Re: noob question - destructors - freeing memory...

From	someone <newsboost@gmail.com>
Newsgroups	comp.lang.c++
Subject	Re: noob question - destructors - freeing memory...
Date	2011-12-31 18:13 +0100
Organization	A noiseless patient Spider
Message-ID	<jdnfsg$2vv$1@dont-email.me> (permalink)
References	(5 earlier) <jdm312$ji4$1@dont-email.me> <4efe9462$0$283$14726298@news.sunsite.dk> <jdm872$6g7$1@dont-email.me> <jdm8rc$8mu$1@dont-email.me> <1bacfeb8-ebc0-432d-a1c5-a64e23c52bac@n39g2000yqh.googlegroups.com>

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On 12/31/2011 10:50 AM, Nick Keighley wrote:
> On Dec 31, 6:07 am, someone<newsbo...@gmail.com>  wrote:
>> On 12/31/2011 06:56 AM, MikeWhy wrote:
>>> someone wrote:
>
>
>>>> hmmmmmmmmmmmmmmmmmm. Maybe a quick solution is to #define a macro
>>>> exit(num), that does try and catch everytime I risk the program
>>>> otherwise would be calling exit(1) etc... hmmmmmmmmmmmmm....
>
> not sure exactlywhat you're up to here. But
>
>     - hiding standard libraries behind macros seems like a bad idea.
> For a start it makes reading your code very difficult for other
> people.

Ok, you're right... It was just a quick idea, so I didn't have to change 
too much... It's/was a bad idea, I can see that now...

>     - what do you mean "a macro [...] that catches everything"?
> (slightly paraphrashing you)

I mean, I have to "catch" whatever causes the program to quit and just 
before it would otherwise quit, it has to cleanup and THEN quit (not 
before having cleaned up).

> As the other poster said calling exit() in a C++ is generally a bad
> idea. It certainly precludes destrutors being called. I think the
> effect you want could be had by throwing and not catching. This will
> bubble all the way upto the top of the program, calling all the
> relevent DTORs on the way. Then exiting.

I've googled a bit around... It's completely stupid: I use opengl / GLUT 
and it seems, that if someone closes the glut-window, glut will call 
exit(0), exit(1) or whatever... I read that freeGLUT however, doesn't 
have this behaviour... It's ridiculous, isn't it?

With exit(0) from glut, is there any solution to cleaning up and freeing 
memory?

>>> It might be a good way to finish out your test program, which I
>>> understand to be a study of object lifetimes and program flow. I would
>>
>> The test program is finished. It's posted here in the thread. The other
>> program is a big complicated program, where I have to find a solution,
>> to the problem where the destructor is not called, when exit(1) and/or
>> exceptions are thrown...
>
> there's something seriuslywrong if they aren't being called when
> exceptions are thown!

Even if I figure out how to use exceptions: I think glut is not 
"cleanup"-friendly... I can't believe that...

And the OS is not freeing the memory when exit(0) or exit(1) is called?

OS = linux, windows or mac...

>>> not have chosen to introduce auto_ptr so early, but as it turns out, the
>>> role it plays is an important part of the broader topic of
>>> exception-safety.
>>
>>> As a final note, hiding throw in a macro for exit is a bad idea. Blindly
>>> replacing exit(1) with throw(1) might not be altogether unreasonable,
>>> though.
>>
>> Still don't solve the cleanup ("delete" / "free"ing up used memory
>> space) problem... Not sure what to do then...
>
> post a simple, working program that illustrates your problem.

I'm not fully convinced that exceptions are the solution, so I cannot 
show a simple working program yet.

What if the user pushes the "X" to close the glut-window and glut calls 
exit() ? I know glut is not the scope of this group, but I hope someone 
can clarify, because I'm not completely sure what to do now...

