April 2010 - Boost-users - lists.boost.org

Visual Studio 2009 and BOOST_NO_MEMBER_TEMPLATE_FRIENDS
by Daniel Bradburn 06 Apr '10

06 Apr '10

I have just upgraded a project from Visual Studio 2005 to 2008 and suddenly I am getting compile errors using boost::multi_index: error C2247: 'boost::multi_index::detail::random_access_index<SuperMeta,TagList>::operator []' not accessible because 'boost::multi_index::detail::ordered_index<KeyFromValue,Compare,SuperMeta,TagList,Category>' uses 'protected' to inherit from 'boost::multi_index::detail::random_access_index<SuperMeta,TagList>' I figure that this is to do with the BOOST_MULTI_INDEX_PROTECTED_IF_MEMBER_TEMPLATE_FRIENDS define, so I tried changing #if _MSC_VER <= 1400 // 1400 == VC++ 8.0 # define BOOST_NO_MEMBER_TEMPLATE_FRIENDS #endif to #if _MSC_VER <= 1500 // 1500 == VC++ 9.0 # define BOOST_NO_MEMBER_TEMPLATE_FRIENDS #endif in visualc.hpp which fixes the compile error. Is this a bug with the visualc.hpp config in boost? I can't believe I would be the first to spot it. Has anyone else experienced this? Are member template friends actually supported in visual c++ 9? _________________________________________________________________ Download gratis emoticons voor Messenger http://www.rulive.nl/aspx/emoticons.aspx

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[Graph] Need help with Subgraph and adjacent_vertices.
by Marcus Fontaine 06 Apr '10

06 Apr '10

I'm having trouble finding the adjacent vertices in a subgraph, using the adjacent_vertices function. Although, it seems to work fine on a graph that isn't the subgraph of another. I'm using the g++ compiler, along with boost_1_37_0. The following code demonstrates the problem; the adjacent vertices to 4 in subG should be 2 and 3. However, I get 5 when I run the program. Any fixes or suggestions would be greatly appreciated. #include <iostream> #include <vector> #include <boost/config.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/subgraph.hpp> using namespace std; using namespace boost; typedef subgraph< adjacency_list<vecS, vecS, undirectedS, property<vertex_index_t, int>, property<edge_index_t, int> > > Graph; int main() { Graph G; add_edge(0, 1, G); add_edge(1, 2, G); add_edge(2, 3, G); add_edge(1, 5, G); add_edge(5, 6, G); add_edge(6, 8, G); add_edge(6, 7, G); add_edge(7, 8, G); add_edge(4, 2, G); add_edge(4, 3, G); add_edge(4, 6, G); Graph subG = G.create_subgraph(); add_vertex(1, subG); add_vertex(2, subG); add_vertex(3, subG); add_vertex(4, subG); add_vertex(7, subG); add_vertex(8, subG); graph_traits<Graph>::adjacency_iterator ai; graph_traits<Graph>::adjacency_iterator ai_end; cout << "Adjacent vertices of 4 in G: "; //Should be (and is): 2 3 6 for(tie(ai, ai_end) = adjacent_vertices(4, G); ai != ai_end; ++ai) { cout << *ai << " "; } cout << endl; //------------------------------------------------------------------------ cout << "Adjacent vertices of 4 in subG: "; //Should be (is not): 2 3 for(tie(ai, ai_end) = adjacent_vertices(4, subG); ai != ai_end; ++ai) { cout << *ai << " "; } cout << endl; return 0; }

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[serialization] error in boost_serialization of static variable
by ashish srivastava 06 Apr '10

06 Apr '10

Hello I am trying to serialize my main code using boost_serialization (attached is the small program I have written to extract my actual problem of how to serialize the static int class member variable). Without boost_serialization of static int variable the code is running fine. But when I try to serialize the static int variable in "Public" of linklist class I get the error (segmentation fault). I tried to use the "BOOST_STRONG_TYPEDEF" to wrap the "int" to "tracked_int" but the effort was in vain. Kindly help me. regards,ashish The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/

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[Spirit] compilation problem
by philip tucker 06 Apr '10

06 Apr '10

Hello, I have a simple Spirit parser program which won't compile. I am running boost 1_42_0 with gcc on a mac. The code and error message are attached. I hope you can tell me two things: first, what have I done wrong, and second (if necessary), how can I figure out what I've done wrong from the error message. Thanks again.

