November 2007 - Boost-users

Using boost::function and boost::bind
by A Arabadji 26 Nov '07

26 Nov '07

Hello people! I am a new boost user, and I am trying to implement a console for a game, which binds console commands to functions. These functions can come from different objects and this is why I decided to try using boost. I am using Visual Studio 8.0 SP1. I have something like this: //all functions are of generic structure //the return nothing and they take a vector of arguments typedef boost::function1< void, std::vector<std::string>& > funcHolder; //I also have a hash table, which holds function references and the //relative commands: std::map<std::string, funcHolder> commands; //Finally I have a function: void Console::addCommand(const String &command, funcHolder f) { std::map<String, funcHolder>::iterator t = commands.find(command); if(t == commands.end()) commands.insert( make_pair(command, f) ); else commands[command] = f; } All of these things are members of a Console class. So once I added these, I tried adding this line to the constructor: addCommand("clear", boost::bind(&Console::clear, this); //clear method void Console::clear( vector<std::string>& args ) { lines.clear(); } During compilation I get C4180 warnings. I have heard that those are due to VS8.0 SP1 compiler bugs, so I ignore them but then I get a following error: Project : error PRJ0002 : Error result 1 returned from 'C:\Program Files\Microsoft Visual Studio 8\VC\bin\cl.exe'. Compiler basically crashes. Any ideas what might be wrong? I thank everyone in advance, Artyom

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[Boost.Serialization] code works with gcc 4.1.2 but does not compile with gcc 3.3.3
by Christoph 26 Nov '07

26 Nov '07

I have written code to serialize a class hierarchy (with lots of shared_ptrs, strings, vectors etc.). This compiles (and works) on gcc 4.1.2 (OpenSuse 10.3). When trying to compile it on an older machine (gcc 3.3.3) I am getting lots of compiler errors which seem to boil down to the issue the the (de)serialization code fails to instantiate some abstract class in the hierarchy. I understand that instantiating these classes has to fail, what I do not understand is why the same code compiles with gcc 4.1.2... any ideas? What I did was: I have defined the following typedefs/macros typedef boost::archive::binary_iarchive InArchive; typedef boost::archive::binary_oarchive OutArchive; #define DECLARE_AS_SERIALIZABLE \ friend class boost::serialization::access; \ void serialize(InArchive & ar, const unsigned int file_version); \ void serialize(OutArchive & ar, const unsigned int file_version) and have augmented each and every class in the hierarchy with the line DECLARE_AS_SERIALIZABLE /* inside the class */ BOOST_SERIALIZATION_SHARED_PTR(Node); /* after the class decl. */ in the .cpp file I have BOOST_CLASS_EXPORT_GUID(mepl::Node, "Node") // for each class and the implementation of the serialize methods void Node::serialize(InArchive & ar, const unsigned int /* file_version */){ ar & BOOST_SERIALIZATION_NVP(m_sFileName) //& BOOST_SERIALIZATION_NVP(m_sSource) // & BOOST_SERIALIZATION_NVP(m_parentNode) & BOOST_SERIALIZATION_NVP(m_iStartLine) & BOOST_SERIALIZATION_NVP(m_iStartColumn) & BOOST_SERIALIZATION_NVP(m_iEndLine) & BOOST_SERIALIZATION_NVP(m_iEndColumn); } void ExprNode::serialize(InArchive & ar, const unsigned int /* file_version */){ ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Node); bool bConst; ar & BOOST_SERIALIZATION_NVP(m_type) & BOOST_SERIALIZATION_NVP(bConst) & BOOST_SERIALIZATION_NVP(m_wert); m_bIsConst=bConst; } etc. As I've said, this works beautifully with gcc 4.1.2. Have I made a mistake here? Or is the older compiler not suppored in by Boost.Serialization? Small part of the compiler's output //melos/prog/boost/include/boost-1_34_1/boost/serialization/access.hpp: In static member function `static void boost::serialization::access::construct(Archive&, T*) [with Archive = boost::archive::binary_iarchive, T = mepl::Node]': //melos/prog/boost/include/boost-1_34_1/boost/serialization/serialization.hpp:105: instantiated from `void boost::serialization::load_construct_data(Archive&, T*, unsigned int) [with Archive = boost::archive::binary_iarchive, T = mepl::Node]' //melos/prog/boost/include/boost-1_34_1/boost/serialization/serialization.hpp:170: instantiated from `void boost::serialization::load_construct_data_adl(Archive&, T*, unsigned int) [with Archive = boost::archive::binary_iarchive, T = mepl::Node]' //melos/prog/boost/include/boost-1_34_1/boost/archive/detail/iserializer.hpp:308: instantiated from `void boost::archive::detail::pointer_iserializer<T, Archive>::load_object_ptr(boost::archive::detail::basic_iarchive&, void*&, unsigned int) const [with T = mepl::Node, Archive = boost::archive::binary_iarchive]' /usr/include/g++/bits/locale_facets.h:214: instantiated from here //melos/prog/boost/include/boost-1_34_1/boost/serialization/access.hpp:123: error: cannot allocate an object of type `mepl::Node' //melos/prog/boost/include/boost-1_34_1/boost/serialization/access.hpp:123: error: because the following virtual functions are abstract: node.hpp:59: error: virtual void mepl::Node::streamout(std::ostream&) const Thank you, and best regards Christoph

