I would go for the vector. It's easier than writing (ordered-map ...) all the time. If you want to generate structs dynamically, you would even simply create a vector of alternating pairs and do (apply ordered-map my-vec).
Btw: Great library! I think I will rewrite my binary-parser from a project of mine to use this library! On Tue, Nov 23, 2010 at 9:24 PM, Zach Tellman <ztell...@gmail.com> wrote: > Good question. The solution didn't make the cut for my initial > release, but will be added soon. My plan is to have an (ordered- > map ...) frame which encodes and decodes the keys in the given order. > So for C interop, the frame would be > > (ordered-map :a :int16, :b :float32) > > An alternative would be to just turn any vector which is alternating > keys and types into an ordered-map, but that seems a bit too magical. > > Zach > > On Nov 23, 12:12 pm, Chris Perkins <chrisperkin...@gmail.com> wrote: > > On Nov 23, 12:03 pm, Zach Tellman <ztell...@gmail.com> wrote: > > > > > > > > > > > > > > > > > > > > > When writing Calx [1], I discovered it was a huge pain to deal with > > > mixed C datatypes in Java. When writing Aleph [2], I discovered the > > > problem increases by a factor of ten when dealing with streams of > > > bytes. In an attempt to alleviate my own pain, and hopefully help a > > > few other people out, I've written Gloss, which can transform a simple > > > byte-format specification into an encoder and streaming decoder. > > > > > A full writeup can be found athttps://github.com/ztellman/gloss/wiki. > > > > > A few people have already asked me how this differs from protocol > > > buffers, so I'll preemptively answer that protocol buffers are a fixed > > > format that cannot be used to interface with external systems. Gloss > > > is less performant than protocol buffers, but is also much less picky > > > about formats. > > > > > If anyone has any questions, I'd be happy to answer them. > > > > Looks very useful, Zach. Thanks. > > > > I have a question. > > > > I have only taken a quick look, so maybe I'm misunderstanding the > > intent, but it's not clear to me how you would use this for sending > > and receiving structured data from, say, a C program. > > > > Taking your example from the wiki: > > > > (def fr (compile-frame {:a :int16, :b :float32})) > > > > Let's say I want to talk to a C program that speaks in structs, like > > this: > > > > struct Foo { short a; float b; } > > > > The problem is, the C program cares about order - the short comes > > before the float. How does the Clojure program know what order I need > > the fields in, since I have specified the format with a map; an > > unordered data structure? Is there another way to specify a structure > > where order of the fields matters? If so, why have two ways of doing > > it? Or am I just missing something? > > > > Thanks, > > > > - Chris > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com<clojure%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > -- Moritz Ulrich Programmer, Student, Almost normal Guy http://www.google.com/profiles/ulrich.moritz BB5F086F-C798-41D5-B742-494C1E9677E8 -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
