November 2007 - Boost-users

Copy from stream to vector
by Ricardo Mayerhofer 10 Nov '07

10 Nov '07

Hi all, I've started to use boost 1 month ago and I'm findind it very helpful indeed. Congratulations for the good job. I have one question, is it possible to use boost to copy from a stream to a container? If so, how do I? eg. with std copy: copy( istream_iterator<string>(FileSource), istream_iterator<FileSource> (), back_inserter( m_StringVector ) ) I wonder if boost copy would make it simpler, but I was not able to use it. It pops up a static assertion failure :( Any help? Thanks. Ricardo

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Re: [Boost-users] [asio] Problems with Boost.System
by Damjan Miklic 10 Nov '07

10 Nov '07

I have solved my problem by downloading the latest version of Boost from the subversion repository. With this version, i could build the System library and link the Asio Timer examples. I was wondering whether this is the recommended solution and whether the System library is officially a part of Boost 1.34.1, as there is no information on it in the online docs http://www.boost.org/libs/libraries.htm Best regards, Damjan Miklic Damjan Miklic wrote: > Thaks for the quick reply. Unfortunately i still can't compile the > system library. My default installation doesn't even have a > > libs\system > > folder. I have downloaded system-0.2.1.zip from the boost vault and > copied the 'system' folder to > > boost_1_34_1\libs > > but running > > bjam --toolset=msvc --with-system > > results with the same error: > > wrong library name 'system' in the --with-<library> option. > > Running bjam in > > boost\libs\system\build > > gives a lengthy error message and doesn't seem to build anything. > > Further assistance would be appreciated. > > Best regards, > > Damjan Miklic > > > Simon Pickles wrote: >> Hi, I had this problem recently. >> >> I had to abandon the stage argument and just use: >> >> bjam --toolset=msvc --with-system >> >> or alternatively, just build the system part by running bjam in: >> >> boost\libs\system\build >> >> like this: >> >> bjam --toolset=msvc threading=multi link=static >> >> >> Good luck! >> >> Simon >> >> >> >> Damjan Miklic wrote: >>> Hi, >>> >>> I am running into some problems when trying to build a simple >>> Asio program (the Timer2 tutorial) with MSVC 8.0. I have >>> installed Boost using the installer from Boost Consulting and >>> copied the Asio headers to the boost_1_34_1\boost directory. The >>> program compiles (with three warnings about deprecated unsafe >>> functions in asio headers) but linking fails with the error: >>> >>> fatal error LNK1104: cannot open file >>> 'libboost_system-vc80-mt-sgd-1_34_1.lib' >>> >>> I have tried building Boost.System with the command: >>> >>> bjam --with-system stage >>> >>> according to the instructions found on: >>> >>> http://asio.sourceforge.net/boost_asio_0_3_8/libs/asio/doc/html/boost_asio/… >>> >>> >>> >>> but i get the following error: error: wrong library name 'system' >>> in the --with-<library> option. >>> >>> I have searched the Boost website and mailing list archives but >>> couldn't find any further information on building the System >>> library. >>> >>> Any help in resolving this problem will be greatly appreciated. >>> >>> Best Regards, >>> >>> Damjan Miklic >>>

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copy(unit_vector.begin(), unit_vector.end(), vector.begin())
by e r 10 Nov '07

10 Nov '07

hi all, i'm trying to assign a unit vector into a vector. i get puzzling results: v[3](0,0,0)//initial uv1[3](1,0,0) v[3](1,0,0) uv2[3](0,1,0) v[3](1,0,0)//should be (0,1,0) uv3[3](0,1,0) v[3](1,0,0)//should be (0,0,1) for the code below. i must be missing something obvious...what is it? #include <boost/numeric/ublas/vector.hpp> #include <boost/numeric/ublas/io.hpp> int main(){ using namespace boost::numeric::ublas; unsigned int D = 3; unit_vector<unsigned int> uv1(D,0); unit_vector<unsigned int> uv2(D,1); unit_vector<unsigned int> uv3(D,2); vector<unsigned int> v(D); std::cout << "v" << v << std::endl; copy(uv1.begin(),uv1.end(),v.begin()); std::cout << "uv1" << uv1 << std::endl; std::cout << "v" << v << std::endl; copy(uv2.begin(),uv2.end(),v.begin()); std::cout << "uv2" << uv2 << std::endl; std::cout << "v" << v << std::endl; copy(uv3.begin(),uv3.end(),v.begin()); std::cout << "uv3" << uv2 << std::endl; std::cout << "v" << v << std::endl; return 0; };

