Example of bad behavior from particle boundary conditions

[Steve Nolen]

I have made a small adjustment to 'Bounce.cpp' to show the problem i'm
seeing.  i am compiling under Metrowerks 6.1 for the PC.  if I move the new
call, addBCs, around it exhibits different behavior.

i believe the problem may originate from a call in ParticleBC.h shown below.

  // Factory method to create the boundary condition.
  template <class Subject, class Object>
  ParticleBCItem* create(const Subject& s, const Object& o) const
  {
    typedef ParticleBC<Subject,Object,BCType> PBC_t;
    return new PBC_t(s, o, static_cast<const BCType&>(*this));
  }

the pointer is stored in a stl vector of bc pointers within the particle
base class.

something about this doesn't look quite right.

-steve
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