Thread

noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 02:43 +0100
  Re: noob question - destructors - freeing memory... "MikeWhy" <boat042-nospam@yahoo.com> - 2011-12-30 20:06 -0600
    Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 03:33 +0100
      Re: noob question - destructors - freeing memory... "MikeWhy" <boat042-nospam@yahoo.com> - 2011-12-30 21:22 -0600
        Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 04:57 +0100
          Re: noob question - destructors - freeing memory... "MikeWhy" <boat042-nospam@yahoo.com> - 2011-12-30 22:28 -0600
            Re: noob question - destructors - freeing memory... "MikeWhy" <boat042-nospam@yahoo.com> - 2011-12-30 22:43 -0600
            Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 05:49 +0100
              Re: noob question - destructors - freeing memory... "MikeWhy" <boat042-nospam@yahoo.com> - 2011-12-30 23:56 -0600
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 07:07 +0100
                Re: noob question - destructors - freeing memory... Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-31 01:50 -0800
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 18:13 +0100
                Re: noob question - destructors - freeing memory... Nobody <nobody@nowhere.com> - 2012-01-01 08:37 +0000
                Re: noob question - destructors - freeing memory... LR <lruss@superlink.net> - 2012-01-01 10:54 -0500
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 00:33 +0100
                Re: noob question - destructors - freeing memory... "MikeWhy" <boat042-nospam@yahoo.com> - 2012-01-01 19:20 -0600
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 03:55 +0100
                Re: noob question - destructors - freeing memory... Stefan Ensslen <stefan@zollsoft.de> - 2012-01-02 04:32 -0800
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 17:40 +0100
                Re: noob question - destructors - freeing memory... Dombo <dombo@disposable.invalid> - 2012-01-02 19:14 +0100
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 21:30 +0100
                Re: noob question - destructors - freeing memory... jgk@panix.com (Joe keane) - 2012-01-07 23:23 +0000
                Re: noob question - destructors - freeing memory... "MikeWhy" <boat042-nospam@yahoo.com> - 2012-01-07 17:43 -0600
                Re: noob question - destructors - freeing memory... Garrett Hartshaw <ghartshaw@gmail.com> - 2012-01-01 22:54 -0500
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 05:29 +0100
                Re: noob question - destructors - freeing memory... Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-01 13:38 -0800
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 00:35 +0100
      Re: noob question - destructors - freeing memory... "Bo Persson" <bop@gmb.dk> - 2011-12-31 12:55 +0100
  Re: noob question - destructors - freeing memory... Garrett Hartshaw <ghartshaw@gmail.com> - 2011-12-30 22:50 -0500
    Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 05:37 +0100
      Re: noob question - destructors - freeing memory... LR <lruss@superlink.net> - 2011-12-31 01:07 -0500
        Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 08:54 +0100
          Re: noob question - destructors - freeing memory... Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-31 02:05 -0800
            Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 18:22 +0100
              Re: noob question - destructors - freeing memory... Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-01 13:45 -0800
                Re: noob question - destructors - freeing memory... Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-02 12:17 +0000
                Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 17:48 +0100
                Re: noob question - destructors - freeing memory... Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-02 20:02 +0000
              Re: noob question - destructors - freeing memory... Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-01 13:42 -0800
      Re: noob question - destructors - freeing memory... Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-31 01:52 -0800
        Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 18:23 +0100
      Re: noob question - destructors - freeing memory... Garrett Hartshaw <ghartshaw@gmail.com> - 2011-12-31 12:35 -0500
        Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 00:47 +0100
  Re: noob question - destructors - freeing memory... Juha Nieminen <nospam@thanks.invalid> - 2011-12-31 09:40 +0000
    Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 18:26 +0100
      Re: noob question - destructors - freeing memory... Garrett Hartshaw <ghartshaw@gmail.com> - 2011-12-31 13:00 -0500
      Re: noob question - destructors - freeing memory... Nobody <nobody@nowhere.com> - 2012-01-01 08:57 +0000
        Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 00:43 +0100
      Re: noob question - destructors - freeing memory... Juha Nieminen <nospam@thanks.invalid> - 2012-01-01 09:03 +0000
        Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 00:49 +0100
          Re: noob question - destructors - freeing memory... LR <lruss@superlink.net> - 2012-01-01 21:11 -0500
            Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-02 05:23 +0100
              Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION
 FOUND? Garrett Hartshaw <ghartshaw@gmail.com> - 2012-01-02 00:14 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-02 17:55 +0100
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-02 22:17 +0100
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION
 FOUND? Garrett Hartshaw <ghartshaw@gmail.com> - 2012-01-02 16:40 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-03 00:48 +0100
              Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? LR <lruss@superlink.net> - 2012-01-02 14:47 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-03 00:43 +0100
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? LR <lruss@superlink.net> - 2012-01-02 20:30 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-03 19:08 +0100
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? LR <lruss@superlink.net> - 2012-01-03 17:46 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-04 21:11 +0100
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? LR <lruss@superlink.net> - 2012-01-04 18:56 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION
 FOUND? Garrett Hartshaw <ghartshaw@gmail.com> - 2012-01-03 19:49 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? LR <lruss@superlink.net> - 2012-01-03 21:51 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION
 FOUND? Garrett Hartshaw <ghartshaw@gmail.com> - 2012-01-03 23:37 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? LR <lruss@superlink.net> - 2012-01-04 14:24 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-04 21:20 +0100
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? LR <lruss@superlink.net> - 2012-01-04 18:51 -0500
                Re: noob question - destructors - freeing memory... POSSIBLE SOLUTION FOUND? someone <newsboost@gmail.com> - 2012-01-05 07:32 +0100
          Re: noob question - destructors - freeing memory... Garrett Hartshaw <ghartshaw@gmail.com> - 2012-01-01 23:02 -0500
            Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 05:33 +0100
            Re: noob question - destructors - freeing memory... "io_x" <a@b.c.invalid> - 2012-01-02 11:05 +0100
          Re: noob question - destructors - freeing memory... Juha Nieminen <nospam@thanks.invalid> - 2012-01-02 06:22 +0000
            Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2012-01-02 18:03 +0100
  Re: noob question - destructors - freeing memory... "Bo Persson" <bop@gmb.dk> - 2011-12-31 12:51 +0100
    Re: noob question - destructors - freeing memory... someone <newsboost@gmail.com> - 2011-12-31 18:18 +0100

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