On Tue, Jun 24, 2014 at 2:55 AM, Christian Beaumont via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote: > Just an idea that popped into my head... Maybe I can use variant for the > input/output types? I haven't looked at it yet, so I'm not sure what it > does, or the performance costs.
It imitates you standard variant type from dynamic languages. It sure would make translating Javascript code easier. I don't know its performance cost. I'd say the only way to know is to compare your code with Node.js. > > I realized that because the final callback always gets called, and the types > of the intermediate steps may be different, there is actually no way at all > to define a completely uniformly type safe final callback... Unless you define the final callback to be called only when an exception is passed, as a special error-handling branch. Else the chain would pass through the first function, then the second, up to the Nth-1, and stop there.
