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[Boost.Signals2] Problem with cleanup when disconnecting from slot.
by Paul Blampspied 03 Dec '16

03 Dec '16

Am I right in thinking that when a signal is connected to a closure created by boost::bind, then the closure should be destructed when the connection is closed ? I am having trouble because I pass a boost::shared_ptr in the closure. The use count does not drop when the signal connection is closed (the signal is connected to a one-shot slot which closes the connection). As a result the shared_ptr never deletes its data causing a memory leak. I have seen a few mentions of bugs in signals2 with respect to object destruction on connection termination. Perhaps I have fallen foul of that. It seems quite a serious bug though considering the general standard of boost. Given that the one-shot slot receives the shared_ptr I am considering a hack to fix the problem - explicitly break into the shared_ptr and decrement the reference count that I believe should be decremented by conn.disconnect(). Is there a better way ?

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Closure not destructed properly when signals2 connection is closed.
by Paul Blampspied 03 Dec '16

03 Dec '16

Am I right in thinking that when a signal is connected to a closure created by boost::bind, then the closure should be destructed when the connection is closed ? I am having trouble because I pass a boost::shared_ptr in the closure. The use count does not drop when the signal connection is closed (the signal is connected to a one-shot slot which closes the connection). As a result the shared_ptr never deletes its data causing a memory leak. I have seen a few mentions of bugs in signals2 with respect to object destruction on connection termination. Perhaps I have fallen foul of that. It seems quite a serious bug though considering the general standard of boost. Given that the one-shot slot receives the shared_ptr I am considering a hack to fix the problem - explicitly break into the shared_ptr and decrement the reference count that I believe should be decremented by conn.disconnect(). Is there a better way ?

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[Log] Random "double free or corruption" in dtor of attribute_value_set
by robin.lorke＠jenoptik.com 01 Dec '16

01 Dec '16

Hi Gentlemen, I have an application that is using Boost.Log. The application is long-term running (days, weeks, maybe months). Currently I am experiencing random crashes in my application that seem related to Boost.Log. I dont't say that is is a bug in Boost.Log, but probably I am doing something wrong. I am using version 1.55.0 but I also tried upgrading to version 1.61.0 but it is still happening there. I am currently able to reproduce the crash by forcing logs at a pace of 3 records per second. Then it takes up to 3 days for the crash to happen. The application is multi-threaded and therefore several threads may be logging at the same time. For that reason I chose "severity_logger_mt". It seems related to the destruction of objects of type attribute_value_set. This is a gdb stacktrace of the crash (gcc O0 build): (gdb) bt #0 0xb6bdbed8 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:66 #1 0xb6bdf960 in __GI_abort () at abort.c:90 #2 0xb6c139fc in __libc_message (do_abort=2, fmt=0xb6cc8c44 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:200 #3 0xb6c1e17c in malloc_printerr (action=3, str=0xb6cc8d80 "double free or corruption (!prev)", ptr=<optimized out>) at malloc.c:4949 #4 0xb6b3fcb8 in boost::log::v2_mt_posix::attribute_value_set::~attribute_value_set() () from /usr/lib/libboost_log.so.1.55.0 #5 0xb6b42688 in boost::log::v2_mt_posix::record_view::public_data::destroy (boost::log::v2_mt_posix::record_view::public_data const*) () from /usr/lib/libboost_log.so.1.55.0 #6 0xb6b44c7c in boost::log::v2_mt_posix::core::push_record_move (boost::log::v2_mt_posix::record&) () from /usr/lib/libboost_log.so.1.55.0 #7 0xb6e66814 in Logger::addLog(Logger::LEVEL, char const*, char const*, int) () from /usr/lib/libtslog.so.1 #8 0x0005ba50 in addLogRusp (iMessageId=2, sMessage=<optimized out>, sProcess=0x8dee8 "Application", eLevel=Logger::LEVEL_INFO) at ../src/RLS-V/Platform/System.inl.h:303 #9 RLS::Application::fnThreadRuspOut (thread=...) at ../src/RLS-V/Application.cpp:1447 #10 0xb6e7aa4c in Thread::startFunction(void*) () from /usr/lib/libtscommon.so.1 #11 0xb6edae38 in start_thread (arg=0xb3eff460) at pthread_create.c:313 #12 0xb6c7c318 in ?? () from /lib/libc.so.6 Backtrace stopped: previous frame inner to this frame (corrupt stack?) This is the global logger initialization (using some custom attributes): BOOST_LOG_GLOBAL_LOGGER_INIT(appLogger, boost::log::sources::severity_logger_mt< robot::log::Severity >) { core::get()->add_global_attribute("TimeStamp", attributes::local_clock()); core::get()->add_global_attribute("ProcessID", AttrProcessId()); core::get()->add_global_attribute("LineCounter", attributes::counter< unsigned int >()); core::get()->add_global_attribute("Process", attributes::current_process_name()); core::get()->add_global_attribute("Scopes", attributes::named_scope ()); core::get()->add_global_attribute("LineID", attributes::counter< unsigned int >(1)); core::get()->add_global_attribute("SimpleTimeStamp", AttrSimpleTime ()); Logger::init(); sources::severity_logger_mt< Severity > lg; return lg; } These are are my macros for logging: //these are needed to convert a macro into a string #define STRINGIFY(x) #x #define TOSTRING(x) STRINGIFY(x) /* NOTE: * __FUNCTION__ is not a macro. It's a char pointer. So we use an empty std::string as basis to concatenate the char* to it */ #define R_LOG_ID(x,y) BOOST_LOG_SEV (robot::log::appLogger::get(), y) << boost::log::add_value("LogID", x) << boost::log::add_value("FLF", ROBOT_FLF) #define R_LOG(x) R_LOG_ID(0, x) #define ROBOT_FLF std::string() + TOSTRING(__FILE__) + ":" + TOSTRING (__LINE__) + " (" + __FUNCTION__ + ")" While "R_LOG_ID" is the only one that is used currently. There are currently three sinks active: syslog, console and a custom sink sending log records via an IPC mechanism (http://www.cs.cmu.edu/~./IPC/) I am currently testing if it will still happen if I deactivate one or more of those sinks. I imagine it will be hard to tell the exact problem from the information above but maybe you guys could point me in the right direction where to dig deeper. I will happily provide any missing information and/or code snippets that could help. Possibly there are well-known common mistakes that can lead to that memory corruption in attribute_value_set? Maybe something like lazy evaluation of log expressions or multi-threading issues? Many thanks in advance for any help! Robin Lorke

