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std::copy, boost::shared_ptr

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I was working around with std::containers filled with boost::shared_ptr and noticed that some code failed on std::copy. Here's an example
std::vector < boost::shared_ptr < int  > > v1;
  std::vector < boost::shared_ptr <  int  > > v2;
  v1.push_back(boost::shared_ptr < int  >( new  int ));
  v1.push_back(boost::shared_ptr < int  >( new  int ));
  v1.push_back(boost::shared_ptr < int  >( new  int ));

//this works fine
for(std::vector < boost::shared_ptr < int  > >::iterator itr=v1.begin(); itr!=v1.end(); ++itr){

//this doesn't work
std::copy(v1.begin(), v1.end(), v2.begin());

//this doesn't work
std::copy(v1.begin(), v1.end(), v2.end());

It also works if the destination vector already has an element in it. Strange. It seems as though I can only std::copy to a vector that already has elements in it. I'd really like to be able to use std::copy(v1.begin(), v1.end(), v2.end()); instead of a for loop. Is there any reason why I cant copy v1 to v2? The program segfaults in boost::shared+ptr's assignment operator. Thank You

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