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Support one and oneunit #59

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Dec 1, 2017
Merged

Support one and oneunit #59

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d891c72
Support one and oneunit
omus Nov 29, 2017
6477256
Handle StackOverflow error with Any
omus Nov 29, 2017
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Handle StackOverflow error with Any
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@omus
omus committed Nov 29, 2017
commit 6477256b12c95d956c7717f3896e3c4a43b49527
9 changes: 6 additions & 3 deletions src/Missings.jl
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Expand Up @@ -95,9 +95,12 @@ for f in (:(!), :(+), :(-), :(Base.identity), :(Base.zero), :(Base.one), :(Base.
@eval $(f)(d::Missing) = missing
end

Base.zero(::Type{Union{T, Missing}}) where T = zero(T)
Base.one(::Type{Union{T, Missing}}) where T = one(T)
Base.oneunit(::Type{Union{T, Missing}}) where T = oneunit(T)
for f in (:(Base.zero), :(Base.one), :(Base.oneunit))
@eval function $(f)(::Type{Union{T, Missing}}) where T
T === Any && throw(MethodError($f, (Any,)))
$f(T)
end
end

# Binary operators/functions
for f in (:(+), :(-), :(*), :(/), :(^),
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5 changes: 5 additions & 0 deletions test/runtests.jl
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Expand Up @@ -68,6 +68,11 @@ using Base.Test, Missings, Compat
@test oneunit(Union{T, Missing}) === T(1)
end

# Make sure we didn't introduce a StackOverflow error
@test_throws MethodError zero(Any)
@test_throws MethodError one(Any)
@test_throws MethodError oneunit(Any)

# Comparison operators
@test (missing == missing) === missing
@test (1 == missing) === missing
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