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Help with voronoi diagram
by rehouma 22 Jul '15

22 Jul '15

<http://boost.2283326.n4.nabble.com/file/n4678233/voronoi.png> I work on a project were I needed to generate the voronoi diagram (dashed lines = voronoi diagram). I used boost successfully. Now, I need to determine the coordinates of the output point e11 from the coordinates of the input point e1 and determine the coordinates of the other input point e12. Please help me, how can I do this. Thanks. -- View this message in context: http://boost.2283326.n4.nabble.com/Help-with-voronoi-diagram-tp4678233.html Sent from the Boost - Users mailing list archive at Nabble.com.

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enable_if error with Intel compiler 15.0.1
by Matthieu Brucher 21 Jul '15

21 Jul '15

Hi, I got this error on Linux with the Intel compiler: PATH/boost/boost_1_58_0/include/boost/core/enable_if.hpp(36): error: incomplete type is not allowed struct enable_if : public enable_if_c<Cond::value, T> {}; ^ detected during: instantiation of class "boost::enable_if<Cond, T> [with Cond=boost::mpl::and_<boost::fusion::traits::is_sequence<boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>, boost::fusion::cons<boost::spirit::qi::action<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type>>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>>>, boost::fusion::nil_>>>, boost::mpl::not_<boost::is_convertible<boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>, boost::fusion::cons<boost::spirit::qi::action<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type>>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>>>, boost::fusion::nil_>>, boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>>>, boost::mpl::bool_<true>, boost::mpl::bool_<true>, boost::mpl::bool_<true>>, T=void]" at line 92 of "PATH/boost/boost_1_58_0/include/boost/type_traits/is_convertible.hpp" instantiation of class "boost::detail::is_convertible_basic_impl<From, To, false> [with From=boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>, boost::fusion::cons<boost::spirit::qi::action<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type>>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>>>, boost::fusion::nil_>>, To=boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>]" at line 357 of "PATH/boost/boost_1_58_0/include/boost/type_traits/is_convertible.hpp" instantiation of class "boost::detail::is_convertible_impl<From, To> [with From=boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>, boost::fusion::cons<boost::spirit::qi::action<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type>>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>>>, boost::fusion::nil_>>, To=boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>]" at line 437 of "PATH/boost/boost_1_58_0/include/boost/type_traits/is_convertible.hpp" instantiation of class "boost::detail::is_convertible_impl_dispatch<From, To> [with From=boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>, boost::fusion::cons<boost::spirit::qi::action<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type>>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>>>, boost::fusion::nil_>>, To=boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>]" at line 482 of "PATH/boost/boost_1_58_0/include/boost/type_traits/is_convertible.hpp" instantiation of class "boost::is_convertible<From, To> [with From=boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>, boost::fusion::cons<boost::spirit::qi::action<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type>>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>>>, boost::fusion::nil_>>, To=boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard, true, false>]" at line 27 of "PATH/boost/boost_1_58_0/include/boost/mpl/aux_/nested_type_wknd.hpp" [ 26 instantiation contexts not shown ] instantiation of class "boost::proto::transform<PrimitiveTransform, X>::result<Sig> [with PrimitiveTransform=boost::proto::switch_<boost::spirit::meta_compiler<boost::spirit::qi::domain>::cases, boost::proto::tag_of<boost::proto::_> ()>, X=void, Sig=boost::spirit::meta_compiler<boost::spirit::qi::domain>::meta_grammar (boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::spirit::_1_type>, 2L>> &>, 2L> &, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::dereference, boost::proto::argsns_::list1<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char &>, 0L>, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>> &>, 2L> &>, 2L> &>, 1L> &>, 2L>, boost::mpl::void_, boost::spirit::unused_type)]" at line 206 of "PATH/boost/boost_1_58_0/include/boost/spirit/home/support/meta_compiler.hpp" instantiation of class "boost::spirit::result_of::compile<Domain, Expr, Modifiers, Enable> [with Domain=boost::spirit::qi::domain, Expr=boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::spirit::_1_type>, 2L>> &>, 2L> &, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::dereference, boost::proto::argsns_::list1<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char &>, 0L>, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>> &>, 2L> &>, 2L> &>, 1L> &>, 2L>, Modifiers=boost::spirit::unused_type, Enable=void]" at line 184 of "PATH/boost/boost_1_58_0/include/boost/spirit/home/qi/nonterminal/rule.hpp" instantiation of "void boost::spirit::qi::rule<Iterator, T1, T2, T3, T4>::define<Auto,Expr>(boost::spirit::qi::rule<Iterator, T1, T2, T3, T4> &, const Expr &, boost::mpl::true_) [with Iterator=__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, T1=expr_node (), T2=boost::spirit::ascii::space_type, T3=boost::spirit::unused_type, T4=boost::spirit::unused_type, Auto=boost::mpl::false_, Expr=boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::spirit::_1_type>, 2L>> &>, 2L> &, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::dereference, boost::proto::argsns_::list1<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char &>, 0L>, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>> &>, 2L> &>, 2L> &>, 1L> &>, 2L>]" at line 221 of "PATH/boost/boost_1_58_0/include/boost/spirit/home/qi/nonterminal/rule.hpp" instantiation of "boost::spirit::qi::rule<Iterator, T1, T2, T3, T4> &boost::spirit::qi::rule<Iterator, T1, T2, T3, T4>::operator=(const Expr &) [with Iterator=__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, T1=expr_node (), T2=boost::spirit::ascii::space_type, T3=boost::spirit::unused_type, T4=boost::spirit::unused_type, Expr=boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::spirit::_1_type>, 2L>> &>, 2L> &, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::dereference, boost::proto::argsns_::list1<const boost::proto::exprns_::expr<boost::proto::tagns_::tag::shift_right, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char &>, 0L>, const boost::proto::exprns_::expr<boost::proto::tagns_::tag::subscript, boost::proto::argsns_::list2<boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, expr_node (), boost::spirit::ascii::space_type, boost::spirit::unused_type, boost::spirit::unused_type> &, const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::attribute<0>>, 0L>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::detail::tag::function_eval, boost::proto::argsns_::list4<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<binary_op_phx>, 0L>, boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<const char *>, 0L>, boost::spirit::_val_type, boost::spirit::_1_type>, 4L>>>, 2L>> &>, 2L> &>, 2L> &>, 1L> &>, 2L>]" at line 82 of "test.cpp" instantiation of "Grammar<Iterator>::Grammar() [with Iterator=__gnu_cxx::__normal_iterator<const char *, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>]" at line 92 of "test.cpp" I can't make sense of this, as it works fine with gcc or Visual Studio. The original file is far bigger, but this is the smallest grammar I could make that displays this error... If someone knows... Matthieu -- Information System Engineer, Ph.D. Blog: http://matt.eifelle.com LinkedIn: http://www.linkedin.com/in/matthieubrucher Music band: http://liliejay.com/

