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[ANN] CppCon 2014 program available
by Boris Kolpackov 02 Jul '14

02 Jul '14

The CppCon 2014 Program is now available with talk titles, abstracts, and speakers: http://cppcon.org/conference-program/ The program contains over 100 one-hour sessions by over 70 speakers including plenary sessions by Scott Meyers and Herb Sutter, as well as the keynotes by C++ creator Bjarne Stroustrup on Keeping Simple Things Simple and Mark Maimone on using C++ on Mars: Incorporating C++ into Mars Rover Flight Software. We have also extended the Early Bird deadline to July 9 so you have … [View More]

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Why does async_connect() call listen()?
by Soren Dreijer 01 Jul '14

01 Jul '14

Hi there, By coincidence, I ended up looking at a stack trace where my application calls async_connect() on a asio::ip::tcp::socket. Two things took me by surprise: 1. Asio calls listen() under the hood. Why does it do that when I'm just trying to make an outbound TCP connection? 2. If the listen() call above is indeed required, why does it happen on the same thread where I call async_connect()? I thought the point of the method was to defer the work to the reactor? (For what it's worth, I'… [View More]ve had a case on a customer's machine where the call to listen() would hang for 30 seconds before returning -- probably because of a bad firewall -- causing my entire app to hang since the code assumes async_connect() is indeed async.) I've included the full stack trace below. Thanks, Soren 0:000> k ChildEBP RetAddr 0117db50 0f681c65 WS2_32!listen 0117db70 0f691013 EvoClr!boost::asio::detail::socket_ops::listen+0x35 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\socket_ops.ipp @ 658] 0117dbd8 0f690e9f EvoClr!boost::asio::detail::socket_select_interrupter::open_descriptors+0x163 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\socket_select_interrupter.ipp @ 78] 0117dbe4 0f690cc0 EvoClr!boost::asio::detail::socket_select_interrupter::socket_select_interrupter+0xf [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\socket_select_interrupter.ipp @ 42] 0117dc1c 0f690c1e EvoClr!boost::asio::detail::select_reactor::select_reactor+0x70 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\select_reactor.ipp @ 48] 0117dc44 0f17837e EvoClr!boost::asio::detail::service_registry::create<boost::asio::detail::select_reactor>+0x4e [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\service_registry.hpp @ 81] 0117dc80 0f6909e9 EvoClr!boost::asio::detail::service_registry::do_use_service+0x9e [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\service_registry.ipp @ 123] 0117dca0 0f6908ee EvoClr!boost::asio::detail::service_registry::use_service<boost::asio::detail::select_reactor>+0x39 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\service_registry.hpp @ 49] 0117dca8 0f68fab0 EvoClr!boost::asio::use_service<boost::asio::detail::select_reactor>+0xe [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\impl\io_service.hpp @ 34] 0117dcbc 0f68f731 EvoClr!boost::asio::detail::win_iocp_socket_service_base::get_reactor+0x30 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\win_iocp_socket_service_base.ipp @ 620] 0117dce4 0f68f6f1 EvoClr!boost::asio::detail::win_iocp_socket_service_base::start_connect_op+0x11 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\impl\win_iocp_socket_service_base.ipp @ 550] 0117dd28 0f68ed22 EvoClr!boost::asio::detail::win_iocp_socket_service<boost::asio::ip::tcp>::async_connect<boost::_bi::bind_t<void,boost::_mfi::mf1<void,Swift::BoostConnection,boost::system::error_code const &>,boost::_bi::list2<boost::_bi::value<boost::shared_ptr<Swift::BoostConnection> >,boost::arg<1> > > >+0xc1 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\detail\win_iocp_socket_service.hpp @ 515] 0117dd68 0f68c41a EvoClr!boost::asio::stream_socket_service<boost::asio::ip::tcp>::async_connect<boost::_bi::bind_t<void,boost::_mfi::mf1<void,Swift::BoostConnection,boost::system::error_code const &>,boost::_bi::list2<boost::_bi::value<boost::shared_ptr<Swift::BoostConnection> >,boost::arg<1> > > >+0x52 [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\stream_socket_service.hpp @ 234] 0117ddec 0f68a32e EvoClr!boost::asio::basic_socket<boost::asio::ip::tcp,boost::asio::stream_socket_service<boost::asio::ip::tcp> >::async_connect<boost::_bi::bind_t<void,boost::_mfi::mf1<void,Swift::BoostConnection,boost::system::error_code const &>,boost::_bi::list2<boost::_bi::value<boost::shared_ptr<Swift::BoostConnection> >,boost::arg<1> > > >+0x11a [c:\private\src\vendor\boost_1_55_0_sdk\include\boost\asio\basic_socket.hpp @ 779] 0117de9c 0f210146 EvoClr!Swift::BoostConnection::connect+0x11e [c:\private\src\vendor\swift\swiften\network\boostconnection.cpp @ 70] [View Less]

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[serialization] avoid nvp for wrapper class
by dariomt＠gmail.com 01 Jul '14

01 Jul '14

Hi list, How do I tell Boost.Serialization to serialize a wrapper as the primitive type, without requiring an nvp wrapper? I specifically don't want an extra level in the xml output. Example: given BOOST_STRONG_TYPEDEF(int, myInt); I'd like myInt to be serialized as an int. Thanks!

