Christian Froeschlin wrote:

> [GDS|Entropy] wrote:
> 
>> Would one be able to pass signs (+ - / *)
> 
> no

Of course, no one prevents you from passing a function
which performs the operation, whatever your reasons:

   #declare op_add  = function(x,y){x+y}
   #declare op_sub  = function(x,y){x-y}
   #declare op_mult = function(x,y){x*y}
   #declare op_div  = function(x,y){x/y}
   #declare op_avg  = function(x,y){0.5*op_add(x,y)}

   #macro ConcatFunc(OP,F1,F2)
     function {OP(F1(x,y,z),F2(x,y,z))}
   #end

   #declare f_combined = ConcatFunc(op_avg, f_bozo, f_agate)

Just think clearly about what you wish to achieve before doing it ;)

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