------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- S Y S T E M . W I D _ 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, 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 contains the routine used for Enumeration_Type'Width package System.Wid_Enum is pragma Pure (Wid_Enum); 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;