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[atomic] ThreadSanitizer reports a data race when using the code from "reference counting" example
by Adam Romanek 01 Jul '14

01 Jul '14

Hi Boosters! I'd like to draw your attention to an issue with Boost.Atomic that I encountered when using ThreadSanitizer. The problem is that when using the code shown in "reference counting" example [1] from the docs, the ThreadSanitizer reports a data race. Everything is described in detail in a StackOverflow thread [2] so I don't want to repeat all that here. Please help me determine whether it's a false positive, an issue in Boost.Atomic or a wrong usage of the code. Additionally, I … [View More]

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Intel 14.0.1 error with boost::bind
by Aniket Pugaonkar 01 Jul '14

01 Jul '14

Hi, I am using a test program for compiling a boost::bind in Intel MIC(Xeom Phi). Here are the details of the code and platform on which it is compiled. I am using thread building blocks in my code, but the following code does not contain any TBB threads. The errors in my test code below and original code are same. Compiler : Intel 13.0.1 / intel 14.0.1 SP1 Update 3 (latest from intel composer XE trial version) I am using our lab's compiler installed on a cluster. The TBB is installed in my … [View More]home directory. boost 1.55 is also installed in my home location. Compiled for MIC: icpc -mmic -L/home/aniketnp/tbb42_20140122oss/lib/mic -std=c++11 -I/home/aniketnp/boost_1_55_0 -I/home/aniketnp/tbb42_20140122oss/include test.cpp Scenario: a functor takes 2 arguments in its operator()() by using a boost::bind() method. The operator()() method contains a function which uses comparisons ( < or > ) using if-else logic. The error pops up here. Here is the following code. #include <iostream> #include <boost/bind.hpp> using namespace std; struct Info_t { int start; int end; Info_t(int s=0,int e=0) : start(s), end(e) { } }; template <typename T, typename time> void process_info(const T& info1, const T& info2, const time& t) { //the below gives compiler error * if ((info1.start < info2.end) && (info2.end > info1.end) && (info1.end < info2.start) )* std::cout << "yess error with mic" << std::endl; //the below if works fine if ((info1.start < info2.end) && (info2.end > info1.end)) std::cout << "no error at all" << std::endl; } template<typename Time> struct my_functor { public: my_functor() { } my_functor(Time& time_) : time(time_) { } typedef void result_type; template<typename info_t> void operator()(const info_t& info1, const info_t& info2) { const auto& i1 = info1; const auto& i2 = info2; process_info<info_t, Time> (i1,i2, time); } private: Time& time; }; int main() { Info_t i1(10,2); Info_t i2(2,10); int t = 1; auto func = boost::bind( my_functor<int>(t), _1, _2 ); func(i1,i2); return 0; } test.cpp(16): error: expression must have a constant value if ((info1.start < info2.end) && (info2.end > info1.end) && (info1.end < info2.start) ) ^ detected during: instantiation of "void my_functor<Time>::operator()(const info_t &, const info_t &) [with Time=int, info_t=Info_t]" at line 313 of "/home/aniketnp/boost_1_55_0/boost/bind/bind.hpp" instantiation of "void boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<void>, F &, A &, int) [with A1=boost::arg<1>, A2=boost::arg<2>, F=my_functor<int>, A=boost::_bi::list2<Info_t &, Info_t &>]" at line 61 of "/home/aniketnp/boost_1_55_0/boost/bind/bind_template.hpp" instantiation of "boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()(A1 &, A2 &) [with R=boost::_bi::unspecified, F=my_functor<int>, L=boost::_bi::list2<boost::arg<1>, boost::arg<2>>, A1=Info_t, A2=Info_t]" at line 48 test.cpp(16): error: this operator is not allowed in a template argument expression if ((info1.start < info2.end) && (info2.end > info1.end) && (info1.end < info2.start) ) ^ detected during: instantiation of "void my_functor<Time>::operator()(const info_t &, const info_t &) [with Time=int, info_t=Info_t]" at line 313 of "/home/aniketnp/boost_1_55_0/boost/bind/bind.hpp" instantiation of "void boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<void>, F &, A &, int) [with A1=boost::arg<1>, A2=boost::arg<2>, F=my_functor<int>, A=boost::_bi::list2<Info_t &, Info_t &>]" at line 61 of "/home/aniketnp/boost_1_55_0/boost/bind/bind_template.hpp" instantiation of "boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()(A1 &, A2 &) [with R=boost::_bi::unspecified, F=my_functor<int>, L=boost::_bi::list2<boost::arg<1>, boost::arg<2>>, A1=Info_t, A2=Info_t]" at line 48 test.cpp(16): error: expected a ">" if ((info1.start < info2.end) && (info2.end > info1.end) && (info1.end < info2.start) ) ^ detected during: instantiation of "void my_functor<Time>::operator()(const info_t &, const info_t &) [with Time=int, info_t=Info_t]" at line 313 of "/home/aniketnp/boost_1_55_0/boost/bind/bind.hpp" instantiation of "void boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<void>, F &, A &, int) [with A1=boost::arg<1>, A2=boost::arg<2>, F=my_functor<int>, A=boost::_bi::list2<Info_t &, Info_t &>]" at line 61 of "/home/aniketnp/boost_1_55_0/boost/bind/bind_template.hpp" instantiation of "boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()(A1 &, A2 &) [with R=boost::_bi::unspecified, F=my_functor<int>, L=boost::_bi::list2<boost::arg<1>, boost::arg<2>>, A1=Info_t, A2=Info_t]" at line 48 As a workaround, I try to do this, but same error if ((info2.start < info2.end) && (info2.end > info1.end) ) { if ( info1.end < info2.start) //do something } // error is propagated towards inner if loop test.cpp(17): error: expression must have a constant value if ( info1.end < info2.start) ^ detected during: instantiation of "void my_functor<Time>::operator()(const info_t &, const info_t &) [with Time=int, info_t=Info_t]" at line 313 of "/home/aniketnp/boost_1_55_0/boost/bind/bind.hpp" instantiation of "void boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<void>, F &, A &, int) [with A1=boost::arg<1>, A2=boost::arg<2>, F=my_functor<int>, A=boost::_bi::list2<Info_t &, Info_t &>]" at line 61 of "/home/aniketnp/boost_1_55_0/boost/bind/bind_template.hpp" instantiation of "boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()(A1 &, A2 &) [with R=boost::_bi::unspecified, F=my_functor<int>, L=boost::_bi::list2<boost::arg<1>, boost::arg<2>>, A1=Info_t, A2=Info_t]" at line 49 test.cpp(17): error: this operator is not allowed in a template argument expression (rest error is the same) ------------------------------------------------------------------------------------------------- Now, if I compile it without " -mmic " flag, then there is no compiler errors. I compile with this : icpc -L/home/aniketnp/tbb42_20140122oss/lib/intel64/gcc4.4 -std=c++11 -I/home/aniketnp/boost_1_55_0 -I/home/aniketnp/tbb42_20140122oss/include test.cpp I dont get any error. It compiles and runs fine. Any thoughts ? Please let me know. -- Thanks and regards, Aniket Pugaonkar [View Less]