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std::future::wait_for() not working in Boost UDP socket async receive operation
by jc.francois＠gmail.com 30 Nov '16

30 Nov '16

The good people over at stackoverflow were not able to help me with this issue that I expected to be trivial. I am writing a UDP server app with Boost that should listen on a socket for 5 seconds and if no datagram has been received within these 5 seconds, move on to do other things. After some research I decided to try the solution based on std::future. The problem is that the call to wait_for() always times out as if no data was received. But if I set a breakpoint on the line that executes after the timeout and that I inspect variables I see that the buffer contains the received datagram and the remote_endpoint object contains the address of the client. In other words the socket receive works as expected but the std::future::wait_for() does not react. why? Here is my test server code: { try { boost::asio::io_service io_service; boost::asio::io_service::work work(io_service); std::thread thread([&io_service]() { io_service.run(); }); udp::socket socket(io_service, udp::endpoint(udp::v4(), 10000)); char recv_buf[8]; for (;;) { ZeroMemory(recv_buf, 8); udp::endpoint remote_endpoint; std::future<std::size_t> recv_length; recv_length = socket.async_receive_from( boost::asio::buffer(recv_buf), remote_endpoint, 0, boost::asio::use_future); if (recv_length.wait_for( std::chrono::seconds(5)) == std::future_status::timeout) { printf("time out. Nothing received.\n"); } else { printf("received something: %s\n", recv_buf); } } io_service.stop(); thread.join(); } catch (std::exception& e) { printf("Error: %s\n", e.what()); } return 0; }

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Question on data structure usage
by Ram 29 Nov '16

29 Nov '16

Hi, I have a map as follows, boost::unordered_map<string, string> sample_map; I would like to look up the keys using wildcards/regex from the user and get the values corresponding to it(get multiple matches). It looked like there is no straightforward way to do it. So, I was thinking as an when I populate the map, I create a seperate data structure to store the keys, so that I can get the values(list) that match my user inputted regex/wildcard search. The I use this list to get the values from the map. What data structure can I use for this purpose? Is my approach correct? Or can I do this directly using the map? Please help me solve this problem. Thanks, -R

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Re: [Boost-users] Do we have plan to support VS 2017?
by senthil vel 29 Nov '16

29 Nov '16

Hi All, I am using VS 2017 for my software development.The last official release of boost ( boost_1_62_0 ) supports VS 2015. When will we get VS 2017 supported boost library? Is there any workaround, till we get the support? Regards, Senthil

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[Boost.DateTime] How to bypass checks in boost::gregorian::date constructor
by dariomt＠gmail.com 28 Nov '16

28 Nov '16

>From the docs I see: "date(greg_year, greg_month, greg_day) Construct from parts of date. Throws bad_year, bad_day_of_month, or bad_day_month (derivatives of std::out_of_range) if the year, month or day are out of range." In my use case, I know for sure that the year, month and date are all in the valid range of values, so all the validity checks done by the library become redundant. Is it possible to somehow bypass those checks?

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Re: [Boost-users] Building Boost 1.62 With Visual Studio 2017 RC
by Trueman, Chris 24 Nov '16

24 Nov '16

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Building Boost 1.62 With Visual Studio 2017 RC
by Trueman, Chris 24 Nov '16

24 Nov '16

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Assertion failure in r_c_shortest_paths.hpp
by Amit Prakash Ambasta 23 Nov '16

23 Nov '16

Hi, I have a sample r_c_shortest_paths use case demonstrated below. However on executing this code, assertion error occurs at /usr/include/boost/graph/r_c_shortest_paths.hpp:473: Assertion `p_cur_label->b_is_valid' failed. I've referred to the prior issue reported at https://svn.boost.org/trac/boost/ticket/11723 However, against his example specified, I can not reproduce the error.

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[release] Boost 1.63.0 Beta 1
by Marshall Clow 21 Nov '16

21 Nov '16

The first beta packages for 1.63.0 beta 1 are now available: <https://sourceforge.net/projects/boost/files/boost/1.63.0.beta.1/> The SHA256 checksums are as follows: 3dbc1bca10941710755c13a00b1ae56d2d37fe90bbadcf9746203194f9d33e3a boost_1_63_0.7z c8b986fd57e436fd88dbc70e51d3e21efa2be3bdf835fa499b2cf6c0a8cc2985 boost_1_63_0.tar.bz2 745d99e4be9c0f324ec7ba15b7d228fd780067f2e8aeae2f16660a4cf6e6a051 boost_1_63_0.tar.gz e66bd6e2f637148c314398b92bc1f3cbdc777ee282f9de7885697afad3d9c202 boost_1_63_0.zip As always, the release managers would appreciate it if you download the archive of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. Thanks! -- The release managers

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beginner boost::statechart questions
by Bedeho Mender 20 Nov '16

20 Nov '16

Hi, I have a few questions about the statechart library. 1) I would like to pass around a representation of the current configuration of a machine, to allow inspection of local variables and active states. The easiest approach would be to just pass around a copy of the machine, but this is not possible since the state_machine class is noncopyable. An alternative could have been to pass around a constant ref/ptr to the machine, but this is also not workable because the inspection will happen in another thread, and synchronisation is not feasible. Any suggestions? One alternative is to create a new snapshot representation, but it will be a headache to keep in synch with the primary machine. 2) A related question is whether there is a good way to start a machine in a given configuration? Using a sequence of events works in principle, but its a very impractical way to do so. For example if one wishes to restore a configuration from a prior session, then the client code has to log the full event history, and it may have a very hard time determining how many events need to be logged to reconstruct the given configuration. Logging and storing *all* events from the prior session will in many cases be wasteful, or even infeasible. 3) Suppose a machine makes a certain callback to client code in a set of different reactions. It would be nice if the client could inspect the currently active state, from which the given reaction is originating. However, my understanding is that the machine is unstable when processing a reaction, hence this is not possible. Is there a way around this? Best Bedeho Mender ᐧ

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[geometry] Cannot compile boost::geometry::intersection
by Stanley Friesen 17 Nov '16

