gcc/ada/s-dim.ads

   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, 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
  65 package System.Dim is
  66    pragma Pure;
  67
  68 end System.Dim;