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-- C456001.A

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--*

-- OBJECTIVE:

--     For exponentiation of floating point types, check that

--       Constraint_Error is raised (or, if no exception is raised and

--       Machine_Overflows is False, that a result is produced) if the

--       result is outside of the range of the base type.

--     This tests digits 5.

-- HISTORY:

--     04/30/03  RLB  Created test from old C45622A and C45624A.

with Report;

procedure C456001 is

     type Flt is digits 5;

     F : Flt;

     function Equal_Flt (One, Two : Flt) return Boolean is

         -- Break optimization.

     begin

          return One = Two * Flt (Report.Ident_Int(1));

     end Equal_Flt;

begin

     Report.Test ("C456001", "For exponentiation of floating point types, " &

                      "check that Constraint_Error is raised (or, if " &

                      "if no exception is raised and Machine_Overflows is " &

                      "False, that a result is produced) if the result is " &

                      "outside of the range of the base type.");

     begin

         F := (Flt'Base'Last)**Report.Ident_Int (2);

         if Flt'Machine_Overflows Then

             Report.Failed ("Constraint_Error was not raised for " &

                       "exponentiation");

         else

             -- RM95 3.5.6(7) allows disobeying RM95 4.5(10) if

             -- Machine_Overflows is False.

             Report.Comment ("Constraint_Error was not raised for " &

                       "exponentiation and Machine_Overflows is False");

         end if;

         if not Equal_Flt (F, F) then

             -- Optimization breaker, F must be evaluated.

             Report.Comment ("Don't optimize F");

         end if;

     exception

         when Constraint_Error =>

             Report.Comment ("Constraint_Error was raised for " &

                             "exponentiation");

         when others =>

             Report.Failed ("An exception other than Constraint_Error " &

                            "was raised for exponentiation");

     end;

     Report.Result;

end C456001;