17 Nov '16

I am using boost library version 1.54 with gcc --std=c++11. I am trying a simple use of geometry::intersection as follows: #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/adapted/boost_polygon.hpp> using namespace boost::geometry; ...... typedef model::d2::point_xy<double> point_xy; model::polygon<point_xy> clipBounds; // add points to clipBounds model::polygon<point_xy> area; // add points to area model::polygon<point_xy> result; if(boost::geometry::intersection(area, clipBounds, result)) { std::cout << std::endl << "Boost intersection, size = " << num_points(result) << std::endl; } If I comment out the call to intersection, everything compiles. With it I get: In file included from /usr/include/boost/serialization/level.hpp:28:0, from /usr/include/boost/serialization/nvp.hpp:31, from ...: /usr/include/boost/mpl/eval_if.hpp: In instantiation of ‘struct boost::mpl::eval_if_c<false, boost::range_const_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >, boost::range_mutable_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > > >’: /usr/include/boost/range/iterator.hpp:63:63: required from ‘struct boost::range_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >’ /usr/include/boost/range/value_type.hpp:30:12: required from ‘struct boost::range_value<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >’ /usr/include/boost/geometry/algorithms/intersection.hpp:97:64: required from ‘static bool boost::geometry::dispatch::intersection<Geometry1, Geometry2, Tag1, Tag2, Reverse>::apply(const Geometry1&, const Geometry2&, GeometryOut&, const Strategy&) [with GeometryOut = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Strategy = boost::geometry::strategy_intersection<boost::geometry::cartesian_tag, boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >, boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >, boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian>, void>; Geometry1 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Geometry2 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Tag1 = boost::geometry::polygon_tag; Tag2 = boost::geometry::polygon_tag; bool Reverse = false]’ /usr/include/boost/geometry/algorithms/intersection.hpp:201:67: required from ‘bool boost::geometry::intersection(const Geometry1&, const Geometry2&, GeometryOut&) [with Geometry1 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Geometry2 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; GeometryOut = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >]’ /home/stanley/workspace/worldmodel/metric/map/GISCache.cpp:2492:62: required from here /usr/include/boost/mpl/eval_if.hpp:60:31: error: no type named ‘type’ in ‘boost::mpl::eval_if_c<false, boost::range_const_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >, boost::range_mutable_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > > >::f_ {aka struct boost::range_mutable_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >}’ typedef typename f_::type type; Since my code is virtually identical to the sample code in the documentation, I am very puzzled by this. What have I missed? How do I get this to compile? (I do find it odd that this error refers to boost/serialization rather than boost/geometry, but I suppose that has to do with the order of inclusion). -- View this message in context: http://boost.2283326.n4.nabble.com/geometry-Cannot-compile-boost-geometry-i… Sent from the Boost - Users mailing list archive at Nabble.com.

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[statechart] Pass event data to state constructor using triggering_event
by ramonpadilla1＠yahoo.co.uk 16 Nov '16

16 Nov '16

I would like to be able to communicate the data from an event to a state that gets constructed as a result of a transition. From this post in 2009 and this one in 2010 the use of triggering_event() is suggested. However, I can't find an example anywhere that demonstrates how to use it. Can anyone help? Links in the message | Google Groups | | | | Boost - Users - [statechart] Passing pa... | |

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[statechart] Passing parameters from event to State Local Storage
by Christophe Bourez 16 Nov '16

16 Nov '16

I need to maintain a parameter into the state local storage. This parameter is initially contained in the event that causes the transition to the target state. I give hereafter a small illustrative example. typename sc = boost::statechart; class EvTest : public sc::event<EvTest> { public: EvTest(std::size_t val) : value(val) {} std::size_t getValue() const { return this->value; } private: std::size_t value; }; class MyStateMachine; class StSource; class StTarget; class StSource : public sc::simple_state<StSource, MyStateMachine> { public: typedef sc::custom_reaction<EvTest> reactions; sc::result react(const EvTest &event) { // How to pass event.getValue() to the target state ? transit<StTarget>(); } }; class StTarget : public sc::simple_state<StTarget, MyStateMachine> { public: StTarget(std::size_t val) : val(value) {} private: std::size_t value; }; Thanks, Christophe

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Help needed for boost polygon get trapezoid
by Lei Yin 15 Nov '16

15 Nov '16

Hello all, I recently moved to use boost.polygon for doing non-manhattan shape boolean operation, and I'm using get_trapezoids() function to convert output polygons to trapezoids. There're two problems I'm facing and couldn't overcome: 1. Somehow boost.polygon not always give me the largest polygon as possible. In the result, frequently I saw there are two trapezoids are neighboring each other, and they can be perfectly combined into one big trapezoid, but for some reason, boost.polygon give me separated two instead of one. 2. It maybe due to floating point snapping issue (I'm operating on integer base), for some special cases, I got very slim trapezoid like 1 db unit in width. Preferably, this trapezoid Any suggestion to solve above issues would be much appreciated! Thanks in advance. Lei

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How to get response of the questions I posted?
by Bruce 15 Nov '16

15 Nov '16

Hi, I am not familiar with emails list. First time use or I don't known where to post boost.log questions. I found I can't receive the response of my thread by email. I have to check the boost.user archive and I can't response in the archive list. I do subscribed to this list or I can't post. Anybody can help me? Many thanks.

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Questions about extending boost::log sink backend based on app_luncher example
by Bruce 15 Nov '16

15 Nov '16

Hi,I am extending the boost::log backend sink to show log record into GUI ListBox control, which is gui_logger. I modify based on the app_luncher example which extends backend sink of :basic_formatted_sink_backend. Below are the questions that I have for now: 1) when modifying the consume function, I don't know how to get the message body. void consume(logging::record_view const& rec, string_type const& command_line); I using TRACE of visualstudio 2015 to first log the message out into vs2015 console. But I don't know how the get the message from record_view? 2) When I TRACE(command_line.c_str()) of consume function, I logged every record out into vs2015 console. I need to set a filter to only output some of the log. How to set filters with gui_logger? I notice there is sink->set_filter function, but I don't know how to set in my situation.In my scenario, I setup a src::severity_channel_logger (db_logger) with keywords::channel = "dblog", which output to db.log file. I want to use gui_logger to show the latest 200 records on the ListBox. gui_logger should use the same filter with db_logger. gui_logger log the latest 200 records into gui ListBox. db_logger log all the records into text file. So I need to set the same filter with db_logger. 3) I read settings from the ini file for db_logger. I want also to read setting from ini file for gui_logger. How to do it?

