| -- C3A0010.A |
| -- |
| -- Grant of Unlimited Rights |
| -- |
| -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687, |
| -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained |
| -- unlimited rights in the software and documentation contained herein. |
| -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making |
| -- this public release, the Government intends to confer upon all |
| -- recipients unlimited rights equal to those held by the Government. |
| -- These rights include rights to use, duplicate, release or disclose the |
| -- released technical data and computer software in whole or in part, in |
| -- any manner and for any purpose whatsoever, and to have or permit others |
| -- to do so. |
| -- |
| -- DISCLAIMER |
| -- |
| -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR |
| -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED |
| -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE |
| -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE |
| -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A |
| -- PARTICULAR PURPOSE OF SAID MATERIAL. |
| --* |
| -- |
| -- OBJECTIVE: |
| -- Check that an access-to-subprogram type in a generic instance may be |
| -- used to declare access-to-subprogram objects which invoke subprograms |
| -- in the instance. |
| -- |
| -- TEST DESCRIPTION: |
| -- Declare a numeric type in the visible part of a generic package. |
| -- Declare two different math procedures that can be referred to by |
| -- the access to procedure type. |
| -- |
| -- In the main program, instantiate the generic. Declare an access |
| -- to procedure type. Call each procedure indirectly by dereferencing |
| -- the access value. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- 05 APR 96 SAIC Header correction for 2.1 |
| -- |
| --! |
| |
| generic |
| type Real_Num is digits <>; |
| |
| package C3A0010_0 is |
| |
| -- Type accesses to any math procedure |
| type Math_Procedure_Ptr is access procedure |
| (First_Num, Second_Num : in Real_Num; |
| Result_Num : out Real_Num); |
| |
| procedure Add (First_Num, Second_Num : in Real_Num; |
| Result_Num : out Real_Num); |
| |
| procedure Subtract (First_Num, Second_Num : in Real_Num; |
| Result_Num : out Real_Num); |
| |
| end C3A0010_0; |
| |
| |
| ----------------------------------------------------------------------------- |
| |
| |
| package body C3A0010_0 is |
| |
| procedure Add (First_Num, Second_Num : in Real_Num; |
| Result_Num : out Real_Num) is |
| begin |
| Result_Num := First_Num + Second_Num; |
| end Add; |
| |
| |
| procedure Subtract (First_Num, Second_Num : in Real_Num; |
| Result_Num : out Real_Num) is |
| begin |
| Result_Num := First_Num - Second_Num; |
| end Subtract; |
| |
| end C3A0010_0; |
| |
| ----------------------------------------------------------------------------- |
| |
| with Report; |
| with C3A0010_0; |
| |
| procedure C3A0010 is |
| |
| type Real is digits 2; |
| |
| subtype Math_Float is Real range -10.0 .. 10.0; |
| |
| package Math_Pk is new C3A0010_0 (Real_Num => Math_Float); |
| |
| Math_Access : Math_Pk.Math_Procedure_Ptr; |
| |
| Total_Num : Math_Float := 0.0; |
| First_Num : Math_Float := 1.0; |
| Second_Num : Math_Float := 2.0; |
| |
| procedure Max( A_Num, B_Num: in Math_Float; Result : out Math_Float ) is |
| begin |
| if A_Num > B_Num then |
| Result := A_Num; |
| else |
| Result := B_Num; |
| end if; |
| end Max; |
| |
| procedure Due_Process( Process: Math_Pk.Math_Procedure_Ptr ) is |
| begin |
| Process(First_Num, Second_Num, Total_Num); |
| end Due_Process; |
| |
| begin |
| |
| Report.Test ("C3A0010", "Check that an access-to-subprogram type in a " |
| & "generic instance may be used to declare " |
| & "access-to-subprogram objects which invoke " |
| & "subprograms in the instance"); |
| |
| -- Check for correct defaulting |
| if Math_Pk."/="( Math_Access, null) then |
| Report.Failed("subprogram access type object not initialized to null"); |
| end if; |
| |
| Math_Access := Math_Pk.Add'Access; |
| |
| -- Invoking Add procedure designated by access value |
| Due_Process( Math_Access ); |
| |
| If Total_Num /= 3.0 then |
| Report.Failed ("Incorrect Add result"); |
| end if; |
| |
| Math_Access := Math_Pk.Subtract'Access; |
| |
| Due_Process( Math_Access ); |
| |
| If Total_Num /= -1.0 then |
| Report.Failed ("Incorrect Subtract result"); |
| end if; |
| |
| Math_Access := Max'Access; |
| |
| Due_Process( Math_Access ); |
| |
| If Total_Num /= 2.0 then |
| Report.Failed ("Incorrect Max result"); |
| end if; |
| |
| Report.Result; |
| |
| end C3A0010; |