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

program_options: Is there a way to parse an ODBC connect string?
by Eric J. Holtman 16 Nov '09

16 Nov '09

I'd like to parse an ODBC connect string (or other similarly constructed strings) using program_options. So, I have something like: Data Source=myServerAddress;Initial Catalog=myDataBase;Integrated Security=SSPI; now, I could implement the function that converts this to something I can use, like --Data_Source myServerAddress --Initial_Catalog myDataBase --Integrated_Security SSPI but I was wondering since there's already a split_winmain function, is there a function that already does this, before I roll my own?

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[Asio]opening two udp::sockets on different ports
by Ãtienne Lepercq 16 Nov '09

16 Nov '09

I am not a specialist in TCP/UDP communications, but I am trying to implement some communications using UDP packets (v6). I can't use anything else than UDP v6 due to external constraints. I am using boost 1.37. I tried boost 1.40, same problem (see below) I have implemented a first architecture, working like : - a server listens to UDP packets v6 coming on a port ( let's say 65000). - a client connects to that port by sending a UDP packet. - the server starts a new thread, which listens for udpv6 packets on another port - the client should deconnect and reconnect to that other port. Cleitns starts opening the first socket like that : boost::asio::io_service io_service; udp::endpoint endpoint; udp::socket socket(io_service); udp::resolver::query query(udp::v6(), m_host, m_port); udp::resolver resolver(io_service); endpoint = *resolver.resolve(query); socket.open(udp::v6()); Then a function is called that sends a packet, receive an answer, etc... WORKS ! Then, I would like that socket being closed, and reopened on the same host, but on a different port. Something like this : socket.close(); udp::socket socket(io_service); udp::resolver::query query2(udp::v6(), m_host, NEWPORT); udp::resolver resolver2(io_service); endpoint = *resolver2.resolve(query2); socket.open(udp::v6()); But it fails miserably, throwing exception "Host not found (Authoritative)" on this second attempt. m_host is the ipv6 loopback address, "::1". I tried declaring at the same time, a full new set of io_service, endpoint, socket, query, resolver : the very same thing happens ! That said, there is another thread listening on the NEWPORT for udp v6 packets. I am developping mainly under linux, using lsof lists exactly the right number of ports opened (m_port and NEWPORT are opened for udpv6) So what is incorrect ? I don't really understand the behavior and complexity of io_service, maybe that's the problem ? How can I reopen a second socket on another port ? That port being listed by the system as opened succesfully, I really think the problem lies in that section. Thank you !

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boost-regex: how to compile with mingw?
by Matthias Pospiech 16 Nov '09

16 Nov '09

I have never worked with boost or the regex libary but need it as a dependency for another project. I could compile the libary for Visual Studio 2005 (VS8), but the docs give not a single hint how to compile with mingw on Windows (here XP). I tried gcc an generic, but that does not work H:\boost_1_40_0\libs\regex\build>mingw32-make -fgcc.mak gcc.mak:37: "Building Boost.Regex without ICU / Unicode support:" gcc.mak:38: "Hint: set ICU_PATH on the nmake command line to point " gcc.mak:39: "to your ICU installation if you have one." mkdir -p gcc mkdir -p gcc/boost_regex-gcc-1_40 Syntaxfehler. mingw32-make: *** [gcc/boost_regex-gcc-1_40] Error 1 H:\boost_1_40_0\libs\regex\build>mingw32-make -fgeneric.mak mkdir -p generic Ein Unterverzeichnis oder eine Datei mit dem Namen "-p" existiert bereits. Folgender Fehler trat auf: -p. mingw32-make: *** [generic] Error 1 How should it be done? Matthias

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[serialization] Problems with serializing a shared_ptr
by Stefan Ulbrich 16 Nov '09

