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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M . D I M --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2012-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- Defines the dimension terminology
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33
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34 ---------------------------
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35 -- Dimension Terminology --
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36 ---------------------------
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37
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38 -- * Dimensioned type
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39
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40 -- A dimensioned type is a type (more accurately a first subtype) to which
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41 -- the aspect Dimension_System applies to.
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42
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43 -- type Mks_Type is new Long_Long_Float
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44 -- with
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45 -- Dimension_System => (
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46 -- (Unit_Name => Meter, Unit_Symbol => 'm', Dim_Symbol => 'L'),
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47 -- (Unit_Name => Kilogram, Unit_Symbol => "kg", Dim_Symbol => 'M'),
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48 -- (Unit_Name => Second, Unit_Symbol => 's', Dim_Symbol => 'T'),
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49 -- (Unit_Name => Ampere, Unit_Symbol => 'A', Dim_Symbol => 'I'),
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50 -- (Unit_Name => Kelvin, Unit_Symbol => 'K', Dim_Symbol => "Θ"),
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51 -- (Unit_Name => Mole, Unit_Symbol => "mol", Dim_Symbol => 'N'),
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52 -- (Unit_Name => Candela, Unit_Symbol => "cd", Dim_Symbol => 'J'));
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53
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54 -- * Dimensioned subtype
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55
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56 -- A dimensioned subtype is a subtype directly defined from the dimensioned
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57 -- type and to which the aspect Dimension applies to.
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58
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59 -- subtype Length is Mks_Type
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60 -- with
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61 -- Dimension => (Symbol => 'm',
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62 -- Meter => 1,
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63 -- others => 0);
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64
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65 package System.Dim is
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66 pragma Pure;
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67
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68 end System.Dim;
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