Thread: Using Function objects to define valid operations on other objects

Consider that I've several objects of a token class...some of them being operands and most others being operators and functions.
How do I implement the ( ) overload , such that, when I call

Code:

random_object(<pointer to operand stack>) ;

..the particular operation takes place?..I thought about placing function pointers but can not do so in a good way..(i.e..which does not involve dozens of switch cases..!)..
Any hint is welcome..

If Token[0] was a number token, and Token[1] was a function token, and Token[2] was another number token, then you would want

Code:

Token[1].fn_object(Token[0], Token[2]);