November 2015 - Boost-users - lists.preview.boost.org

[type_erasure] BOOST_TYPE_ERASURE_MEMBER within namespace?
by Nat Goodspeed 23 Nov '15

23 Nov '15

I find that using BOOST_TYPE_ERASURE_MEMBER within my own namespace fails with compilation errors: myprog.cpp:23:1: error: no template named 'concept_interface'; did you mean '::boost::type_erasure::concept_interface'? This is with Boost 1.57, compiled with Apple clang from Xcode 7.1.1. Moving BOOST_TYPE_ERASURE_MEMBER to the global namespace allows successful compilation. I would rather avoid putting my has_member names into the global namespace. How to achieve that?

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Consistency when removing items from boost multi-index using an inner iterator
by Hovnatan Karapetyan 23 Nov '15

23 Nov '15

Hi, I already posted this same question on StackOverflow, since I have not gotten an answer yet reposting it here too. Suppose I am iterating over a boost::multi_index using one of the two indices. Then if I start iterating using the other index and erasing an element according some criteria, does that invalidate the upper iterator? E.g., struct person { string name; string last_name; string age;} typedef multi_index< person, index_by< ordered_non_unique<person, string, &person::name>, ordered_non_unique<person, string, &person::age> >> PersonCollection; PersonCollection pc; //insert some elements into pc auto index0 = pc.get<0>();auto range0 = index0.equal_range("John");while (range0.first != range0.second) { auto index1 = pc.get<1>(); auto range1 = index1.equal_range(34); while (range1.first != range1.second) { if (range1.first->last_name == "Smith") range1.first = index1.erase(range1.first); else ++range1.first; } ++range0.first;} So in this case, is the range0 iterator always valid? Thanks! Hovnatan

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[BGL]Using a function for weightmap to dijkstra_shortest_path
by Amit Prakash Ambasta 23 Nov '15

23 Nov '15

Hi, I am trying to write use BGL.dijkstra to calculate a shortest path in a time dependent network where edge.cost C(u, v) is a function of distance(a)edge.source and a variable wait time dependent on Edge.departure i.e. Cost(Edge(u,v), D(u)) = Wait(Edge(u, v).departure, D(u)) + Edge(u, v).delay The cost function ( and edge property is defined as): struct Eonnection { Eonnection(const Vertex source, const Vertex destination, const double departure, const double duration, const double cost) { this->source = source; this->destination = destination; this->departure = departure; this->duration = duration; this->cost = cost; }; Vertex source; Vertex destination; double departure; // Time of departure double duration; // Duration of traversing edge double cost; // Actual cost of traversing Edge std::pair<double, double> dyn_cost(std::vector<std::pair<double, double> > distances, double t_max) { std::pair<double, double> d_parent = distances[this->source]; double t_parent = d_parent.first; double c_parent = d_parent.second; double t_time_of_day = fmod(t_parent, 24 * 3600); double t_delay = t_time_of_day <= this->departure ? this->departure - t_time_of_day: this->departure + (24 * 3600 - t_time_of_day); double t_total = t_parent + t_delay + this->duration; if(t_total < t_max) { std::cout << "Edge usable with cost " << c_parent + this->cost << ", " << t_total << std::endl; return std::pair<double, double>(c_parent + this->cost, t_total); } else { std::cout << "Edge unusable" << std::endl; return std::pair<double, double>(std::numeric_limits<double>::infinity(), std::numeric_limits<double>::infinity()); } }; }; I'm trying to call dijkstra as dijkstra_shortest_paths_no_color_map( g, source, boost::make_iterator_property_map(pred.begin(), get(boost::vertex_index, g)), boost::make_iterator_property_map(distances.begin(), get(boost::vertex_index, g)), boost::make_transform_value_property_map( boost::bind<std::pair<double, double> >(&Eonnection::dyn_cost, _1, _2, distances, 24 * 3600 * 3), get(boost::edge_bundle, g) ), get(vertex_index, g), smaller, combiner, std::pair<double, double>(std::numeric_limits<double>::infinity(), std::numeric_limits<double>::infinity()), std::pair<double, double>(0, 0), vis ); However, this does not seem to work. How can I pass the weights as a dynamic function to dijkstra_shortest_paths?

