Comments (1)
I'm trying to find a situation where this makes a difference. I understand the closure argument, and interestingly enough it's different for division on Integer
vs subtraction on Unsigned
-(::T)::T where T <: Unsigned
, but inv(::Int)::Float64
. But a concrete example where this is happening would help.
julia> 0x00ff + -(0x01)
0x01fe
julia> 0x00ff - 0x01
0x00fe
julia> n(x) = zero(x) - x
n (generic function with 1 method)
julia> n(0x01)
0xff
julia> n(0x0001)
0xffff
I wonder if you looked at something like
julia> struct A <: Number
end
julia> -(A(), A())
ERROR: - not defined for A
Stacktrace:
[1] error(::String, ::String, ::Type{T} where T) at ./error.jl:42
[2] no_op_err(::String, ::Type{T} where T) at ./promotion.jl:383
[3] -(::A, ::A) at ./promotion.jl:386
[4] top-level scope at none:0
and read the error message as implying that there is a fallback on -(::A)
. There isn't, I just think the message is a bit misleading: https://github.com/JuliaLang/julia/blob/04e47cf5ff95daf887808f52b96d79ae03b1942a/base/promotion.jl#L387
from radical-julia.
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