| -- CA11012.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 a child package of a library level instantiation |
| -- of a generic can be the instantiation of a child package of |
| -- the generic. Check that the child instance can use its parent's |
| -- declarations and operations, including a formal type of the parent. |
| -- |
| -- TEST DESCRIPTION: |
| -- Declare a generic package which simulates an integer complex |
| -- abstraction. Declare a generic child package of this package |
| -- which defines additional complex operations. |
| -- |
| -- Instantiate the first generic package, then instantiate the child |
| -- generic package as a child unit of the first instance. In the main |
| -- program, check that the operations in both instances perform as |
| -- expected. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- 21 Dec 94 SAIC Corrected visibility errors for literals |
| -- 27 Feb 97 PWB.CTA Added elaboration pragma at package CA11012_3 |
| --! |
| |
| generic -- Complex number abstraction. |
| type Int_Type is range <>; |
| |
| package CA11012_0 is |
| |
| -- Simulate a generic complex number support package. Complex numbers |
| -- are treated as coordinates in the Cartesian plane. |
| |
| type Complex_Type is private; |
| |
| Zero : constant Complex_Type; -- Real number (0,0). |
| |
| function Complex (Real, Imag : Int_Type) -- Create a complex |
| return Complex_Type; -- number. |
| |
| function "-" (Right : Complex_Type) -- Invert a complex |
| return Complex_Type; -- number. |
| |
| function "+" (Left, Right : Complex_Type) -- Add two complex |
| return Complex_Type; -- numbers. |
| |
| private |
| type Complex_Type is record |
| Real : Int_Type; |
| Imag : Int_Type; |
| end record; |
| |
| Zero : constant Complex_Type := (Real => 0, Imag => 0); |
| |
| end CA11012_0; |
| |
| --==================================================================-- |
| |
| package body CA11012_0 is |
| |
| function Complex (Real, Imag : Int_Type) return Complex_Type is |
| begin |
| return (Real, Imag); |
| end Complex; |
| --------------------------------------------------------------- |
| function "-" (Right : Complex_Type) return Complex_Type is |
| begin |
| return (-Right.Real, -Right.Imag); |
| end "-"; |
| --------------------------------------------------------------- |
| function "+" (Left, Right : Complex_Type) return Complex_Type is |
| begin |
| return ( (Left.Real + Right.Real, Left.Imag + Right.Imag) ); |
| end "+"; |
| |
| end CA11012_0; |
| |
| --==================================================================-- |
| |
| -- Generic child of complex number package. Child must be generic since |
| -- parent is generic. |
| |
| generic -- Complex additional operations |
| |
| package CA11012_0.CA11012_1 is |
| |
| -- More operations on complex number. This child adds a layer of |
| -- functionality to the parent generic. |
| |
| function Real_Part (Complex_No : Complex_Type) |
| return Int_Type; |
| |
| function Imag_Part (Complex_No : Complex_Type) |
| return Int_Type; |
| |
| function "*" (Factor : Int_Type; |
| C : Complex_Type) return Complex_Type; |
| |
| function Vector_Magnitude (Complex_No : Complex_Type) |
| return Int_Type; |
| |
| end CA11012_0.CA11012_1; |
| |
| --==================================================================-- |
| |
| package body CA11012_0.CA11012_1 is |
| |
| function Real_Part (Complex_No : Complex_Type) return Int_Type is |
| begin |
| return (Complex_No.Real); |
| end Real_Part; |
| --------------------------------------------------------------- |
| function Imag_Part (Complex_No : Complex_Type) return Int_Type is |
| begin |
| return (Complex_No.Imag); |
| end Imag_Part; |
| --------------------------------------------------------------- |
| function "*" (Factor : Int_Type; |
| C : Complex_Type) return Complex_Type is |
| Result : Complex_Type := Zero; -- Zero is declared in parent, |
| -- Complex_Number |
| begin |
| for I in 1 .. abs (Factor) loop |
| Result := Result + C; -- Complex_Number "+" |
| end loop; |
| |
| if Factor < 0 then |
| Result := - Result; -- Complex_Number "-" |
| end if; |
| |
| return Result; |
| end "*"; |
| --------------------------------------------------------------- |
| function Vector_Magnitude (Complex_No : Complex_Type) |
| return Int_Type is -- Not a real vector magnitude. |
| begin |
| return (Complex_No.Real + Complex_No.Imag); |
| end Vector_Magnitude; |
| |
| end CA11012_0.CA11012_1; |
| |
| --==================================================================-- |
| |
| package CA11012_2 is |
| |
| subtype My_Integer is integer range -100 .. 100; |
| |
| -- ... Various other types used by the application. |
| |
| end CA11012_2; |
| |
| -- No body for CA11012_2; |
| |
| --==================================================================-- |
| |
| -- Declare instances of the generic complex packages for integer type. |
| -- The instance of the child must itself be declared as a child of the |
| -- instance of the parent. |
| |
| with CA11012_0; -- Complex number abstraction |
| with CA11012_2; -- Package containing integer type |
| pragma Elaborate (CA11012_0); |
| package CA11012_3 is new CA11012_0 (Int_Type => CA11012_2.My_Integer); |
| |
| with CA11012_0.CA11012_1; -- Complex additional operations |
| with CA11012_3; |
| package CA11012_3.CA11012_4 is new CA11012_3.CA11012_1; |
| |
| --==================================================================-- |
| |
| with CA11012_2; -- Package containing integer type |
| with CA11012_3.CA11012_4; -- Complex abstraction + additional operations |
| with Report; |
| |
| procedure CA11012 is |
| |
| package My_Complex_Pkg renames CA11012_3; |
| |
| package My_Complex_Operation renames CA11012_3.CA11012_4; |
| |
| use My_Complex_Pkg, -- All user-defined |
| My_Complex_Operation; -- operators directly |
| -- visible. |
| Complex_One, Complex_Two : Complex_Type; |
| |
| begin |
| |
| Report.Test ("CA11012", "Check that child instance can use its parent's " & |
| "declarations and operations, including a formal " & |
| "type of the parent"); |
| |
| Correct_Range_Test: |
| declare |
| My_Literal : CA11012_2.My_Integer := -3; |
| |
| begin |
| Complex_One := Complex (-4, 7); -- Operation from the generic |
| -- parent package. |
| |
| Complex_Two := My_Literal * Complex_One; -- Operation from the generic |
| -- child package. |
| |
| if Real_Part (Complex_Two) /= 12 -- Operation from the generic |
| or Imag_Part (Complex_Two) /= -21 -- child package. |
| then |
| Report.Failed ("Incorrect results from complex operation"); |
| end if; |
| |
| end Correct_Range_Test; |
| |
| --------------------------------------------------------------- |
| |
| Out_Of_Range_Test: |
| declare |
| My_Vector : CA11012_2.My_Integer; |
| |
| begin |
| Complex_One := Complex (70, 70); -- Operation from the generic |
| -- parent package. |
| My_Vector := Vector_Magnitude (Complex_One); |
| -- Operation from the generic child package. |
| |
| Report.Failed ("Exception not raised in child package"); |
| |
| exception |
| when Constraint_Error => |
| Report.Comment ("Exception is raised as expected"); |
| |
| when others => |
| Report.Failed ("Others exception is raised"); |
| |
| end Out_Of_Range_Test; |
| |
| Report.Result; |
| |
| end CA11012; |
