I was expecting that since basicNode is anonymously embedded into TestNode and ActionNode, that the methods and fields of basicNode would all be present in TestNode and ActionNode. In that case I'd have expected
https://play.golang.org/p/gIvykcxFTmQ to have worked. That shows that basicNode's inputs and outputs fields are not visible as fields of ActionNode or TestNode though. On Tuesday, May 1, 2018 at 3:58:35 PM UTC-4, alex....@gmail.com wrote: > > Struct embedding works like this: > > type ActionNode struct { > basicNode > } > > Turns into: > > type ActionNode struct { > basicNode basicNode > } > > func (a *ActionNode) OutputsTo(n2 node) { > a.basicNode.OutputsTo(n2) > } > > So basicNode will behave as a field of ActionNode with wrapper functions. > If you must embed and get basicNode out of a interface then you need to > add to your interface a new method to get basicNode, e.g. > https://play.golang.org/p/QhTmqeg9vgU > > On Wednesday, 2 May 2018 03:43:17 UTC+8, Mark Nahabedian wrote: >> >> I don't know why I'm getting this interface conversion error or what to >> do about it. >> >> I define an interface, node, and a struct, basicNode that implements >> behavior common to all nodes. I also define ActionNode and TestNode which >> both anonymously embed basicNode. >> >> basicNode implements OutputsTo which links the receiver with the node >> passed as argument. >> >> I get the runtime error >> >> panic: interface conversion: main.node is *main.ActionNode, not >> *main.basicNode >> >> >> >> >> Here's a playground link that exhibits my problem: >> >> https://play.golang.org/p/ZeIkJSd7qB0 >> >> Thanks. >> >> -- 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.