16 Nov '09

Hello, I want to add serialization support to the Eigen2 matrix class. It works well (at least at compile time) until I try to serialize a shared_ptr. boost::shared_ptr<MatrixXd> shape; template <typename Archive> void serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(shape); }; I receive a long error message that begins with the first error: /usr/local/include/boost/type_traits/has_new_operator.hpp: In instantiation of 'boost::detail::has_new_operator_impl<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >': /usr/local/include/boost/type_traits/has_new_operator.hpp:109: instantiated from 'boost::has_new_operator<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >' /usr/local/include/boost/mpl/if.hpp:67: instantiated from 'boost::mpl::if_<boost::has_new_operator<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >, boost ::mpl ::identity <boost::archive::detail::heap_allocator<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >::has_new_operator>, boost ::mpl ::identity <boost::archive::detail::heap_allocator<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >::doesnt_have_new_operator> >' /usr/local/include/boost/mpl/eval_if.hpp:37: instantiated from 'boost::mpl::eval_if<boost::has_new_operator<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >, boost ::mpl ::identity <boost::archive::detail::heap_allocator<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >::has_new_operator>, boost ::mpl ::identity <boost::archive::detail::heap_allocator<Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000> >::doesnt_have_new_operator> >' /usr/local/include/boost/archive/detail/iserializer.hpp:235: instantiated from 'static T* boost::archive::detail::heap_allocator<T>::invoke() [with T = Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000>]' /usr/local/include/boost/archive/detail/iserializer.hpp:278: instantiated from 'void boost::archive::detail::pointer_iserializer<Archive, T>::load_object_ptr(boost::archive::detail::basic_iarchive&, void*&, unsigned int) const [with Archive = boost::archive::xml_iarchive, T = Eigen::Matrix<double, 10000, 10000, 2, 10000, 10000>]' BodySchema.cpp:110: instantiated from here /usr/local/include/boost/type_traits/has_new_operator.hpp:85: error: call of overloaded 'check_sig(int)' is ambiguous Has anybody a hint for me what is missing in the matrix class? second, could anybody please explain to me what BOOST_SERIALIZATION_SHARED_PTR does and when I have to use it (only saw it in the demo file). Thank you, Best regards Stefan

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[foreach][auto] Mixing foreach and auto ?
by Maxime van Noppen 16 Nov '09

16 Nov '09

Hi list, I'm a big fan of both foreach and auto facilities provided by Boost and was thinking of merging the two. I searched in the list archives and saw the question was discussed earlier but didn't find a clear reason on why it shouldn't be done. How bad is this quite simple solution : > #define AUTO_FOREACH(VAR, COL) \ > BOOST_FOREACH_PREAMBLE() \ > if (boost::foreach_detail_::auto_any_t BOOST_FOREACH_ID(_foreach_col) = BOOST_FOREACH_CONTAIN(COL)) {} else \ > if (boost::foreach_detail_::auto_any_t BOOST_FOREACH_ID(_foreach_cur) = BOOST_FOREACH_BEGIN(COL)) {} else \ > if (boost::foreach_detail_::auto_any_t BOOST_FOREACH_ID(_foreach_end) = BOOST_FOREACH_END(COL)) {} else \ > for (bool BOOST_FOREACH_ID(_foreach_continue) = true; \ > BOOST_FOREACH_ID(_foreach_continue) && !BOOST_FOREACH_DONE(COL); \ > BOOST_FOREACH_ID(_foreach_continue) ? BOOST_FOREACH_NEXT(COL) : (void)0) \ > if (boost::foreach_detail_::set_false(BOOST_FOREACH_ID(_foreach_continue))) {} else \ > for (BOOST_AUTO(VAR, BOOST_FOREACH_DEREF(COL)); !BOOST_FOREACH_ID(_foreach_continue); BOOST_FOREACH_ID(_foreach_continue) = true) > > #define auto_foreach AUTO_FOREACH It is basically the same code as BOOST_FOREACH (from boost 1.39) except that last line where I added the BOOST_AUTO in the for initialization. auto_foreach can then be used as : > auto_foreach(i, container) // i is a copy > auto_foreach(&i, container) // i is a reference > auto_foreach(const &i, container) // is a const reference This seems pretty cool and I don't see obvious pitfalls though I don't know the exact magic behind both auto & foreach. Am I living dangerously by using this auto_foreach ? Thanks, -- Maxime

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[test] Linking against boost_unit_test_framework causes double-deletion in std::ostringstream
by Alastair Rankine 16 Nov '09

