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[serialization] Question about pointers and casting
by Ben 24 Oct '09

24 Oct '09

Dear Boost Experts -- I'm using g++ 4.2.1, OS X 10.6.1, boost 1.40, although I have also seen this on linux. In attempting to understand how boost::serialization works, I've stumbled across the following curiosity. The following program compiles and runs fine (I've eliminated diagnostic output which verifies the serialization.) #include <iostream> #include <fstream> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> struct A { int v; template<class Ar> void serialize(Ar & ar, const unsigned int ver) { ar & v; } }; int main(int ac, char ** argv) { A a; a.v = 10; A * a1p = &a; const char * fname = "test.bin"; { std::ofstream ofs(fname); boost::archive::binary_oarchive ar(ofs); ar << a1p; } A * a2p; { std::ifstream ifs(fname); boost::archive::binary_iarchive ar(ifs); ar >> a2p; } return 0; } However, if I add a static_cast<A*> to either a1p or a2p (which are already declared to be type A*) in the serialization / deserialization lines, it fails to compile: #include <iostream> #include <fstream> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> struct A { int v; template<class Ar> void serialize(Ar & ar, const unsigned int ver) { ar & v; } }; int main(int ac, char ** argv) { A a; a.v = 10; A * a1p = &a; const char * fname = "test.bin"; { std::ofstream ofs(fname); boost::archive::binary_oarchive ar(ofs); ar << static_cast<A*>(a1p); } A * a2p; { std::ifstream ifs(fname); boost::archive::binary_iarchive ar(ifs); ar >> static_cast<A*>(a2p); } return 0; } Compilation started at Fri Oct 23 14:31:17 make -k debug make all "CXX_FLAGS = -g -fno-inline -m64 -I. -I.. -I/opt/local/include -Wall -Wextra -Wpointer- arith -Wcast-align -Wwrite-strings -Wconversion -Woverloaded-virtual -Wno-sign-compare -Wno- unused -fno-nonansi-builtins" \ "LD_FLAGS = -g -m64" g++ -g -fno-inline -m64 -I. -I.. -I/opt/local/include -Wall -Wextra -Wpointer-arith -Wcast-align - Wwrite-strings -Wconversion -Woverloaded-virtual -Wno-sign-compare -Wno-unused -fno- nonansi-builtins -c test.cc -o test.o test.cc: In function 'int main(int, char**)': test.cc:25: error: no match for 'operator<<' in 'ar << a1p' /opt/local/include/boost/archive/detail/interface_oarchive.hpp:63: note: candidates are: Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = A*, Archive = boost::archive::binary_oarchive] test.cc:33: error: no match for 'operator>>' in 'ar >> a2p' /opt/local/include/boost/archive/detail/interface_iarchive.hpp:60: note: candidates are: Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = A*, Archive = boost::archive::binary_iarchive] make[1]: *** [test.o] Error 1 make[1]: Target `all' not remade because of errors. make: *** [debug] Error 2 Compilation exited abnormally with code 2 at Fri Oct 23 14:31:18 This completely boggles my mind. My limited understanding suggests the compiler should not be able to distinguish between the two programs! I can put the cast on either one of the two pointers and it fails, and using an old style cast to A* also fails. I seem to not understand what boost::serialization is doing generally, so I was hoping the answer to this question (which is obviously a theoretical curiosity and of no practical value) would lead to further insight. Best regards, Ben

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boost.thread query
by Sean Farrow 23 Oct '09

23 Oct '09

Hi: I am considering using boost.threadfir a project and was wondering whether the function passed to boost.thread has to be of any pargicular type i.e void return. Secondly, if I don't call thread.join, will the thread continue executing? I'm terminating the thread with a windows event. Finally, is there a terminate function? Any help appreciated. Sean.

