119 lines
5.7 KiB
Ada
119 lines
5.7 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNAT RUN-TIME COMPONENTS --
|
|
-- --
|
|
-- A D A . C A L E N D A R --
|
|
-- --
|
|
-- S p e c --
|
|
-- --
|
|
-- --
|
|
-- Copyright (C) 1992-1997 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. --
|
|
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
|
|
-- --
|
|
------------------------------------------------------------------------------
|
|
|
|
package Ada.Calendar is
|
|
|
|
type Time is private;
|
|
|
|
-- Declarations representing limits of allowed local time values. Note that
|
|
-- these do NOT constrain the possible stored values of time which may well
|
|
-- permit a larger range of times (this is explicitly allowed in Ada 95).
|
|
|
|
subtype Year_Number is Integer range 1901 .. 2099;
|
|
subtype Month_Number is Integer range 1 .. 12;
|
|
subtype Day_Number is Integer range 1 .. 31;
|
|
|
|
subtype Day_Duration is Duration range 0.0 .. 86_400.0;
|
|
|
|
function Clock return Time;
|
|
|
|
function Year (Date : Time) return Year_Number;
|
|
function Month (Date : Time) return Month_Number;
|
|
function Day (Date : Time) return Day_Number;
|
|
function Seconds (Date : Time) return Day_Duration;
|
|
|
|
procedure Split
|
|
(Date : Time;
|
|
Year : out Year_Number;
|
|
Month : out Month_Number;
|
|
Day : out Day_Number;
|
|
Seconds : out Day_Duration);
|
|
|
|
function Time_Of
|
|
(Year : Year_Number;
|
|
Month : Month_Number;
|
|
Day : Day_Number;
|
|
Seconds : Day_Duration := 0.0)
|
|
return Time;
|
|
|
|
function "+" (Left : Time; Right : Duration) return Time;
|
|
function "+" (Left : Duration; Right : Time) return Time;
|
|
function "-" (Left : Time; Right : Duration) return Time;
|
|
function "-" (Left : Time; Right : Time) return Duration;
|
|
|
|
function "<" (Left, Right : Time) return Boolean;
|
|
function "<=" (Left, Right : Time) return Boolean;
|
|
function ">" (Left, Right : Time) return Boolean;
|
|
function ">=" (Left, Right : Time) return Boolean;
|
|
|
|
Time_Error : exception;
|
|
|
|
private
|
|
pragma Inline (Clock);
|
|
|
|
pragma Inline (Year);
|
|
pragma Inline (Month);
|
|
pragma Inline (Day);
|
|
|
|
pragma Inline ("+");
|
|
pragma Inline ("-");
|
|
|
|
pragma Inline ("<");
|
|
pragma Inline ("<=");
|
|
pragma Inline (">");
|
|
pragma Inline (">=");
|
|
|
|
-- Time is represented as a signed duration from the base point which is
|
|
-- what Unix calls the EPOCH (i.e. 12 midnight (24:00:00), Dec 31st, 1969,
|
|
-- or if you prefer 0:00:00 on Jan 1st, 1970). Since Ada allows dates
|
|
-- before this EPOCH value, the stored duration value may be negative.
|
|
|
|
-- The time value stored is typically a GMT value, as provided in standard
|
|
-- Unix environments. If this is the case then Split and Time_Of perform
|
|
-- required conversions to and from local times. The range of times that
|
|
-- can be stored in Time values depends on the declaration of the type
|
|
-- Duration, which must at least cover the required Ada range represented
|
|
-- by the declaration of Year_Number, but may be larger (we take full
|
|
-- advantage of the new permission in Ada 95 to store time values outside
|
|
-- the range that would be acceptable to Split). The Duration type is a
|
|
-- real value representing a time interval in seconds.
|
|
|
|
type Time is new Duration;
|
|
|
|
end Ada.Calendar;
|