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