- Boost-users - lists.boost.org

Adding content to a vertex in a graph
by Stephen Torri 28 Aug '07

28 Aug '07

I made this property graph according to the documentation: class Component { public: typedef boost::shared_ptr<Component> ptr_t; }; class My_Graph { typedef boost::property< boost::vertex_name_t, Component::ptr_t > VertexProperty_t; typedef boost::adjacency_list<boost::vecS, // OutEdgeList boost::vecS, // VertexList boost::directedS, // Directed VertexProperty_t> // VertexProperties Graph_t; Graph_t m_graph; }; I cannot see from the MutablePropertyGraph page how I am suppose to add the VertexProperty_t to the vertex when its created. The documentation for the MutablePropertyGraph shows a use of "add_vertex" giving a vertex_propety_type with the graph. template <class G> struct MutablePropertyGraphConcept { typedef typename boost::graph_traits<G>::edge_descriptor edge_descriptor; void constraints() { function_requires< MutableGraphConcept<G> >(); v = add_vertex(vp, g); p = add_edge(u, v, ep, g); } G g; std::pair<edge_descriptor, bool> p; typename boost::graph_traits<G>::vertex_descriptor u, v; typename boost::graph_traits<G>::vertex_property_type vp; typename boost::graph_traits<G>::edge_property_type ep; }; My confusion lies in the fact that the add_vertex function requires a vertex_property_type the first parameter. So I am unsure how to create a vertex_property_type from a Component::ptr. Is a vertex_property_type equivalent to a Component::ptr? boost::graph_traits<Graph_t>::vertex_property_type vertex_propert_obj = Component::ptr ( new Component() ); boost::graph_traits<Graph_t>::vertex_descriptor new_vertex = add_vertex ( vertex_property_obj, m_graph ); Stephen

1 0

[BGL] Bundled Properties and setS Edgelist container
by Sam Peterson 28 Aug '07

28 Aug '07

I know that if I use a setS for the edgelist container for an adjacency_list class, each edge of my graph will only be added once as I build it. This functionality is very desirable for me, but I've found I can't seem to use it with the equally desirable Bundled Property Maps. Specifically, this line of code doesn't seem to work: (*g)[i].paper_id = atoi(row[0]); g is a pointer to my graph. The exact compiler error with g++ 4.1.1 is: error: invalid conversion from 'size_t' to 'void*' Is there anyway I can use these two features together? If not, I'm going to be very disappointed. If that's the case I'd advise making a large note of it in the bundled properties documentation as I wouldn't have bothered with bundled properties if I knew they carried this limitation. -- Sam Peterson peabody(a)freeshell.org peabodyenator(a)gmail.com

3 7

Short mailing list outage at 9:00PM EDT
by Doug Gregor 28 Aug '07

28 Aug '07

There will be a brief outage of the Boost mailing lists from 9:00PM-9:30PM EDT today. No mail will be lost. Subversion and the Trac will still be available during this time. - Doug

1 0

[BGL] read_graphviz and dynamic properties
by Sam Peterson 28 Aug '07

28 Aug '07

I have been trying (unsuccessfully for the past hour), to read a graphviz file into an adjacency_list type. The program stops with a SIGABRT because I haven't mapped "node_id" to anything within the dynamic properties argument. However, I really have no desire to map node_id to anything; this is a very large graph and I'd like to avoid the memory consumption. If I try to map node id to the vertex_index_t map I receive a compiler error stating that's a const property map. If I want to map node_id to vertex_name_t map, I have to add that property to my adjacency_list type which will bloat the memory consumption. I just want to build the graph without worry about the properties. Is there anyway this can be done easily? The documentation on read_graphviz and write_graphviz are sorely lacking on this subject in my opinion. -- Sam Peterson peabody(a)freeshell.org peabodyenator(a)gmail.com

