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