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[boost.asio] error Software caused connection abort
by imin imup 06 Apr '10

06 Apr '10

Hello, When I use a tcp socket to connect to remote host, I may get an "actively refused" or "time out" error in 1st time. That's normal. Then when I retry to connect to remote host, I "always" got "Software caused connection abort" error for every rtrial. It seems a programming issue. Could anyone explain what this error mean and how to avoid it? or point me to some document? Thanks Imin

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Property maps hierarchy compilation errors
by ostroganov 05 Apr '10

05 Apr '10

Hi, I want to create hierarchy of property maps like this: #include <boost/graph/adjacency_list.hpp> #include <boost/property_map/property_map.hpp> using namespace boost; struct Base_NodeP { int basic_property; }; struct NodeP : public Base_NodeP { // using Base_NodeP::basic_property int derived_property; }; int main(){ typedef adjacency_list<setS, vecS, undirectedS, property<vertex_index_t,int,NodeP>, no_property> TGraph; property_map<TGraph, int NodeP::*>::type _basic_property; property_map<TGraph, int NodeP::*>::type _derived_property; TGraph tgraph; _derived_property = get(&NodeP::derived_property, tgraph); _basic_property = get(&NodeP::basic_property, tgraph); return 0; } When I compile this code in MSVS 2008, I'm getting error C2679: binary '=' : no operator found which takes a right-hand operand of type 'boost::bundle_property_map<Graph,Descriptor,Bundle,T>' (or there is no acceptable conversion). gcc 4.3.2 gives similar error: error: no match for ‘operator=’ in ‘_basic_property = boost::get [with OutEdgeListS = boost::setS, VertexListS = boost::vecS, DirectedS = boost::undirectedS, VertexProperty = boost::property<boost::vertex_index_t, int, NodeP>, EdgeProperty = boost::no_property, GraphProperty = boost::no_property, EdgeListS = boost::listS, T = int, Bundle = Base_NodeP](&Base_NodeP::basic_property, ((boost::adjacency_list<boost::setS, boost::vecS, boost::undirectedS, boost::property<boost::vertex_index_t, int, NodeP>, boost::no_property, boost::no_property, boost::listS>&)(& tgraph))) When I uncomment "using Base_NodeP::basic_property" in NodeP declaration, MSVS is happy, but gcc still cannot compile the code. Do you have any suggestions, how can I make this code work under gcc? Am I doing something wrong? Thanks for any help, Oleg -- View this message in context: http://old.nabble.com/Property-maps-hierarchy-compilation-errors-tp28137714… Sent from the Boost - Users mailing list archive at Nabble.com.

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serialization unordered_map
by alev mutlu 05 Apr '10

05 Apr '10

I could not find any library for unordered_map? Is there one?

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serialization 1.42 problems with enable_shared_from_this ?
by Avi Bahra 05 Apr '10