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link error using boost serialization library
by Y Fang 10 Nov '07

10 Nov '07

Hi, I am trying to use boost serialization library, but run into link errors that I don't know how to resolve. I created a very simple data structure with a 'string' and 'int' in it. Then I try to serialize it to a stringstream and recover from a stringstream. The compile failed during linking. The first few errors are: % make g++ -O0 -g3 -Wall -D_REENTRANT -pthread -lboost_program_options -lboost_filesystem -lboost_iostreams -lboost_thread -lboost_regex -lboost_serialization -lpthread -o a.out main.o SimpleData.o main.o: In function `boost::archive::text_oarchive& boost::smart_cast_impl::reference<boost::archive::text_oarchive&>::polymorphic::cross::cast<boost::archive::detail::basic_oarchive>(boost::archive::detail::basic_oarchive&)': /usr/include/boost/smart_cast.hpp:76: undefined reference to `typeinfo for boost::archive::detail::basic_oarchive' main.o: In function `void boost::archive::save_access::save_primitive<boost::archive::text_oarchive, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::archive::text_oarchive&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': /usr/include/boost/archive/detail/oserializer.hpp:91: undefined reference to `boost::archive::detail::basic_oarchive::end_preamble()' /usr/include/boost/archive/detail/oserializer.hpp:92: undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' main.o: In function `void boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save<int>(int const&)': /usr/include/boost/archive/text_oarchive.hpp:53: undefined reference to `boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::newtoken()' main.o: In function `void boost::archive::save_access::save_primitive<boost::archive::text_oarchive, int>(boost::archive::text_oarchive&, int const&)': /usr/include/boost/archive/detail/oserializer.hpp:91: undefined reference to `boost::archive::detail::basic_oarchive::end_preamble()' main.o: In function `void boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save<boost::archive::class_id_reference_type>(boost::archive::class_id_reference_type const&)': /usr/include/boost/archive/text_oarchive.hpp:53: undefined reference to `boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::newtoken()' ...... I attached the source code of the 4 files I use: main.cpp, SimpleData.h, SimpleData.cpp, and Serialize.cpp. Also, here is the g++ version I use: % g++ -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-checking=release i486-linux-gnu Thread model: posix gcc version 4.1.2 (Ubuntu 4.1.2-0ubuntu4) Is there something I missed in the include list? I tried '#include <boost/archive/detail/basic_oarchive.hpp>' in Serialize.h file, that would trigue compile error even before linking. Thanks, Yu main.cpp: #include <string> #include <iostream> #include "SimpleData.h" #include "Serialize.h" int main () { // test serialization of data structure SimpleData sd("hello", 1); std::string sdstr = saveData<SimpleData>(sd); std::cout << "Serialized simple data is:\n" << sdstr << std::endl; return 0; } SimpleData.h: #ifndef SIMPLEDATA_H_ #define SIMPLEDATA_H_ #include <string> class SimpleData { public: SimpleData(); SimpleData(std::string id_, int code_); virtual ~SimpleData(); std::string id; int code; }; #endif /*SIMPLEDATA_H_*/ SimpleData.cpp: #include "SimpleData.h" SimpleData::SimpleData () { id = "default"; code = 0; return; } SimpleData::SimpleData (std::string id_, int code_) : id(id_), code(code_) { return; } SimpleData::~SimpleData () { return; } Serialize.h: #ifndef SERIALIZE_H_ #define SERIALIZE_H_ #include <sstream> #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/string.hpp> #include "SimpleData.h" namespace boost { namespace serialization { // add a serialize function below for each data structure that needs // to be serialized // serialize simple data template<class Archive> void serialize (Archive & _ar, SimpleData & _sd, const unsigned int _version) { _ar & _sd.id; _ar & _sd.code; } } } // serialize data structure and save into a string // note: there must be a serialize function defined // above for the data structure template<class Data> std::string saveData (const Data& _d) { std::ostringstream oss; boost::archive::text_oarchive oa(oss); oa << _d; return oss.str(); } // deserialize and recover data structure from a string template<class Data> Data loadData (const std::string& _s) { std::istringstream iss(_s); boost::archive::text_iarchive ia(iss); Data d; ia >> d; return d; } #endif /*SERIALIZE_H_*/

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[date_time] absolute value for time_duration?
by Michael Fawcett 09 Nov '07

