> Is there anyway to write a macro/function that acts as a function when
> necessary (so it can be passed as an argument), but expands into a
> macro (for speed) when deemed possible?
I don't think this is possible without some sort of support for a
macro/function duality in core Clojure. In the current implementation
(read: you should not rely on this fact) macros' are simply functions
with the #^{:macro true} metadata attached. Since you can't have a
symbol refer to two different values, I don't see any way to do this
except if you re-bind 'and' in a local context:
(let [and (fn and [x & xs]
(if x (if (nil? xs) true (and xs)) false))]
(apply and [true true false]))
Probably the closest you can come to this without redefining and is
Konrad's suggestion:
#(and %1 %2)
/mike.
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