Okay, I just found a negative answer to this on SO: http://stackoverflow.com/questions/1056061/adding-metadata-to-a-lazy-sequence
However, to give a bit more context for my concrete use case: I'm building a Turtle (RDF) parser which emits a lazy seq of triples, basically a seq of 3-element vectors where the first 2 are URIs. In Turtle these URIs can be abbreviated using namespace prefixes declared at the beginning of the file, e.g given this TTL chunk: @prefix ex: <http://example.org/ns#> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix doap: <http://usefulinc.com/ns/doap#> . ex:clojure rdf:type doap:Project ; doap:name "Clojure" . results in this seq of 2 triples: (["http://example.org/ns#clojure"; "http://www.w3.org/1999/02/22-rdf-syntax-ns#type"; "http://usefulinc.com/ns/doap#Project";] ["http://example.org/ns#clojure"; "http://usefulinc.com/ns/doap#name"; "Clojure"]) Sinc the prefix map is built iteratively as part of the parsing I was hoping to attach it as meta data to the returned lazy-seq, since I can't see any other way of returning this map apart from attaching to every single triple in the seq (which seems like overkill). Are there any other options I'm missing here? On 12 July 2013 14:42, Karsten Schmidt <i...@toxi.co.uk> wrote: > Hello, what is the correct way (assuming there is one) to create a lazy-seq > with metadata attached? The below works for short seqs, but causes a stack > overflow for large ones, which obviously means the lazy-seq mechanism is > altered/broken if wrapped with `with-meta`. So I guess there must be another > way... > > (defn meta-test > [i] > (with-meta > (lazy-seq > (when (pos? i) (cons i (meta-test (dec i))))) > {:range i})) > > (meta (meta-test 100)) > ; => {:range 100} > > Thanks for any insights! > K. -- Karsten Schmidt http://postspectacular.com | http://toxiclibs.org | http://toxi.co.uk -- -- 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 --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