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How to wrap boost::log class to user?
by Bruce 14 Nov '16

14 Nov '16

Hi, I am coding a project and I use boost::log. I need to supply the log function to user, but I don't want the user use boost::log directly. I want to wrap the boost::log into my class. But I still want to keep the << cascade feature. Basically, I need to implement a MyLogger class, which support: MyLogger(info) << bla bla bla; MyLogger(trace) << bla bla bla; and in the operator << function, I can use: BOOST_LOG_SEV macro. I don't know how to implement the operator << in MyLogger class. Can anybody helps me, Thanks.

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How to use boost::log to setup multiple logger?
by 刘宝良 14 Nov '16

14 Nov '16

Hi, I want to use boost::log to setup 3 logger for different purpose. Not one logger to have multiple output file. And I also want one logger to have one file output and a GUI output to be viewed by the end user. How to do it? -Bruce

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boost::filesystem::path::iterator and libstdc++ std::search
by Oleksandr Senkovych 11 Nov '16

11 Nov '16

Hi guys. Several days ago I've faced a strange issue with boost::filesystem::path::iterator - it segfaults when used in some STL algorithms. Here's a sample code that crashes: http://melpon.org/wandbox/permlink/58aIbfJWeGgMKMdF I looked at the issue a little bit and discovered that the reason for that is this part of iterator code: const path& dereference() const { return m_element; } So when using std::search libstdc++ has to convert binary predicate to unary for later use in std::find_if: __first1 = std::__find_if(__first1, __last1, __gnu_cxx::__ops::__iter_comp_iter(__predicate, __first2)); It does this by capturing dereferenced value of second iterator (__first2 in a piece of code above) but since iterator is passed by-value, this wrapper holds dangling reference to local member of iterator.m_element. Now according to C++ standard part 24.2.1 [iterator.requirements.general]: 10. Destruction of an iterator may invalidate pointers and references previously obtained from that iterator. So this looks like a violation of a standard by libstdc++ library. Unfortunately I couldn't get my account registered at https://gcc.gnu.org/bugzilla/ and was not able to file a bug, so can I ask you to help me with it?

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boost::filesystem::native
by Christopher J. Pisz 10 Nov '16

10 Nov '16

I did a Google search to see how to check if a given path is valid, preferably using boost. It brought me here: http://stackoverflow.com/questions/10426671/how-to-check-if-path-is-valid-i… Great! I say to myself. I then Google up the boost doc here: http://www.boost.org/doc/libs/1_62_0/libs/filesystem/doc/portability_guide.… I then write myself a test: #include <iostream> #include <sstream> #include <boost/filesystem.hpp> int main() { const std::string test1 = "D:\\Programing Projects\\Git Workspace\\Common\\x64\\Debug"; const std::string test2 = "D:\Programing Projects\\Git Workspace\\Common\\x64\\Debug\\"; const std::string test3 = "D:/Programing Projects/Git Workspace/Common/x64/Debug"; const std::string test4 = "D:/Programing Projects/Git Workspace/Common/x64/Debug/"; if (!boost::filesystem::native(test1)) { std::cout << "Boost says the following path is not valid for the native operating system: " << test1 << std::endl; } if (!boost::filesystem::native(test2)) { std::cout << "Boost says the following path is not valid for the native operating system: " << test2 << std::endl; } if (!boost::filesystem::native(test3)) { std::cout << "Boost says the following path is not valid for the native operating system: " << test3 << std::endl; } if (!boost::filesystem::native(test4)) { std::cout << "Boost says the following path is not valid for the native operating system: " << test4 << std::endl; } return 0; } The Test's Output: Boost says the following path is not valid for the native operating system: D:\Programing Projects\Git Workspace\Common\x64\Debug Boost says the following path is not valid for the native operating system: D:Programing Projects\Git Workspace\Common\x64\Debug\ Boost says the following path is not valid for the native operating system: D:/Programing Projects/Git Workspace/Common/x64/Debug Boost says the following path is not valid for the native operating system: D:/Programing Projects/Git Workspace/Common/x64/Debug/ What is wrong with that path that it says it is not valid for my native Windows 10 operating system?

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Boost.ASIO stuck on some requests?
by Matthieu Brucher 10 Nov '16

10 Nov '16

Hi, I have an app that serves different clients and it is based on Boost.ASIO. My current issue is that if the first client is fast enough (a continuous fast loop with Python module requests), then the other clients may time out with no good reason when trying to connect. Is there a way of figuring out who is actually waiting on who? Maybe the clients are starved because of an issue on their box, or there is an issue in ASIO that serves always the first connection? Or is it Windows? I tried multithreading the server, but that didn't help, and a run with VTune Amplifier shows me that the app is mainly waiting. But if I add a 100ms sleep between requests, then everything is fine. But this is not an acceptable solution, as the clients in real life will want to launch requests all the time. Regards, Matthieu Brucher -- Information System Engineer, Ph.D. Blog: http://blog.audio-tk.com/ LinkedIn: http://www.linkedin.com/in/matthieubrucher

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[boost][process] Formal review results
by Antony Polukhin 09 Nov '16

09 Nov '16

The Boost.Process library is accepted. Congratulations to Klemens, and thanks to everybody who reviewed the library! The votes were as follows: + Johannes - Niall Douglas +/- Tom Kent +/- Nat Goodspeed + Paul A. Bristow +/- Bjorn Reese + Edward Diener + Boris Schäling +/- Raphaël Londeix + Klaim - Joël Lamotte Legend: + accept - decline +/- accept conditionally Separate thanks to Gavin Lambert for providing a solution to deadlocking problem. Additional thanks to Nat Goodspeed, Niall Douglas, Gavin Lambert, Raphaël Londeix and Bjorn Reese for spending significant amount of time on discussing, reviewing or testing the library. -- Quick review summary -- During the review multiple technical issues were raised and as far as I know, Klemens already working on them. The biggest win of the review - is a fix for possible deadlock with pipes. The most controversial part of the library is it's interface. Many comments were addressing: * passing arguments * starting process right in `system(...)` function Current approaches have benefits and drawbacks, other approaches have different benefits and drawbacks. At this point some people agree that the current approach is the lesser evil. Reviewers also wished to have better/richer documentation. P.S.: Please continue with the discussion and report issues that would help to improve the library. -- Best regards, Antony Polukhin

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Visual Studio "15" Preview Update 5 configuration
by csiga.biga＠aol.com 09 Nov '16