09 Nov '07

What is the best way to ensure that one has a positive time_duration? I'm dealing with hundreds of thousands of data points and need to gather the points that are temporally near a given time (based on a duration). For example, find all points in the collection that are within 1 hour of Feb 2, 5:00pm. I used the following code to verify that simply multiplying by -1 would give the desired result, but it would probably be nicer to provide a std::abs overload. boost::posix_time::ptime lhs1(boost::gregorian::date(2007, 2, 1), boost::posix_time::hours(1)); boost::posix_time::ptime rhs1(boost::gregorian::date(2007, 2, 2), boost::posix_time::hours(1)); boost::posix_time::time_duration elapsed1 = lhs1 - rhs1; elapsed1 *= -1; boost::posix_time::ptime lhs2(boost::gregorian::date(2007, 2, 2), boost::posix_time::hours(1)); boost::posix_time::ptime rhs2(boost::gregorian::date(2007, 2, 1), boost::posix_time::hours(1)); boost::posix_time::time_duration elapsed2 = lhs2 - rhs2; assert(elapsed1 == elapsed2); and the actual code is something like (where duration would be 1 hour in this example): boost::posix_time::time_duration elapsed = pt.timestamp - rhs.timestamp; if (elapsed.is_negative()) elapsed *= -1; return elapsed <= duration; I realize that one could also use std::max and std::min, but that seems a bit inefficient, especially since this is a very performance critical area of our application. Thanks, --Michael Fawcett

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Derive from adjacency_list
by Olivier Tournaire 09 Nov '07

09 Nov '07

Hi all, I want to derive a class from adjacency_list : template <class NodesContainer = boost::vecS, class EdgesContainer = boost::vecS, class Directed = boost::undirectedS, class NodesAttributes = boost::no_property, class EdgesAttributes = boost::no_property > class BGL_Graph : public boost::adjacency_list<NodesContainer, EdgesContainer, Directed, NodesAttributes, EdgesAttributes > { /// ... many typedefs /// ... }; I also have an other derived class from BGL_Graph : class MPPRectangleGraph : public BGL_Graph<boost::vecS,boost::vecS,boost::undirectedS,MPPRectangleGraphNode,Weight> { public: MPPRectangleGraph() {is_init_ = false;}; ~MPPRectangleGraph(); void InitDisplay(std::string name = "MPP", unsigned int width = 200, unsigned int height = 200); void Draw( unsigned int flags = DRAW_NOTHING); void Display( unsigned int flags = DRAW_NOTHING ); protected: private: bool is_init_; IdFenetreCalques window_; IdCalqueVecteur layer_rectangle_; IdCalqueVecteur layer_profiles_; IdCalqueVecteur layer_neighborhood_; IdCalqueVecteur layer_edges_; }; My problem is how can I iterate on the edges in a method of MPPRectangleGraph ? void MPPRectangleGraph::Draw( unsigned int flags ) { // On recupere les differents flags d'affichage bool draw_rect = false, draw_profiles = false, draw_neighborhood = false, draw_edges = false; if ( flags&DRAW_RECTANGLE ) draw_rect = true; if ( flags&DRAW_PROFILES ) draw_profiles = true; if ( flags&DRAW_NEIGHBORHOOD ) draw_neighborhood = true; if ( flags&DRAW_EDGES ) draw_edges = true; // On vide tous les calques layer_rectangle_.Clear(); layer_profiles_.Clear(); layer_neighborhood_.Clear(); layer_edges_.Clear(); // On fait l'affichage en fonction des flags recuperes // Les aretes MPPRectangleGraph::edge_iterator first, last; for(boost::tie(first, last)=edges(this);first!=last;++first) // does not work ! { //std::cout << boost::source(*first, g) << " to " << boost::target(*first, g) << " = "; } } Regards -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.

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Invoke Bjam on the Command Line
by chandra_india＠webdunia.com 09 Nov '07

09 Nov '07

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macro redefinition errors
by Vivek Nallur 09 Nov '07