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Re: [Boost-users] [IPC Named Mutex]
by Lorenzo Trivelli 21 Jul '15

21 Jul '15

Good evening, I've further investigated innto the possible solution I found out to get system boot time under win machines (even if my last post did not have so much success :-D ) After some tries, it seems that the boot time is not always the same, but they are different ALWAYS by 1 ms,Usually in my experience a machine does not boot every 1 ms (:-D) so a possible workaround would be: 1) compute boot time 2) try to open the shared folders with the given boot time 3) if fails, try to add or subtract one ms and repet step 2, if all of them failes then you are sure that id does not exist may it work or is it too cumbersome ? regards L. Trivelli

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asio: async_write handler not called in Linux but called in Windows
by Lloyd 21 Jul '15

21 Jul '15

Hi, I have an application that need to work on both Windows and Linux. We are using asio for network communication (boost 1.57). In this, once the connection is established with the server, the connection handler in client executes the following async calls... boost::asio::async_read_until(Socket, stream, string("\r\n"), boost::bind(&MyConnection::HandleRead, shared_from_this(), boost::asio::placeholders::error)); ... ... ... boost::asio::async_write(Socket,boost::asio::buffer(buff,len), boost::bind(&MyConnection::HandleWrite,shared_from_this(), boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred)); On Windows, the "HandleWrite" function is called as soon as the data is written. But on Linux this function never gets called!. In Linux and Windows HandleRead is getting called as expected. In bot the the case, the server receives the data properly. Is there any reason for this? Thanks, Lloyd

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Log: Filter expression in file stream init
by Florian Lindner 20 Jul '15

20 Jul '15

Hello, I have this piece of code: http://pastebin.com/iMyyaB6a It adds a file and a console log and reads in a file config: [Core] # Filter="%Severity% > 1" [Sinks.MyConsoleSink1] Destination=Console and prints some messages: using namespace boost::log::trivial; boost::log::sources::severity_logger<severity_level> lg; BOOST_LOG_SEV(lg, trace) << "A trace severity message"; BOOST_LOG_SEV(lg, debug) << "A debug severity message"; BOOST_LOG_SEV(lg, info) << "An informational severity message"; BOOST_LOG_SEV(lg, warning) << "A warning severity message"; BOOST_LOG_SEV(lg, error) << "An error severity message"; BOOST_LOG_SEV(lg, fatal) << "A fatal severity message"; It does exactly what I want, prints each message twice to the console. But when I uncomment the Filter expression it prints nothing. Why not? Severity > 1 means everything info and above, doesn't it? Thanks, Florian

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Test: Aborting at global fixture
by Florian Lindner 17 Jul '15

