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