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[Serialization] Need help with wide character i/o
by Mahesh Venkitachalam 26 Nov '07

26 Nov '07

Hello, I am looking for some help in following instructions to create a wide character archive that I found from the boost serialization documentation: Actually the reason I am on this path is because my code is crashing if I try to do this in a normal way. (please see my previous post [Serialization] Strange crash with binary_iarchive) > > > To produce wide character text output (i.e. 16 bit characters on Win32 systems), do the following. > > Open a wide character stream. > Alter the stream locale to use boost::archive::codecvt_null<OStream::char_type> > Create the archive with the flag no_codecvt. Naturally, the input process has to be symmetrical. > My attempt (below) crashed when the archive is read back - what am I doing wrong? std::wofstream bofs("gps.bin", std::ios::binary); std::locale loc(bofs.getloc(), new boost::archive::codecvt_null<wchar_t>()); bofs.imbue(loc); // create class instance const gps_position g2(36, 60, 24.567f); boost::archive::binary_woarchive oa(bofs, boost::archive::no_codecvt); oa << g2; bofs.close(); cout << "reading archive..." << endl; gps_position newg; // create and open an archive for input std::wifstream ifs("gps.bin", std::ios::binary); std::locale loc2(ifs.getloc(), new boost::archive::codecvt_null<wchar_t>()); ifs.imbue(loc2); // CRASHES NEXT LINE boost::archive::binary_wiarchive ia(ifs, boost::archive::no_codecvt); // read class state from archive ia >> newg; The serialized class is below: #include <string> #include <vector> #include <fstream> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_woarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_wiarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/archive/codecvt_null.hpp> using namespace std; class gps_position { private: friend class boost::serialization::access; // When the class Archive corresponds to an output archive, the // & operator is defined similar to <<. Likewise, when the class Archive // is a type of input archive the & operator is defined similar to >>. template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } int degrees; int minutes; float seconds; double* data; public: gps_position(){}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; Thanks Mahesh

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Re : extract url with boost::regex
by hallouina-ml＠yahoo.fr 26 Nov '07

