Using a string as a binary operator

[Joe <joesmoe10@gmail.com>]

Hey all,

I'm trying to build a simple stack the evaluates expressions in
postfix notation (i.e. "1 2 +").  I can't find a way to use the
operator directly when I get to it.  When I get to the  "+", but how
do I apply this string to 1 and 2?  The best I can do is make a case
statement that has a case for each binary operator, but this seems
very klunky.  I know you can write "+"(1,2) to return 3 but how do I
get Ada to recognize the string as an operator?  Here's a short
example of what I would like to do:

with Ada.Integer_Text_IO;  use Ada.Integer_Text_IO;
procedure Operators is
   Plus : String := "+";
begin
   Put( Plus(1,2));
end Operators;

Thanks,
Joe