Re: Computer Language Shootout

[mheaney@on2.com (Matthew Heaney)]

mheaney@on2.com (Matthew Heaney) wrote in message news:<1ec946d1.0307111358.fb772@posting.google.com>...
> > The Ada 95 entries have appeared that the new
> >  "Computer Language Shootout" website:
> > 
> >    http://dada.perl.it/shootout/gnat.html
> 
> I just cobbled together the "hash table (associative array)" example
> using the hashed set in Charles.  Here it is:

Here's the "hash2" shootout problem, coded using the hashed map in
Charles:

procedure Test_Hash is

   M1, M2 : String_Integer_Maps.Container_Type;

   N : Positive;
   
   type Element_Access is access all
String_Integer_Maps.Element_Subtype;
   for Element_Access'Storage_Size use 0;
   
   function To_Access is new Generic_Element (Element_Access);
   
begin

   if Ada.Command_Line.Argument_Count = 0 then
      N := 1;
   else
      declare
         Last : Natural;
      begin
         Get (Ada.Command_Line.Argument (1), N, Last);
      end;
   end if;      

   Resize (M1, 10000);
   
   for I in Integer range 0 .. 9999 loop
      Insert (M1, "foo_" & To_Key (I, Base => 10), I);
   end loop;
   
   Put ("m1[foo_1]=");
   Put (Element (Find (M1, "foo_1")), Width => 0);
   New_Line;
   
   Put ("m1[foo_9999]=");
   Put (Element (Find (M1, "foo_9999")), Width => 0);
   New_Line;

   Resize (M2, Length (M1));
   
   for I in Integer range 1 .. N loop
      declare
         I1 : Iterator_Type := First (M1);
         J1 : constant Iterator_Type := Back (M1);
         
         I2 : Iterator_Type;
         B : Boolean;
      begin
         while I1 /= J1 loop
            Insert (M2, Key (I1), 0, I2, B);

            declare
               E : Element_Subtype renames To_Access (I2).all;
            begin
               E := E + Element (I1);
            end;
            
            I1 := Succ (I1);
         end loop;
      end;
   end loop;
                   
   Put ("m2[foo_1]=");
   Put (Element (Find (M2, "foo_1")), Width => 0);
   New_Line;
   
   Put ("m2[foo_9999]=");
   Put (Element (Find (M2, "foo_9999")), Width => 0);
   New_Line;

end Test_Hash;


I don't imagine that any of the shootout examples would be difficult
to implement in Ada95, or any less efficient.

http://home.earthlink.net/~matthewjheaney/charles/index.html

-Matt