26 Nov '07

No, I don't see this example, I was reading the documentation and example about regex iterator and not regex token iterator. I search on other website but don't find this example. I will study it. Thanks John for always anwsering, and always fast answering. I was completly discouraged. Thanks again! ----- Message d'origine ---- De : John Maddock <john(a)johnmaddock.co.uk> À : boost-users(a)lists.boost.org Envoyé le : Lundi, 26 Novembre 2007, 17h50mn 31s Objet : Re: [Boost-users] extract url with boost::regex hallouina-ml(a)yahoo.fr wrote: > Hello; > > I try to extract an url from a webpage and it's almostly done but > completly unoptimised : > > Before I try with a regex iterator. But I don't understand the > documentation. :-( Did you see this example:http://www.boost.org/libs/regex/example/snippets/regex_token_iterat… It does exactly what you want - it exacts all the URL's from a HTML file. > boost::regex rexp(".*(http:\\/\\/.+)\"*.*"); > > > and I get this result : > > http://www.nolife-tv.com/" > http://www.nolife-tv.com"> > http://www.nolife-tv.com/images/stories/noiz/1.jpg" > http://www.nolife-tv.com/component/option,com_poll/task,results/id,16/Itemi…';" > http://www.joomla.org" > http://www.google-analytics.com/urchin.js" > http://www.omniture.com > > and so on... > > I will cut and get only the url without the " or ' > why this regex get the " with it? I put the close bracket before the > " so why? I already try to do \\" rather than \" Because the .* on the end of the expression will match whatever text follows the ", the grouping construct (...) spits out a *sub-expression* which you can access via the match_results::operator[] or match_results::str(i) methods. HTH, John. [...] _____________________________________________________________________________ Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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extract url with boost::regex
by hallouina-ml＠yahoo.fr 26 Nov '07

26 Nov '07

Hello; I try to extract an url from a webpage and it's almostly done but completly unoptimised : Before I try with a regex iterator. But I don't understand the documentation. I past to many time on this way, so I try an other way : I get my webpage with libcurl then I replace all " " by a "\n" like that : string::size_type i = 0; while (( i = page_a_analyser.find(' ', i ) ) != (string::npos)) { page_a_analyser.replace(i++, 1, "\n" ); } then I apply the regex : boost::regex rexp(".*(http:\\/\\/.+)\"*.*"); and I get this result : http://www.nolife-tv.com/" http://www.nolife-tv.com"> http://www.nolife-tv.com/images/stories/noiz/1.jpg" http://www.nolife-tv.com/component/option,com_poll/task,results/id,16/Itemi…';" http://www.joomla.org" http://www.google-analytics.com/urchin.js" http://www.omniture.com and so on... I will cut and get only the url without the " or ' why this regex get the " with it? I put the close bracket before the " so why? I already try to do \\" rather than \" I try to do (\"|')" too to say " or ', but this doesn't work too... So I do an other way : I get my webpage with libcurl then I replace all " " by a "\n" then replace all " by \n then replace all ' by \n then I apply the regex And I should replace with 3 while rather than only one... because the 3 conditions in one while wasn't working : while ( (( i = page_a_analyser.find(' ', i ) ) != (string::npos)) or ( i = page_a_analyser.find('"', i ) ) != (string::npos) or ( i = page_a_analyser.find('\'', i ) ) != (string::npos) ) So how can I do to just improve the regex to extract the url? to do just something like : replace " " by "\n" then apply the right regex. I don't want to use a regex iterator again. regex iterator win again my patience... 3 day on it is enough for me. Thanks for your attention _____________________________________________________________________________ Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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Decoding hex strings
by Stefan Arentz 26 Nov '07

26 Nov '07

Is there something in Boost that can help me decode hex strings into binary form? For example hexadecimal strings that contain MD5 hashes. S.

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[boost] [serialization] New Primitive Types
by Andy Tompkins 26 Nov '07

26 Nov '07

Hi, If I create a new class, my_class, am I allowed to mark it as follows: BOOST_CLASS_IMPLEMENTATION ( my_class , boost::serialization::primitive_type ) The comments in level.hpp say that it won't call serialization code, thus I believe (and experience) that I don't need to provide either: template<class Archive> void my_class::serialize(Archive &ar, const unsigned int version) or template<class Archive> void serialize(Archive &ar, my_class &t, const unsigned int version) The comments also say that 'It presumes a member function or template in the archive class that can handle this type.' Does this mean that current archives (text, xml, and binary) are not able to use new primitive types without altering the archive to handle the new primitive? As I try it, both the text and xml archives use stream operators to convert my_class to a string and archive that. The binary archive casts my_class to a void* and outputs sizeof(my_class) bytes to the archive. It this expected behavior? Thanks, Andy.

