c341a03.a

用于进行gcc测试

-- C341A03.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 object of one class-wide type can initialize a 
--      class-wide object of a different type when the operation is embedded
--      in a generic unit.
--
-- TEST DESCRIPTION:
--      Declare specific-type objects of an extended type.  Declare an array
--      of access values designating class-wide objects, initialized to point
--      to the objects of the specific type.  Define a generic subprogram
--      having a generic formal derived type parameter.  Within the generic,
--      declare a class-wide variable of the formal parameter type.  Verify
--      that the variable can be initialized with the value of an object
--      of another class-wide type within the class.
--
--      The particular root and extended types used in this abstraction are
--      defined in foundation code (F341A00.A), and are graphically displayed
--      as follows:
--
--           package Bank
--              type Account
--                  |
--                  |
--                  |
--               package Checking
--                  type Account
--                      |
--                      |
--                      | 
--                   package Interest_Checking
--                          type Account
--
-- TEST FILES:
--      This test depends on the following foundation code:
--
--         F341A00.A
--
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      16 Dec 94   SAIC    Changed level of 'Class for ATM_Card
--
--!

with F341A00_0;            -- package Bank
generic
   type Account_Type is new F341A00_0.Account with private; -- new Bank.Account
function C341A03_0 (The_Account : Account_Type'Class)       -- function Audit
  return F341A00_0.Dollar_Amount;

function C341A03_0 (The_Account : Account_Type'Class)
  return F341A00_0.Dollar_Amount is
   Acct : Account_Type'Class := The_Account;  -- Init. of class-wide with
begin                                         -- another class-wide object.
   return Acct.Current_Balance;
end C341A03_0;


     --=================================================================--


with F341A00_0;            -- package Bank
with F341A00_1;            -- package Checking
with C341A03_0;            -- generic function Audit
with Report;

procedure C341A03 is

   package Bank     renames F341A00_0;
   package Checking renames F341A00_1;

   Current_Checking_Accounts : constant := 3;

   Checking_Acct1 : aliased Checking.Account := (Current_Balance => 10.00,
                                                 Overdraft_Fee   =>  5.00);
   Checking_Acct2 : aliased Checking.Account := (Current_Balance => 20.00,
                                                 Overdraft_Fee   =>  5.00);
   Checking_Acct3 : aliased Checking.Account := (Current_Balance => 30.00,
                                                 Overdraft_Fee   =>  5.00);

   type ATM_Card is access all Checking.Account'Class;

   -- Declare array of accesses to class-wide objects.
   Account_Array : array (1 .. Current_Checking_Accounts) of 
     ATM_Card := (Checking_Acct1'Access, 
                  Checking_Acct2'Access, 
                  Checking_Acct3'Access);
begin  -- C341A03

   Report.Test ("C341A03",  "Check that an object of one class-wide type " &
                            "can initialize a class-wide object of a "   &
                            "different type when the operation is embedded " &
                            "in a generic unit" );

   Audit_Checking_Accounts:
   declare
      Balance_In_Checking_Accounts : Bank.Dollar_Amount := 0.00;
      -- Instantiate with a specific extended type.
      function Checking_Audit is new C341A03_0 (Checking.Account);
      use type Bank.Dollar_Amount;
   begin

      for I in 1 .. Current_Checking_Accounts loop
         Balance_In_Checking_Accounts := Balance_In_Checking_Accounts + 
           Checking_Audit (Account_Array (I).all);
      end loop;

      if Balance_In_Checking_Accounts /= 60.00 then
         Report.Failed ("Incorrect initialization of class-wide object");
      end if;

   end Audit_Checking_Accounts;

   Report.Result;

end C341A03;