soft and program: comp.lang.c++ - 5 new messages in 4 topics

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* c++0x pods and constructors - 2 messages, 1 author
http://groups.google.com/group/comp.lang.c++/t/5aa5848ff079613f?hl=en
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http://groups.google.com/group/comp.lang.c++/t/d22eb26a6f7e3771?hl=en

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TOPIC: c++0x pods and constructors
http://groups.google.com/group/comp.lang.c++/t/5aa5848ff079613f?hl=en
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== 1 of 2 ==
Date: Thurs, Oct 29 2009 4:56 pm
From: "dragan"

Jerry Coffin wrote:
> In article <VV%Fm.41268$EU5.38030@newsfe05.iad>,
> spambuster@prodigy.net says...
>>
>> Can C++0x PODs/aggregates have user-defined constructors and still be
>> PODs/aggregates? If not, why not? How about conversion operators?
>> And what is the difference between a POD and an aggregate anyway?
>
> In C++ 0x, the definition of POD no longer includes the requirement
> that the class be an aggregate. Instead, it introduces a couple of
> new terms, "standard layout class" and "trivial class". A POD has to
> be both. A user-defined constructor (by itself) does _not_ prevent
> the class from being a POD -- but you have to be really careful. In
> particular, a non-trivial copy constructor or non-trivial destructor
> _does_ prevent it from being a trivial class (IOW, copying with
> memcpy/memmove should work correctly).
>
> A standard layout class basically says it can't have virtual
> functions or virtual base classes, etc.
>
> As long as it fits both of those sets of restrictions, it's a POD.
> IOW, it _can_ have some "convenience ctors".

That's good news. That a POD can be derived from another class is also good
news. What kind of class it can be after derived though is still unclear to
me: can it have non-static data members?

>
> Obviously I'm leaving out some of the details -- see N2960, §9/5, 9/6
> for the full details.

I downloaded N2960. I like to think in terms of the things a POD can or
cannot have rather than the lingo like: trivially copyable, trivial class,
standard layout, and on and on. In another post I wrote my understanding of
what is and isn't allowed.

== 2 of 2 ==
Date: Thurs, Oct 29 2009 4:49 pm
From: "dragan"

James Kanze wrote:

> The
> difference between a POD and a non-POD is that a POD has
> constructors and destructors which are effectively no-ops, and
> an assignment operator which is the equivalent of memcpy; this
> plays a role in various contexts.

From N2960, I gather that a POD may not have user-defined: default
constructor, copy constructor, copy assignment operator, destructor. In
addition, it may not have virtual functions or virtual base classes, at most
one base class and no non-static data members in the most-derived class.
Other things too, but I find the aforementioned most important.

So, the good news is, that seemingly a POD can have constructors other
than the ones listed above and can also have a non-virtual base class. I'm
not sure what "no non-static data members in the most-derived class" means
exactly. The section needs more examples if you ask me.

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http://groups.google.com/group/comp.lang.c++/t/9d48bb6cae886d66?hl=en
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== 1 of 1 ==
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TOPIC: wholesale cheap Nike Dunk Air Dunk Men's Women's shoes,Cheap Nike Dunk
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http://groups.google.com/group/comp.lang.c++/t/d22eb26a6f7e3771?hl=en
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== 1 of 1 ==
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