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Levelization of DAG in Boost graph -- trying again
by bhattach 20 Nov '15

20 Nov '15

Not sure why my previous attempt to post a new topic didn't succeed -- page kept showing a note that the post was not accepted by the mailing list. Trying one more time. ------------------------ Although I've been using graphs for 30+ years, I'm new to Boost Graph Library. I'd like to do "classical levelization" of a DAG -- as is commonly used in applications like digital logic simulation, etc -- whereby level(v) = max_level(set of predecessors of v) + 1 I used record_distances() with breadth_first_search() and suitably defined property map, but I suspect that's returning level(v) = min_level(set of predecessors of v) + 1 Is there a simple way to use breadth_first_search() to get the level numbers I want, or do I need to write my own levelization routine? Thanks in advance for comments/suggestions/pointers. Debashis Bhattacharya -- View this message in context: http://boost.2283326.n4.nabble.com/Levelization-of-DAG-in-Boost-graph-tryin… Sent from the Boost - Users mailing list archive at Nabble.com.

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Asymmetry between function_input_iterator and function_output_iterator
by Daniel Hofmann 20 Nov '15

20 Nov '15

I experienced some issues and asymmetric behavior in the function input and output iterator interfaces [1] [2]. See the following small self-contained example: const auto two = make_function_input_iterator([]{ return 2; }, infinite{}); copy_n(two, 3, ostream_iterator<int>(cout, "\n")); This does not compile --- but it should, in my opinion. The problem is that make_function_input_iterator has two overloads, one that takes a Function& and one that takes a Function*. Shouldn't this rather take a Function by-values as the stdlib does, and let the user pass a std::ref if needs be? Then we could also pass lambdas, making this a viable feature in C++11 and later. Without being able to pass lambdas, I see almost no value in the input iterator. On a related note, the documentation does not say that the make_function_iterator always needs an Input state. In addition, the link to the function input iterator PDF on the overview page [3] 404s. Now to the function output iterator: const auto dummy_out = make_function_output_iterator([](int) {}); copy_n(nums, 3, dummy_out); Surprisingly this compiles since make_function_output_iterator takes its functor by const-ref (with a defaulted functor argument, which does not really make sense in my opinion, since the reason for the make_* function is type inference through the passed parameter). Note, though, how the function output iterator lives in the same iterators namespace as the functio input iterator, but is not inside the iterator directory. The respective headers are located at: boost/function_output_iterator.hpp boost/iterator/function_input_iterator.hpp I would love to understand the design decisions behind these, and if it would be possible to "modernize" them without breaking much of the interfaces. Cheers, Daniel J H [1] http://www.boost.org/doc/libs/1_59_0/libs/iterator/doc/function_input_itera… [2] http://www.boost.org/doc/libs/1_59_0/libs/iterator/doc/function_output_iter… [3] http://www.boost.org/doc/libs/1_59_0/libs/iterator/doc/index.html

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boost interprocess named_mutex: race condition at creation?
by Liwei Peng 20 Nov '15

20 Nov '15

Hi, I am using named_mutex for synchronization among multiple processes. If all of the processes try to open_or_create the same-name named_mutex: named_mutex mutex(open_or_create, "somename"); 1) Is there any race condition for mutex creation? Or the API will guarantee one will create and all others will open? 2) If there is race condition, what are the work-arounds for this on Linux? Thanks, Liwei

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A few ICL questions.
by Stephen Hewitt 19 Nov '15