09 Nov '16

Hi fellow users! This is my first message to this list, so take it easy if something’s not right. I wanted to build Boost with the latest Visual Studio spin, dubbed „15” Update 5 (RC coming sometime in November), but the configuration scripts do not quite work. Because _MSC_VER is 1910, I get the unkown compiler pragma warning, but what is more vexing, is that the configuration is not right, I get compilation errors in boost::functional, because std::unary_function has been deprecated since C++11, and VS „15” has removed this function from the STL. The _MSC_FULL_VER is 191024516, and I wanted to use the new toolset, because it has significantly improved in terms of conformance, most notably support for generalized constexpr. (See full list in the link) Can someone help with patching the configuration scripts? I would rather not start defining things to get deprecated features into scope again, but if nothing else works as a hotfix, than so be it. Thanks in advance, Máté

1 0

Help in calculating the size of a boost::unordered_map
by Ram 08 Nov '16

08 Nov '16

Hi, I would like to calculate the size of my filled up boost::unordered_map including the house keeping. I was thinking of sizeof(boost:unordered_map mymap). I asked this question on stackoverflow but they say that wont help. Can somebody tell me an easy way to find the size including the housekeeping that it takes? The boost::unordered_map stores a std::string as the key and a pointer to my class object as the value. Thanks, Ram

5 7

An Asio based header-only asynchronous MySQL client library
by Cheng Lian 07 Nov '16

07 Nov '16

Hey all, Here is an Asio based header-only asynchronous MySQL client library called Amy (*A*synchronous *My*SQL). https://github.com/liancheng/amy In short, this library enables you to work with MySQL in both asynchronous and blocking ways. Links to examples are included in the README file. Haven't got time and energy to write comprehensive documents, though. The interesting thing is that, I wrote this library years ago as an exercise, open sourced it, and then basically forgot about it. However, recently an European developer contacted me and said that they used it in one of their game projects in production and it was "amazing". So I decided to spend some time to polish it a little bit and send it out here to see whether there are anyone else who are interested in it. Please let me know what you think about it. Thanks! Best, Cheng

1 0

Problem compiling a code that uses Boost
by Fernando E Alva Manchego 04 Nov '16

04 Nov '16

Hello, I'm trying to compile a code that uses boost. The code is this one: http://people.eng.unimelb.edu.au/tcohn/t3.html The version of boost installed in the machine is: 1.41 The machine where I'm running this code is a Scientific Linux release 6.8 (Carbon). The detailed error message that I get can be seen here: http://pastebin.com/ADj4j6k0 Basically, the errors messages are like this: undefined reference to `boost::program_options::options_description::options_description(...) undefined reference to `boost::program_options::validation_error::get_template(...) -lboost_program_options is in the compilation line. And I've checked using 'locate' that /usr/lib64 (as appears in the compilation line) contains: /usr/lib64/libboost_program_options-mt.so /usr/lib64/libboost_program_options-mt.so.5 /usr/lib64/libboost_program_options.so /usr/lib64/libboost_program_options.so.5 I would really appreciate any help you could help me with this error. Best, Fernando

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Re: [Boost-users] build of datetime library fails
by LAMOTTE Thierry 03 Nov '16

03 Nov '16

Dear Andreas and Marcel, I checked my Visual Studio 13 Update : it is Update 5, so on this side it is ok. But Andreas you were perfectly right : as soon as I get Boost release 1.56, compilation completes with no warning and no error. I retry Boost 1.62 but it still does not work : it claims for a msvc internal error C1001. Sorry I won't keep investigating since I do not have time for that. I get at least one that works and for now it is enough to help me move on on my project matters that are quite far for boost. I greatly thank both of you for your help, I really appreciate. Best regards, Thierry Note: I do no know why I could not login with my email/password and reply directly on http://boost.2283326.n4.nabble.com/build-of-datetime-library-fails-td468 9472.html#a4689486

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build of datetime library fails
by LAMOTTE Thierry 03 Nov '16

03 Nov '16

Dear Boost community, For the purpose of a project that uses Boost libraries, I tried rebuild Boost but I failed. I would please need some help to complete that building. My context is Microsoft Windows 7, 32 bits, Visual Studio 13 (msvc-12), Boost 1.54.0 My goal is to the create static libraries : libboost_chrono, regex, system, thread and datetime. I initially used a tutorial from the Nordic's github to build Boost : https://github.com/NordicSemiconductor/pc-ble-driver My last try was with Boost 1.54.0 (the one used in the mentioned tuto), the build of datetime library fails (I attached the ouput) and frankly speaking I do not know where I should start looking for. If anyone could help me ? For note, at early stage, I tried with Boost 1.62.0, but the outcome was even worse, I gave up. Best regards, Thierry

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Microsoft and hana
by Dan Bloomquist 31 Oct '16

31 Oct '16

I'm sorry, I take it back. Things were fine until I included <boost/hana.hpp> I had been testing with <boost/hana/core/when.hpp> and the likes of: template<class T> constexpr T pi = T(3.1415926535897932385); // variable template which would not work until I patched. And to quote: In this release, we've updated the C++ compiler and standard library with enhanced support for C++11 and C++14 features, as well as preliminary support for certain features expected to be in the C++17 standard. The most notable compiler changes include complete support for generalized constexpr. Maybe next time.... Best, Dan.

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Microsoft and hana
by Dan Bloomquist 29 Oct '16

29 Oct '16

I did a quick search here and didn't find anything on this. But I just patched up VS2015 with 'Visual Studio "15" Preview 5' <https://www.visualstudio.com/news/releasenotes/vs15-relnotes> and downloaded boost_1_62_0 The compiler now handles variable templates and I've compiled and run some simple hana tests. I did have to comment line 74 in "..\boost\hana\config.hpp". I just thought I'd drop a heads up for those, like me, that wanted to use hana with the Microsoft compiler. Best, Dan.

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Re: [Boost-users] Boost Coroutine
by Emile Cormier 29 Oct '16

29 Oct '16

On 16-10-19 02:57 AM, Oliver Kowalke wrote: > > I'm not the maintainer of boost.asio, so I don't know if an upgrade is > planed - you might ask Christopher Kohlhoff. > This is a bit worrisome to me. We are using the Boost.Asio + Boost.Coroutine integration _extensively_ in our project. Did the API change from Coroutine1 to Coroutine2? Is it simply a matter of including from boost/coroutine2/xxx instead of boost/coroutine/xxx based on some preprocessor macro being defined?

