[Boost-users] [BGL] Using a default-constructed property map for storing temporary vertex properties

Hello all, I am currently working on a generic implementation of the Stoer–Wagner min-cut algorithm using BGL. Crucial to the algorithm is the merging of a vertex s into a vertex t after each phase, creating a new view of the input graph, the merged graph, denoted G/{s, t}. Rather than create a new graph that represents the merged graph, I figured that I could use a vertex property that would be the vertex that each vertex is assigned to at the start of each phase. One of the template parameters of my implementation is the property map type of the "assignment" property map. It is the last template parameter, as it's not as important to the algorithm as others, but I wanted the user to be able to provide the assignment property map type if s/he wanted, otherwise, the implementation would use a "default" property map type and default-constructed instance of the default assignment property map type. I tried `boost::associative_property_map >`, which can be default-constructed, but the first time that I call `boost::get` or `boost::put` on the property map object, I get a SEGFAULT. Apparently, the default construction of `boost::associative_property_map >` did not default-construct a `std::map` object for use in storing the vertex property values. Is there some other property map type that I can use for this purpose? Daniel