This is a MUCH simpler solution. I'm learning:
package main
// AnnotationKey is used as a map key for particular AMQP maps.
// It holds an interface{} which must be either a Symbol or a uint64
type AnnotationKey struct {
value interface{}
}
type Symbol string
func AnnotationKeySymbol(v Symbol) AnnotationKey { return AnnotationKey{v} }
func AnnotationKeyULong(v uint64) AnnotationKey { return AnnotationKey{v} }
func (ak AnnotationKey) Get() interface{} { return ak.value }
func main() {
k := AnnotationKeySymbol(Symbol("foo"))
println(k.Get().(Symbol))
k = AnnotationKeyULong(42)
println(k.Get().(uint64))
}
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