On 27.02.2009, at 14:46, Mark Volkmann wrote:
> Is it correct to say that each loaded function is represented by an
> AFn object in memory?
Each compiled function becomes a class that extends AFn. When the
function is created in the Clojure code, an object is generated from
this class. If you have a function returning a function (typically a
closure), there is only one class for the returned function, but
there will be several instances of that class.
> Are macros represented in memory in the same way?
Yes. Macros are strictly the same as functions. The only difference
is that the var that stores the reference has a "macro" flag set, so
that the compiler knows to call it correctly.
In fact, you can obtain a plain function version of a macro:
(def and-as-a-function @(var and))
Of course, this is still a function that expects being called with
unevaluated forms and returns a modified form. It's just called
explicitly, rather than implicitly by the compiler.
Konrad.
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