c392003.a

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-- C392003.A
--
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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--     PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
--      Check that the use of a class-wide formal parameter allows for the 
--      proper dispatching of objects to the appropriate implementation of 
--      a primitive operation.  Check this where the root tagged type is
--      defined in a package, and the extended type is defined in a nested
--      package.
--
-- TEST DESCRIPTION:
--      Declare a root tagged type, and some associated primitive operations.
--      Extend the root type, and override one or more primitive operations, 
--      inheriting the other primitive operations from the root type.
--      Derive from the extended type, again overriding some primitive
--      operations and inheriting others (including some that the parent 
--      inherited).
--      Define a subprogram with a class-wide parameter, inside of which is a 
--      call on a dispatching primitive operation.  These primitive operations
--      modify global variables (the class-wide parameter has mode IN).
--     
--     
--     
-- The following hierarchy of tagged types and primitive operations is 
-- utilized in this test:
--
--    type Bank_Account (root)
--            |
--            | Operations
--            |   Increment_Bank_Reserve
--            |   Assign_Representative
--            |   Increment_Counters
--            |   Open
--            |
--    type Savings_Account (extended from Bank_Account)
--            |
--            | Operations
--            |   (Increment_Bank_Reserve) (inherited)
--            |   Assign_Representative    (overridden)
--            |   Increment_Counters       (overridden)
--            |   Open                     (overridden)
--            |
--    type Preferred_Account (extended from Savings_Account)
--            |
--            | Operations
--            |   (Increment_Bank_Reserve) (inherited twice - Bank_Acct.)
--            |   (Assign_Representative)  (inherited - Savings_Acct.)
--            |   Increment_Counters       (overridden)
--            |   Open                     (overridden)
-- 
--
-- In this test, we are concerned with the following selection of dispatching
-- calls, accomplished with the use of a Bank_Account'Class IN procedure 
-- parameter :
--
--                       \ Type
--               Prim. Op \  Bank_Account  Savings_Account Preferred_Account
--                         \------------------------------------------------ 
--   Increment_Bank_Reserve|      X                               X
--   Assign_Representative |                      X
--   Increment_Counters    |      X               X               X
--
--
--
-- The location of the declaration and derivation of the root and extended
-- types will be varied over a series of tests.  Locations of declaration
-- and derivation for a particular test are marked with an asterisk (*).
--
-- Root type:
--       
--    *  Declared in package.
--       Declared in generic package.
--
-- Extended types:
--
--       Derived in parent location.
--    *  Derived in a nested package.
--       Derived in a nested subprogram.
--       Derived in a nested generic package.
--       Derived in a separate package.
--       Derived in a separate visible child package.
--       Derived in a separate private child package.
--
-- Primitive Operations:
--
--    *  Procedures with same parameter profile.
--       Procedures with different parameter profile.
--    *  Functions with same parameter profile.
--       Functions with different parameter profile.
--    *  Mixture of Procedures and Functions.
--
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--
--!
 
 
 with Report;
 
 procedure C392003 is
 
       --
       -- Types and subtypes.
       --
 
       type Dollar_Amount  is new float;
       type Interest_Rate  is delta 0.001 range 0.000 .. 1.000;
       type Account_Types  is (Bank, Savings, Preferred, Total);
       type Account_Counter is array (Account_Types) of integer;
       type Account_Rep is (President, Manager, New_Account_Manager, Teller);
 
       --
       -- Constants.
       --
 
       Opening_Balance           : constant Dollar_Amount := 100.00;
       Current_Rate              : constant Interest_Rate := 0.030;
       Preferred_Minimum_Balance : constant Dollar_Amount := 1000.00;
 
       --
       -- Global Variables
       --
 
       Bank_Reserve         : Dollar_Amount   := 0.00;
       Daily_Representative : Account_Rep     := New_Account_Manager;
       Number_Of_Accounts   : Account_Counter := (Bank      => 0,
                                                  Savings   => 0,
                                                  Preferred => 0,
                                                  Total     => 0);
 
    -- Root tagged type and primitive operations declared in internal 
    -- package (Accounts).
    -- Extended types (and primitive operations) derived in nested packages.
 
      --=================================================================--
 
    package Accounts is
 
       --
       -- Root account type and primitive operations.
       --
 
       -- Root type.
 
       type Bank_Account is tagged
          record
             Balance : Dollar_Amount;
          end record;
 
       -- Primitive operations of Bank_Account.
 
       function  Increment_Bank_Reserve (Acct : in     Bank_Account) 
         return Dollar_Amount;
       function Assign_Representative   (Acct : in     Bank_Account)
         return Account_Rep;
       procedure Increment_Counters     (Acct : in     Bank_Account);
       procedure Open                   (Acct : in out Bank_Account);
 
      --=================================================================--
                           
       package S_And_L is 
 
          -- Declare extended type in a nested package.
 
          type Savings_Account is new Bank_Account with
          record
             Rate : Interest_Rate;
          end record;
 
          -- Function Increment_Bank_Reserve inherited from 
          -- parent (Bank_Account).
 
          -- Primitive operations (Overridden).
          function Assign_Representative (Acct : in     Savings_Account)
            return Account_Rep;
          procedure Increment_Counters   (Acct : in     Savings_Account);
          procedure Open                 (Acct : in out Savings_Account);
                           
 
      --=================================================================--
                           
          package Premium is 
 
             -- Declare further extended type in a nested package.
 
             type Preferred_Account is new Savings_Account with
             record
                Minimum_Balance : Dollar_Amount;
             end record;
 
             -- Function Increment_Bank_Reserve inherited twice.
             -- Function Assign_Representative inherited from parent 
             --   (Savings_Account).
 
             -- Primitive operation (Overridden).
             procedure Increment_Counters (Acct : in     Preferred_Account);
             procedure Open               (Acct : in out Preferred_Account);
 
             -- Function used to verify Open operation for Preferred_Account 
             -- objects.
             function Verify_Open (Acct : in Preferred_Account) return Boolean;
 
          end Premium;