id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
9799,polymorphic_downcast does not support virtual inheritance,Camille Gillot <k1000.jlo@…>,No-Maintainer,"The following code barks at compilation :
{{{#!cpp
#include <boost/cast.hpp>

class A {
public:
  virtual ~A();
};

class B
: public A
{};

class C
: public virtual A
{};

int main() {
  A* b = new B; A* c = new C;
  B* bb = boost::polymorphic_downcast<B*>(b); // Fine
  C* cc = boost::polymorphic_downcast<C*>(c); // Error

  delete b; delete c;
  return 0;
}
}}}

static_cast cannot handle downcast from or through a virtual base class, dynamic_cast must be used instead.
A fix would be to test the case of virtual base class with boost::is_virtual_base_of and dispatch the two cases.

Here is a patch doing it.",Patches,closed,To Be Determined,utility,Boost 1.54.0,Problem,wontfix,,