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zerobugs
by Caligula 31 Jul '09

31 Jul '09

Hi, In the zerobugs debugger, how Can I set a home directory so that I don't have to go through a long path every time I load a program? Setting the "HOME" variable does not seem to work. Also How can I run a program in zerobugs that I normally run on command line as: $ abc < in.xml > out.xml ? Thanks Caligula

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[python] ImportError undefined symbol
by Brian Budge 30 Jul '09

30 Jul '09

Hi all - I'm not much of a python guru, in fact our resident guru is out on maternity :) I'm hoping someone might tell me what is going on and how to get around it. We're using boost python, and have created a plugin = libMyPlugin. libMyPlugin links to libuuid and to libOtherLib. Our python test script is pretty simple and looks like this: import libMyPlugin from libMyPlugin import DoStuff but I get an error like this: ImportError: libOtherLib.so: undefined symbol: uuid_generate libOtherLib uses the symbol uuid_generate, but ldd reveals that it does NOT link against libuuid. ldd shows that libMyPlugin links against libuuid and libOtherLib. Can anyone explain (a) why this is happening and (b) how to fix it? Thanks, Brian

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Junctions on NTFS
by Thomas Voigt 30 Jul '09

30 Jul '09

Hi, we started using junctions to some degree, and it is rather unfortunate that boost doesn't support junctions (boost::filesystem_is_symlink will always return false on NTFS filesystems). We are using 1.38. https://svn.boost.org/trac/boost/ticket/1681 has a patch, is there a specific reason why this patch didn't make it to stable version? tv

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Boost.Date_time and leap seconds
by Andrzej Krzemienski 30 Jul '09

30 Jul '09

Hi, Does Boost.Date_Time support leap seconds? The documentation does not say it clearly enough, and it implies both answers: + The Motivation section says that we should prefer Boost.DateTime to other time libraries, because other libraries don't support leap seconds. + The documentation and function names often mention "UTC" or "universal", which by definition supports leap seconds. - The name "Posix Time" implies no support for leap seconds. At least this is what Wikipaedia says. - The rationale at the end says that leap seconds would be difficult to implement. - My experiments with simple ptime subtraction suggest no leap second support. I am really confused. Regards, &rzej

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Error compiling adjacency_matrix.
by Gerard Guerrero 30 Jul '09

30 Jul '09

Hello everyone, I'm learning how to use adjacency_matrix to create dense graphs for my image processing PFC, and I've spent a couple of days stuck with the following compilation error. **** Build of configuration Debug for project BGL_proves **** make all Building file: ../src/BGL_proves.cpp Invoking: GCC C++ Compiler g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/BGL_proves.d" -MT"src/BGL_proves.d" -o"src/BGL_proves.o" "../src/BGL_proves.cpp" In file included from /usr/include/c++/4.3/ext/hash_set:64, from /usr/local/include/boost/graph/adjacency_list.hpp:22, from ../src/BGL_proves.cpp:12: /usr/include/c++/4.3/backward/backward_warning.h:33:2: warning: #warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated. ../src/BGL_proves.cpp: In function ‘int main()’: ../src/BGL_proves.cpp:54: error: no matching function for call to ‘boost::adjacency_matrix<boost::undirectedS, boost::no_property, boost::property<boost::edge_weight_t, float, boost::no_property>, boost::no_property, std::allocator<bool> >::adjacency_matrix(main()::Edge [21], main()::Edge*, int&, double [21])’ /usr/local/include/boost/graph/adjacency_matrix.hpp:599: note: candidates are: boost::adjacency_matrix<Directed, VertexProperty, EdgeProperty, GraphProperty, Allocator>::adjacency_matrix(typename std::vector<typename boost::mpl::if_<typename boost::has_property<typename boost::detail::retag_property_list<boost::edge_bundle_t, EdgeProperty>::type>::type, std::pair<bool, typename boost::detail::retag_property_list<boost::edge_bundle_t, EdgeProperty>::type>, char>::type, typename Allocator::rebind<typename boost::mpl::if_<typename boost::has_property<typename boost::detail::retag_property_list<boost::edge_bundle_t, EdgeProperty>::type>::type, std::pair<bool, typename boost::detail::retag_property_list<boost::edge_bundle_t, EdgeProperty>::type>, char>::type>::other>::size_type) [with Directed = boost::undirectedS, VertexProperty = boost::no_property, EdgeProperty = boost::property<boost::edge_weight_t, float, boost::no_property>, GraphProperty = boost::no_property, Allocator = std::allocator<bool>] /usr/local/include/boost/graph/adjacency_matrix.hpp:472: note: boost::adjacency_matrix<boost::undirectedS, boost::no_property, boost::property<boost::edge_weight_t, float, boost::no_property>, boost::no_property, std::allocator<bool> >::adjacency_matrix(const boost::adjacency_matrix<boost::undirectedS, boost::no_property, boost::property<boost::edge_weight_t, float, boost::no_property>, boost::no_property, std::allocator<bool> >&) ../src/BGL_proves.cpp:23: warning: unused variable ‘noms’ make: *** [src/BGL_proves.o] Error 1 The code that leaves this error is the following: #include <iostream> #include <boost/config.hpp> #include <boost/graph/adjacency_matrix.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graph_utility.hpp> #include <boost/graph/graph_traits.hpp> using namespace std; using namespace boost; int main() { //Crear vertexs i enllaços amb estructures fàcils d'utilitzar. enum imatges_e {A,B,C,D,E,F,G,N}; const char* noms = "ABCDEFG"; typedef std::pair<int, int> Edge; //Entrem enllaços. Edge edge_array[] = { Edge(A,B), Edge(A,C), Edge(A,D), Edge(A,E), Edge(A,F), Edge(A,G), Edge(B,C), Edge(B,D), Edge(B,E), Edge(B,F), Edge(B,G), Edge(C,D), Edge(C,E), Edge(C,F), Edge(C,G), Edge(D,E), Edge(D,F), Edge(D,G), Edge(E,F), Edge(E,G), Edge(F,G) }; //Entrem pesos dels enllaços. double weights[] = { 3.87317, 16.6444, 16.6504, 16.5974, 16.556, 16.542, 16.5325, 16.5393, 16.4867, 16.4469, 16.4323, 2.44883, 3.34502, 3.82632, 4.12945, 2.73509, 3.46093, 3.75471, 2.65915, 2.99527, 2.31493 }; int num_edges = sizeof(edge_array) / sizeof(Edge); typedef adjacency_list<vecS, vecS, undirectedS, no_property, property<edge_weight_t, float> > ALUGraph; ALUGraph ug (edge_array, edge_array+num_edges, weights, num_edges); typedef adjacency_matrix< undirectedS, no_property, property<edge_weight_t, float> > AMUGraph; AMUGraph ug2 (edge_array, edge_array + num_edges, num_edges, weights); Here I'm trying to create two versions of the graph. If I comment the construction of ug2 everything works fine, but if I leave it uncommented, the former error is generated. I've been googling for help but I've found nothing that could help me. Any help will be welcome!! Thanks in advance.

