On Oct 3, 2013, at 6:06 PM, Kyle Sluder <k...@ksluder.com> wrote:

> Other people have addressed the dispatch_get_current_queue() problem.
> Andy Matuschak has opined that the correct way to design an API that
> accepts a block argument is to also accept a dispatch queue on which to
> run that block.

The problem I see with queue arguments is that there are two types of queues 
that people might be using — dispatch_queue_t and NSOperationQueue — and there 
doesn't seem to be a way to convert one into the other. So if you design your 
API to take an NSOperationQueue argument and your caller is using dispatch 
queues, or vice-versa, then your caller is up a creek, unless you go to the 
trouble to create two versions of each API, one for each type of queue.

Charles

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