In boost v1.47, filesystem\v3\src\path.cpp, inside function m_path_iterator_increment, on line 654,

It should be:

  it.m_element.m_pathname = preferred_separator;

Instead of 

  it.m_element.m_pathname = separator;

Reason:

In below sample code

  boost::filesystem::path new_path;

  for (fs::path::iterator i=path.begin();i!=path.end();i++)

    new_path/=(*i);

On windows when iterating a path using above code, line 654 incorrectly appends / instead of \ after drive letter. 

For example, 

  D:\path\file

Becomes,

  D:/path\file

I have created a trac ticket for the same: https://svn.boost.org/trac/boost/ticket/5989

SG