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Oneshot fixture per test suit
by Florian Lindner 30 Jun '14

30 Jun '14

Hello, is it possible to have a test fixture that is created once per test suite and is destroyed after the last test of the test suite has been ran? A test suite level fixture is created before each and every test, a global fixture just once for the entire test programm. Thanks, Florian

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Re: [Boost-users] [fusion] maps and arrays
by Seeger, Steven D. (GSFC-444.0)[Embedded Flight Systems, Inc] 29 Jun '14

29 Jun '14

From: Agust?n K-ballo Berg? Subject: Re: [Boost-users] [fusion] maps and arrays >Not an official answer in any way, but considering it's not explicitly >documented as supported and your test case also fails when replacing >`fusion::map` with `std::tuple` I would consider it just a fluke in the >past. On the other hand, the following code compiles correctly (albeit >with possibly a warning): Hi Agustin thanks for your reply. You are correct that what I'm doing is not documented. … [View More]

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[thread] mutex is locked
by gast128 29 Jun '14

29 Jun '14

Dear all, does anybody know if there is a possibility to check if a mutex is locked? There is an 'owns_lock' on the lock type but not on the mutex. The main use case for me is debugging (and documentation) purposes: void MyClass::Process() { boost::unique_lock<boost::mutex> lck(m_mtx); ProcessImpl(); } void MyClass::ProcessImpl() { _ASSERT(m_mtx.is_locked()); //does not exist :( }

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Selecting one element per fusion sequence using mpl::int_s
by gsermaid 29 Jun '14

29 Jun '14

Dear all, I am trying to create a fusion sequence whose elements are non-const references to the elements of given set of sequences. In particular, for a given sequence of integral constants, say vector< int_<2>, int_<1> >, and two fusion sequences, say X = vector< X0, X1, X2, X3 > and Y = vector< Y0, Y1, Y2 >, I would like to create the following sequence R = vector< X2&, Y1& >, such that at<0>(R) == at<2>(X) and at<1>(R) == at… [View More]

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[fusion] maps and arrays
by Seeger, Steven D. (GSFC-444.0)[Embedded Flight Systems, Inc] 28 Jun '14

28 Jun '14

I've had some code written with boost 1.53 a while ago that uses fusion maps to define at compile-time packet structures. There is then compile time generated code that handles marshaling, unmarshaling, and packet size calculation on these structures. One of the big reasons for going this route was the ability to have arrays contained in the packets. When upgrading from boost 1.53 to 1.55 on my Gentoo box, this all broke. I posted a bug report at https://svn.boost.org/trac/boost/ticket/10133 … [View More]

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