[Boost-users] Properties (newbie)

Hi all, I am a new boost user (2 days old ...). I just want to know a few things. 1. I use an adjacency_list with my own properties to store my graph. I just want to know if it is possible to manipulate directly the properties' values. At the moment, I use get(...) to obtain the property, make my change, and use put(...) to set the new value. 2. My graph cannot contain parallel edges, so I use a setS. However, the documentation says that listS or vecS is more efficient in time and space complexity. Is it possible to use std::vector or std::list and to disallow parallele edges ? Thanks in advance Olivier