16 Nov '09

Just curious if anyone else has seen this or anything like it? Platform is Mac OS X 10.6.1, gcc 4.2.1, boost 1.40.0 installed from MacPorts, compiling 64-bit (default). Here's my test code: #include <sstream> int main() { std::ostringstream str; str << "Help Me!"; return 0; } Here's what I'm doing: % g++ -o streamtest_bad -ggdb -L/opt/local/lib -lboost_unit_test_framework-mt-d streamtest.cpp % ./streamtest_bad streamtest_bad(63554) malloc: *** error for object 0x7fff7008a500: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug zsh: abort ./streamtest_bad % Works fine against other boost libraries, eg system: % g++ -o streamtest_good -ggdb -L/opt/local/lib -lboost_system-mt-d streamtest.cpp % ./streamtest_good % Note that this seems to be a separate problem to that reported in ticket 3432 (https://svn.boost.org/trac/boost/ticket/3432). At least, I have verified that the framework::clear() function isn't being called in the above code, which does tend to point the finger at a different part of the library. The backtrace is not particularly enlightening, but posted here for the sake of completeness: (gdb) bt #0 0x00007fff87f92ff6 in __kill () #1 0x00007fff88034072 in abort () #2 0x00007fff87f4b095 in free () #3 0x0000000100005533 in __gnu_cxx::new_allocator<char>::deallocate (this=0x7fff5fbff5df, __p=0x7fff7008a500 "") at new_allocator.h:97 #4 0x0000000100005578 in std::string::_Rep::_M_destroy (this=0x7fff7008a500, __a=@0x7fff5fbff63f) at basic_string.tcc:431 #5 0x0000000100005939 in std::string::_Rep::_M_dispose (this=0x7fff7008a500, __a=@0x7fff5fbff63f) at basic_string.h:238 #6 0x000000010000596a in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string (this=0x7fff5fbff670) at basic_string.h:493 #7 0x000000010002ad55 in std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::overflow (this=0x7fff5fbff7f8, __c=72) at sstream.tcc:125 #8 0x0000000100029db0 in std::basic_streambuf<char, std::char_traits<char> >::xsputn (this=0x7fff5fbff7f8, __s=0x100000e7e "Help Me!", __n=8) at streambuf.tcc:102 #9 0x00007fff806e0ae4 in std::__ostream_write<char, std::char_traits<char> > () #10 0x00007fff806deb98 in std::__ostream_insert<char, std::char_traits<char> > () #11 0x00007fff806dec58 in std::operator<< <std::char_traits<char> > () #12 0x0000000100000d6b in main () at streamtest.cpp:6

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Boost.Test: access name of test case within that case?
by Martin Moene 16 Nov '09

16 Nov '09

(Previously mis-posted in Boost.testing) Hi, I'm wondering if the name of a Boost.Test test case is available within that case, and if so how. Couldn't find it in the documentation, the list, a web search, nor by a quick browse of the sources. Thanks for any reply , -- Martin Moene, http://www.eld.physics.LeidenUniv.nl/~moene/

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Integration testing tools a-top boost::test?
by Tim St. Clair 16 Nov '09

16 Nov '09

Gennadiy and Co, Boost test works great for my unit tests, but I'm curious to see what other folks use for high level integration tests across a multi-platform env? Ideally it would be atop of some script language so it's easy to add and adjust, which may require some setup & teardown in the local env and could differ for each platform. Plugins to some continuous integration env are a +. -- Cheers, Timothy St. Clair Sr. Software Engineer [Red Hat - MRG]

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[Asio]About aync_write and socket.close()
by victor 16 Nov '09

16 Nov '09

Hi,All io_service_.run() in itself thread. I initial socket with it , like "socket_(io_service_)" . Then I read data from this socket in io_service thread. Now if i want call "async_write " to this socket in another thread, do I must use "io_service_.post( boost::bind function which call async_write)", or can I call async_write directly? And if i want close this socket, do I must use "io_service_.post(..)" , or can I use "socket_.close()" directly in another thread? thanks

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[multi_array][serialization]
by er 16 Nov '09

16 Nov '09

The issue of serializing a multi-array came up here: http://lists.boost.org/boost-users/2007/06/28639.php I was wondering if anyone had followed up on this and would be willing to share his/her code.

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