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boost 1.50 unable to make regex_match to work
by MAURICE Jean 27 Oct '16

27 Oct '16

1) Hi Kai, I wrote const_iterator BOOST_REGEX_CALL end()const { // JME 27/10/16 pour savoir si on passe là, je crée une division par 0 en // esperant que le compilateur ne la détecte pas int ijme1, ijme2; ijme2 = 1; ijme1 = 2; --ijme2; ijme1 = ijme1 / ijme2; return (!this->m_status ? 0 : this->m_expression + this->m_expression_len); // return (this->m_status ? 0 : this->m_expression + this->m_expression_len); JME 26/10/16 } Hoping the divide by 0 error would be thrown but it never appears. So I don't think this bug is annoying me. 2) As I am new to boost and regex I tried a simple test : string pattern = "GHI+"; string chaineatester = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; boost::regex boost_pattern( pattern ); boost::smatch what; int errjme = boost::regex_match( chaineatester, what, boost_pattern ); if (errjme == 1) { *outputLog << "test 1: GHI+ a été trouvé" << endl; } else { *outputLog << "test 1: GHI+ n'a pas été trouvé" << endl; // what[0] contains the whole string // what[1] contains the response code // what[2] contains the separator character // what[3] contains the text message. *outputLog << " what[0]:" << what[0] << endl \ << " what[1]:" << what[1] << endl \ << " what[2]:" << what[2] << endl \ << " what[3]:" << what[3] << endl; } string pattern2 = "GHI"; boost::regex boost_pattern2( pattern2 ); errjme = boost::regex_match( chaineatester, what, boost_pattern2 ); if (errjme == 1) { *outputLog << "test 1bis: GHI a été trouvé" << endl; } else { *outputLog << "test 1bis: GHI n'a pas été trouvé" << endl; *outputLog << " what[0]:" << what[0] << endl \ << " what[1]:" << what[1] << endl \ << " what[2]:" << what[2] << endl \ << " what[3]:" << what[3] << endl; } And here is what I get : test 1: GHI+ n'a pas été trouvé what[0]: what[1]: what[2]: what[3]: test 1bis: GHI n'a pas été trouvé what[0]: what[1]: what[2]: what[3]: What am I doing wrong ? Jean

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[geometry] Stable and fast rtree serialize/de-serialize
by 邓尧 27 Oct '16

27 Oct '16

Hi all, How can I serialize/deserialize a Boost.Geometry rtree reliably and efficiently ? I tried the experimental rtree serialization support built-in (-DBOOST_GEOMETRY_INDEX_DETAIL_EXPERIMENTAL=1), I found that the implementation was unstable and failed to deserialize sometimes. I don't even know whether it corrupted any of the tree nodes. I also implemented a slow hack: save all tree nodes during serialization and rebuild the rtree during deserialization. I want something faster. Serialization time isn't important to me, I just need a faster deserialization (as fast as the experimental implementation) Thanks

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Building Boost with VS15 Preview 5
by Trueman, Chris 26 Oct '16

26 Oct '16

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Can't catch Boost.Asio exceptions inside coroutines
by Sergey Shpikin 25 Oct '16

25 Oct '16

I have this little example of Boost.Asio code: http://codepad.org/tuQedXI7 It works as expected on Linux producing 1 2 Caught Host not found (authoritative) but on Windows it crashes with: 1 2 terminate called after throwing an instance of 'boost::system::system_error' what(): Unknown error Tested on Windows Server 2008, Windows 7 and Wine, everything is the same. I'm compiling on Linux for Windows with MXE ( http://mxe.cc/ ) on GCC 4.9.4, Boost version is 1.60.0. I'm really stuck at this point as nothing in Google looks a valid solution for the case and I already have a working application on Linux but it crashes on any network error on Windows. On Windows coroutines prevent any exceptions from being caught when the program is compiled with -O1/2/3 but they're caught with -O0 or -Os (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54267 — this is about GCC on FreeBSD but the same seemingly applies to MinGW). However, boost's own exceptions, like the aforementioned boost::system::system_error, still can't be caught.

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boost @ Meeting C++ 2016
by Jens Weller 24 Oct '16

24 Oct '16

Hello boost community, a short and final reminder, that the Meeting C++ conference is just a few weeks away! A few tickets are still available, here is the schedule: https://meetingcpp.com/index.php/schedule16.html The schedule also has the link to the student program and diversity tickets! Also there is still a few places available in the boost workshop with Boris Schäling and Michael Caisse. I plan to have a meetup for boost users in one of the breaks in the upper lounge, so that the boost communtiy is able to actually meet at Meeting C++! thanks, Jens Weller

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boost asio ssl read issue
by Ananth 24 Oct '16

24 Oct '16

Hi, I have posted the question here at StackForge with all the details. http://stackoverflow.com/questions/40163626/boost-asio- ssl-not-working-as-expected-when-used-with-null-buffers Basically, http://www.boost.org/doc/libs/1_40_0/doc/html/ boost_asio/overview/core/reactor.html did not work when used with ssl. With plain-tcp steam socket, it works fine. o If we do ssl_socket->lowest_layer().async_read_some(null_buffers(), read_cb), then we do get all data in read_cb, but read_cb keep getting called endlessly (and read_some then returns 0, with error 11 resource unavailable) (This causes cpu remain over-utilized for ever) If we do ssl_socket->async_read_some(null_buffers(), read_cb), then it works fine with small amounts of data. When larger data is to be received (~20MB or so), then not all data is received. around 1% of data towards the end is never received by the application. My guess is that data is sitting in openssl library some where I tried with latest ssl and boost code, but that did not help either. Can some one please help ? Thanks, Ananth

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Filesystem recursive iterator issues
by mlimber 24 Oct '16

