1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W I D _ E N U M --
10 -- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
33 ------------------------------------------------------------------------------
35 with Unchecked_Conversion;
37 package body System.Wid_Enum is
39 -------------------------
40 -- Width_Enumeration_8 --
41 -------------------------
43 function Width_Enumeration_8
45 Indexes : System.Address;
49 pragma Warnings (Off, Names);
53 type Natural_8 is range 0 .. 2 ** 7 - 1;
54 type Index_Table is array (Natural) of Natural_8;
55 type Index_Table_Ptr is access Index_Table;
57 function To_Index_Table_Ptr is
58 new Unchecked_Conversion (System.Address, Index_Table_Ptr);
60 IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
65 for J in Lo .. Hi loop
66 W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
70 end Width_Enumeration_8;
72 --------------------------
73 -- Width_Enumeration_16 --
74 --------------------------
76 function Width_Enumeration_16
78 Indexes : System.Address;
82 pragma Warnings (Off, Names);
86 type Natural_16 is range 0 .. 2 ** 15 - 1;
87 type Index_Table is array (Natural) of Natural_16;
88 type Index_Table_Ptr is access Index_Table;
90 function To_Index_Table_Ptr is
91 new Unchecked_Conversion (System.Address, Index_Table_Ptr);
93 IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
98 for J in Lo .. Hi loop
99 W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
103 end Width_Enumeration_16;
105 --------------------------
106 -- Width_Enumeration_32 --
107 --------------------------
109 function Width_Enumeration_32
111 Indexes : System.Address;
115 pragma Warnings (Off, Names);
119 type Natural_32 is range 0 .. 2 ** 31 - 1;
120 type Index_Table is array (Natural) of Natural_32;
121 type Index_Table_Ptr is access Index_Table;
123 function To_Index_Table_Ptr is
124 new Unchecked_Conversion (System.Address, Index_Table_Ptr);
126 IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
131 for J in Lo .. Hi loop
132 W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
136 end Width_Enumeration_32;