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Re: Controlling evaluation


Yaroslav Bulatov wrote:
> 
> My own question for the group -- what is the recommended way to define
> a function only for arguments with HoldAll head (like Hold, Condition,
> etc)?
> 

The obvious solution is

fun[completeArg : (head_[___])] /;
   MemberQ[Attributes[head], HoldAll] := something
    (* do something with completeArg *)

But most probably you already know about this solution.  I do not know 
if there are better or more compact ways to do it.

-- 
Szabolcs


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