multidispatch | 易学教程

python - lost self while decorating class multimethods

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问题 I am trying to implement a multimethod approach based on this article http://www.artima.com/weblogs/viewpost.jsp?thread=101605. There are two differences from this approach: I only need to look at the first argument of the multimethod, so no need to form tuples of arg classes The multimethods will live in classes, they will not be regular functions. However I mixed up my classes a bit, and the call to self gets lost while dispatching a call to a class method. Here is my code: method_registry

python - lost self while decorating class multimethods

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Emulating multiple dispatch in S3 (for 3 signature arguments)

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问题 I'm aware of the general ins and outs of the different OO systems in R and I'm all for staying in S3 whenever/as long as I can. However, the need for multiple dispatch keeps haunting me in professional projects and kept pulling me into S4 in the past. But I refuse to accept that I can't find a S3 emulation of multi dispatch à la S4 that is at least able to support my primary use case of avoiding unsystematic data drift: My analytical programs create data structures that I publish to

How does Perl 6's multi dispatch decide which routine to use?

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问题 Consider this program where I construct an Array in the argument list. Although there's a signature that accepts an Array, this calls the one that accepts a List: foo( [ 1, 2, 3 ] ); multi foo ( Array @array ) { put "Called Array @ version" } multi foo ( Array $array ) { put "Called Array \$ version" } multi foo ( List $list ) { put "Called List version" } multi foo ( Range $range ) { put "Called Range version" } I get the output from an unexpected routine: Called Array $ version If I

How does Perl 6's multi dispatch decide which routine to use?

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Consider this program where I construct an Array in the argument list. Although there's a signature that accepts an Array, this calls the one that accepts a List: foo( [ 1, 2, 3 ] ); multi foo ( Array @array ) { put "Called Array @ version" } multi foo ( Array $array ) { put "Called Array \$ version" } multi foo ( List $list ) { put "Called List version" } multi foo ( Range $range ) { put "Called Range version" } I get the output from an unexpected routine: Called Array $ version If I uncomment that other signature, that one is called: Called List version Why doesn't it call the ( Array @array