gcc/ada/a-calari.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --              A D A . C A L E N D A R . A R I T H M E T I C               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2006-2009, 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 package body Ada.Calendar.Arithmetic is
  33
  34    --------------------------
  35    -- Implementation Notes --
  36    --------------------------
  37
  38    --  All operations in this package are target and time representation
  39    --  independent, thus only one source file is needed for multiple targets.
  40
  41    ---------
  42    -- "+" --
  43    ---------
  44
  45    function "+" (Left : Time; Right : Day_Count) return Time is
  46       R : constant Long_Integer := Long_Integer (Right);
  47    begin
  48       return Arithmetic_Operations.Add (Left, R);
  49    end "+";
  50
  51    function "+" (Left : Day_Count; Right : Time) return Time is
  52       L : constant Long_Integer := Long_Integer (Left);
  53    begin
  54       return Arithmetic_Operations.Add (Right, L);
  55    end "+";
  56
  57    ---------
  58    -- "-" --
  59    ---------
  60
  61    function "-" (Left : Time; Right : Day_Count) return Time is
  62       R : constant Long_Integer := Long_Integer (Right);
  63    begin
  64       return Arithmetic_Operations.Subtract (Left, R);
  65    end "-";
  66
  67    function "-" (Left, Right : Time) return Day_Count is
  68       Days         : Long_Integer;
  69       Seconds      : Duration;
  70       Leap_Seconds : Integer;
  71       pragma Warnings (Off, Seconds);        -- temporary ???
  72       pragma Warnings (Off, Leap_Seconds);   -- temporary ???
  73       pragma Unreferenced (Seconds, Leap_Seconds);
  74    begin
  75       Arithmetic_Operations.Difference
  76         (Left, Right, Days, Seconds, Leap_Seconds);
  77       return Day_Count (Days);
  78    end "-";
  79
  80    ----------------
  81    -- Difference --
  82    ----------------
  83
  84    procedure Difference
  85      (Left         : Time;
  86       Right        : Time;
  87       Days         : out Day_Count;
  88       Seconds      : out Duration;
  89       Leap_Seconds : out Leap_Seconds_Count)
  90    is
  91       Op_Days  : Long_Integer;
  92       Op_Leaps : Integer;
  93    begin
  94       Arithmetic_Operations.Difference
  95         (Left, Right, Op_Days, Seconds, Op_Leaps);
  96       Days := Day_Count (Op_Days);
  97       Leap_Seconds := Leap_Seconds_Count (Op_Leaps);
  98    end Difference;
  99
 100 end Ada.Calendar.Arithmetic;