Re: Why can't PODs have constructors?

From:
"JohnQ" <johnqREMOVETHISprogrammer@yahoo.com>
Newsgroups:
comp.lang.c++
Date:
Fri, 27 Jul 2007 23:03:04 -0500
Message-ID:
<abzqi.82$IE5.18@newssvr17.news.prodigy.net>
"BobR" <removeBadBobR@worldnet.att.net> wrote in message
news:W6sqi.6230$ax1.412@bgtnsc05-news.ops.worldnet.att.net...

JohnQ <johnqREMOVETHISprogrammer@yahoo.com> wrote in message...

"BobR" wrote in message...

struct MyRect : public virtual RECT{


Why the virtual inheritance?


Oops.
I was cleaning out my 'TestBench' program, and removed the wrong code
(had about 5 versions).
Here is the one I meant to post:

struct Rect : RECT{
   Rect( long x1 = 0, long y1 = 0, long x2 = 10, long y2 = 10 ){
         left = x1; bottom = y1; right = x2; top = y2;}


How will the compiler be able to distinguish between using the default
constructor and the one above where you gave default values to all the
arguments? (This is a minor note that is off-topic for the thread).

   };

{ // main() or ?
using std::cout // for NG post
Rect rect( 10, 12, 22, 42 );


Fine. Now how about:

Rect rect8(); // ambiguous

RECT rect1( rect );


Can't do that because RECT has not constructor taking a Rect arg. Are you
suggesting that initializing a struct with a struct (from the RECT& operator
of Rect) works? (My C-ismness, or forgetfulness thereof may be apparent).

RECT rect1a( Rect( 7, 14, 27, 34 ) );


Same question as above (and excuse me if I am at times unpedantic).

Rect rect2;
cout<<" Rect rect.bottom="<< rect.bottom <<'\n'
    <<" RECT rect1.bottom="<< rect1.bottom <<'\n'
    <<" RECT rect1a.bottom="<< rect1a.bottom <<'\n'
    <<" Rect rect2.top="<< rect2.top <<'\n'
    <<" sizeof(rect)="<<sizeof(rect)<<'\n'
    <<" sizeof(rect1)="<<sizeof(rect1)<<std::endl;
}
/* - output -
Rect rect.bottom=12
RECT rect1.bottom=12
RECT rect1a.bottom=14
Rect rect2.top=10
sizeof(rect)=16
sizeof(rect1)=16
*/

Sorry about that.


What you should be sorry for is making me decipher your examples rather than
just stating the obvious (which I think I "summed up" in a near previous
post in this thread (kind of))! :P ;)

John

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When he lies, he speaks from his own,
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