Hi Kyle, This looks like a very interesting library! When I have a bit of time I may see see if some of my simulation codes are good candidates to make use of your API. For the moment, just a few points from reading the docs: - Under "Lambda Expressions", I am pretty sure that "+ 4" is not the right way to "subtract four" :-) - Like Karsten I am interested in zip iterators - my simulation code uses such structures heavily. - What is the command_queue argument that appears in all of the algorithms? For instance here: http://kylelutz.github.com/compute/boost/compute/copy.html the signature for 'copy' takes four arguments - three iterators and a command_queue - but the example only passes the iterators, and there is no other mention of command_queues. - Under "Vector Data Types", why floats but not doubles? Is this an OpenCL restriction? (sorry for the ignorance - my GPGPU knowledge is mostly on the CUDA side). Also, what header are they declared in? More later, and thanks, -Gabe