c456001.a

用于进行gcc测试

-- 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;