Add isinteger

Author: dlfivefifty

Project.toml

@@ -1,6 +1,6 @@
 name = "DualNumbers"
 uuid = "fa6b7ba4-c1ee-5f82-b5fc-ecf0adba8f74"
-version = "0.6.9"
+version = "0.6.10"
 
 [deps]
 Calculus = "49dc2e85-a5d0-5ad3-a950-438e2897f1b9"

src/dual.jl

@@ -182,6 +182,8 @@ Base.isless(z::Dual{<:Real},w::Dual{<:Real}) = value(z) < value(w)
 Base.isless(z::Real,w::Dual{<:Real}) = z < value(w)
 Base.isless(z::Dual{<:Real},w::Real) = value(z) < w
 
+Base.isinteger(z::Dual) = isinteger(value(z)) # Ignore epsilon part to be consistent with ==
+
 Base.hash(z::Dual) = (x = hash(value(z)); epsilon(z)==0 ? x : bitmix(x,hash(epsilon(z))))
 
 Base.float(z::Union{Dual{T}, Dual{Complex{T}}}) where {T<:AbstractFloat} = z

test/automatic_differentiation_test.jl

@@ -243,3 +243,6 @@ end
 @test epsilon(44.0) ≈ 0.0
 
 @test_throws InexactError convert(Float64, Dual(1,1))
+
+@test isinteger(Dual(2, 0.01))
+@test !isinteger(Dual(2.1, 0.01))