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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . W I D _ E N U M --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2009, 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/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package contains the routine used for Enumeration_Type'Width
+
+package System.Wid_Enum is
+ pragma Pure;
+
+ function Width_Enumeration_8
+ (Names : String;
+ Indexes : System.Address;
+ Lo, Hi : Natural)
+ return Natural;
+ -- Used to compute Enum'Width where Enum is some enumeration subtype
+ -- other than those defined in package Standard. Names is a string with
+ -- a lower bound of 1 containing the characters of all the enumeration
+ -- literals concatenated together in sequence. Indexes is the address
+ -- of an array of type array (0 .. N) of Natural_8, where N is the
+ -- number of enumeration literals in the type. The Indexes values are
+ -- the starting subscript of each enumeration literal, indexed by Pos
+ -- values, with an extra entry at the end containing Names'Length + 1.
+ -- The reason that Indexes is passed by address is that the actual type
+ -- is created on the fly by the expander.
+ --
+ -- Lo and Hi are the Pos values of the lower and upper bounds of the
+ -- subtype. The result is the value of Width, i.e. the maximum value
+ -- of the length of any enumeration literal in the given range.
+
+ function Width_Enumeration_16
+ (Names : String;
+ Indexes : System.Address;
+ Lo, Hi : Natural)
+ return Natural;
+ -- Identical to Width_Enumeration_8 except that it handles types
+ -- using array (0 .. Num) of Natural_16 for the Indexes table.
+
+ function Width_Enumeration_32
+ (Names : String;
+ Indexes : System.Address;
+ Lo, Hi : Natural)
+ return Natural;
+ -- Identical to Width_Enumeration_8 except that it handles types
+ -- using array (0 .. Num) of Natural_32 for the Indexes table.
+
+end System.Wid_Enum;