Method Key

proto/reflect.go:56–56

When the Type represents a protobuf map, calling this method returns the type of the map keys. If the Type is not a map type, the method panics.

()

	//
	// If the Type is not a map type, the method panics.
	Key() Type

	// When the Type represents a protobuf map, calling this method returns the
	// type of the map values.