[boost] shared_ptr inheritance relationship

From: Eric Woodruff (Eric.Woodruff_at_[hidden])
Date: 2002-08-16 00:27:56

I'd like to have the inhertance relationship added to shared_ptr. Attached
is a version of shared_ptr.hpp with the simple modification made.

Below is an example of usage:

#include <iostream>
#include <boost/shared_ptr.hpp>

class Root {};
class Child : public Root {};

typedef boost::shared_ptr<Root> HRoot;
typedef boost::shared_ptr<Child, boost::inherits<HRoot> > HChild;
// of course it can be done without the inherits class, but it is worth it
for the clarity

int main ()
{
 try {
  throw HChild (new Child);
 }
 catch (HRoot root) {
  std::cout << "yay!" << std::endl;
 }

 return 0;
}