1 ------------------------------------------------------------------------------
3 -- GNAT LIBRARY COMPONENTS --
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 --
9 -- Copyright (C) 2015-2019, Free Software Foundation, Inc. --
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. --
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. --
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 ------------------------------------------------------------------------------
28 with Unchecked_Conversion;
30 package body Ada.Containers.Bounded_Holders is
32 function Size_In_Storage_Elements (Element : Element_Type) return Natural;
33 -- This returns the size of Element in storage units. It raises an
34 -- exception if the size is not a multiple of Storage_Unit, or if the size
37 ------------------------------
38 -- Size_In_Storage_Elements --
39 ------------------------------
41 function Size_In_Storage_Elements (Element : Element_Type) return Natural is
42 Max_Size : Natural renames Max_Size_In_Storage_Elements;
45 return S : constant Natural := Element'Size / System.Storage_Unit do
47 (Element'Size mod System.Storage_Unit = 0,
48 "Size must be a multiple of Storage_Unit");
51 (S <= Max_Size, "Size is too big:" & S'Img & " >" & Max_Size'Img);
53 end Size_In_Storage_Elements;
56 Unchecked_Conversion (System.Address, Element_Access);
62 function "=" (Left, Right : Holder) return Boolean is
64 return Get (Left) = Get (Right);
71 function Get (Container : Holder) return Element_Type is
73 return Cast (Container'Address).all;
80 procedure Set (Container : in out Holder; New_Item : Element_Type) is
81 Storage : Storage_Array
82 (1 .. Size_In_Storage_Elements (New_Item)) with
83 Address => New_Item'Address;
85 Container.Data (Storage'Range) := Storage;
92 function To_Holder (New_Item : Element_Type) return Holder is
94 return Result : Holder do
95 Set (Result, New_Item);
99 end Ada.Containers.Bounded_Holders;