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[serialization] Special case of abstract Interface serialization.
by Germán Diago 23 Oct '09

23 Oct '09

Hello. I have a problem which I think it's not documented, and I don't know how to solve it. The problem is the following: I have a framework with an Object base class. I have an interface IDrawable. Interfaces don't inherit Object. Now I have a container, which holds IDrawables. class IDrawable { virtual void draw() const = 0; } Container<IDrawable *> drawables; //holds IDrawables that I know they are Objects. I do know that inside the drawables, objects are held, so now I want to serialize that container: ar << drawables; IDrawable does not hold any data, but Object does. So I want to serialize these objects in a polymorphic way, so that I can save anything derived from Object which is pointed by an IDrawable. Thanks for your time.

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[serialization] Cannot serialize multimap.
by Germán Diago 23 Oct '09

23 Oct '09

Hi. I have a multimap<A, B> where A and B are not default constructible. I provided load_construct_data and save_construct_data for both, but the library doesn't allow me to serialize this multimap. It fails at compile time: It seems to be the library trying to use default constructors. Does anyone know any way or a workaround or whatever to make this compile correctly? Thanks in advance.

2 2

[asio] icmp example not working on Windows 2000
by Wolfgang Fertsak 23 Oct '09

23 Oct '09

Hello! The icmp example provided with the asio-library throws a system error with code 10044 "The support for the specified socket type does not exist in this address family." when compiled with _WIN32_WINNT 0x0500 and executed on an Win2000 machine. The error comes from the gai_echeck()-function which is called with family AF_INET and socktype SOCK_RAW: inline int gai_echeck(const char* host, const char* service, int flags, int family, int socktype, int protocol) { .... switch (family) { case AF_UNSPEC: break; case AF_INET: case AF_INET6: if (socktype != 0 && socktype != SOCK_STREAM && socktype != SOCK_DGRAM) return EAI_SOCKTYPE; ... I have attached the callstack for call to gai_echeck() I'm using Visual Studio 2005 and boost 1.39. I changed the return value of gai_echeck() back to 0 in the debugger and then the rest of the icmp(ping) example ran without any apparent problems. Best regards, Wolfgang boost::asio::detail::socket_ops::gai_echeck(const char * host=0x0012fad0, const char * service=0x0012faa8, int flags=0, int family=2, int socktype=3, int protocol=1) Line 1380 C++ boost::asio::detail::socket_ops::getaddrinfo_emulation(const char * host=0x0012fad0, const char * service=0x0012faa8, const addrinfo * hintsp=0x0012fa78, addrinfo * * result=0x0012faf0) Line 1441 + 0x1d bytes C++ boost::asio::detail::socket_ops::WspiapiGetAddrInfo(const char * host=0x0012fad0, const char * service=0x0012faa8, const addrinfo * hints=0x0012fa78, addrinfo * * result=0x0012faf0, boost::system::error_code & ec={...}) Line 1801 + 0x15 bytes C++ boost::asio::detail::resolver_service<boost::asio::ip::icmp>::resolve(boost::shared_ptr<void> & __formal={...}, const boost::asio::ip::basic_resolver_query<boost::asio::ip::icmp> & query={...}, boost::system::error_code & ec={...}) Line 147 + 0x51 bytes C++ boost::asio::ip::resolver_service<boost::asio::ip::icmp>::resolve(boost::shared_ptr<void> & impl={...}, const boost::asio::ip::basic_resolver_query<boost::asio::ip::icmp> & query={...}, boost::system::error_code & ec={...}) Line 105 + 0x1b bytes C++ boost::asio::ip::basic_resolver<boost::asio::ip::icmp,boost::asio::ip::resolver_service<boost::asio::ip::icmp> >::resolve(const boost::asio::ip::basic_resolver_query<boost::asio::ip::icmp> & q={...}) Line 98 + 0x1d bytes C++ pinger::pinger(boost::asio::io_service & io_service={...}, const char * destination=0x00324199) Line 32 + 0x1a bytes C++ main(int argc=2, char * * argv=0x00324170) Line 155 + 0x16 bytes C++

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[Program Options] first.cpp compile problem
by philip tucker 23 Oct '09

