* It is a proof-of-concept implementation to show that porting Postgres over to C++ is feasible with minimal changes. It is not official.

* We need to refactor the increment operator because the variables are of enumeration type.

* We have not yet tested compilation with clang. But, I presume that minimal changes would be required to support compilation with clang. PRs are welcome!

* Not really. Our hope is that the PostgreSQL core team would consider gradually migrating over to C++. I think that this refactoring can be done without breaking external interfaces.

Thanks for the positive feedback.