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From: gautier_niouzes@hotmail.com (Gautier)
Newsgroups: comp.lang.ada
Subject: Re: advantages or disadvantages of ADA over pascal or modula
Date: 8 Jan 2003 09:25:24 -0800
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Date: 2003-01-08T17:25:24+00:00
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Martin Klaiber:

> Will this really work like that? Calendar.Month must not be set to 1
> if IncYear fails. Does this mean, if exception Year_out_of_range is
> raised, the rest of the code in IncMonth will be skipped?

It will. Nothing is worth a little test:
--8<-----8<-----8<-----8<-----8<-----8<-----8<---
with Ada.Text_IO; use Ada.Text_IO;

procedure test_exception is

  subtype type_Month is Natural;
  subtype type_Year is Natural;

  type type_Calendar is tagged record
    Month : type_Month;
    Year : type_Year;
  end record; 

  Year_out_of_range: exception;

  procedure IncYear (Calendar : in out type_Calendar) is
  begin
    if Calendar.Year < 3000 then
      Calendar.Year := Calendar.Year + 1;
    else
      raise Year_out_of_range;
    end if;
  end IncYear;

  procedure IncMonth (Calendar : in out type_Calendar) is
  begin
    if Calendar.Month = 12 then
      IncYear (Calendar);
      Put_Line("[ Trace point 1 ]");
      Calendar.Month := 1;
    else
      Calendar.Month := Calendar.Month + 1;
      Put_Line("[ Trace point 2 ]");
    end if;
  end IncMonth;

  procedure Test( c: type_Calendar ) is
    cobbaye: type_Calendar:= c;
  begin
    IncMonth( cobbaye );
  exception
    when Year_out_of_range => Put("Kaboom - too far in the future");
  end;

begin
  Test((12,2000));
  Test((11,3000));
  Test((12,3000));
end;
--8<-----8<-----8<-----8<-----8<-----8<-----8<---
Output is as expected
[ Trace point 1 ]
[ Trace point 2 ]
Kaboom - too far in the future
________________________________________________________
Gautier  --  http://www.mysunrise.ch/users/gdm/gsoft.htm

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