19 Nov '15

I'm new to ICL and have a few questions and a problem. Here is my test code which demonstrated (Windows, MSVC 2012): > // "icl_question.cpp" > > >> #include "precomp.hpp" > > #include <iostream> > > #include <utility> > > #include <functional> > > #include <boost/cstdint.hpp> > > #include <boost/icl/closed_interval.hpp> > > #include <boost/icl/interval_map.hpp> > > >> typedef boost::icl::closed_interval<boost::uint16_t> interval_t; > > >> // Based on the in "boost/icl/functors.hpp". > > template <typename Type> struct inplace_assign > > : public boost::icl::identity_based_inplace_combine<Type> > > { > > typedef inplace_assign<Type> type; > > >> void operator()(Type& object, const Type& operand) const > > { > > object = operand; > > } > > }; > > >> // Why is the 7 template parameter not a template template parameter? > > // The code in "boost/icl/detail/design_config.hpp" does not define the > > // ICL_USE_INTERVAL_TEMPLATE_TYPE macro (I assume intentionally) which, if > > // defined, would make it so. > > typedef boost::icl::interval_map > > < > > boost::uint16_t, > > const char*, > > boost::icl::partial_absorber, > > std::less, > > inplace_assign, > > boost::icl::inter_section, > > interval_t > > > map_t; > > >> int main(int argc, char *argv[]) > > { > > using namespace std; > > >> map_t mem; > > // The commented line two down is what I intend, but it asserts at >> runtime. > > // This one works. > > mem += make_pair(interval_t(0, 0xfffe), "RAM"); > > //mem += make_pair(interval_t(0, 0xffff), "RAM"); > > mem += make_pair(interval_t(0xa000, 0xbfff), "Basic ROM"); > > >> cout << hex << mem << endl; > > >> return 0; > > } > > The first question is about the aggregate on collision functionality. I would just like to replace. I have implemented *inplace_assign *which does this but it seems strange that this isn't included. Am I missing something here (I fear I may well be)? The second question is why* interval_map*'s 7th template parameter ( *Interval*) is not a template template parameter. The code in "boost/icl/detail/design_config.hpp" does not define the *ICL_USE_INTERVAL_TEMPLATE_TYPE *macro (I assume intentionally) which, if defined, would make it so. The third question is about a runtime error I'm getting in the above code. The comment in *main *shows the scenario. Basically if I use *0xffff *as the end of the first range I get an ASSERT at runtime whereas 0xfffe works fine. Finally, the documentation seems a little sparse on the function of the *Section* template parameter. Any clarification on that would be appreciated.

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[ICL] seems not to handle sets that contain the maximum element of the domain type.
by Stephen Hewitt 18 Nov '15

18 Nov '15

ICL seems not to handle sets that contain the maximum element of the domain type. I sent a similar mail a day ago, but I've simplified my example. Here's the code: Windows 7 Boost 1.59.0 ----BEGIN CODE--- using namespace std; typedef boost::icl::closed_interval<boost::uint16_t, std::less> interval_t; typedef boost::icl::split_interval_set<boost::uint16_t, std::less, interval_t> set_t; set_t s; s += interval_t(0x0000, 0xffff); s += interval_t(0xa000, 0xbfff); cout << "BAD: " << hex << s << endl; s.clear(); s += interval_t(0x0000, 0xfffe); s += interval_t(0xa000, 0xbfff); cout << "GOOD: " << hex << s << endl; ----END CODE--- ---BEGIN OUTPUT--- BAD: {[0,9fff][a000,ffff]} GOOD: {[0,9fff][a000,bfff][c000,fffe]} ---END OUTPUT--- The bad example seems to fail because the set contains 0xffff. In the good example I use 0xfffe.

2 1

libboost_system-vc110-XXXX_54.lib: Why can't I use the static boost library?
by Andreas Kopeinig 17 Nov '15

17 Nov '15

Hello everybody, I try to use the boost libraries libboost_filesystem.lib and libboost_system.lib, both version 54, in a project about image processing using the Xbox kinect sensor. I want to use the prebuild windows binaries from the following link: http://sourceforge.net/projects/boost/files/boost-binaries/ I referenced the static libs correctly in visual studio in the project properties under "Linker->General->Additional Library Directories" and "Linker->Input->Additional Dependencies" and I also set the path to the headers under "C/C++ -> General-> Additional Include Directories". But when I want to build my code, I get the following linker error: " LNK1181: cannot open file 'libboost_system.obj' ". Why is this happening? Is this object file missing in the archive? If yes, why? In particular I want to use libboost_filesystem-vc110-mt-1_54.lib, libboost_filesystem-vc110-mt-gd-1_54.lib, libboost_system-vc110-mt-1_54.lib and libboost_system-vc110-mt-gd-1.lib Thank you very much, Andy

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help using async_wait
by Lane 17 Nov '15

17 Nov '15

I'm trying to have a file automatically close when a deadline_timer is expired. Seeing that a file is no longer open, another file will get created and a timer started. But I'm having some issues understanding deadline_timer. I believe the io.run() in start_timer blocks (thinking that async_wait shouldn't block), so I tried to put it on it's own thread so that my main would continue to loop and write to the file while a timer is running in the background which would eventually close the file. Anyone see where I'm going wrong? --- void MyFileTimer::start_timer() { ba::deadline_timer timer(io, boost::posix_time::seconds(10)); timer.async_wait(boost::bind(&MyFileTimer::timer_expired, this, _1)); t_thread = unique_ptr<boost::thread>( new boost::thread(boost::bind(&ba::io_service::run, &io))); io.run(); } void MyFileTimer::timer_expired(const boost::system::error_code& e) { // Closing file my_file.flush(); my_file.close(); io.reset(); t_thread->join(); } bool MyFileTimer::create_file() { // ... string filename = my_unique_file_name; my_file.open(filename, ios::out); start_timer(); return true; } --- snip of main --- while (true) { if (!my_file.is_open()) { create_file(); } my_file->write(str); }

