you can check for the existence of the protocol's var just like you would for any var. not sure what B. Ghose is getting at, but I would recommend not checking for the existence of the interface.
http://clojure.org/vars On Wed, Oct 24, 2012 at 12:23 PM, Baishampayan Ghose <[email protected]> wrote: > What about the technique Clojure uses in the reducers library? > > https://github.com/clojure/clojure/blob/master/src/clj/clojure/core/reducers.clj#L37 > > -BG > > On Wed, Oct 24, 2012 at 12:20 PM, Michael Klishin > <[email protected]> wrote: >> Is there a way to check if a protocol exists? >> >> For example, if I want to extend clojure.data.json protocols but only if it >> is available, how would I go about it? >> >> This way does not work at least some of the time (referenced namespace >> causes a ClassNotFound exception >> during compilation): >> >> https://github.com/clojurewerkz/support/blob/master/src/clojure/clojurewerkz/support/json.clj#L18-33 >> >> Any better solutions? I'd like to avoid adding any new dependencies, if >> possible. >> >> Thank you in advance. >> -- >> MK >> >> http://github.com/michaelklishin >> http://twitter.com/michaelklishin >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to [email protected] >> Note that posts from new members are moderated - please be patient with your >> first post. >> To unsubscribe from this group, send email to >> [email protected] >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en > > > > -- > Baishampayan Ghose > b.ghose at gmail.com > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- And what is good, Phaedrus, And what is not good— Need we ask anyone to tell us these things? -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en