24 Oct '16

I have this code, which does a simple recursive directory iteration and prints each directory entry and then does it again ( http://coliru.stacked-crooked.com/a/0bfab95a513ebed8 ): #include <boost/filesystem.hpp> #include <boost/range/iterator_range.hpp> #include <iostream> namespace fs = boost::filesystem; int main() { try { const auto iter = fs::recursive_directory_iterator{ "." }; for( const auto& entry : boost::make_iterator_range( iter, {} ) ) { std::cout << entry << "\n"; } // Rinse and repeat std::cout << "\n"; for( const auto& entry : boost::make_iterator_range( iter, {} ) ) // CRASH -- Replace 'iter' with 'fs::recursive_directory_iterator{"."}' and it will work. //for( const auto& entry : boost::make_iterator_range( fs::recursive_directory_iterator{"."}, {} ) ) { std::cout << entry << "\n"; } } catch( const std::exception& e ) { std::cerr << e.what() << "\n"; } catch( ... ) { std::cerr << "Unknown exception.\n"; } } As you can see at Coliru, it crashes. (It also crashes on Visual Studio 2012 and with Boost 1.55.0 and on Coliru with <experimental/filesystem> instead of Boost.) Similarly, using a filesystem iterator with std::distance() fails when the iterator passed in is used again later (with boost: http://coliru.stacked-crooked.com/a/1b06dca057872762 and with experimental/filesystem: http://coliru.stacked-crooked.com/a/7bd5e73f1444619d ). It seems that something in the state of the *constant* iterator gets confused or corrupted after it is advanced to the end. I have a workaround for it commented out in the code. I found this possibly related issue: https://svn.boost.org/trac/boost/ticket/11910 Am I missing something? Should I file a new bug report? Cheers! M

1 0

When to use BOOST_ALL_DYN_LINK?
by Florian Lindner 24 Oct '16

24 Oct '16

Hello, http://www.boost.org/doc/libs/1_62_0/libs/log/doc/html/log/installation/con… says: BOOST_LOG_DYN_LINK If defined in user code, the library will assume the binary is built as a dynamically loaded library ("dll" or "so"). Otherwise it is assumed that the library is built in static mode. This macro must be either defined or not defined for all translation units of user application that uses logging. This macro can help with auto-linking on platforms that support it. BOOST_ALL_DYN_LINK Same as BOOST_LOG_DYN_LINK but also affects other Boost libraries the same way. We build our library in a dynamic and a static version using SCons: staticlib = env.StaticLibrary ( target = buildpath + '/libprecice', source = [sourcesPreCICE] ) env.Alias("staticlib", staticlib) solib = env.SharedLibrary ( target = buildpath + '/libprecice', source = [sourcesPreCICE] ) env.Alias("solib", solib) Both have BOOST_LOG_DYN_LINK set: env.Append(CPPDEFINES=["BOOST_LOG_DYN_LINK"]) However, I wonder if this is correct. Should DYN_LINK only be set when building the dynamically linked lib? Thanks, Florian

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Update the index of a hashed_non_unique entry in boost::multiindex
by Ram 24 Oct '16

24 Oct '16

I have a boost::multiindex container which has an index as follows : boost::multi_index::hashed_non_unique< boost::multi_index::tag<IndexByNonUniqueId>, boost::multi_index::const_mem_fun<StoredObj, std::string, &StoredObj::getNonUniqueIdString> > This ID comes in as ""(empty string) when I initially get the object. I add it to the multiindex at this point. But later in the course of the program the ID gets populated using its "setNonUniqueId" method. At this point of time inside "setNonUniqueId" I would like to update the index to the object(in the multiindex) as well(while the ID is being updated from "" to something concrete). How do I do this? How do I locate the specific object and update the index? -R

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upgrade from boost 1.39 to boost 1.50. Issue with regex_match
by MAURICE Jean 21 Oct '16

21 Oct '16

Hi, I am 'upgrading' a huge C++ app from VS2005 (32bits) to VS2010 (64 bits) and boost 1.39 to boost 1.50. This app runs both under Windows and Linux. In a function that searchs subdirectories and files of a given directory, we get the list of all the elements and then this list is filtered by : if(true==boost::regex_match(sAdaptation, what, childNode.infoNode.rFullPathFilePattern)) sAdaptation is ".\TEST\un_noeud" (this subdirectory exists) childNode.infoNode.rFullPathFilePattern is something like {m_pimpl={...}} And regex_match always returns false. If you can give me information about what is happening ... Jean

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build boost 1.58 failed on centos 7.2
by Glenn WANG 20 Oct '16

20 Oct '16

hi, I try to build boost 1.58 on CentOS, but it cannot be done, there're many errors. could anybody help? thanks. ============================== ./b2 --with-log -q gcc.compile.c++ bin.v2/libs/system/build/gcc-4.8.5/release/threading-multi/error_code.o In file included from libs/system/src/error_code.cpp:19:0: ./boost/system/detail/error_code.ipp:48:27: error: expected ‘;’ at end of member declaration const char * name() const BOOST_SYSTEM_NOEXCEPT; ^ ./boost/system/detail/error_code.ipp:48:33: error: ‘BOOST_SYSTEM_NOEXCEPT’ does not name a type const char * name() const BOOST_SYSTEM_NOEXCEPT; ^ ./boost/system/detail/error_code.ipp:56:32: error: expected ‘;’ at end of member declaration const char * name() const BOOST_SYSTEM_NOEXCEPT; ^ ./boost/system/detail/error_code.ipp:56:38: error: ‘BOOST_SYSTEM_NOEXCEPT’ does not name a type const char * name() const BOOST_SYSTEM_NOEXCEPT;

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Boost Coroutine
by Miguel Portilla 19 Oct '16

19 Oct '16

Hello, Using Boost 1.62, I am seeing the following warning when I build my project. warning : Boost.Coroutine is now deprecated. Please switch to Boost.Coroutine2. To disable this warning message, define BOOST_COROUTINE_NO_DEPRECATION_WARNING. I haven't found any documentation on what exactly this means or how to 'switch'. Can someone please point me to some docs or explain what 'switching' entails? Thanks, -M

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Re: [Boost-users] [Boost-build] [System] Link issues using BOOST_ERROR_CODE_HEADER_ONLY
by Matthias Seemann 17 Oct '16

17 Oct '16

Hi, > We decided to fix these by defining the macro BOOST_ERROR_CODE_HEADER_ONLY > according to this link: > > http://www.boost.org/doc/libs/1_56_0/libs/system/doc/reference.html#Header-… > > However, when building Boost itself with this macro defined, we're > encountering several problems: > ... > 2) We get multiple definitions of "boost::system::throws" > Defining the macro BOOST_SYSTEM_NO_DEPRECATED (see that doc page above) resolved the issue of multiple definitions of "boost::system::throws". Matthias