23 Oct '09

Hello, I'm an enthusiastic and grateful user of boost (multi_index_set, accumulators, much else), so first thanks a lot to you all. But I can't get program_options/example/first.cpp to compile. I am sure it's something simple I've missed, but I can't tell what. I am running boost 1.40, gcc version 4.0.1, on a new iMac. output: cc -g -o test obj/pgmopts.o -lstdc++ Undefined symbols: "boost::program_options::detail::cmdline::run()", referenced from: boost::program_options::basic_command_line_parser<char>::run () in pgmopts .o "boost::program_options::options_description_easy_init::operator() (char const* , boost::program_options::value_semantic const*, char const*)", referenced from: _main in pgmopts.o "boost::program_options::validation_error::what() const", referenced from: vtable for boost::exception_detail::error_info_injector<boost::program_opt ions::invalid_option_value>in pgmopts.o vtable for boost::program_options::invalid_option_valuein pgmopts.o vtable for boost::exception_detail::clone_impl<boost::exception_detail::er ror_info_injector<boost::program_options::invalid_option_value> >in pgmopts.o ... Help! and thanks again.

2 2

[BGL] seg fault
by John Robertson 23 Oct '09

23 Oct '09

Replacing vector < set< Colour > > eColours; with std::map < int, set< Colour > > emColours; in edge properties. Using property_map < graph_t, map < int, <set< Colour > > > edge_properties::*>::type emColours_map = get(&edge_properties::emColours, g); But get compiler error: template argument 2 invalid. Thanks -JR

2 2

[BGL] seg fault
by John Robertson 23 Oct '09

23 Oct '09

Something is goofy. Sometimes only part of my mail message is shown in the boost users list. Part is deleted. Using yahoo mail. Maybe its their new version thats messed up. -JR

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[BGL]seg fault : resend
by John Robertson 23 Oct '09

