See https://github.com/golang/go/issues/45380 for a proposal for a language
feature that would allow this. In the meantime, you can convert to any, and
type switch on that:
func Foo[T allowedTypes](arg T) {
switch t := any(arg).(type) {
case int64:
...
On Fri, 12 Aug 2022, 00:40 'Matt Rosencrantz' via golang-nuts, <
golang-nuts@googlegroups.com> wrote:
> I'd really love to be able to do:
>
> type allowedTypes{
> int64|float64|string
> }
>
> func Foo[T allowedTypes](arg T) {
> switch t := arg {
> case int64:
> // something
> case string:
> // something completely different
> }
> }
>
> As a way of having the type checker disallow other types from being passed
> so I don't have to return an error for incorrect types. I guess this would
> be the same as asking for typesets to be allowed in normal interfaces like:
>
> func Foo(arg allowedTypes) {...}
>
> Is there another way to achieve this? Is there a reason it is not possible?
> Thanks!
> Matt
>
>
>
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