1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT LIBRARY COMPONENTS                          --
4--                                                                          --
5--       A D A . C O N T A I N E R S . B O U N D E D _ H O L D E R S        --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--            Copyright (C) 2014, Free Software Foundation, Inc.            --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26------------------------------------------------------------------------------
27
28with Unchecked_Conversion;
29with Ada.Assertions; use Ada.Assertions;
30
31package body Ada.Containers.Bounded_Holders is
32
33   pragma Annotate (CodePeer, Skip_Analysis);
34
35   function Size_In_Storage_Elements (Element : Element_Type) return Natural is
36     (Element'Size / System.Storage_Unit)
37       with Pre =>
38       (Element'Size mod System.Storage_Unit = 0 or else
39          raise Assertion_Error with "Size must be a multiple of Storage_Unit")
40       and then
41         (Element'Size / System.Storage_Unit <= Max_Size_In_Storage_Elements
42            or else raise Assertion_Error with "Size is too big");
43   --  This returns the size of Element in storage units. It raises an
44   --  exception if the size is not a multiple of Storage_Unit, or if the size
45   --  is too big.
46
47   function Cast is new
48     Unchecked_Conversion (System.Address, Element_Access);
49
50   ---------
51   -- "=" --
52   ---------
53
54   function "=" (Left, Right : Holder) return Boolean is
55   begin
56      return Get (Left) = Get (Right);
57   end "=";
58
59   -------------
60   -- Element --
61   -------------
62
63   function Get (Container : Holder) return Element_Type is
64   begin
65      return Cast (Container'Address).all;
66   end Get;
67
68   ---------------------
69   -- Replace_Element --
70   ---------------------
71
72   procedure Set (Container : in out Holder; New_Item  : Element_Type) is
73      Storage : Storage_Array
74        (1 .. Size_In_Storage_Elements (New_Item)) with
75          Address => New_Item'Address;
76   begin
77      Container.Data (Storage'Range) := Storage;
78   end Set;
79
80   ---------------
81   -- To_Holder --
82   ---------------
83
84   function To_Holder (New_Item : Element_Type) return Holder is
85   begin
86      return Result : Holder do
87         Set (Result, New_Item);
88      end return;
89   end To_Holder;
90
91end Ada.Containers.Bounded_Holders;
92