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Problem in using graphml.cpp..
by abhishek.v＠tcs.com 26 Nov '07

26 Nov '07

Hi I m trying to extract a graph by reading out graphml. For this purpose i'm making using of graphml.cpp and graphml.hpp also i have included "expat" libraries required for this. But when i'm trying to compile this it gives the following error :- Executing make... make.exe -f "C:\Dev-Cpp\graphml\Makefile.win" all g++.exe -D__DEBUG__ -c ../../boost_1_34_1/libs/graph/src/graphml.cpp -o ../../SRLGrp/BoostLib/boost_1_34_1/libs/graph/src/graphml.o -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include" -I"C:/Dev-Cpp/include/c++/3.4.2/backward" -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32" -I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include" -I"C:/Dev-Cpp/graphml" -I"C:/SRLGrp/BoostLib/expat-2.0.1/lib" -I"C:/SRLGrp/BoostLib/boost_1_34_1" -I"C:/SRLGrp/BoostLib/expat-2.0.1" -pg -g3 In file included from ../../SRLGrp/BoostLib/boost_1_34_1/libs/graph/src/graphml.cpp:14: C:/SRLGrp/BoostLib/boost_1_34_1/boost\graph\graphml.hpp: In function `void boost::write_graphml(std::ostream&, const Graph&, VertexIndexMap, const boost::dynamic_properties&, bool)': C:/boost_1_34_1/boost\graph\graphml.hpp:259: error: missing terminating " character C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: `xmlns' undeclared (first use this function) C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: (Each undeclared identifier is reported only once for each function it appears in.) C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: expected `;' before ':' token C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: stray '\' in program C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: missing terminating " character C:/boost_1_34_1/boost\graph\graphml.hpp:261: error: stray '\' in program C:/boost_1_34_1/boost\graph\graphml.hpp:261: error: missing terminating " character C:/boost_1_34_1/boost\graph\graphml.hpp:288: error: `value_types' undeclared (first use this function) C:/boost_1_34_1/boost\graph\graphml.hpp:288: error: template argument 1 is invalid C:/boost_1_34_1/boost\graph\graphml.hpp:289: error: template argument 1 is invalid C:/boost_1_34_1/boost\graph\graphml.hpp:289: error: template argument 1 is invalid C:/boost_1_34_1/boost\graph\graphml.hpp:289: error: no matching function for call to `for_each(<type error>)' In file included from ../../boost_1_34_1/libs/graph/src/graphml.cpp:14: C:/boost_1_34_1/boost\graph\graphml.hpp:369:34: warning: no newline at end of file What could be the reason for this. Right now i m only trying to compile the code avaliable on boost website. Thanks Abhishek Vyas ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

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Threads
by Rij 26 Nov '07

26 Nov '07

Hello, I am having problems with running a threads program and was windering if someone could help. I have the following 3 files. 1) example.h class example{ public: example(); virtual ~example(); void operator()(); void someOtherFn(); }; 2) example.cc #include "example.h" C_example::C_example() { } C_example::~C_example() { } void C_example::operator()() { cout << "I'm thread\n"; } 3) main.cc #include <boost/thread/thread.hpp> #include "example.h" int main(int argc, char* argv[]) { example e; boost::thread t1(e); t1.join(); return 0; } I have compiled this and linked with: -lboost_thread-gcc-mt When I run it, I get the following error: terminate called after throwing an instance of 'boost::thread_resource_error' what(): boost::thread_resource_error Abort (core dumped) Any help please?

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[boost-users] assigning pointer of vector.
by chun ping wang 26 Nov '07

26 Nov '07

Hi, since ptr_vector are non copyable, how would i got baout making assignment from one ptr_vector to another.. i.e. ptr_vector<Foo> t; ptr_vector<Foo> t2; // some coding. t = t2;

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