| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . W I D _ E N U M -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2021, 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; |
