Okay well the actual (working version) of the code (before I wrote the test cases that are currently failing/not compiling) is here (I refuse to check in broken code): https://github.com/cbehopkins/permutation/blob/master/helpers.go
The source library (permutation) can cope with permutes on arrays of arbitrary type as long as you supply a Less function. I'm trying to extend the test cases so anything other than int type is tested. I've long preached that is you're using reflect you're probably doing it. I know the source library uses reflect for these things, I'm trying to avoid it. I just can't see a different way to do it. Thanks Chris On Wednesday, 31 January 2018 17:46:51 UTC, Axel Wagner wrote: > > FTR, you can also pass an actual []Usable, instead of a []tmpType. That is > do > https://play.golang.org/p/N_CJh0Ekik8 > But I do think that your code and question suggest that you are trying to > use interfaces to do some sort of subtyping, which is just not how they are > supposed to be used. > > On Wed, Jan 31, 2018 at 6:43 PM, Axel Wagner <axel.wa...@googlemail.com > <javascript:>> wrote: > >> You have to use reflection for that. Go doesn't have subtyping of that >> kind. This smells a bit of an xy-problem <http://xyproblem.info/> to me, >> though. There are several things here, that suggest an antipattern going >> on. With a little bit of context on the actual problem you are trying to >> solve, we might be able to come up with a more idiomatic design. >> >> On Wed, Jan 31, 2018 at 6:37 PM, Chris Hopkins <cbeho...@gmail.com >> <javascript:>> wrote: >> >>> Hi >>> Sharing my ignorance: >>> I didn't realise that although you can switch-case on an interface, an >>> array of interfaces doesn't work. >>> https://play.golang.org/p/tD8msjCXyuZ >>> >>> Any ideas on how to cope with this? I tried: >>> _, ok = tmp.([]Useable) >>> >>> But that fails for the same reason. I can't work out how to detect if >>> the type (of the empty interface) is an array of a type that satisfies the >>> (useful) interface. >>> This must be a common problem and PEBKAC surely? >>> >>> Regards >>> >>> Chris >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "golang-nuts" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to golang-nuts...@googlegroups.com <javascript:>. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
