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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) 1992-2000, 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, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, 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 (Val_Enum);
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;
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