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Simplify half(Half{T}, x) implementation #34

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Jun 11, 2021
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Simplify half(Half{T}, x) implementation #34

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6 changes: 2 additions & 4 deletions src/HalfIntegers.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -558,14 +558,12 @@ that, e.g., `HalfInt` can be used instead of `Half{Int}`:
"""
struct Half{T<:Integer} <: HalfInteger
twice::T
# Inner constructor that is only used to define half(::Type{Half{T}}, x)
Half{T}(::Val{:inner}, twice) where T<:Integer = new(twice)

global half(::Type{Half{T}}, x::Number) where T<:Integer = new{T}(x)
end
Half{T}(x::Real) where T<:Integer = half(Half{T}, twice(T,x))
Half{T}(x::Half{T}) where T<:Integer = x

half(::Type{Half{T}}, x::Number) where T<:Integer = Half{T}(Val{:inner}(), x)

twice(x::Half) = x.twice

Base.promote_rule(::Type{Half{H}}, T::Type{<:Real}) where H<:Integer = promote_type(Rational{H}, T)
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