Structmaps can be defined either named, thru the defstruct macro, or anonymously, thru the create-struct function call. Record types must be named and defined thru a call to defrecord.
This seems to contradict one of the Clojure library coding standards (http://dev.clojure.org/display/design/Library+Coding+Standards): "Don't use a macro when a function can do the job. If a macro is important for ease-of-use, expose the function version as well." My particular problem is the following: I read a set of data, say from a CSV file with column headers. I produce a representation of the data as a sequence of cases where each case is a a collection of annotated key-value pairs. The annotation describes the possible values that can be associated with a given key, and is usually determined by introspection on the values that I just read. The annotation is used to determine details of how certain machine learning methods can be applied to that data. I want the case representation to be as compact and speedy as possible. The number of cases x number of keys may exceed 10^9, so I don't want to repeat the actual keys and annotation with each case, and so using bare maps seems unlikely to be a good solution. So it looks like the choice is between struct-maps and records. Many of the values are likely to be byte, short, etc., and it will be important to save space with an un-boxed representation. It seem record plus type hints would be the best choice. I can work around the missing function, by writing my own macro that calls eval, but that doesn't smell nice. (PS: 'create-struct' is an unfortunately confusing name. It sounds more like instantiation of an existing structure definition than a new definition. I'd suggest 'define-record' or 'create-record-definition' for the function equivalent of 'defrecord'.) -- 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
