* Shared (garbage collecting) pointers. Copied from Boost.

src/boost/Makefile.am

src/boost/assert.hpp

src/boost/checked_delete.hpp

src/boost/detail/shared_count.hpp

src/boost/detail/workaround.hpp

src/boost/format.hpp

src/boost/format/feed_args.hpp

src/boost/format/format_implementation.cc

src/boost/format/free_funcs.cc

src/boost/format/parsing.cc

src/boost/shared_ptr.hpp

src/boost/throw_exception.hpp