2 3

boost undefined reference md5.
by chun ping wang 28 Aug '07

28 Aug '07

while trying to link to lib boost md5 i get these errors I build using make with -l"boost_md5-mgw41-1_34_1. booost md5 was build using gcc 4.1.2 mingw. C:/Boost/include/boost-1_34_1/boost/md5.hpp:33: undefined reference to `boost::md5::context::context()' C:/Boost/include/boost-1_34_1/boost/md5.hpp:33: undefined reference to `boost::md5::context::context()' C:/Boost/include/boost-1_34_1/boost/md5.hpp:57: undefined reference to `boost::md5::process(void const*, unsigned int, bool)' C:/Boost/include/boost-1_34_1/boost/md5.hpp:46: undefined reference to `boost::md5::clear()' C:/Boost/include/boost-1_34_1/boost/md5.hpp:46: undefined reference to `boost::md5::clear()'

1 0

[Boost.Test] User Exception handling
by Ewgenij Sokolovski 28 Aug '07

28 Aug '07

Hello. On the webpage I read: In case if your test cases may throw custom exceptions (see here for list of exceptions translated by default), you could register translator specific for that exception. http://www.boost.org/libs/test/doc/components/utf/index.html So, if I understand it right, if I throw some custom exception in my test program and do not catch it, then it is catched by the boost test framework and reported in the proper way - if the exception can be translated by default. Now I look at the exceptions, which can be translated by default and see: In majority of the cases the monitored function doesn't need to throw the boost::execution_exception to report an error in the Execution Monitor. If you want a custom error message to be included into the execution_exception's error message, use one of the following C++ types as an exception: * C string. * std:string. * any exception class in std::exception hierarchy. http://www.boost.org/libs/test/doc/components/execution_monitor/index.html#… So, I can use a C string for my exception. I have written a small example test case and included throwing of an uncaught exception in it: try{ throw "blub"; } catch(char* ex){ throw; } As I started the testing process I didn't get a "blub"-Exception message, but Boost.Test internal framework error: unknown reason So, what's wrong? Why is "blub" not reported as "blub"? Can anybody explain that? Regards Ewgenij

6 8

Serialization in an array
by Hansi Hansi 27 Aug '07

27 Aug '07

Hello, is it possible to serialize a class in a byte-array(e.g. array stream)? best regards Hansjörg _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220

3 2

boost::thread Destructor being called multiple times
by kaliwanagan 27 Aug '07

27 Aug '07

I was just curious as to why the class destructor are (apparently) being called multiple times. I have tried searching the archives to no avail (which prompted me to register and post to the mailinglist). #include <boost/thread/thread.hpp> struct TestingClass { TestingClass() { std::cout << "constructor called" << std::endl; } ~TestingClass() { std::cout << "destructor called" << std::endl; } void operator()() { std::cout << "operator() called" << std::endl; } } testclass; void testBoostThread() { boost::thread thrd (testclass); thrd.join(); } int main () { testBoostThread(); return 0; } The output: constructor called destructor called destructor called destructor called destructor called operator() called destructor called I would appreciate if someone can enlighten me on this. Will having the destructor called multiple times be a cause of concern? Will it cause some undefined symptoms? Is there a way to completely avoid this situation?

4 3

[boost-users][serialization]How to build the whole serialization regression test suite?
by wei niu 27 Aug '07

27 Aug '07

I find run_archive_test.bat, runtest.bat and Jamfile in boost_1_33_1\libs\serialization\test folder. Then I executed run_archive_test.bat,it output: run_archive_test "<test header file>" "<toolset>" "[<boost root directory>]" "[<target directory>]" I didn't know how to give a proper parameter of "test header file".So after reading runtest.bat file I entered command "bjam --dump-test -sTOOLS=vc-7_1 test". It really worked and generated a lot of folders in boost_1_33_1\bin\boost\libs\serialization\test folder and fast consumed all of the free 0.9GB storage space. But I still didn't know how to run so much test files.I executed one of them,it reported sth like "cannot find test_main function".

