I have comtom struct: struct Ci pre::Union{Ci,String} next::String end I can add chain method to construct an instance of it: (::Colon)(x::Vararg{String})=begin pre=x[1] for next_ in x[2:end] pre=Ci(pre,next_) end return pre end "a":"b":"c" Ci(Ci("a", "b"), "c") …

[image] Brian1: Maybe it is not a problem of infix operator? You are probably right. I don’t know enough about ::Colon and parser restrictions (.. could clash with the broadcast operator . somehow?), but the following variations seem to work (&)(pre::Union{String,Ci},next_::String)=return Ci…

It do a infix operator well: "a".."b" # Ci("a", "b") while fail to this: "a".."b".."c" Maybe it is not a problem of infix operator?

Does it work with spaces between the operators?

No, it does not. It appears the same error as above.

Note that there is no performance advantage to marking a field with a Union type over Any. It’s nice because it’s a bit selfdocumenting, but if you want it to be more performant you’ll want a parametric type. TIL

That’s incorrect. Small unions of concrete types may still be stored inline. Edit: The reason Ci here can’t be stored inline is due to it’s self-recursive definition. Annotating the type as a union will still allow the compiler to do union splitting, so it’s still better than Any performance-wise.

Add custom chain method

New to Julia

goerch April 17, 2022, 7:22am 2

See this post, which references this post, which contains further references.

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Add custom chain method

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