Hi Maik,
On Tuesday 21 November 2006 22:11, Maik Justus wrote:
> Hi Durk,
>
> I have added some cerr<<"..." to the source:
> if (towerController->hasActiveTraffic())
> {
> for (TrafficVectorIterator i =
> towerController->getActiveTraffic().begin();
> i != towerController->getActiveTraffic().end(); i++)
> { cerr << "a";
> if (i != current) { cerr << "b";
> //SGWayPoint curr (lon,
> // lat,
> // alt);
> SGWayPoint other (i->getLongitude (),
> i->getLatitude (),
> i->getAltitude ());
> other.CourseAndDistance(curr, &course, &dist);
> bearing = fabs(heading-course);
> if (bearing > 180)
> bearing = 360-bearing;
> if ((dist < mindist) && (bearing < 60.0))
> {
> mindist = dist;
> closest = i;
> minbearing = bearing;
> otherReasonToSlowDown = true;
> }
> } cerr <<"c";
> } cerr<< "d";
> }
> When the crash occur, a "a" is printed on the console. It's the first
> time a "a" is printed, therefore it crashes, when this for-loop is
> executed the very first time. And the only code between printing a "a"
> and another letter is the (i != current) comparison
> Then I modified the comparison to
> if (i->getId() != current->getId())
> and every thing works fine.. After around 10 Minutes I get
> abcdabcdabcdabcd........ on the console and no crash.
> This means, that (i != current) compares (on msvc) not the pointers but
> the objects entry by entry. I don't know why I was not successful by
> adding a == operator.
>
> How can we force, that (i != current) compares pointers and not objects?
Thanks for taking your time to investigate. It seems like MSVC is doing
something else than what gcc. I'm still a bit puzzled by this, because the
i != current comparison is of the same class of operations in statements like
the for() loop just above the code snippet you are citing. (i.e the
for (TrafficVectorIterator i = towerController->getActiveTraffic().begin();
i != towerController->getActiveTraffic().end(); i++)
loop. Apparently, these comparisons work as expected on the MSVC compiler.
>
> As a workaround I suggest to modify this comparison to if (i->getId() !=
> current->getId()) (and as well the comparisons in line 782 and 919)
>
Okay, that seems a reasonable request, which I can do, provided no ill side
effects show up on my development box.
Still, I'd be interested in the expert opinion of another C++ coder who's more
familiar with MSVC than I am.
Cheers,
Durk
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