1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                           S Y S T E M . D I M                            --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 2012-2013, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  Defines the dimension terminology
33
34---------------------------
35-- Dimension Terminology --
36---------------------------
37
38--  * Dimensioned type
39
40--    A dimensioned type is a type (more accurately a first subtype) to which
41--    the aspect Dimension_System applies to.
42
43--      type Mks_Type is new Long_Long_Float
44--        with
45--         Dimension_System => (
46--          (Unit_Name => Meter,    Unit_Symbol => 'm',   Dim_Symbol => 'L'),
47--          (Unit_Name => Kilogram, Unit_Symbol => "kg",  Dim_Symbol => 'M'),
48--          (Unit_Name => Second,   Unit_Symbol => 's',   Dim_Symbol => 'T'),
49--          (Unit_Name => Ampere,   Unit_Symbol => 'A',   Dim_Symbol => 'I'),
50--          (Unit_Name => Kelvin,   Unit_Symbol => 'K',   Dim_Symbol => "Θ"),
51--          (Unit_Name => Mole,     Unit_Symbol => "mol", Dim_Symbol => 'N'),
52--          (Unit_Name => Candela,  Unit_Symbol => "cd",  Dim_Symbol => 'J'));
53
54--  * Dimensioned subtype
55
56--    A dimensioned subtype is a subtype directly defined from the dimensioned
57--    type and to which the aspect Dimension applies to.
58
59--      subtype Length is Mks_Type
60--        with
61--         Dimension => (Symbol => 'm',
62--           Meter =>  1,
63--           others => 0);
64
65package System.Dim is
66   pragma Pure;
67
68end System.Dim;
69