Subject:
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Re: Are there GOTO statements in NQC?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 21 Nov 2003 00:39:22 GMT
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Original-From:
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T. Alexander Popiel <popiel@wolfskeep.&StopSpammers&com>
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Viewed:
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1191 times
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In message: <3FBD54CB.1080501@airmail.net>
Steve Baker <sjbaker1@airmail.net> writes:
> T. Alexander Popiel wrote:
>
> > This exact same argument can be applied to high-level languages
> > where you dynamically allocate memory or other resources that need
> > to be released before leaving the function.
>
> Which is why we have C++.
*snicker*
I'm surprised you used C as one of your example languages, then.
Anyway, not all of us are so lucky as to be able to choose a language
where you can hide all your cleanup code like that. As a personal issue,
I find such cleanup hiding hard to follow, too.
> With memory constructors and destructors, quite complex resources can be
> automatically and cleanly free'd up on exit from a function.
I've seen this bite people (not just me), too, particularly when there's
a subtle bug in the destructor and they can't find where it's getting
called. I generally dislike complex programmer-specified logic getting
magically invoked at inobvious times.
Out of curiosity, is a destructor for an object supposed to be called
when the variable goes out of scope, or when the function that it's
allocated in ends? This can be different if the variable is declared
in a nested block, instead of at the top of the function. I think I've
seen both in C++ implementations... The many ways this could have
significant effect on the result are left as an exercise to the reader.
- Alex
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Message has 1 Reply:
 | | Re: Are there GOTO statements in NQC?
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| Don't know about C/C++, but IIRC in Java the garbage collector destroys objects not when they are out of scope, nor when their creator function exits. It destroys them when the object is no longer referenced by any threads. That is to say, if (...) (21 years ago, 21-Nov-03, to lugnet.robotics)
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Message is in Reply To:
| | Re: Are there GOTO statements in NQC?
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| (...) Which is why we have C++. With memory constructors and destructors, quite complex resources can be automatically and cleanly free'd up on exit from a function. ---...--- Steve Baker ---...--- HomeEmail: <sjbaker1@airmail.net> WorkEmail: (...) (21 years ago, 20-Nov-03, to lugnet.robotics)
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