2 1

[Algorithm] Boyer-Moore Search - Does it use The Galil Rule?
by Vidya Wasi 14 Nov '15

14 Nov '15

Hi, I've been fiddling with search algorithms and am now relearning Boyer-Moore. From the documentation I cannot tell if the algorithm is using The Galil Rule. Since I'm still inexperienced in understanding the algorithm I'm wondering if the boost implementation do use The Galil Rule? Regards, Boost casual user

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Boost 1.60.0 beta 1 Release Candidate 3 available for testing
by Marshall Clow 14 Nov '15

14 Nov '15

Release candidate files for 1.60.0 beta 3 are available at http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. Changes since rc1: * Boost.Sprit has been updated and Boost.Log now builds. * Boost.Math has been updated and now builds. [ Note: The RC2 files that I posted yesterday were incorrectly produced. RC3 is identical to what RC2 should have been -- end note ] Known issues: * Errors when building libraries for visual studio: test and type_erasure. * Boost.Test fails when building on Darwin with gcc 4.9.2 The files (and associated md5s) are: MD5 (boost_1_60_0_b1_rc3.7z) = cfac18348700d0e6c1a0e4418a57e9aa MD5 (boost_1_60_0_b1_rc3.tar.bz2) = d3cb5a59e5b38555096814a6bfbcb441 MD5 (boost_1_60_0_b1_rc3.tar.gz) = db9b011547b8933454d0dfe31f7b8551 MD5 (boost_1_60_0_b1_rc3.zip) = 216c7cd0c15c096ece24d2649a272b51 Thanks! -- The release managers

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linker errors in vs2012 and boost 1.59...
by TUELLER, SHAYNE R CIV USAF AFMC 519 SMXS/MXDEC 12 Nov '15

12 Nov '15

All, I'm trying to compile my application which uses boost 1.59 prebuilt binaries for vs2012. Things compile and link just fine in debug mode but I'm having the following linker errors when I try to build in release mode... GRTXserver.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::container::container_detail::has_member_function_named_construct<clas s boost::container::new_allocator<char> >::BaseMixin::construct(void)" (?construct@BaseMixin@?$has_member_function_named_construct@V?$new_allocator @D@container@boost@@@container_detail@container@boost@@QEAAXXZ) 1>GRTXserver.obj : error LNK2001: unresolved external symbol "public: void __cdecl boost::container::container_detail::has_member_function_named_construct<clas s boost::container::new_allocator<struct boost::container::container_detail::tree_node<struct std::pair<class boost::container::basic_string<char,struct std::char_traits<char>,class boost::container::new_allocator<char> > const ,struct boost::interprocess::ipcdetail::ref_count_ptr>,void *,0,1> > >::BaseMixin::construct(void)" (?construct@BaseMixin@?$has_member_function_named_construct@V?$new_allocator @U?$tree_node@U?$pair@$$CBV?$basic_string@DU?$char_traits@D@std@@V?$new_allo cator@D@container@boost@@@container@boost@@Uref_count_ptr@ipcdetail@interpro cess@3@@std@@PEAX$0A@$00@container_detail@container@boost@@@container@boost@ @@container_detail@container@boost@@QEAAXXZ) 1>C:\GRTXserver\x64\Release\GRTXserver.exe : fatal error LNK1120: 2 unresolved externals I've tried everything but I just can't get it to work. Any ideas or is anyone else having this problem? Thanks, -Shayne

1 0

Boost 1.60.0 beta 1 Release Candidates available for testing
by Marshall Clow 11 Nov '15

11 Nov '15

Release candidate files for 1.60.0 beta 1 are available at http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. IMPORTANT NOTE: The files (and associated md5s) are: MD5 (boost_1_60_0_b1_rc1.7z) = ac6b2128d951ad688421fde2d878c2a7 MD5 (boost_1_60_0_b1_rc1.tar.bz2) = 2fc232f255f1ce8868315da207c05b6b MD5 (boost_1_60_0_b1_rc1.tar.gz) = d594e10f2761abaf957a67c6a223d2a4 MD5 (boost_1_60_0_b1_rc1.zip) = 16a2d512fca7995d5fa421d13f841b0f Thanks! -- The release managers

