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add typemax typemin #444

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Merged
merged 1 commit into from
Jan 24, 2020
Merged

add typemax typemin #444

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10 changes: 9 additions & 1 deletion src/dual.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,7 @@ end
if S ≺ T
d
else
throw(DualMismatchError(T,S))
throw(DualMismatchError(T,S))
end
end

Expand Down Expand Up @@ -612,3 +612,11 @@ function Base.show(io::IO, d::Dual{T,V,N}) where {T,V,N}
end
print(io, ")")
end

function Base.typemin(::Type{ForwardDiff.Dual{T,V,N}}) where {T,V,N}
ForwardDiff.Dual{T,V,N}(typemin(V))
end

function Base.typemax(::Type{ForwardDiff.Dual{T,V,N}}) where {T,V,N}
ForwardDiff.Dual{T,V,N}(typemax(V))
end
11 changes: 11 additions & 0 deletions test/DualTest.jl
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Expand Up @@ -476,4 +476,15 @@ end
@test pow(x1, 0) === x1^0 === Dual{:t1}(1.0, 0.0)
end

@testset "Type min/max" begin
d1 = Dual(1.0)
dinf = typemax(typeof(d1))
dminf = typemin(typeof(d1))
@test dminf < d1 < dinf
@test typeof(dminf) === typeof(d1)
@test typeof(dinf) === typeof(d1)
@test !isfinite(dminf)
@test !isfinite(dinf)
end

end # module