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mpl eval_if and has_member_data use
by Hicham Mouline 30 Jul '09

30 Jul '09

Hello, I have BOOST_HAS_STATIC_MEMBER_DATA(size_t, maxsize) // from introspection in sandbox template <typename T> class C { static const size_t s = boost::mpl::eval_if< boost::introspection::has_static_member_data_maxsize<T>, boost::mpl::size_t<T::maxsize>, boost::mpl::size_t<0> >::value; }; if T has maxsize size_t member, then s should get maxsize and if it doesn't, s should be 0. I get a compile error for cases where T doesn't have maxsize, because I still refer to it. e.g. of T struct Texample { ... static const size_t maxsize = 5; }; Regards,

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[Interprocess] Mapped file destructor
by Thomas d'Erceville 30 Jul '09

30 Jul '09

Hello, In my code I open a mapped file (previously created) and I construct an object inside, this object is valid and I can use it. But after the mapped_file has been destroyed my object is not valid anymore. It happens just after the call to the destructor of the mapped file. How can I tell to the Mapped File to do not flush its content when it is destructed? Best regards. Thomas

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boost::interprocess:basic_string : Capacity no more than 10
by samuel.gallard 30 Jul '09

30 Jul '09

Hello, I first present to you my code and I will explain my problem with the code . ShmString.h : namespace ip=boost::interprocess; typedef ip::allocator<char, ip::managed_shared_memory::segment_manager> CharAllocator; class ShmString : public ip::basic_string<char, std::char_traits<char>, CharAllocator > { public: ShmString (); virtual ~ShmString (); /** * The segment to build the string */ static ip::managed_shared_memory* st_segment; } This class served to have some string in memory. The following Element.h used it : class Element { public: Element (const std::string dir, const std::string type, ip::managed_shared_memory * segment); private: ShmString dir; ShmString file; ShmString type; ip::managed_shared_memory * segment; }; I have four attributes that declare it. When I tried to define all the attributes in the constructor like this in Element.cpp : Element::Element (const string dir, const string file, const string type, ip::managed_shared_memory *segment){ try{ this->dir.assign(dir.c_str()); this->file.assign(file.c_str()); } catch(ip::interprocess_exception &e){ ostringstream oss; const std::string what(e.what()); oss << "Class Element in constructor 1 -> "; oss << what; throw EventException(oss.str().c_str(), __LINE__ ); } } If for example "const string dir " has the size more than 10 (the capacity by default for a ShmString object), I obtained an error like this : x0807436f in boost::interprocess::basic_string<char, std::char_traits<char>, boost::interprocess::allocator<char, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index> > >::assign (this=0xb7428274, s=0xb9adf154 <Address 0xb9adf154 out of bounds>) I tried to used the other constructors by default for basic_string but it remains the same. This code only works when in the constructors the string size are below 10. Could you someone explain me why I obtain this? Do I have some faulty code? Could you provide some examples on how store string with interprocess::basic_string in shared memory for a size for more than 10 characters? I will be very grateful because I am lost... Thanks you in advance Regards Samuel -- View this message in context: http://www.nabble.com/boost%3A%3Ainterprocess%3Abasic_string-%3A-Capacity-n… Sent from the Boost - Users mailing list archive at Nabble.com.

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[format] Alternative syntax
by Emre Turkay 30 Jul '09

30 Jul '09

Hi folks, Any interest in the alternative syntax for boost::format? format2 f("Hello %s, %s"); std::cout << f("Joe", "Jane") << std::endl << f("Jose", "Mary") << std::endl; Which creates the output; Hello Joe, Jane Hello Jose, Mary Code is available at http://bit.ly/2J60Re for any suggessions. Take care, emre

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Fwd: Boost 1.38.0 Interprocess - Question on remove
by Federico Golfrè Andreasi 30 Jul '09

30 Jul '09

Hi! I'm using the Boost 1.38.0 Interprocess Library and shared memory object. My code eliminates with a remove a shared memory object associated with a label, the returned value is true so the operation is done correctly; just after that I create a shared memory with the same label and the program throws an error saying "File exists", just as I didn't remove it with the previous instruction. I've seen that the made a bug fix in boost 1.39.0 Interprocess Library on the remove; that fixing reagard this problem or is something different? Do you have an idea of what can be the problem? Thank you, Federico

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