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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . C A L E N D A R . A R I T H M E T I C --
-- --
-- B o d y --
-- --
-- Copyright (C) 2006-2007, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
package body Ada.Calendar.Arithmetic is
--------------------------
-- Implementation Notes --
--------------------------
-- All operations in this package are target and time representation
-- independent, thus only one source file is needed for multiple targets.
---------
-- "+" --
---------
function "+" (Left : Time; Right : Day_Count) return Time is
R : constant Long_Integer := Long_Integer (Right);
begin
return Arithmetic_Operations.Add (Left, R);
end "+";
function "+" (Left : Day_Count; Right : Time) return Time is
L : constant Long_Integer := Long_Integer (Left);
begin
return Arithmetic_Operations.Add (Right, L);
end "+";
---------
-- "-" --
---------
function "-" (Left : Time; Right : Day_Count) return Time is
R : constant Long_Integer := Long_Integer (Right);
begin
return Arithmetic_Operations.Subtract (Left, R);
end "-";
function "-" (Left, Right : Time) return Day_Count is
Days : Long_Integer;
Seconds : Duration;
Leap_Seconds : Integer;
pragma Warnings (Off, Seconds); -- temporary ???
pragma Warnings (Off, Leap_Seconds); -- temporary ???
pragma Unreferenced (Seconds, Leap_Seconds);
begin
Arithmetic_Operations.Difference
(Left, Right, Days, Seconds, Leap_Seconds);
return Day_Count (Days);
end "-";
----------------
-- Difference --
----------------
procedure Difference
(Left : Time;
Right : Time;
Days : out Day_Count;
Seconds : out Duration;
Leap_Seconds : out Leap_Seconds_Count)
is
Op_Days : Long_Integer;
Op_Leaps : Integer;
begin
Arithmetic_Operations.Difference
(Left, Right, Op_Days, Seconds, Op_Leaps);
Days := Day_Count (Op_Days);
Leap_Seconds := Leap_Seconds_Count (Op_Leaps);
end Difference;
end Ada.Calendar.Arithmetic;
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