Hi All, Complete Julia newbie here. I thought I roughly understood the idea behind the promote_rule and convert stuff (after looking at the docs and a few articles) but I don’t understand the following abstract type A end struct A1 <: A val1::Float64 end struct A2 <: A val2::Float64 end promote_ru…

[image] djbarker: promote_rule(::Type{A1}, ::Type{A2}) = A1 do: Base.promote_rule(::Type{A1}, ::Type{A2}) = A1 Then julia> promote_type(A1, A2) A1

Type promotion clarification

pbayer October 27, 2020, 9:17pm 2

do: Base.promote_rule(::Type{A1}, ::Type{A2}) = A1

Then

julia> promote_type(A1, A2)
A1

1 Like

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