05 Apr '10

Not quite sure what is going on here. I am serializing shared_ptr, that make use of derivation from enable_shared_from_this. However when my class is restored from disk, it appears that accessing shared_from_this() throws a tr1::bad_weak_ptr. Using boost 1.42, gcc 4.2.1, on suse linux. Has any one hit a similar issues, or found any work arounds ? Any help greatly appreciated. Here is some contrived standalone code, that demonstrate the problem. /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // =========== file Main.cpp =================== // After restoring a class via shared_ptr it // appears as if enable_shared_from_this has not // been honoured. When accessing shared_from_this() // I get tr1::bad_weak_ptr exception. #include <iostream> #include <fstream> #include <assert.h> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/vector.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/serialization/export.hpp> #include <boost/shared_ptr.hpp> #include <boost/enable_shared_from_this.hpp> using namespace std; using namespace boost; class Base : public boost::enable_shared_from_this<Base> , private boost::noncopyable { protected: Base() {} virtual ~Base() {} public: virtual const std::string& name() const = 0; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int){} }; typedef boost::shared_ptr<Base> base_ptr; class Derived : public Base { public: Derived(const std::string& name ) : Base(), name_(name){} Derived() {} virtual ~Derived() {} virtual const std::string& name() const { return name_;} base_ptr find(const std::string& name) const { if (name_ == name) { Derived* nonConstThis = const_cast<Derived*>(this); return nonConstThis->shared_from_this(); // throws after restore ? } return base_ptr(); } private: std::string name_; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & boost::serialization::base_object<Base>(*this); ar & name_; } }; typedef boost::shared_ptr<Derived> d_ptr; class Holder { public: Holder() {} void add(d_ptr b) { vec_.push_back(b);} base_ptr find(const std::string& name) const { for(size_t i=0; i < vec_.size(); i++){ base_ptr base = vec_[i]->find(name); if (base) return base; } return base_ptr(); } private: std::vector<d_ptr> vec_; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int){ ar & vec_; } }; void save(const Holder& holder, const char* filename) { std::ofstream ofs( filename ); boost::archive::text_oarchive oa( ofs ); oa << holder; } void restore(Holder& holder, const char* filename) { std::ifstream ifs( filename ); boost::archive::text_iarchive ia( ifs ); ia >> holder; } int main() { std::string fileName = "test.txt"; { Holder holder; holder.add( d_ptr(new Derived("me"))); holder.add( d_ptr(new Derived("you"))); base_ptr b = holder.find("me"); assert(b.get()); // works save(holder, fileName.c_str()); } Holder restored; restore(restored,fileName.c_str()); // why does the restored class throw // a weak ptr exception try { base_ptr b = restored.find("me"); // fails ? assert(b.get()); // never gets here } catch (std::exception& e) { std::cout << "Ooops exception " << e.what() << " thrown, test failed??? \n"; std::remove(fileName.c_str()); return 1; } std::remove(fileName.c_str()); cout << "test passed\n"; } Best regards, Ta, Avi

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[posix_time] time_duration operator/() overload
by Norbert Wenzel 04 Apr '10

04 Apr '10

Hello, I use boost::posix_time a lot in my code and I really do appreciate the library. But there's one thing I was recently missing when comparing time_durations to each other. double time_duration::operator/(time_duration); From my point of view this is a perfectly valid operation (as opposed to operator*(time_duration)) that returns the proportion of the two durations. I need that operation to compute statistics like "n% of the time I did x" or similar. What I'm currently doing is computing the proportions via time_duration::total_*() which works fine, but leads to some coding effort, since I'll have to cast one result to a real number to avoid integer division and some checks to prevent /0. I assume I'm not the first to compare time_durations so I was wondering if there was a reason operator/() is not overloaded for time_duration? Or if there is generally a better way to compare two durations? thanks, Norbert

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[Spirit] simplified struct.cpp coredumps
by philip tucker 04 Apr '10

04 Apr '10

Hello, I have a Spirit program that fails with a segmentation fault and I can't see why. I hope you can help. I'm starting from a simplified version of struct.cpp, known to work. I want to abstract the identifier grammar into its own struct and use that instead of the inline grammar for an identifier. The problem code is attached. What have I done wrong? Thanks as always for your patient, expert, and helpful comments. P.S. I'm running boost_1_42_0 with gcc -v: Using built-in specs. Target: i686-apple-darwin9 Configured with: /var/tmp/gcc_42/gcc_42-5574~1/src/configure -- disable-checking --enable-werror --prefix=/usr --mandir=/usr/share/ man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^ [cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple- darwin9 --with-gxx-include-dir=/usr/include/c++/4.0.0 --host=i686- apple-darwin9 --target=i686-apple-darwin9 Thread model: posix gcc version 4.2.1 (Apple Inc. build 5574) on Model Name: iMac Model Identifier: iMac9,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.66 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 6 MB Memory: 2 GB Bus Speed: 1.07 GHz Boot ROM Version: IM91.008D.B08 SMC Version (system): 1.44f0 P.S.S If you want the coredump, let me know.

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