17 Jul '15

Hello, what is the canonical way of reporting an error that accours at the global fixture: #include <boost/test/unit_test.hpp> struct GlobalFixture { GlobalFixture() { std::cout << master.argc << std::endl; BOOST_FAIL("CRASH BOOM"); } ~GlobalFixture() { std::cout << "Global teardown\n"; } }; BOOST_GLOBAL_FIXTURE(GlobalFixture) Crashes with segfault. Thanks, Florian

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Boost.DLL formal review is ending soon - submit your reviews
by Vladimir Prus 17 Jul '15

17 Jul '15

Boosters, I wanted to remind that the formal review of Boost.DLL library by Antony Polukhin is nearing the end - the last day to submit reviews is Sunday. Of course, not much discussion is likely to happen on Sunday, so if you have any thoughts, sending them on Thursday or Friday will be much appreciated. Thanks in advance! The summary of the library features and review checklists are reproduced below. Boost.DLL is a C++98 library for comfortable work with DLL and DSO. Library provides a portable across platforms way to: - load libraries at runtime - import and export any native functions and variables - make alias names for C++ mangled functions and symbols - query libraries/objects and executables for sections and exported symbols - self loading and self querying - getting program and module location by exported symbol The documentation can be found at: http://apolukhin.github.io/Boost.DLL/index.html and the source can be obtained at: https://github.com/apolukhin/Boost.DLL Please post your reviews on the mailing list and if possible, answer the following questions: - Should the library be accepted? - How useful is it? - What's your evaluation of - Design - Implementation - Documentations - Tests - How much effort did you put into your evaluation? - Did you attempt to use the library? On what systems and compilers? Thanks, Volodya _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Problem with boost.log in a multithread application
by Rajalakshmi Iyer 17 Jul '15

17 Jul '15

Hello, I am using Boost.Log to produce 2 logs for a multi-thread application. There are 2 singleton channel_mt loggers corresponding to 2 files. Several threads continuously write different messages to the two loggers. Log file rotation is enabled on both loggers and in the event of rotation, the logs are collected into a different folder. All of this works as expected for a while, except randomly (but surely at some point) - I start seeing a stream of messages like - [2015-Jul-17 01:11:26.532653] (info): *** Exception: boost::filesystem::last_write_time: No such file or directory: "/var/infinity/rtb/auction_log" [2015-Jul-17 01:11:26.532896] (info): Boost Exception - libs/log/src/text_file_backend.cpp(1160): Throw in function void boost::log::v2_mt_posix::sinks::text_file_backend::consume(const boost::log::v2_mt_posix::record_view&, const string_type&) This goes on for a while and then my application hangs. It is not entirely clear whether this incidence happens only during size based rotation or even otherwise. Any pointers on how to approach this issue would be greatly appreciated. Thanks Raj -- This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. Any views or opinions expressed are solely those of the author and do not necessarily represent those of BlisMedia Ltd, a company registered in England and Wales with registered number 06455773. Its registered office is 3rd Floor, 101 New Cavendish St, London, W1W 6XH, United Kingdom. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error.

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Is this a known bug in lexical_cast<double> ?
by TILLMAN, MICHAEL D9 16 Jul '15

16 Jul '15

We're using boost 1.51. Management is reluctant to upgrade because the software is for manned space flight and our current boost version has been stable. Wanted to see if there was a known bug with boost::lexical_cast<double>. We're seeing failures on what appear to be valid float strings. When we catch the exception, and simply do a second cast on the same string, the cast succeeds. The Code fragment: try { dVal = boost::lexical_cast<double>(theValue); } catch(boost::bad_lexical_cast &eX) { ... more code ... firstAttemptFailed = true; } // If the first cast succeeded, don't bother to attempt it again. if(firstAttemptFailed == true) { // Let the API throw the actual exception if the second attempt also fails. dVal = boost::lexical_cast<double>(theValue); } The string sequence this fails on is: ... ... "7104", "0.416666699999999999983", "0.22222224", "4.08233160000000000001", "1.81436960000000000002", ... ... It fails on the last string, "1.81.....", in the actual program, but when compiled into a simple test program, it succeeds. If there is a known bug, we may be able to get a Boost upgrade installed. Thanks, Mike

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Re: [Boost-users] Query regarding interest in my submitting plf::colony to Boost
by Colin Humphries 16 Jul '15

16 Jul '15

> I don't think anything related to multithreading should be done by such kind of container. Disturbed by that comment I just wanted to add for the benefit of anyone just starting out with multi-threading that in my experience containers are entirely safe for multi-threading PROVIDED that you're only reading from them (i.e. they are passed by const &). This is by far the most efficient way to pass common information into parallel threads (all threads read the same data). For containers required to return a result, the approach that works for me is to create a vector of containers and dedicate one to each thread. The result containers must be guaranteed to remain in scope until all threads have completed so I usually make them global. The only challenge is how to efficiently coalesce the partial results. Get this wrong (or use too many threads) and the performance gain from multi-threading quickly evaporates. Colin Humphries

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