gcc/ada/s-diflio.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                    S Y S T E M . D I M . F L O A T _ I O                 --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2011-2012, 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 --  This package provides output routines for float dimensioned types. All Put
  33 --  routines are modelled after those in package Ada.Text_IO.Float_IO with the
  34 --  addition of an extra default parameter.
  35
  36 --  Parameter Symbol may be used in the following manner (all the examples are
  37 --  based on the MKS system of units as defined in package System.Dim.Mks):
  38
  39 --  Case 1. A value is supplied for Symbol
  40
  41 --    The string appears as a suffix of Item
  42
  43 --      Obj : Mks_Type := 2.6;
  44 --      Put (Obj, 1, 1, 0, " dimensionless");
  45
  46 --      The corresponding output is: 2.6 dimensionless
  47
  48 --  Case 2. No value is supplied for Symbol and Item is dimensionless
  49
  50 --    Item appears without a suffix
  51
  52 --      Obj : Mks_Type := 2.6;
  53 --      Put (Obj, 1, 1, 0);
  54
  55 --      The corresponding output is: 2.6
  56
  57 --  Case 3. No value is supplied for Symbol and Item has a dimension
  58
  59 --    If the type of Item is a dimensioned subtype whose symbolic name is not
  60 --    empty, then the symbolic name appears as a suffix.
  61
  62 --      subtype Length is Mks_Type
  63 --        with
  64 --         Dimension => ('m',
  65 --           Meter =>  1,
  66 --           others => 0);
  67
  68 --      Obj : Length := 2.3 * dm;
  69 --      Put (Obj, 1, 2, 0);
  70
  71 --      The corresponding output is: 0.23 m
  72
  73 --    Otherwise, a new string is created and appears as a suffix of Item.
  74 --    This string results in the successive concatanations between each
  75 --    dimension symbolic name raised by its corresponding dimension power from
  76 --    the dimensions of Item.
  77
  78 --      subtype Random is Mks_Type
  79 --        with
  80 --         Dimension => ("",
  81 --         Meter =>   3,
  82 --         Candela => -1,
  83 --         others =>  0);
  84
  85 --      Obj : Random := 5.0;
  86 --      Put (Obj);
  87
  88 --      The corresponding output is: 5.0 m**3.cd**(-1)
  89
  90 --      Put (3.3 * km * dm * min, 5, 1, 0);
  91
  92 --      The corresponding output is: 19800.0 m**2.s
  93
  94 with Ada.Text_IO; use Ada.Text_IO;
  95
  96 generic
  97    type Num_Dim_Float is digits <>;
  98
  99 package System.Dim.Float_IO is
 100
 101    Default_Fore : Field := 2;
 102    Default_Aft  : Field := Num_Dim_Float'Digits - 1;
 103    Default_Exp  : Field := 3;
 104
 105    procedure Put
 106      (File    : File_Type;
 107       Item    : Num_Dim_Float;
 108       Fore    : Field  := Default_Fore;
 109       Aft     : Field  := Default_Aft;
 110       Exp     : Field  := Default_Exp;
 111       Symbols : String := "");
 112
 113    procedure Put
 114      (Item    : Num_Dim_Float;
 115       Fore    : Field  := Default_Fore;
 116       Aft     : Field  := Default_Aft;
 117       Exp     : Field  := Default_Exp;
 118       Symbols : String := "");
 119
 120    procedure Put
 121      (To      : out String;
 122       Item    : Num_Dim_Float;
 123       Aft     : Field  := Default_Aft;
 124       Exp     : Field  := Default_Exp;
 125       Symbols : String := "");
 126
 127    pragma Inline (Put);
 128
 129 end System.Dim.Float_IO;