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Diffstat (limited to 'gcc/ada/libgnat/a-coboho.adb')
| -rw-r--r-- | gcc/ada/libgnat/a-coboho.adb | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/a-coboho.adb b/gcc/ada/libgnat/a-coboho.adb new file mode 100644 index 0000000..9696d1c --- /dev/null +++ b/gcc/ada/libgnat/a-coboho.adb @@ -0,0 +1,99 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 2015-2017, 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; |