Is it possible to invoke a Method? Ie suppose I picked one from the MethodList returned by methods, and I want to invoke that particular method with given arguments. Eg m=which((+),(Int,Int)) # now how to call m with (1,2)? I tried simply calling it as m(1,2), but apparently Method is not callable…

I think the answer then is: “not really”. Maybe this hack works for you: julia> stripT(T) = Tuple{T.parameters[2:end]...} julia> invoke(getfield(m.module, m.name), stripT(m.sig), 1,4) 5

how do I use that? julia> invoke(which((+),Tuple{Int,Int}),1,2) ERROR: TypeError: Method: in invoke, expected Type{T}, got Int64 the help for invoke suggests that I could omit the type sig, but I could not make it work even with that: julia> invoke(which((+),Tuple{Int,Int}),(Any,Any),1,2) ERROR: …

Call invoke on the function, not the method: invoke(+, Tuple{Int,Int}, 1,2)

@mauro3 : I am aware of this, I was just asking how @kristoffer.carlsson proposed to do use it. So now we are back to square 1 - see the original question above.

Ok, I missunderstood your question then.

I’ve proposed a number of times making methods more first class – being able to directly call invoke on a method object would be a significant part of that. If you’re feeling like making a PR to Julia, this would be a good one. If not, you could open an issue requesting such a feature.

@StefanKarpinski @jameson Thanks for the pointers. While I don’t doubt that first-class methods would be useful in some applications, in my particular use case I decided that they would be a very convoluted and unidiomatic solution. What I wanted to do is basically the following: have a DataFrame-l…

has something happened around invoking a method in the meanwhile? maybe with julia 1.0? when having a method object, it would really be awesome if one could just call it

I’ve recently run into this myself, and I thought I’d mention a hacky workaround that I’m currently contemplating. function (m::Method)(args...) fntype, argtypes... = m.sig.types invoke(fntype.instance, Tuple{argtypes...}, args...) end How inferrable is this? Not at all :sweat_smile:

Invoke a method

General Usage

jameson January 4, 2017, 6:48pm 9

See also Proposal for a first-class dispatch wrapper for a related proposal.

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Invoke a method

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