I'm not sure without knowing *how* you want to use []*Shape{}. Perhaps you
want Shape to be an interface?
type Shape interface {
DrawMe()
}
type BoxShape struct ...
func (*BoxShape) DrawMe() { }
type LineShape struct ...
func (*LineShape) DrawMe() { }
shapes := []Shape{}
(Note that interfaces internally carry pointers, so you don't generally
want to have pointers to interface types)
On Thursday, 17 August 2023 at 13:44:10 UTC+1 Mark wrote:
> Here's something that works but uses `any` which is too broad in scope:
> ```go
> type Shape any // Want to constrain to BoxShape and LineShape only
>
> type BaseShape struct {
> X int
> Y int
> PenColor color
> PenWidth int
> FillColor color
> }
>
> type BoxShape struct {
> BaseShape
> Width int
> Height int
> }
>
> type LineShape struct {
> BaseShape
> X2 int
> Y2 int
> }
>
> shapes := []*Shape{}
> ```
> Is there a nice way to create a `Shape` type which will allow me to do
> `shapes := []*Shape{}` and that _also_ constrains the shapes to `BoxShape`
> and `LineShape`?
>
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