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undefined reference to boost::filesystem
by Thibaut Lepage 18 Aug '12

18 Aug '12

Hello, I can't link against the filesystem library. When I try to compile a program using boost::filesystem (like the simple one attached to this email), I get "undefined reference" errors from the linker: dourak@Vvardenfell:~$ g++ -o dummy dummy.cpp -lboost_filesystem -lboost_system /tmp/ccMpl6cj.o: In function `boost::filesystem::exists(boost::filesystem::path const&)': dummy.cpp:(.text._ZN5boost10filesystem6existsERKNS0_4pathE[boost::filesystem::exists(boost::filesystem::path const&)]+0x19): undefined reference to `boost::filesystem::detail::status(boost::filesystem::path const&, boost::system::error_code*)' /tmp/ccMpl6cj.o: In function `boost::filesystem::path::path<char*>(char* const&, boost::enable_if<boost::filesystem::path_traits::is_pathable<boost::decay<char*>::type>, void>::type*)': dummy.cpp:(.text._ZN5boost10filesystem4pathC2IPcEERKT_PNS_9enable_ifINS0_11path_traits11is_pathableINS_5decayIS4_E4typeEEEvE4typeE[_ZN5boost10filesystem4pathC5IPcEERKT_PNS_9enable_ifINS0_11path_traits11is_pathableINS_5decayIS4_E4typeEEEvE4typeE]+0x22): undefined reference to `boost::filesystem::path::codecvt()' collect2: ld a retourné 1 code d'état d'exécution I carefully sorted the libraries in the command line, since gcc has trouble with library dependencies, sometimes, but it still doesn't work. I use gcc 4.6.3 on Ubuntu 12.04 64bits. The problem occurs either with boost 1.46.1 (taken from the repositories) or with 1.50.0 (installed with bjam). Any hint ? Thibaut Lepage

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Setup Boost::Signals2 with Remote Objects?
by Clark Cianfarini 18 Aug '12

18 Aug '12

Hello, I am trying to develop a server/client set of applications in C++ that has the ability to be setup either all on one computer, or distributed across multiple machines (generally over an intranet). The goal is to have a possibility of N clients all connected to a single server. The server collects data from our various sensors, bundles it into a single object, and ideally triggers a Boost::Signal2, passing the object, to send the data to all subscribed clients. The resulting processing methods of each client would be the subscribed slots and thus the processing would automatically be triggered. The current software is designed this way through the use of .NET remoting, but we are trying to move away from being tied down to the Windows realm. I cannot seem to find documentation as to how to set up remote objects in such a way to connect the signals and slots across processes/computers. Do I have to do this through the use of Boost::MPI in some manner? Or do I need to change my thought process and use just Boost::MPI with object serialization to just pass the data? Or is there some third option I should be looking at instead? Thank you, Clark <mailto:ccianfarini@Lumetrics.com> ccianfarini(a)Lumetrics.com

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boost optional assignment
by tolik levchik 17 Aug '12

17 Aug '12

The following code gives me compilation error. With const reference it's ok. Is it right behaviour? #include <boost/optional.hpp> #include <boost/shared_ptr.hpp> struct foo{ // foo(int const& of) good foo(int& of) // error {} }; int main(){ boost::shared_ptr<int> ptr; boost::optional<foo> opt; opt = *ptr; }

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boost::math::standard_deviation how to use ?
by leeto 17 Aug '12

17 Aug '12

How to compute standard_deviation using boost I want that interface will be like in excel i mean you mark some data and that all ) How do the same in c++ boost using data from a standard container like vector for example... Many thanks in advance #include <boost/math/distributions.hpp> // For non-member functions of distributions #include <vector> #include <numeric> using namespace std; int main () { std::vector<double> v; for (unsigned int i = 0; i < 7; i++) { v.push_back(std::rand()%7); } std::vector<double>::iterator i = v.begin(); for (i ; i != v.end(); ++i) { std::cout << (*i) << ", "; } cout << std::accumulate(v.begin(), v.end(),0) << endl; //boost::math::normal_distribution cout << "\n\n\n" ; return 0; -- View this message in context: http://boost.2283326.n4.nabble.com/boost-math-standard-deviation-how-to-use… Sent from the Boost - Users mailing list archive at Nabble.com.

