http://people.debian.org/~aaronl/Usenix88-lexic.pdf http://people.debian.org/~aaronl/Usenix88-lexic.pdf ddescribes non-escaping lexical closures for C++. With

http://people.debian.org/~aaronl/Usenix88-lexic.pdf http://people.debian.org/~aaronl/Usenix88-lexic.pdf ddescribes non-escaping lexical closures for C++. With a bit of work (automated clone-env-on-escape, for example) you can have efficient closures that don't totally suck.