hi list I am using boost to build a small tool that generate a (GRAPHICAL) graph showing dependecies between files ;) I donc guess why g++ returns to me this error. any input will be helpful thanks Ps : excuse me. I will copy all the source file and the error. you can find it a long. #include <qapplication.h> #include <qdir.h> #include <qcanvas.h> #include <iostream.h> #include <vector.h> #include <fstream.h> #include <string.h> #include <fstream> #include <string> #include <iostream> #include <algorithm> #include <string> #include <boost/config.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/property_map.hpp> #include <qstring.h> using namespace std; using namespace boost; enum vertex_first_name_t { vertex_first_name }; namespace boost { BOOST_INSTALL_PROPERTY(vertex, first_name); } template <class EdgeIter, class Graph> void who_owes_who(EdgeIter first, EdgeIter last, const Graph& G) { // Access the propety acessor type for this graph typedef typename property_map<Graph, vertex_first_name_t> ::const_type NamePA; NamePA name = get(vertex_first_name, G); typedef typename boost::property_traits<NamePA>::value_type NameType; NameType src_name, targ_name; while (first != last) { src_name = boost::get(name, source(*first,G)); targ_name = boost::get(name, target(*first,G)); cout << src_name << " owes " << targ_name << " some money" << endl; ++first; } } int main(int argc,char **argv) { // Create the graph, and specify that we will use std::string to // store the first name's. typedef adjacency_list<vecS, vecS, directedS,property<vertex_first_name_t, QString> > MyGraphType; MyGraphType G; property_map<MyGraphType, vertex_first_name_t>::type name= get(vertex_first_name, G); QApplication a( argc, argv ); QCanvas c; QDir dir (".") ; int filesnum=0; QStringList lst = dir.entryList( "*.cpp; *.h" ); for ( QStringList::Iterator it = lst.begin(); it != lst.end(); ++it ) { boost::graph_traits<MyGraphType>::vertex_descriptor v; name[v]=*it; add_vertex(v,G); cerr << *it << endl; filesnum++; } return 0; } g++ -o filetree main.cpp -I /usr/lib/qt-3.1/include -L /usr/lib/qt-3.1/lib -lqt Dans le fichier inclus à partir de /usr/include/c++/3.3.2/backward/iostream.h:31, à partir de main.cpp:4: /usr/include/c++/3.3.2/backward/backward_warning.h:32:2: attention : #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <sstream> instead of the deprecated header <strstream.h>. To disable this warning use -Wno-deprecated. main.cpp: Dans function « int main(int, char**) »: main.cpp:67: error: invalid initialization of reference of type 'const boost::property<vertex_first_name_t, QString, boost::no_property>&' from expression of type 'size_t' /usr/include/boost/graph/detail/adjacency_list.hpp:1916: error: in passing argument 1 of `typename Config::vertex_descriptor boost::add_vertex(typename Config::vertex_property_type&, boost::vec_adj_list_impl<G, C, B>&) [with Graph = boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::property<vertex_first_name_t, QString, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, Config = boost::detail::adj_list_gen<boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::property<vertex_first_name_t, QString, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, boost::vecS, boost::vecS, boost::directedS, boost::property<vertex_first_name_t, QString, boost::no_property>, boost::no_property, boost::no_property, boost::listS>::config, Base = boost::directed_graph_helper<boost::detail::adj_list_gen<boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::property<vertex_first_name_t, QString, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, boost::vecS, boost::vecS, boost::directedS, boost::property<vertex_first_name_t, QString, boost::no_property>, boost::no_property, boost::no_property, boost::listS>::config>]' gmake: *** [filetree] Erreur 1 *** échec *** Accédez au courrier électronique de La Poste : www.laposte.net ; 3615 LAPOSTENET (0,34€/mn) ; tél : 08 92 68 13 50 (0,34€/mn)