Thank you very much, Tassilo! Are Graph and Vertex classes from the public API?
On 24 ноя, 13:02, Tassilo Horn <tass...@member.fsf.org> wrote: > ru <soro...@oogis.ru> writes: > > Can anybody point out good (idiomatic) examples of using protocols for > > extending functionality of existing classes? > > Here's one that I have in my code: > > --8<---------------cut here---------------start------------->8--- > (defprotocol VSeq > "Protocol for types supporting vseq." > (vseq-internal [this tm] > "Returns a lazy seq of the graph's vertices restricted by type > matcher `tm', or the vertices following this vertex.")) > > (extend-protocol VSeq > Graph > (vseq-internal > [g tm] > (lazy-seq > (let [f (first-vertex g tm)] > (and f (cons f (vseq-internal f tm)))))) > Vertex > (vseq-internal > [v tm] > (lazy-seq > (let [n (next-vertex v tm)] > (and n (cons n (vseq-internal n tm))))))) > --8<---------------cut here---------------end--------------->8--- > > Graph and Vertex are existing Java classes. > > Bye, > Tassilo > -- > (What the world needs (I think) is not > (a Lisp (with fewer parentheses)) > but (an English (with more.))) > Brian Hayes,http://tinyurl.com/3y9l2kf -- 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
