Referential Identity and Internship

I was thinking about a gotcha in Java, and started wondering about the idea of making it convenient to intern reference objects.

Generic Value Object With Yield Return

Inspired by this and this, here’s my version.

Jan Van Ryswyck is right to use static reflection, and to do that he "registers" the properties in a list. On the other hand, assuming you’d have a lot of these objects building up in the GC, it might prove important to reduce the number of ancillary allocations going on, so it may be better to avoid creating a list of the properties in every single instance.

Lazy Sequence Generation without using Yield Return

C# has the yield return feature, which makes it easy to write state machines as if they were plain old methods: