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-------------------------------------------------------------------------------
--- --
--- GNAT LIBRARY COMPONENTS --
--- --
--- 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 --
--- --
--- B o d y --
--- --
--- Copyright (C) 2015, Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 3, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. --
--- --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception, --
--- version 3.1, as published by the Free Software Foundation. --
--- --
--- You should have received a copy of the GNU General Public License and --
--- a copy of the GCC Runtime Library Exception along with this program; --
--- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
--- <http://www.gnu.org/licenses/>. --
-------------------------------------------------------------------------------
-
-with Unchecked_Conversion;
-
-package body Ada.Containers.Bounded_Holders is
-
- function Size_In_Storage_Elements (Element : Element_Type) return Natural;
- -- This returns the size of Element in storage units. It raises an
- -- exception if the size is not a multiple of Storage_Unit, or if the size
- -- is too big.
-
- ------------------------------
- -- Size_In_Storage_Elements --
- ------------------------------
-
- function Size_In_Storage_Elements (Element : Element_Type) return Natural is
- Max_Size : Natural renames Max_Size_In_Storage_Elements;
-
- begin
- return S : constant Natural := Element'Size / System.Storage_Unit do
- pragma Assert
- (Element'Size mod System.Storage_Unit = 0,
- "Size must be a multiple of Storage_Unit");
-
- pragma Assert
- (S <= Max_Size, "Size is too big:" & S'Img & " >" & Max_Size'Img);
- end return;
- end Size_In_Storage_Elements;
-
- function Cast is new
- Unchecked_Conversion (System.Address, Element_Access);
-
- ---------
- -- "=" --
- ---------
-
- function "=" (Left, Right : Holder) return Boolean is
- begin
- return Get (Left) = Get (Right);
- end "=";
-
- -------------
- -- Element --
- -------------
-
- function Get (Container : Holder) return Element_Type is
- begin
- return Cast (Container'Address).all;
- end Get;
-
- ---------
- -- Set --
- ---------
-
- procedure Set (Container : in out Holder; New_Item : Element_Type) is
- Storage : Storage_Array
- (1 .. Size_In_Storage_Elements (New_Item)) with
- Address => New_Item'Address;
- begin
- Container.Data (Storage'Range) := Storage;
- end Set;
-
- ---------------
- -- To_Holder --
- ---------------
-
- function To_Holder (New_Item : Element_Type) return Holder is
- begin
- return Result : Holder do
- Set (Result, New_Item);
- end return;
- end To_Holder;
-
-end Ada.Containers.Bounded_Holders;