接口 HolderGetter<T>

所有已知子接口:
HolderLookup<T>, HolderLookup.RegistryLookup<T>
所有已知实现类:
HolderLookup.Delegate, HolderLookup.RegistryLookup.Delegate, RegistrySetBuilder.EmptyTagLookup, RegistrySetBuilder.UniversalLookup

public interface HolderGetter<T>