09 Nov '07

Hi, My project uses boost 1.34.1 libraries for asio and also includes windows.h (which in turn includes winsock.h). This results in a macro redefinition error for FD_SETSIZE and then goes on to spew a bucketload of related errors. The easiest way to reproduce this is to have a simple main.cpp with just: #include<boost/asio.hpp> #include<windows.h> int main() { return 0; } Any ideas on what I'm doing wrong? Or what I could try? I've tried defining WIN32_LEAN_AND_MEAN, IPPROTO_V6 in the makefile, but to no avail. I'm using VC 8 on a windows XP. ======================== My comand line looks like this: C:\perforce\some\path\>make main.o -- Compile main.cpp... c:/perforce/toolchain/win32/winsdk-6.1.6000/VC/bin/cl.exe -nologo -Fdc:/perforce/some/path somelib.pdb -Gm -EHsc -c -Zi -TP -GR -D_WIN32 -D_USRDLL -D_WIN32_WINNT -DWINVER=0x0600 -D_WINDLL -D_MBCS -W3 -D_CRT_NO NSTDC_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -DUSERLEVEL -MDd -Od -D_DEBUG -RTC1 -I"C:\perforce\toolchain\win32\boost-1.34.1\include" -Ic:/perforce/toolchain/win32/winsdk-6.1.6000/Include -Ic:/perforce/toolchain/win32/winsdk-6.1.6000/VC/include -Ic:/perforce/toolchain/win32/winsdk-6.1.6000/VC/PlatformSDK/Include And the error message looks like: C:\perforce\toolchain\win32\boost-1.34.1\include\boost/asio/detail/socket_types.hpp(44) : warning C4005: 'FD_SETSIZE' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(65) : see previous definition of 'FD_SETSIZE' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(91) : warning C4005: 'AF_IPX' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(460) : see previous definition of 'AF_IPX' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(116) : warning C4005: 'AF_MAX' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(479) : see previous definition of 'AF_MAX' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(163) : warning C4005: 'SO_DONTLINGER' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(402) : see previous definition of 'SO_DONTLINGER' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(206) : error C2011: 'sockaddr' : 'struct' type redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(485) : see declaration of 'sockaddr' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(384) : error C2143: syntax error : missing '}' before 'constant' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(437) : error C2143: syntax error : missing ';' before '}' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(437) :error C4430: missing type specifier - int assumed. Note: C++ does not support default-int ========================

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[bind] binding templated operator with vs 7.1
by MOSS Sebastian 09 Nov '07

09 Nov '07

Hi, I'm having trouble with the following design with vs 7.1 and wondering if anyone could offer a workaround. Particularly it seems that the ".template operator" syntax isn't liked. (This works on gcc 4.0.3). Removing the 'template' keyword from the bind arguments gives an error novel. Any ideas would be warmly welcomed! s #include <boost/bind.hpp> #include <boost/function.hpp> #include <iostream> class tmpl_operator { public: template <typename T> void operator&( const T& rhs ) const { // do stuff std::cout << rhs; } }; template <class T, class bound> class command { public: command( T& obj, bound& instance ) : _instance(instance) { // works with gcc (4.0.3) but not cl (7.1): apply = boost::bind(&bound::template operator&<T>, instance, obj); // doesn't compile in vs: //_instance.template operator&<T>(obj); // this compiles in vs though: // _instance.operator&<T>(obj); } void execute() { apply(); } private: bound _instance; boost::function<void (void)> apply; }; int main() { double dbl = 2.71; tmpl_operator instance; command<double,tmpl_operator> test(dbl,instance); test.execute(); } ******************************* This e-mail contains information for the intended recipient only. It may contain proprietary material or confidential information. If you are not the intended recipient you are not authorised to distribute, copy or use this e-mail or any attachment to it. Murex cannot guarantee that it is virus free and accepts no responsibility for any loss or damage arising from its use. If you have received this e-mail in error please notify immediately the sender and delete the original email received, any attachments and all copies from your system.

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[Boost Users] Serialization -- serializing a map with shared_ptr values
by Oliver Kania 09 Nov '07

09 Nov '07

I have the following two data structures: std::map<const std::string, boost::shared_ptr< C >, jedox::util::CaseInsensitiv > m_LookupName; std::map<unsigned int, boost::shared_ptr< C > > m_LookupId; Before serialization, the shared pointer - values of the maps do point to sth. meaningful. Afterwards, however, they point to data-structures with meaningless content. The keys (strings / ints) are serialized / unserialized correctly. I guess its a general problem with serializing shared pointers contained in a std::map as values !? BTW: the structures the shared pointers point to do have a serialization method themselves and I a assume that it is called when serializing the map. I serialize / unserialize as follows: template<class Archive> void save( Archive &ar, unsigned int version) const{ m_offlineMode = true; bool oldCachedAll = m_CachedAll; m_CachedAll = true; ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; // 1st structure ar & m_LookupName; // 2nd structure ar & m_SequenceNumber; //reset old state for the case we want to continue working m_CachedAll = oldCachedAll; m_offlineMode = false; } template<class Archive> void load( Archive &ar, unsigned int version) { ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; ar & m_LookupName; ar & m_SequenceNumber; //reset old state for the case we want to continue working } kind regards, Oliver

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