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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/testsuite/ada/acats/support/fc70b00.a
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+-- FC70B00.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.
+--*
+--
+-- FOUNDATION DESCRIPTION:
+-- This foundation defines a generic list abstraction. List elements can
+-- be of any (nonlimited) type. Lists are implemented as singly linked
+-- lists. Access to list elements is sequential. For each list, pointers
+-- are maintained to the first and last elements in the list, as well as
+-- the next element to be accessed.
+--
+-- CHANGE HISTORY:
+-- 06 Dec 94 SAIC ACVC 2.0
+--
+--!
+
+generic -- List abstraction.
+ type Element_Type is private; -- List elems can be of any nonlimited type.
+package FC70B00 is
+
+ type List_Type is limited private;
+
+ -- Return true if current element is last in the list.
+ function End_Of_List (L : List_Type) return Boolean;
+
+ -- Read current element value; do NOT advance "current" pointer.
+ procedure View_Element (L : in List_Type; E : out Element_Type);
+
+ -- Read from current element and advance "current" pointer.
+ procedure Read_Element (L : in out List_Type; E : out Element_Type);
+
+ -- Write to current element and advance "current" pointer.
+ procedure Write_Element (L : in out List_Type; E : in Element_Type);
+
+ -- Add element to end of list.
+ procedure Add_Element (L : in out List_Type; E : in Element_Type);
+
+ -- Set "current" pointer to first list element.
+ procedure Reset (L : in out List_Type);
+
+private
+
+ type Node_Type;
+ type Node_Pointer is access Node_Type;
+
+ type Node_Type is record
+ Item : Element_Type;
+ Next : Node_Pointer;
+ end record;
+
+ type List_Type is record
+ First : Node_Pointer;
+ Current : Node_Pointer;
+ Last : Node_Pointer;
+ end record;
+
+end FC70B00;
+
+
+ --==================================================================--
+
+
+package body FC70B00 is
+
+ function End_Of_List (L : List_Type) return Boolean is
+ begin
+ return (L.Current = null);
+ end End_Of_List;
+
+
+ procedure View_Element (L : in List_Type; E : out Element_Type) is
+ begin
+ -- ... Error-checking code omitted for brevity.
+ E := L.Current.Item; -- Retrieve current element.
+ end View_Element;
+
+
+ procedure Read_Element (L : in out List_Type; E : out Element_Type) is
+ begin
+ -- ... Error-checking code omitted for brevity.
+ E := L.Current.Item; -- Retrieve current element.
+ L.Current := L.Current.Next; -- Advance "current" pointer.
+ end Read_Element;
+
+
+ procedure Write_Element (L : in out List_Type; E : in Element_Type) is
+ begin
+ -- ... Error-checking code omitted for brevity.
+ L.Current.Item := E; -- Write to current element.
+ L.Current := L.Current.Next; -- Advance "current" pointer.
+ end Write_Element;
+
+
+ procedure Add_Element (L : in out List_Type; E : in Element_Type) is
+ New_Node : Node_Pointer := new Node_Type'(E, null);
+ begin
+ if L.First = null then -- No elements in list, so add new
+ L.First := New_Node; -- element at beginning of list.
+ else
+ L.Last.Next := New_Node; -- Add new element at end of list.
+ end if;
+ L.Last := New_Node; -- Set last-in-list pointer.
+ end Add_Element;
+
+
+ procedure Reset (L : in out List_Type) is
+ begin
+ L.Current := L.First; -- Set "current" pointer to first
+ end Reset; -- list element.
+
+
+end FC70B00;