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
32package 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
100end Ada.Calendar.Arithmetic;
101