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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--              A D A . C A L E N D A R . A R I T H M E T I C               --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--         Copyright (C) 2005-2008, Free Software Foundation, Inc.          --
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--                                                                          --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT.  In accordance with the copyright of that document, you can freely --
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-- copy and modify this specification,  provided that if you redistribute a --
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-- modified version,  any changes that you have made are clearly indicated. --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides arithmetic operations of time values using days
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--  and leap seconds. Ada.Calendar.Arithmetic is defined in the Ada 2005
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--  RM (9.6.1).
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package Ada.Calendar.Arithmetic is
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   --  Arithmetic on days:
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   --  Rough estimate on the number of days over the range of Ada time
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   type Day_Count is range
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     -(366 * (1 + Year_Number'Last - Year_Number'First))
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        ..
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     +(366 * (1 + Year_Number'Last - Year_Number'First));
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   subtype Leap_Seconds_Count is Integer range -2047 .. 2047;
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   --  Count of leap seconds. Negative leap seconds occur whenever the
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   --  astronomical time is faster than the atomic time or as a result of
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   --  Difference when Left < Right.
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   procedure Difference
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     (Left         : Time;
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      Right        : Time;
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      Days         : out Day_Count;
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      Seconds      : out Duration;
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      Leap_Seconds : out Leap_Seconds_Count);
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   --  Returns the difference between Left and Right. Days is the number of
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   --  days of difference, Seconds is the remainder seconds of difference
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   --  excluding leap seconds, and Leap_Seconds is the number of leap seconds.
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   --  If Left < Right, then Seconds <= 0.0, Days <= 0, and Leap_Seconds <= 0,
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   --  otherwise all values are nonnegative. The absolute value of Seconds is
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   --  always less than 86_400.0. For the returned values, if Days = 0, then
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   --  Seconds + Duration (Leap_Seconds) = Calendar."-" (Left, Right)
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   function "+" (Left : Time;      Right : Day_Count) return Time;
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   function "+" (Left : Day_Count; Right : Time)      return Time;
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   --  Adds a number of days to a time value. Time_Error is raised if the
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   --  result is not representable as a value of type Time.
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   function "-" (Left : Time;      Right : Day_Count) return Time;
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   --  Subtracts a number of days from a time value. Time_Error is raised if
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   --  the result is not representable as a value of type Time.
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   function "-" (Left : Time;      Right : Time)      return Day_Count;
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   --  Subtracts two time values, and returns the number of days between them.
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   --  This is the same value that Difference would return in Days.
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end Ada.Calendar.Arithmetic;

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