> On Sat, Dec 19, 2009 at 3:58 PM, Stuart Halloway
> <[email protected]> wrote:
>> In Clojure it is idiomatic to have optional args at the front of the
>> signature. This makes it easy to define convenient caller APIs, but
>> it
>> leads to bulky let forms like this one (from clojure.core/defmulti)
There's clojure.contrib.def/name-with-attributes for the frequent case
of a def-ing macro that takes an optional docstring and/or attribute
map:
(defn name-with-attributes
"To be used in macro definitions.
Handles optional docstrings and attribute maps for a name to be
defined
in a list of macro arguments. If the first macro argument is a
string,
it is added as a docstring to name and removed from the macro
argument
list. If afterwards the first macro argument is a map, its entries
are
added to the name's metadata map and the map is removed from the
macro argument list. The return value is a vector containing the
name
with its extended metadata map and the list of unprocessed macro
arguments."
[name macro-args]
...)
Konrad.
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