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--- C3A0001.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 access to subprogram type can be used to select and
--- invoke functions with appropriate arguments dynamically.
---
--- TEST DESCRIPTION:
--- Declare an access to function type in a package specification.
--- Declare three different sine functions that can be referred to by
--- the access to function type.
---
--- In the main program, call each function indirectly by dereferencing
--- the access value.
---
---
--- CHANGE HISTORY:
--- 06 Dec 94 SAIC ACVC 2.0
---
---!
-
-package C3A0001_0 is
-
- TC_Call_Tag : Natural := 0;
-
- -- Type accesses to any sine function
- type Sine_Function_Ptr is access function
- (Angle : in Float) return Float;
-
--- Three 'Sine' functions that model an application situation in which
--- one function might be chosen when speed is important, another (using
--- a different algorithm) might be chosen when accuracy is important,
--- and so on.
-
- function Sine_Calc_Fast (Angle : in Float) return Float;
-
- function Sine_Calc_Acc (Angle : in Float) return Float;
-
- function Sine_Calc_Table (Angle : in Float) return Float;
-
-end C3A0001_0;
-
-
------------------------------------------------------------------------------
-
-
-package body C3A0001_0 is
-
- function Sine_Calc_Fast (Angle : in Float) return Float is
- begin
- TC_Call_Tag := 1;
- return 1.0;
- end Sine_Calc_Fast;
-
-
- function Sine_Calc_Acc (Angle : in Float) return Float is
- begin
- TC_Call_Tag := 2;
- return 0.0;
- end Sine_Calc_Acc;
-
-
- function Sine_Calc_Table (Angle : in Float) return Float is
- begin
- TC_Call_Tag := 3;
- return -1.0;
- end Sine_Calc_Table;
-
-end C3A0001_0;
-
------------------------------------------------------------------------------
-
-with Report;
-with C3A0001_0;
-
-procedure C3A0001 is
-
- Sine_Access : C3A0001_0.Sine_Function_Ptr;
- X, Theta : Float := 0.0;
-
-begin
-
- Report.Test ("C3A0001", "Check that access to subprogram can be " &
- "used to select and invoke an operation with " &
- "appropriate arguments dynamically");
-
- Sine_Access := C3A0001_0.Sine_Calc_Fast'Access;
-
- -- Invoking Sine function designated by access value
- X := Sine_Access(Theta);
-
- If C3A0001_0.TC_Call_Tag /= 1 then
- Report.Failed ("Incorrect Sine_Calc_Fast result");
- end if;
-
- Sine_Access := C3A0001_0.Sine_Calc_Acc'Access;
-
- -- Invoking Sine function designated by access value
- X := Sine_Access(Theta);
-
- If C3A0001_0.TC_Call_Tag /= 2 then
- Report.Failed ("Incorrect Sine_Calc_Acc result");
- end if;
-
- Sine_Access := C3A0001_0.Sine_Calc_Table'Access;
-
- -- Invoking Sine function designated by access value
- X := Sine_Access(Theta);
-
- If C3A0001_0.TC_Call_Tag /= 3 then
- Report.Failed ("Incorrect Sine_Calc_Table result");
- end if;
-
- Report.Result;
-
-end C3A0001;