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Message #02731
Re: acces to sphere/wall information
Hi, I'm trying to use the two ways
1. dynamic_cast and 2. class indices
and i have these results:
//first possibility (dynamic_cast)
/FOREACH ( const shared_ptr<Body>& b, *ncb->bodies )
{
if ( !b ) continue;
if (dynamic_cast<Sphere*>(b->shape.get()))
{
Sphere* s=YADE_CAST<Sphere*> ( b->shape.get() );
const body_id_t& id = b->getId();
cout << "is it a sphere?? id == " << id << endl;
}
else if (dynamic_cast<Wall*>(b->shape.get()))
{
Wall* w = YADE_CAST<Wall*> ( b->shape.get() );
const body_id_t& id = b->getId();
cout << "is it a wall?? id == " << id << endl;
}
}/
This test seems to work only for spheres, not for walls, i never get the
second cout message.
On the contrary, if I do:
/if (dynamic_cast<Sphere*>(b->shape.get()))
{************}
else
{is it a wall? etc.etc.}/
it works, I get the message..
/is it a wall?? id == 0
is it a wall?? id == 1
etc. etc.
/
I have something similar with the second possibility.
//second possibility (class_index)
/ shared_ptr<Sphere> sph(new Sphere);
shared_ptr<Wall> wll(new Wall);
/ / FOREACH ( const shared_ptr<Body>& b, *ncb->bodies )
{
if ( !b ) continue;
if ( b->shape->getClassIndex() == sph->getClassIndex() )
{
Sphere* s=YADE_CAST<Sphere*> ( b->shape.get() );
const body_id_t& id = b->getId();
cout << "is it a sphere?? id == " << id << endl;
}
else if ( b->shape->getClassIndex() == wll->getClassIndex() )
{
Wall* w = YADE_CAST<Wall*> ( b->shape.get() );
const body_id_t& id = b->getId();
cout << "is it a wall?? id == " << id << endl;
}/
I never get the wall_id message. I get it only by commenting the /else
if /condition "/else /*if ( b->shape->getClassIndex() ==
wll->getClassIndex() )*//"
Why?
Thanks. Emanuele.
Václav Šmilauer a écrit :
I usually use classIndexes, but it needs a bit more than one line. Do we
have a simpler way now (checking class names takes too much time)?
You should try 1. dynamic_cast and 2. class indices. I am not sure which
one will be the winner:
FOREACH(const shared_ptr<Body>& b, *scene->bodies){
if(!b) continue; // deleted bodies
// first possibility
// (not tested, but I think static indices should work just fine)
if(b->shape->getClassIndexStatic()==Sphere::getClassIndexStatic()){ /* ... */ }
else if(b->shape->getClassIndexStatic()==Wall::getClassIndexState()) { /* ... */ }
// second possibility
if(dynamic_cast<Sphere>(b->shape->get())){ /* ... */ }
else if(dynamic_cast<Wall>(b->shape->get())){ /* ... */ }
}
v
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