletions src/dual.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,9 @@ end
##########
Base.ArithmeticStyle(::Type{<:Dual{T,V}}) where {T,V} = Base.ArithmeticStyle(V)

unwrap_dual(::Type{Dual{T,V,N}}) where {T,V,N} = unwrap_dual(V)
unwrap_dual(::Type{V}) where V = V

##############
# Exceptions #
##############
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6 changes: 5 additions & 1 deletion src/partials.jl
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Expand Up @@ -163,7 +163,11 @@ end
@inline rand_tuple(::AbstractRNG, ::Type{Tuple{}}) = tuple()
@inline rand_tuple(::Type{Tuple{}}) = tuple()

@generated function iszero_tuple(tup::NTuple{N,V}) where {N,V}
iszero_tuple(tup::NTuple{N,V}) where {N,V} = _iszero_tuple(unwrap_dual(V), tup)

# default implementation; specific number types (e.g., Interval from IntervalArithmetic)
# can add specializations.
@generated function _iszero_tuple(::Type{V0}, tup::NTuple{N,V}) where {V0,N,V}
ex = Expr(:&&, [:(z == tup[$i]) for i=1:N]...)
return quote
z = zero(V)
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