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Diffstat (limited to 'gcc-4.3.1/gcc/ada/a-calari.ads')
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1 files changed, 85 insertions, 0 deletions
diff --git a/gcc-4.3.1/gcc/ada/a-calari.ads b/gcc-4.3.1/gcc/ada/a-calari.ads new file mode 100644 index 000000000..95967a6e8 --- /dev/null +++ b/gcc-4.3.1/gcc/ada/a-calari.ads @@ -0,0 +1,85 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 2005-2006, Free Software Foundation, Inc. -- +-- -- +-- This specification is derived from the Ada Reference Manual for use with -- +-- GNAT. The copyright notice above, and the license provisions that follow -- +-- apply solely to the contents of the part following the private keyword. -- +-- -- +-- 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. -- +-- -- +------------------------------------------------------------------------------ + +-- 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)); + + -- Negative leap seconds occur whenever the astronomical time is faster + -- than the atomic time or as a result of Difference when Left < Right. + + subtype Leap_Seconds_Count is Integer range -2047 .. 2047; + + 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; |