Hi!
In short:
I have noticed that in most cases I use macros only for lazy arguments
evaluation. Why not to make something to use only this feature? It would be
light version of macro for clojurescript/clojure and easy to grasp for
newcomers and still powerful in programming (with that you could implement
binding/scopes/interpreter pattern). I love implicite use of macros where
from call point of view the user can't distinguish what is function and
what is macro.
In long:
Generally the macros are used in compile phase to manipulate AST (or just
data structures because Clojure is homoiconic) to produce code in order to
be consumed in evaluation phase.
It is nice to include new language constructs with use of macros but as my
experience points out for most time I use macros only for changing
evaluation moment/order.
Maybe there should be some construct like "defnlazy" for which you write
normal function but all input arguments are evaluated only when you
explicitly evaluate them.
What we gain? We don't have to deal with # ` @ list eval and separate
thoughts on read/eval phases, but we still must explicitly say ~ to deref
passed block of construct as argument.
Also there are some problems to grasp:
- is it safe to implicite convert blocks of construct from statements to
deref objects
- how it should behave when you pass not deref object to another discussed
"defnlazy"
- maybe there shouldn't be any defnlazy but you should just implement it in
arguments destruction so you can use constructs like:
(defn mycrazyif [ statement ~onsuccess ~onfailure ]
(if statement ; just evalutated with mycrazyif call
@onsucess ; deref block in case of success
@onfailure)) ; deref block in case of failure
With regards,
Olek
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