1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . C A L E N D A R . A R I T H M E T I C --
9 -- Copyright (C) 2006-2007, Free Software Foundation, Inc. --
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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 package body Ada.Calendar.Arithmetic is
36 --------------------------
37 -- Implementation Notes --
38 --------------------------
40 -- All operations in this package are target and time representation
41 -- independent, thus only one source file is needed for multiple targets.
47 function "+" (Left : Time; Right : Day_Count) return Time is
48 R : constant Long_Integer := Long_Integer (Right);
50 return Arithmetic_Operations.Add (Left, R);
53 function "+" (Left : Day_Count; Right : Time) return Time is
54 L : constant Long_Integer := Long_Integer (Left);
56 return Arithmetic_Operations.Add (Right, L);
63 function "-" (Left : Time; Right : Day_Count) return Time is
64 R : constant Long_Integer := Long_Integer (Right);
66 return Arithmetic_Operations.Subtract (Left, R);
69 function "-" (Left, Right : Time) return Day_Count is
72 Leap_Seconds : Integer;
73 pragma Warnings (Off, Seconds); -- temporary ???
74 pragma Warnings (Off, Leap_Seconds); -- temporary ???
75 pragma Unreferenced (Seconds, Leap_Seconds);
77 Arithmetic_Operations.Difference
78 (Left, Right, Days, Seconds, Leap_Seconds);
79 return Day_Count (Days);
90 Seconds : out Duration;
91 Leap_Seconds : out Leap_Seconds_Count)
93 Op_Days : Long_Integer;
96 Arithmetic_Operations.Difference
97 (Left, Right, Op_Days, Seconds, Op_Leaps);
98 Days := Day_Count (Op_Days);
99 Leap_Seconds := Leap_Seconds_Count (Op_Leaps);
102 end Ada.Calendar.Arithmetic;