[Boost-users] Compressed Sparse Graph

I'm new to Boost and the graph library and I don't understand why my compiler complains : error: no matching function for call to `add_edge(int, int, boost::compressed_sparse_row_graph&)' My code is copied underneath : I'm trying to simply create a CSR graph and add an edge ... from the CSR header I see that add_edge is an inline function (same as add_vertex etc...)... Why does this not work ?? Thanks ! Jacques #include <iostream> #include "boost/graph/compressed_sparse_row_graph.hpp" #include "boost/graph/graph_utility.hpp" int main (int argc, char * argv[]){ boost::compressed_sparse_row_graph<> csr; std::cout << "Adding 10 vertices" <