1 0

[Serialization]Cannot serialize pointer -- newbie needs help
by wei niu 27 Aug '07

27 Aug '07

I cannot serialize an object through a pointer.When running the program,it reports: This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Below is the code : ////////////////////////////////////////////////////////////////////////////////////////////// // // static link library: libboost_serialization-vc71-s-1_33_1.lib // ////////////////////////////////////////////////////////////////////////////////////////////// #include <iostream> #include <fstream> #include <list> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/list.hpp> using std::cout ; using std::endl ; class gps_position { public: int m_degrees ; int m_minu float m_seconds ; gps_position() { m_degrees = m_minutes = m_seconds = 0 ; } gps_position( int degrees, int minutes, float seconds ) { m_degrees = degrees ; m_minutes = minutes ; m_seconds = seconds ; } }; std::ostream& operator << ( std::ostream &out, const gps_position &g ) { return out << g.m_degrees << '\'' << g.m_minutes << '\'' << g.m_seconds; } namespace boost{ namespace serialization{ template <class Archive> void serialize( Archive &ar, gps_position &g, const unsigned int version ) { ar & g.m_degrees ; ar & g.m_minutes ; ar & g.m_seconds ; } } } class bus_stop { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & latitude; ar & longitude; } gps_position latitude; gps_position longitude; protected: bus_stop(const gps_position & lat_, const gps_position & long_) : latitude(lat_), longitude(long_) {} public: bus_stop(){} // See item # 14 in Effective C++ by Scott Meyers. // re non-virtual destructors in base classes. virtual ~bus_stop(){} friend std::ostream& operator << ( std::ostream &out, const bus_stop &bs ) ; }; std::ostream& operator << ( std::ostream &out, const bus_stop &bs ) { return out << bs.latitude << '\t' << bs.longitude ; } class bus_stop_corner : public bus_stop { friend class boost::serialization::access; std::string street1; std::string street2; virtual std::string description() const { return street1 + " and " + street2; } template<class Archive> void serialize(Archive &ar, const unsigned int version) { // save/load base class information ar & boost::serialization::base_object<bus_stop>(*this); ar & street1 & street2; } public: bus_stop_corner(){} bus_stop_corner(const gps_position & _lat, const gps_position & _long, const std::string & _s1, const std::string & _s2 ) : bus_stop(_lat, _long), street1(_s1), street2(_s2) { } friend std::ostream& operator << ( std::ostream &out, const bus_stop_corner &bsc ) ; }; std::ostream& operator << ( std::ostream &out, const bus_stop_corner &bsc ) { return out << dynamic_cast<const bus_stop&>(bsc) << ' ' << bsc.description() ; } class bus_route { friend class boost::serialization::access; bus_stop * stops[2]; template<class Archive> void serialize(Archive & ar, const unsigned int version) { int i; for(i = 0; i < 2; ++i) ar & stops[i]; } public: bus_route() { stops[0] = stops[1] = 0 ; } bus_route( bus_stop *bs1, bus_stop *bs2 ) { stops[0] = bs1, stops[1] = bs2 ; } }; int main() { const char *file_name = "non_intrusive.dat" ; bus_stop *bs0 = new bus_stop_corner( gps_position(34, 135, 52.560f), gps_position(134, 22, 78.30f), "24th Street", "10th Avenue" ); bus_stop *bs1 = new bus_stop_corner( gps_position(35, 137, 23.456f), gps_position(133, 35, 54.12f), "State street", "Cathedral Vista Lane" ); const bus_route br( bs0, bs1 ) ; { std::ofstream ofs( file_name ) ; boost::archive::text_oarchive oa( ofs ) ; oa << (br) ; } bus_route newbr ; { std::ifstream ifs( file_name ) ; boost::archive::text_iarchive ia( ifs ) ; ia >> newbr ; } return 0 ; } I think maybe it's because I didn't build the serialize library correctly.Ibuilded it with bjam.When debuging it with VS2003,an exception was thrown in the _heap_alloc_base (size_t) function at line 211: line 211: return HeapAlloc(_crtheap, 0, size); Function "void * __cdecl _heap_alloc_base (size_t size)" is in malloc.c.

2 4