1 0

boost graph pruning vertices (nodes)
by Brian Davis 14 Oct '16

14 Oct '16

In reading http://www.boost.org/doc/libs/1_62_0/libs/graph/doc/adjacency_list.html regarding Iterator and Descriptor Stability/Invalidation it leaves the impression that when using vecS there is no real good way to remove nodes. as example: typedef adjacency_list<listS, vecS> Graph; // VertexList=vecS all cases are wrong and typedef adjacency_list<listS, listS> Graph; // VertexList=listS where only one case is correct which leave the programmer walking the mine field. Of course same can be said for stl. My goal to remove graph vertices based on the value of the connected components. I currently have a method which uses connected components to generate a connected components list. I then generate a histogram of the connected components values thus giving me how many vertices are connected and what the connection property value is... assuming I understand connected components however I have thought I understood portions of boost only to find through some brain warp and folding my thought process back on itself like an origami master that I came to understand how certain parts work. vertid, component 0 0 1 0 2 0 3 0 4 1 5 1 6 2 7 2 8 2 9 2 10 2 11 2 12 3 13 3 so in this simple example vert ids [0-3] are connected in subnet 0 with a total of 4, [4-5] are connected in sub net 1 with a total of 2, [6-11] are connected in subnet 2 with a total of 6, and [12-13] is connected in subnet 3 with a total of 2. Histogram yields connected component value and number of vertices that have that value in the bin component : bin counts 0: #### 1: ## 2: ###### 3: ## etc for say subnet/subgraph less than 4 would yield the filtered histogram: 1: ## 3: ## using values 1, and 3 from filtered histogram I can then find the vertex ids to filter. Yielding vertices 4,5,12, and 15 to be removed which would remove subnets 1 and 3. 4 1 5 1 12 3 13 3 I tried to use boost::accumulators::density and maybe I have a different idea of what a histogram really is, but for a typical histogram density is just plane broken due to the seemingly use of count for number of bins (seems to ignore tag::density::num_bins) and associated logic. accumulator_t acc( tag::density::num_bins = n_bins, tag::density::cache_size = n_bins/2 ); Sure wish there was a boost::accumulators::histogram that just did what we need as programmers. I am unsure as to how much boost coolaid to drink before finding any use for density. I did find this relating to the seemingly not as advertised implementation of density http://lists.boost.org/Archives/boost/2008/01/132801.php. From http://www.boost.org/doc/libs/1_62_0/doc/html/accumulators/user_s_guide.html "The tag::density feature returns a histogram of the sample distribution. For more implementation details, see density_impl." err huh no it does not... at least in my testing. It would also be great if the abcicissas (intervals) were some how obtainable to compare to the ordinates (bin counts) . Note the histogram.hpp attached there. So I write by own histogram code using stl. I digress on that. So as I said I then filter the vertex vs connected components data based on a threshold say 4 to remove all vertices that are not connected to 4 or more vertices in a subnet/subgraph So I then have a list of vertices (subnets/subgraphs) that I wish to prune from the graph thus these questions: Question 1: if finding a list of vertices to erase, sorting them, and then using, a reverse iterator to remove(*itr, g) would this also not work? If this works why is it now shown as an example of vecS vertex removal working? Question 2: Should there not be a boost graph-ish way of doing this such as coloring vertices to be pruned by possibly adding property prune = true. then maybe a future call to prune(g) Question 3: Possibly there is a way to get filtered_graph to do the trick? Statement: it is unfortunate the use of the term vertex/vertices in stead of node(s) in boost graph. As some graphs have a vertex (euclidean geometry) such as a graph of the center-lines of the vascular network of a brain while other graphs do not. It is very confusing in this instance to keep the two strait in code. Ugh!

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Re: [Boost-users] [Serialization] Free-standing serialize function for "enum class"
by Bjorn Reese 13 Oct '16

13 Oct '16

On 10/13/2016 06:56 PM, Rüdiger Berlich wrote: > I have for a while suspected a problem with the serialization of an „enum class“ item (currently with Boost 1.61 on Ubuntu 16.04), and have written a small test program to further examine any potential problems. While the generated XML looks fine and I cannot see any problems with the enum class, my custom, free-standing „serialize“ function does not get called. Boost.Serialization automatically converts an enum into an int before it is serialized.

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[Serialization] Free-standing serialize function for "enum class"
by Rüdiger Berlich 13 Oct '16

13 Oct '16

Hi there, I have for a while suspected a problem with the serialization of an „enum class“ item (currently with Boost 1.61 on Ubuntu 16.04), and have written a small test program to further examine any potential problems. While the generated XML looks fine and I cannot see any problems with the enum class, my custom, free-standing „serialize“ function does not get called. It is modelled after the examples for non-intrusive serialization, so I do not understand the reason behind this. Any idea ? /*************************************/ // Compile with g++ --std=c++14 -o enum_ser -I/opt/boost/include/ -L/opt/boost/lib enum_ser.cpp -lboost_serialization #include <boost/serialization/nvp.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> #include <iostream> #include <sstream> enum class test_enum : int {a=5,b=6}; namespace boost { namespace serialization { //----------------------------------------- template<typename Archive> void serialize(Archive &ar , test_enum &x, const unsigned int){ std::cout << "Serializing via custom serialize function" << std::endl; int t = 0; if (Archive::is_saving::value) { t = static_cast<int>(x); ar & t; } else { ar & t; x = static_cast<test_enum>(t); } } //----------------------------------------- } } int main(int argc, char **argv){ std::ostringstream oss; test_enum x = test_enum::a; { boost::archive::xml_oarchive oa(oss); oa << BOOST_SERIALIZATION_NVP(x); } std::cout << oss.str() << std::endl; } /*************************************/ Output of the program (note: the „Serializing via custom serialize function“ does not appear) : /*************************************/ <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <!DOCTYPE boost_serialization> <boost_serialization signature="serialization::archive" version="14"> <x>5</x> </boost_serialization> /*************************************/ Thanks and Kind Regards, Beet

1 0

Boost test failures on arm platform
by Carlos Ferreira 13 Oct '16

13 Oct '16

Hello! I'm cross-compiling Boost to an arm platform and because of that, boost fails to execute the cxx11_* tests and then it outputs the information that the compiler does not support a series of cxx11_* capabilities. Is there a way to disable these library tests, when cross-compiling? -- Carlos Miguel Ferreira Researcher at Telecommunications Institute Aveiro - Portugal Work E-mail - cmf(a)av.it.pt Skype & GTalk -> carlosmf.pt(a)gmail.com LinkedIn -> http://www.linkedin.com/in/carlosmferreira

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