[GitHub] [beam] diamondburned commented on issue #21929: [Feature Request]: GoSDK: Generics API for beam

["diamondburned (via GitHub)" <gi...@apache.org>]

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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