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Message from discussion On callbacks
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C Facchini  
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 More options Sep 16 2009, 6:48 pm
From: C Facchini <c.facch...@gmail.com>
Date: Wed, 16 Sep 2009 15:48:10 -0700 (PDT)
Local: Wed, Sep 16 2009 6:48 pm
Subject: Re: On callbacks
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Thank you so much!
It works, plus now I got where I was stuck.

> We usually frown on passing pointers around in ns-3, but prefer to use
> Objects and our reference counting system.  The example above works, but you
> have got to be very, very careful about the lifetime of that ofstream.

> If you look at the CsmaHelper, you will see that the MakeBoundCallback takes
> a Ptr<PcapWriter> as the bound parameter.  This points to an Object that, in
> turn, holds the ofstream object; and so you can pass the Ptr<PcapWriter>
> around by value just fine.  As long as someone has a reference to the
> underlying writer it stays around taking care of the lifetime issue
> automagically.

> So I would take that approach and make my own kind of writer.

I've noticed that every EnableAscii() resorts to AsciiWriter, but I
thought it was overly complicated for my programming skills (that's
why I decided to use just an ostream, which turns out to be more harm
than good as the programmer in question doesn't know how to tame wild
pointers :).

I tried writing my own AsciiWriter and have some scope issues. But
since this problem is not Callback-related, I'd better start another
topic.


 
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