HI, I have a question about defining enum. I noticed that enum member’s name cannot be reused in different enum, example as shown below: julia> @enum FRUIT apple orange julia> @enum COLOR red blue yellow orange ERROR: invalid redefinition of constant orange Stacktrace: [1] top-level scope at non…

[image] ziong: is it an expected behaviour? Yes, that’s the way enums work. [image] ziong: I think orange::COLOR and orange::FRUIT should be both valid. Generally, x::T and x::S cannot happen unless either T <: S or S <: T.

Check out Encapsulating enum access via dot syntax - #4 by quinnj for a workaround (don’t miss the note at the bottom about Julia 1.0).

I rather wish we’d not shipped @enum in its current form in Julia 1.0—it’s really not great. Oh well. Better enum design is on my personal Julia 2.0 list.

The thing is that you want MyEnum.name to be the enum value named name and you want MyEnum to be the type as well. There’s also the tension between using symbols for this kind of thing versus enums. It rather seems that one wants an enum to be a limited kind of Symbol type with automatic domain chec…

[image] StefanKarpinski: The thing is that you want MyEnum.name to be the enum value named name and you want MyEnum to be the type as well. Feature request: getproperty on enum type to access instances · Issue #31166 · JuliaLang/julia · GitHub talks about overloading getproperty for Type{<:En…

[image] StefanKarpinski: There’s also the tension between using symbols for this kind of thing versus enums. It rather seems that one wants an enum to be a limited kind of Symbol type with automatic domain checking and conversion to and from integer values for C interop. We came to the conclu…

Cannot reuse enum member in different enum

New to Julia

tkoolen March 2, 2019, 7:21pm 5

I often just create a tiny module containing only the enum, like Encapsulating enum access via dot syntax - #2 by mbauman.

Topic		Replies	Views
Enum tag collision General Usage question , enum	2	484	August 8, 2018
Adding members to an existing Enum General Usage enum	5	445	January 19, 2024
Encapsulating enum access via dot syntax General Usage enum	13	4879	August 31, 2021
ANN: EnumX.jl -- improved enums for Julia Package Announcements enum	11	3546	November 5, 2023
Solving the drawbacks of @enum New to Julia enum	15	4985	June 23, 2023

Cannot reuse enum member in different enum

Related topics