diamondburned commented on issue #21929:
URL: https://github.com/apache/beam/issues/21929#issuecomment-1639070206
To slightly contribute to the wrapper library, this function adds a bit more
runtime type safety for converting `beam.PCollection`s:
```go
// CollectionOf returns a typed PCollection converted from the given
// beam.PCollection. It exists for documenting purposes. If T doesn't match
// with what is actually in pc, the function panics.
func CollectionOf[T any](pc beam.PCollection) PCollection[T] {
var z T
if reflect.TypeOf(z) != pc.Type().Type() {
panic(fmt.Sprintf(
"CollectionOf given unexpected PCollection type:
expected %v, got %v",
reflect.TypeOf(z), pc.Type().Type()))
}
return PCollection[T](pc)
}
```
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