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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . V A L _ E N U M --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2005, 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 2, 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. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package is used to compute the Value attribute for enumeration types
+-- other than those in packages Standard and System. See unit Exp_Imgv for
+-- details of the format of constructed image tables.
+
+package System.Val_Enum is
+ pragma Pure;
+
+ function Value_Enumeration_8
+ (Names : String;
+ Indexes : System.Address;
+ Num : Natural;
+ Str : String)
+ return Natural;
+ -- Used to compute Enum'Value (Str) where Enum is some enumeration type
+ -- 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 parameter Num is the value N - 1 (i.e. Enum'Pos (Enum'Last)).
+ -- The reason that Indexes is passed by address is that the actual type
+ -- is created on the fly by the expander.
+ --
+ -- Str is the argument of the attribute function, and may have leading
+ -- and trailing spaces, and letters can be upper or lower case or mixed.
+ -- If the image is found in Names, then the corresponding Pos value is
+ -- returned. If not, Constraint_Error is raised.
+
+ function Value_Enumeration_16
+ (Names : String;
+ Indexes : System.Address;
+ Num : Natural;
+ Str : String)
+ return Natural;
+ -- Identical to Value_Enumeration_8 except that it handles types
+ -- using array (0 .. Num) of Natural_16 for the Indexes table.
+
+ function Value_Enumeration_32
+ (Names : String;
+ Indexes : System.Address;
+ Num : Natural;
+ Str : String)
+ return Natural;
+ -- Identical to Value_Enumeration_8 except that it handles types
+ -- using array (0 .. Num) of Natural_32 for the Indexes table.
+
+end System.Val_Enum;