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interrupt a blocking stream read
by Chris Stankevitz 17 Aug '12

17 Aug '12

I am attempting to interrupt a blocking stream read. The below code doesn't work since std::istream::read is not a valid boost thread interruption point. Can someone recommend a way to get something like this work work, preferably using boost's cross-platform constructs? Thank you, Chris === void f() { try { char c[999999999]; cin.read(c, 999999999); } catch (boost::thread_interrupted) { } } int main() { boost::thread t(f); f.interrupt(); f.join() return 0; }

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[chrono] Issues with _ITERATOR_DEBUG_LEVEL
by Christian Henning 17 Aug '12

17 Aug '12

Hi there, compiling with the latest trunk version gives me the following linker error with the chrono lib: libboost_chrono-vc100-mt-1_51.lib(chrono.obj) : error LNK2038: mismatch detected for '_ITERATOR_DEBUG_LEVEL': value '0' doesn't match value '2' in Factory.obj Usually the solution is to recompile the lib with _ITERATOR_DEBUG_LEVEL=2 but the problem preservers. Can someone tell what wrong with compiling boost with: bjam -j8 --toolset=msvc --without-mpi variant=debug link=static runtime-link=shared define=_CRT_NONSTDC_NO_DEPRECATE define=_CRT_SECURE_NO_DEPRECATE define=_SCL_SECURE_NO_DEPRECATE define="_ITERATOR_DEBUG_LEVEL=2" stage I mean, is the define="_ITERATOR_DEBUG_LEVEL=2" syntactically correct? Thanks, Christian

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Removing intermediate files
by Lloyd 17 Aug '12

17 Aug '12

Hi, I am using bjam to buiild boost (1.47) Windows. I would like to remove the temporary/intermediate files created by the build process to save the space. Checking the documentation, I found the --clean, --clean-all options but they removes the library. Whats the right method to remove the intermediate files? Thanks, Lloyd

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[mpi] communicators constructed from groups are invalid
by Daniel Mitchell 16 Aug '12

16 Aug '12

Hi everyone, when I construct a communicator from a group, the resulting communicator is invalid. Here's an example. //------------------------------ example begin -------------------------------// #include <boost/mpi/communicator.hpp> #include <boost/mpi/environment.hpp> #include <boost/mpi/group.hpp> int main(int ac, char** av) { boost::mpi::environment env(ac, av); boost::mpi::communicator world; int rank[] = {0}; boost::mpi::communicator comm(world, world.group().include(rank, rank + 1)); } //------------------------------ example end ---------------------------------// This program throws an exception when comm is destroyed (MPI_Comm_free: MPI_ERR_COMM: invalid communicator). If I try calling comm.size() or something, it throws an "invalid communicator" exception then, too. However, asserting on comm succeeds, so clearly comm is confused about its state. I found some outstanding tickets (5596, 6436) but those discussions don't seem to go anywhere. Can anyone offer help?

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[MPI] how to compile Boost.MPI on Cray Linux?
by Riccardo Murri 16 Aug '12

16 Aug '12

Hello, I'm trying to compile Boost.MPI on a Cray XK6 machine. The MPI wrapper compiler is called `CC` and should be invoked with no particular options. However, Boost complains that `CC` is not known and does not compile Boost.MPI: MPI auto-detection failed: unknown wrapper compiler CC Please report this error to the Boost mailing list: http://www.boost.org You will need to manually configure MPI support. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. I have added the following to the top-level `project-config.jam` file, but it does not help Jam to DTRT: using mpi : CC ; Any hints on how to proceed? Thanks, Riccardo

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[xpressive] accessing nested results from a submatch
by Nathan Ridge 16 Aug '12

16 Aug '12

Hi, Is there a way to access nested results associated with a submatch? For example: sregex A = some_xpr; sregex B = (s1 = A) >> other_xpr >> (s2 = A); smatch m; regex_match(str, m, B); I know I can get a list of all the nested matches inside m, and I can filter it down by regex id to matches for A, but is there a way to get, say, "the nested matches for A that occurred inside the sub-match s2" without necessarily knowing what is the position of that in the list of all nested matches for A? Thanks, Nate

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