PS kudos for including a go.mod file in that demo code! On 12 March 2018 at 19:15, roger peppe <rogpe...@gmail.com> wrote: > On 12 March 2018 at 17:53, Maverick Woo <maverick....@gmail.com> wrote: >> Hi, >> >> I am exploring a pattern to achieve a desirable aspect of vtable in Go. For >> now please put the vtable consideration aside, and see an example I have put >> together for this post: >> >> https://play.golang.org/p/ctkwGuYGqiy >> >> In the example, there is a "typo" in the spelling of a method name ("Buuuug" >> instead of "Bug"), and that typo caused the generate code to exhibit an >> infinite recursion in method lookup. >> >> This infinite recursion looks reasonable to me and I consider the Go >> compiler & runtime to be doing the right thing here. My question is: is >> there a way to *statically* catch this typo, in the same spirit as the >> ineffective attempt at the end of the playground example (a "var _ type >> assertion")? > > This is an interesting edge case that you've run across, and I've done > similar things in the past but I don't buy your motivational example. > Putting an embedded recursive reference to a value within the value > itself seems to be asking for trouble to me. > > Go emphasises "has-a" relationships over "is-a" relationships, and > ISTM that you're trying hard for the latter when the former provides a > straightforward path to doing what you want. > > For example: https://play.golang.org/p/b2J05LxzGpT (stripped down to a > single file so that it works in the Go playground). > > Specifically, by changing the Print function to a function from a > method, we allow it to run on any value that implements the Shape > interface without being a method on Shape itself. That is, Print *has > a* Shape, rather than being part of a Shape. > > Does that not work for you? > > cheers, > rog.
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