gcc/ada/a-calend.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                         A D A . C A L E N D A R                          --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.11 $                              --
  10 --                                                                          --
  11 --          Copyright (C) 1992-1997 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- This specification is derived from the Ada Reference Manual for use with --
  14 -- GNAT. The copyright notice above, and the license provisions that follow --
  15 -- apply solely to the  contents of the part following the private keyword. --
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  26 -- MA 02111-1307, USA.                                                      --
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  33 -- covered by the  GNU Public License.                                      --
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  35 -- GNAT was originally developed  by the GNAT team at  New York University. --
  36 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  37 --                                                                          --
  38 ------------------------------------------------------------------------------
  39
  40 package Ada.Calendar is
  41
  42    type Time is private;
  43
  44    --  Declarations representing limits of allowed local time values. Note that
  45    --  these do NOT constrain the possible stored values of time which may well
  46    --  permit a larger range of times (this is explicitly allowed in Ada 95).
  47
  48    subtype Year_Number  is Integer range 1901 .. 2099;
  49    subtype Month_Number is Integer range 1 .. 12;
  50    subtype Day_Number   is Integer range 1 .. 31;
  51
  52    subtype Day_Duration is Duration range 0.0 .. 86_400.0;
  53
  54    function Clock return Time;
  55
  56    function Year    (Date : Time) return Year_Number;
  57    function Month   (Date : Time) return Month_Number;
  58    function Day     (Date : Time) return Day_Number;
  59    function Seconds (Date : Time) return Day_Duration;
  60
  61    procedure Split
  62      (Date    : Time;
  63       Year    : out Year_Number;
  64       Month   : out Month_Number;
  65       Day     : out Day_Number;
  66       Seconds : out Day_Duration);
  67
  68    function Time_Of
  69      (Year    : Year_Number;
  70       Month   : Month_Number;
  71       Day     : Day_Number;
  72       Seconds : Day_Duration := 0.0)
  73       return    Time;
  74
  75    function "+" (Left : Time;     Right : Duration) return Time;
  76    function "+" (Left : Duration; Right : Time)     return Time;
  77    function "-" (Left : Time;     Right : Duration) return Time;
  78    function "-" (Left : Time;     Right : Time)     return Duration;
  79
  80    function "<"  (Left, Right : Time) return Boolean;
  81    function "<=" (Left, Right : Time) return Boolean;
  82    function ">"  (Left, Right : Time) return Boolean;
  83    function ">=" (Left, Right : Time) return Boolean;
  84
  85    Time_Error : exception;
  86
  87 private
  88    pragma Inline (Clock);
  89
  90    pragma Inline (Year);
  91    pragma Inline (Month);
  92    pragma Inline (Day);
  93
  94    pragma Inline ("+");
  95    pragma Inline ("-");
  96
  97    pragma Inline ("<");
  98    pragma Inline ("<=");
  99    pragma Inline (">");
 100    pragma Inline (">=");
 101
 102    --  Time is represented as a signed duration from the base point which is
 103    --  what Unix calls the EPOCH (i.e. 12 midnight (24:00:00), Dec 31st, 1969,
 104    --  or if you prefer 0:00:00 on Jan 1st, 1970). Since Ada allows dates
 105    --  before this EPOCH value, the stored duration value may be negative.
 106
 107    --  The time value stored is typically a GMT value, as provided in standard
 108    --  Unix environments. If this is the case then Split and Time_Of perform
 109    --  required conversions to and from local times. The range of times that
 110    --  can be stored in Time values depends on the declaration of the type
 111    --  Duration, which must at least cover the required Ada range represented
 112    --  by the declaration of Year_Number, but may be larger (we take full
 113    --  advantage of the new permission in Ada 95 to store time values outside
 114    --  the range that would be acceptable to Split). The Duration type is a
 115    --  real value representing a time interval in seconds.
 116
 117    type Time is new Duration;
 118
 119 end Ada.Calendar;