Re: [Boost-users] [BGL] there is no in_edges() function for adjacency_matrix<>

Dmitry Bufistov writes:

Hi, A huge disappointment again came to me today. I used boost::adjacencyboost::directedS class for representation of simple Petri net. I was trying to define the following function ////////////////////////////////////////// bool if_enabled(transition_descriptor_t tr, graph_t net) { assert((net[tr].m_node_type == TRANSITION) && "if_enabled called with non transition node");

BGL_FORALL_INEDGES_T(tr, ed, net, graph_t) { if (net[boost::source(ed, net)].m_tokens_number < net[ed].m_weight) return false; } return true; }

////////////////////////////////////////////////////////// But I failed because of lack of boost::in_edges() function specialization for type that I've chosen. Am I doing something wrong? Any ideas how to implement my function in resonable way would be greatly appreciated. Note: all works fine with "adjacency_list"

By /definition/, BidirectionalGraph is a graph where you can enumerate the incoming edges for any node. Unless you specify bidirectionalS, an adjacency list won't be a BidirectionalGraph, and you can't use in_edges. So everything is working just as I would expect it to. -- Dave Abrahams Boost Consulting www.boost-consulting.com