23 Oct '09

Trying to replace vector with std::map as follows. Replace typedef string Colour; struct edge_properties { vector < set< Colour > > eColours; } with typedef string Colour; struct edge_properties { std::map < int, set< Colour > > emColours; } Using property_map < graph_t, map < int, <set< Colour > > > edge_properties::*>::type emColours_map =get(&edge_properties::emColours,g); getting compiler errors error: template argument 2 is invalid error: template argument 4 is invalid Thanks -JR ReplyReply AllMove...InboxBGLGo to Previous message | Go to Next message | Back to Messages Select Message EncodingASCII (ASCII)Greek (ISO-8859-7)Greek (Windows-1253)Latin-10 (ISO-8859-16)Latin-3 (ISO-8859-3)Latin-6 (ISO-8859-10)Latin-7 (ISO-8859-13)Latin-8 (ISO-8859-14)Latin-9 (ISO-8859-15)W. European (850)W. European (CP858)W. European (HPROMAN8)W. European (MACROMAN8)W. European (Windows-1252)Armenia (ARMSCII-8)Baltic Rim (ISO-8859-4)Baltic Rim (WINDOWS-1257)Cyrillic (866)Cyrillic (ISO-8859-5)Cyrillic (KOI8-R)Cyrillic (KOI8-RU)Cyrillic (KOI8-T)Cyrillic (KOI8-U)Cyrillic (WINDOWS-1251)Latin-2 (852)Latin-2 (ISO-8859-2)Latin-2 (WINDOWS-1250)Turkish (ISO-8859-9)Turkish (WINDOWS-1254)Arabic (ISO-8859-6, ASMO-708)Arabic (WINDOWS-1256)Hebrew (856)Hebrew (862)Hebrew (WINDOWS-1255)Chinese Simplified (GB-2312-80)Chinese Simplified (GB18030)Chinese Simplified (HZ-GB-2312)Chinese Simplified (ISO-2022-CN)Chinese Simplified (WINDOWS-936)Chinese Trad.-Hong Kong (BIG5-HKSCS)Chinese Traditional (BIG5)Chinese Traditional (EUC-TW)Japanese (SHIFT_JIS)Japanese (EUC-JP)Japanese (ISO-2022-JP)Korean (ISO-2022-KR)Korean (EUC-KR)Thai (TIS-620-2533)Thai (WINDOWS-874)Vietnamese (TCVN-5712)Vietnamese (VISCII)Vietnamese (WINDOWS-1258)Unicode (UTF-7)Unicode (UTF-8)Unicode (UTF-16)Unicode (UTF-32)| Full Headers Mail Search #yui-main { background-color:#D6DEEC }gLaunchProfile.stop('RT_RP', false);gLaunchProfile.start('RT_BP');gLaunchProfile.start('LD_JS_BP');YAHOO.mc.intl = "us";YAHOO.mc.IM_TOGGLE_STRINGS = {"im_settings_helpurl" : "http://help.yahoo.com/l/us/yahoo/mail/classic/chat/","im_settings_help_toggle" : "1","im_enable_mobile_l10n": "1","im_sign_in": "true","im_time_format_am" : "AM","im_time_format_pm" : "PM","im_date_time_format" : "{M}/{d}/{yy} {h}:{mm} {A}"};if (YAHOO.mc.page.generic) {YAHOO.mc.page.generic.initComposeMenu();}YAHOO.mc.page.BasieSpaceId= "398300973";YAHOO.mc.page.TriggerULT=true;YAHOO.util.Event.onDOMReady(function () {sessionMgr.initSession();sessionMgr.loadFromBookmarks();});var adPrefetch = true;var isAdPrefetched = false;if (document.getElementById("JSMailOptionsLink")) {document.getElementById("JSMailOptionsLink").href = optionObj["JSMailOptionsLink"];}if (document.getElementById("chk_pop_options") || document.getElementById("chk_pop_error") || document.getElementById("option_bad_folder") || document.getElementById("folders_options_spam") || document.getElementById("folders_options_sent") || document.getElementById("spam_edit_options")) {YAHOO.util.Event.addListener(YAHOO.mc.optionsID, "click", displayOptions, optionObj);}YAHOO.namespace("fcue"); YAHOO.mc.FCUE_METADATA = {imInit:"",imSent:"",fcElap:"1254813133500",fcEcap:"2",fcNag:"",inEcap:"",inElap:""};YAHOO.mc.noCues = false;YAHOO.mc.msgrLoaded = false;YAHOO.mc.loadMsgr = function () {clearTimeout(YAHOO.mc.msgrLoadID);if (hasIM && !YAHOO.mc.msgrLoaded) {YAHOO.mc.msgrLoaded = true;YAHOO.util.Get.script("http://mail.yimg.com/d/combo?/mg/8_0_4/js/im_blue_all.js&/mg/8_0_4/js/us_st…");}};YAHOO.util.Event.on(window, "load", YAHOO.mc.loadMsgr);YAHOO.mc.msgrLoadID = setTimeout(YAHOO.mc.loadMsgr, 5000); if (YAHOO.mc.page.galaxy) { YAHOO.mc.page.galaxy.cleanup(); } YAHOO.mc.page.galaxy = new GalaxyHandler(); function myMsgHandler(fid, mid) { YAHOO.mc.page.galaxy.evtCallBack("showMessage?fid=" + fid + "&mid=" + mid + "&.rand=557745628"); } YAHOO.galaxy.setMsgListener(myMsgHandler); function myFolderHandler(fid, filterBy) { var filterUrl = ""; if (filterBy) { filterUrl += "&filterBy=" + filterBy; } YAHOO.mc.page.galaxy.evtCallBack("showFolder?fid=" + fid + filterUrl + "&.rand=557745628"); } YAHOO.galaxy.setFolderListener(myFolderHandler); gLaunchProfile.stop('LD_JS_BP', false);resizeLeftPane();gLaunchProfile.start('RT_AD_FOOT');

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[BGL] seg fault
by John Robertson 23 Oct '09

23 Oct '09

Trying to replace vector with std::map as follows. Replace typedef string Colour; struct edge_properties { vector < set< Colour > > eColours; } with typedef string Colour; struct edge_properties { std::map < int, set< Colour > > emColours; } Using property_map < graph_t, map < int, <set< Colour > > > edge_properties::*>::type emColours_map =get(&edge_properties::emColours,g); getting compiler errors error: template argument 2 is invalid error: template argument 4 is invalid Thanks -JR

1 0