RoboZZle Forums

I'm thoroughly confused.

(Thought, unlike call/cc, a 'return' block is practical and might be a very interesting addition.)

I was mostly being flip, but no, call/cc is a Scheme-ism, the building block for creating any new flow control construct you might like. In short, call/cc calls takes a procedure as it's only argument and calls it passing a procedure that represents the current continuation as a parameter. The continuation is the entire rest of the computation from where it was captured - invoking it resumes there, with that original stack, etc. It's a bit like setjmp/longjmp, except you can call it more than once, the setjmp might have been captured lower on the stack than the longjmp.

This is the first time that I am hearing about call-with-current-continuation, but I skimmed the Wikipedia page. :-)

So, are you basically suggesting a command corresponding to the "return" statement in a typical programming language?

Seemed a shame for this empty forum to be lurking at the bottom of the page - so, since we are busily creating our own control constructs let me be the first to request a call-with-current-continuation block for some future version.