23 lines
901 B
Julia
23 lines
901 B
Julia
# This file is a part of Julia. License is MIT: https://julialang.org/license
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## numeric/object traits
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# trait for objects that have an ordering
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abstract type TypeOrder end
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struct HasOrder <: TypeOrder end
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struct Unordered <: TypeOrder end
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TypeOrder(instance) = TypeOrder(typeof(instance))
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TypeOrder(::Type{<:Real}) = HasOrder()
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TypeOrder(::Type{<:Any}) = Unordered()
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# trait for objects that support arithmetic
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abstract type TypeArithmetic end
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struct ArithmeticRounds <: TypeArithmetic end # least significant bits can be lost
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struct ArithmeticOverflows <: TypeArithmetic end # most significant bits can be lost
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struct ArithmeticUnknown <: TypeArithmetic end
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TypeArithmetic(instance) = TypeArithmetic(typeof(instance))
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TypeArithmetic(::Type{<:AbstractFloat}) = ArithmeticRounds()
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TypeArithmetic(::Type{<:Integer}) = ArithmeticOverflows()
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TypeArithmetic(::Type{<:Any}) = ArithmeticUnknown()
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