Isstructtype()

General Usage
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1

Is it possible to do something like

function my_func(  x::I  )  where isstructtype(I)

    #function body
    
end
2

WhereTraits.jl supports that.

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3

note that if you’re coming from Matlab (which I’m willing to bet you are), this won’t do what you want. instead you want to leave this untyped.

4

Thanks Jar.
Thinking of suggesting this for use in a couple of packages.

For example NamedTupleTools.jl has a specific function ntfromstruct() for converting structs.
With the below line added. The user could instead use the generic NamedTuple function.

@traits NamedTuple( x ) where isstructtype(typeof(x)) = ntfromstruct( x )

Similarly, the Dictionary() function in Dictionaries.jl converts many different types of input (but not currently structs). The below line would allow it to do so.

@traits Dictionary( x ) where isstructtype(typeof(x)) = Dictionary( ntfromstruct( x ))

@Oscar_Smith
I’m not a matlab user. Not sure if this affects your advice.

5

Out of curiosity, what kinds of objects would be permitted to dispatch through this? We don’t have limits on dispatch through functions.

6

Bit of a warning, a lot of unexpected types are isstructtype.

1 Like