Hi David, You can not empty (reclaim the space) for internal properties (without removing the edges or vertices). Instead I would recommend using external properties... this is in fact the primary reason that the BGL supports external properties. See the example exterior_properties.cpp Cheers, Jeremy On Fri, 14 Nov 2003, David Ohlemacher wrote: ohlema> Hi all. ohlema> ohlema> Partway through my app's execution, I find that I no longer need the ohlema> values in a custom internal property map (edge). The map potentially ohlema> may be quite large. ohlema> ohlema> What is the best way to empty it? ohlema> ohlema> Thanks, ohlema> -d ohlema> ohlema> > Here is my implementation. It is right out of your (very helpful) book. ohlema> > ohlema> > -d ohlema> > ohlema> > namespace boost ohlema> > { ohlema> > // ECInGraph custom properties. ohlema> > enum vertex_com_t {vertex_com = 1223497}; ohlema> > enum edge_nEmailsIn_t {edge_nEmailsIn = 1223498}; ohlema> > enum edge_nEmailsOut_t {edge_nEmailsOut = 1223499}; ohlema> > enum edge_sourceVD_t {edge_sourceVD = 1223500}; ohlema> > BOOST_INSTALL_PROPERTY (vertex, com); ohlema> > BOOST_INSTALL_PROPERTY (edge, nEmailsIn); ohlema> > BOOST_INSTALL_PROPERTY (edge, nEmailsOut); ohlema> > BOOST_INSTALL_PROPERTY (edge, sourceVD); ohlema> > } ohlema> > ohlema> > ohlema> > typedef boost::property <boost::edge_nEmailsOut_t, int, ohlema> > boost::property <boost::edge_nEmailsIn_t, int, ohlema> > boost::property <boost::edge_sourceVD_t, unsigned int> > > ohlema> > InGraphEdgeProps; ohlema> > typedef boost::property <boost::vertex_name_t, std::string, ohlema> > boost::property <boost::vertex_com_t, int> > ohlema> > InGraphVertexProps; ohlema> > ohlema> > typedef boost::adjacency_list < ohlema> > boost::vecS, // Edge list is a std::vector ohlema> > boost::vecS, // Vertex list is a std::vector ohlema> > boost::undirectedS, // undirected graph ohlema> > InGraphVertexProps, // Vertex properties ohlema> > InGraphEdgeProps, // Edge properties ohlema> > boost::no_property // Graph properties ohlema> > > ECInGraph; ohlema> > ohlema> > ohlema> > void EC::InitGraphPropertyMaps() ohlema> > { ohlema> > // m_inGraph property maps. ohlema> > m_g2VName = boost::get(boost::vertex_name, m_inGraph); ohlema> > m_g2Com = boost::get(boost::vertex_com, m_inGraph); ohlema> > m_g2EmailsIn = boost::get(boost::edge_nEmailsIn, m_inGraph); ohlema> > m_g2EmailsOut = boost::get(boost::edge_nEmailsOut, m_inGraph); ohlema> > m_g2SourceVD = boost::get(boost::edge_sourceVD, m_inGraph); ohlema> > } ohlema> > ohlema> ohlema> ohlema> _______________________________________________ ohlema> Boost-users mailing list ohlema> Boost-users@lists.boost.org ohlema> http://lists.boost.org/mailman/listinfo.cgi/boost-users ohlema> ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ----------------------------------------------------------------------