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Zero is a real number (Flux.Nil) #1830

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merged 2 commits into from
Feb 5, 2022
Merged

Zero is a real number (Flux.Nil) #1830

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4f1b520
zero is real
mcabbott Jan 12, 2022
22a0b83
leq
mcabbott Jan 13, 2022
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14 changes: 7 additions & 7 deletions src/outputsize.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -4,13 +4,14 @@ using NNlib
import Random

"""
Nil <: Number
nil = Nil()

Nil is a singleton type with a single instance `nil`.
Unlike `Nothing` and `Missing` it subtypes `Number`.
`Nil` is a singleton type with a single instance `nil`.
Unlike `Nothing` and `Missing` it is a number: `Nil <: Real <: Number`.
"""
struct Nil <: Number end
struct Nil <: Real end

@doc @doc(Nil)
const nil = Nil()

Nil(::T) where T<:Number = nil
Expand All @@ -30,9 +31,8 @@ for f in [:+, :-, :*, :/, :^, :mod, :div, :rem]
@eval Base.$f(::Nil, ::Nil) = nil
end

Base.isless(::Nil, ::Nil) = true
Base.isless(::Nil, ::Number) = true
Base.isless(::Number, ::Nil) = true
Base.:<(::Nil, ::Nil) = true
Base.:<=(::Nil, ::Nil) = true

Base.isnan(::Nil) = false
Base.isfinite(::Nil) = true
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