6 15

[coroutines2] Building coroutines2 examples
by Adi Shavit 10 Nov '15

10 Nov '15

Hi, I'm trying to build the Boost 1.59 coroutine and coroutine2 examples. I built boost with b2 (complete build) and am using CMake to generate a VC2015 project to build the samples. All the coroutine samples build and run just fine, but I get *linking* errors with the coroutine2 samples. My CMakeLists.txt file is straightforward, just find boost, include the headers and link to the boost libs: project (coroutines-samples) cmake_minimum_required(VERSION 2.8) find_package(Boost REQUIRED) include_directories(${Boost_INCLUDE_DIR}) link_directories(${Boost_LIBRARY_DIRS}) add_executable(chaining.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/chaining.cpp) add_executable(echo.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/echo.cpp) add_executable(exception.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/exception.cpp) add_executable(fibonacci.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/fibonacci.cpp) add_executable(layout.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/layout.cpp) add_executable(parallel.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/parallel.cpp) add_executable(power.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/power.cpp) add_executable(same_fringe.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/same_fringe.cpp) add_executable(segmented_stack.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/segmented_stack.cpp) add_executable(simple.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/simple.cpp) add_executable(unwind.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/asymmetric/unwind.cpp) add_executable(dice_game.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/dice_game.cpp) add_executable(merge_arrays.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/merge_arrays.cpp) add_executable(segmented_stack1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/segmented_stack.cpp) add_executable(simple1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/simple.cpp) add_executable(unwind1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp03/symmetric/unwind.cpp) add_executable(await_emu.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/await_emu.cpp) add_executable(fibonacci11.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/fibonacci.cpp) add_executable(iterator_range.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/iterator_range.cpp) add_executable(layout11.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/layout.cpp) add_executable(same_fringe11.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/asymmetric/same_fringe.cpp) add_executable(merge_arrays1.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/symmetric/merge_arrays.cpp) add_executable(simple2.cpp /some/path/boost_1_59_0/libs/coroutine/example/cpp11/symmetric/simple.cpp) # coroutines2 add_executable(coro2_fibonacci /some/path/boost_1_59_0/libs/coroutine2/example/fibonacci.cpp) add_executable(coro2_layout /some/path/boost_1_59_0/libs/coroutine2/example/layout.cpp) add_executable(coro2_parser /some/path/boost_1_59_0/libs/coroutine2/example/parser.cpp) add_executable(coro2_same_fringe /some/path/boost_1_59_0/libs/coroutine2/example/same_fringe.cpp) add_executable(coro2_segmented /some/path/boost_1_59_0/libs/coroutine2/example/segmented.cpp) add_executable(coro2_simple /some/path/boost_1_59_0/libs/coroutine2/example/simple.cpp) target_link_libraries(chaining.cpp ${Boost_LIBRARIES}) target_link_libraries(echo.cpp ${Boost_LIBRARIES}) target_link_libraries(exception.cpp ${Boost_LIBRARIES}) target_link_libraries(fibonacci.cpp ${Boost_LIBRARIES}) target_link_libraries(layout.cpp ${Boost_LIBRARIES}) target_link_libraries(parallel.cpp ${Boost_LIBRARIES}) target_link_libraries(power.cpp ${Boost_LIBRARIES}) target_link_libraries(same_fringe.cpp ${Boost_LIBRARIES}) target_link_libraries(segmented_stack.cpp ${Boost_LIBRARIES}) target_link_libraries(simple.cpp ${Boost_LIBRARIES}) target_link_libraries(unwind.cpp ${Boost_LIBRARIES}) target_link_libraries(dice_game.cpp ${Boost_LIBRARIES}) target_link_libraries(merge_arrays.cpp ${Boost_LIBRARIES}) target_link_libraries(segmented_stack1.cpp ${Boost_LIBRARIES}) target_link_libraries(simple1.cpp ${Boost_LIBRARIES}) target_link_libraries(unwind1.cpp ${Boost_LIBRARIES}) target_link_libraries(await_emu.cpp ${Boost_LIBRARIES}) target_link_libraries(fibonacci11.cpp ${Boost_LIBRARIES}) target_link_libraries(iterator_range.cpp ${Boost_LIBRARIES}) target_link_libraries(layout11.cpp ${Boost_LIBRARIES}) target_link_libraries(same_fringe11.cpp ${Boost_LIBRARIES}) target_link_libraries(merge_arrays1.cpp ${Boost_LIBRARIES}) target_link_libraries(simple2.cpp ${Boost_LIBRARIES}) target_link_libraries(coro2_fibonacci ${Boost_LIBRARIES}) target_link_libraries(coro2_layout ${Boost_LIBRARIES}) target_link_libraries(coro2_parser ${Boost_LIBRARIES}) target_link_libraries(coro2_same_fringe ${Boost_LIBRARIES}) target_link_libraries(coro2_segmented ${Boost_LIBRARIES}) target_link_libraries(coro2_simple ${Boost_LIBRARIES}) The linked does not seem to be able to find boost::system::system_category. This is my error log: 11>------ Build started: Project: coro2_fibonacci, Configuration: Debug x64 ------ 2>------ Build started: Project: coro2_layout, Configuration: Debug x64 ------ 3>------ Build started: Project: coro2_parser, Configuration: Debug x64 ------ 4>------ Build started: Project: coro2_same_fringe, Configuration: Debug x64 ------ 5>------ Build started: Project: coro2_segmented, Configuration: Debug x64 ------ 6>------ Build started: Project: coro2_simple, Configuration: Debug x64 ------ 1>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 1>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_fibonacci.exe : fatal error LNK1120: 1 unresolved externals 4>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 4>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_same_fringe.exe : fatal error LNK1120: 1 unresolved externals 6>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 2>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 3>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 5>libboost_context-vc140-mt-gd-1_59.lib(stack_traits.obj) : error LNK2019: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system @boost@@YAAEBVerror_category@12@XZ) referenced in function "public: __cdecl boost::thread_exception::thread_exception(int,char const *)" (??0thread_exception@boost@@QEAA@HPEBD@Z) 6>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_simple.exe : fatal error LNK1120: 1 unresolved externals 2>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_layout.exe : fatal error LNK1120: 1 unresolved externals 3>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_parser.exe : fatal error LNK1120: 1 unresolved externals 5>\some\path\Coroutines\build\vs2015.x64\Debug\coro2_segmented.exe : fatal error LNK1120: 1 unresolved externals 7>------ Skipped Build: Project: ALL_BUILD, Configuration: Debug x64 ------ 7>Project not selected to build for this solution configuration ========== Build: 0 succeeded, 6 failed, 25 up-to-date, 1 skipped ========== What am I doing wrong? Thanks, Adi

