July 2009 - Boost-users - lists.preview.boost.org

Serialization with pointer to const object
by Soumen 31 Jul '09

31 Jul '09

Hi, I'm using gcc 4.2.2 and boost 1.35. If I try to serialize pointer to some const objects, I'm getting compilation problem. Is there any limitation? Or I need to do certain things differently? I couldn't figured any solution over net. If there already exist any topic which points to solution, please point me to that. Otherwise, guide me to resolve the problem at hand. I'm new to boost. Say, my data member in the class myClass is const myType *ptr; In the serialize() routine, I'm doing it in following way: template< class Archive > void myClass::serialize(Archive &ar, const unsigned int version) { ar & ptr; // I've tried "ar & const_cast< myType* >(ptr)" and // "ar & (myType *) ptr" as well - it didn't work /* serialize other members */ } Regards, - Soumen -- View this message in context: http://www.nabble.com/Serialization-with-pointer-to-const-object-tp24639258… Sent from the Boost - Users mailing list archive at Nabble.com.

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Boost Serialization: undefined reference to `__assert'
by Kesseli Pascal 31 Jul '09

31 Jul '09

Hello everyone Today, I just happened to download the latest version of cygwin, including gcc 3.4.4. While a simple hello world works perfectly fine, trying to compile this code using a statically linked libserialization.a results in dozens of linker errors, all stating "undefined reference to `__assert'". #include <boost/assign/list_of.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/lambda/lambda.hpp> #include <boost/serialization/vector.hpp> #include <iostream> #include <fstream> using namespace boost::lambda; using namespace boost::assign; using namespace boost::archive; using namespace boost::serialization; using namespace std; int main() { { vector<string> v = list_of("123")("Boost")("Serialization"); ofstream ofs("test.xml"); xml_oarchive oxml(ofs); oxml << make_nvp("VectorTest", v); } { vector<string> v; ifstream ifs("test.xml"); xml_iarchive ixml(ifs); ixml >> make_nvp("VectorTest", v); for_each(v.begin(), v.end(), cout << _1 << "\n"); } return 0; } Is this a problem or known issue when using cygwin? I'm using eclipse in addition, by the way. The code works perfectly fine on other platforms, so I imagine it must be a problem when using the serialization library with cygwin. Thanks in advance for any help you can offer me here and best regards Pascal Kesseli

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BGL and threaded graph modification
by Sebastian Weber 31 Jul '09

31 Jul '09

Hi! I am wondering if it is possible to modify a single graph object by multiple threads which attach edges into seperated regions of the graph? To be exact: I have a set of vertices in my graph with index 0-maxIndex which I want to copy a couple of times into that same graph structure one after another. Of course, I assure that there are no resize events during copying and no overlapping. This should be possible, I think, at least in theory, but I found no word about that in the docs of the BGL. So, should it work or not? Thanks, Sebastian

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left shift count >= width of type
by Maróy Ákos 31 Jul '09

31 Jul '09

Hi, In boost-1_39/boost/date_time/filetime_functions.hpp at line 101 I always get the following warning when using gcc 3 with mingw: boost-1_39/boost/date_time/filetime_functions.hpp:101: warning: left shift count >= width of type can this be averted somehow? interestingly, if I add the above code in a simple function, no warning occurs. but, if I add the above code into a function template (as it is in the boost include file), I do get the warning. so something like: template< typename T > void foo() { /* shift is difference between 1970-Jan-01 & 1601-Jan-01 * in 100-nanosecond intervals */ const uint64_t c1 = 27111902UL; const uint64_t c2 = 3577643008UL; // issues warning without 'UL' const uint64_t shift = (c1 << 32) + c2; } will result in a warning, without the template, it does not. Akos

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[Date_Time] representing simulation time
by Pedro Martinez 31 Jul '09

31 Jul '09

I am working on a project where we are considering the use of Boost.Date_Time. We are already using other Boost libraries --so many thanks for Boost.Spirit! One of our requirements is to be able to run simulations, and so we need a clock that can be stopped/started/accelerated. Is there a mechanism for this in Boost.Date_Time? >From the documentation, I can't find one. >From the source code, it seems we could use boost::date_time::*_clock classes to derive our own classes that could provide simulation time. Is this the way the library is meant to be used? thank you for your time, Pedro unclassified ------------------------------------------------------------------------------------------------------------ Disclaimer: If you are not the intended recipient of this email, please notify the sender and delete it. Any unauthorized copying, disclosure or distribution of this email or its attachment(s) is forbidden. Thales Nederland BV will not accept liability for any damage caused by this email or its attachment(s). Thales Nederland BV is seated in Hengelo and is registered at the Chamber of Commerce under number 06061578. ------------------------------------------------------------------------------------------------------------

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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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