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) 2006-2007, 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 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.                                                      --
  21 --                                                                          --
  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.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 package body Ada.Calendar.Arithmetic is
  35
  36    --------------------------
  37    -- Implementation Notes --
  38    --------------------------
  39
  40    --  All operations in this package are target and time representation
  41    --  independent, thus only one source file is needed for multiple targets.
  42
  43    ---------
  44    -- "+" --
  45    ---------
  46
  47    function "+" (Left : Time; Right : Day_Count) return Time is
  48       R : constant Long_Integer := Long_Integer (Right);
  49    begin
  50       return Arithmetic_Operations.Add (Left, R);
  51    end "+";
  52
  53    function "+" (Left : Day_Count; Right : Time) return Time is
  54       L : constant Long_Integer := Long_Integer (Left);
  55    begin
  56       return Arithmetic_Operations.Add (Right, L);
  57    end "+";
  58
  59    ---------
  60    -- "-" --
  61    ---------
  62
  63    function "-" (Left : Time; Right : Day_Count) return Time is
  64       R : constant Long_Integer := Long_Integer (Right);
  65    begin
  66       return Arithmetic_Operations.Subtract (Left, R);
  67    end "-";
  68
  69    function "-" (Left, Right : Time) return Day_Count is
  70       Days         : Long_Integer;
  71       Seconds      : Duration;
  72       Leap_Seconds : Integer;
  73       pragma Warnings (Off, Seconds);        -- temporary ???
  74       pragma Warnings (Off, Leap_Seconds);   -- temporary ???
  75       pragma Unreferenced (Seconds, Leap_Seconds);
  76    begin
  77       Arithmetic_Operations.Difference
  78         (Left, Right, Days, Seconds, Leap_Seconds);
  79       return Day_Count (Days);
  80    end "-";
  81
  82    ----------------
  83    -- Difference --
  84    ----------------
  85
  86    procedure Difference
  87      (Left         : Time;
  88       Right        : Time;
  89       Days         : out Day_Count;
  90       Seconds      : out Duration;
  91       Leap_Seconds : out Leap_Seconds_Count)
  92    is
  93       Op_Days  : Long_Integer;
  94       Op_Leaps : Integer;
  95    begin
  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);
 100    end Difference;
 101
 102 end Ada.Calendar.Arithmetic;