1 0

Using boost on AIX with GCC
by Chris Franz 10 Nov '15

10 Nov '15

I'm trying to get started using boost on AIX with GCC. What I seem to be running into is that GCC has a "feature" on AIX such that system headers are wrappered with an implicit 'extern "C"'. I'm not finding a good way to include the boost headers because of this feature. As an example, using about the simplest boost header I could find: $ echo "#include <boost/function_equal.hpp>" > fe.cpp $ g++ fe.cpp -c -isystem/usr/local/include/boost-1_59 In file included from fe.cpp:1:0: /usr/local/include/boost-1_59/boost/function_equal.hpp:15:1: error: template with C linkage template<typename F, typename G> ^ /usr/local/include/boost-1_59/boost/function_equal.hpp:22:1: error: template with C linkage template<typename F, typename G> ^ $ One obvious possibility is to use -I instead of -isystem, but not treating boost headers as system headers results in a multitude of warnings using the verbosity we like to use (I've even run into some boost headers that emit errors if -pedantic-errors is specified). Do I need a different version of gcc and/or boost? How do other people configure this?

2 1

Newbie not able to compile mini_c example
by Dezai G 09 Nov '15

09 Nov '15

Hi boost usersIm newbye in using boost spirit.I have recenly downloaded boost 1.59 library. Im tryng than to compile the mini_c example both on windows with visual studio 2008 and on linux with gcc 4.4.6Im walking throught plenty of errors and didnt found in the documentation what is going wrong.I ve tryed several things throuh search in google but nothing seems to walk An example of error is for linux/gcc : boost_1_59_0/boost/utility/result_of.hpp:190: error: wrong number of template arguments (1, should be 3) Are my compilers incompatible with boost 1.59. In this case what should i use And what are the correct version of library should i use to be fully compliant with visual studio 2à08 or gcc 4.4.6 Best regardsDZ

1 0

[BGL] Connected components of a distributed graph with few edges
by Quaglino Alessio 06 Nov '15

06 Nov '15

Hello, I am trying to compute the number of connected components of a graph with only few edges (i.e. many vertices do not have edges). This works OK for a non-distributed graph. The simplest example of the issue I could come up with is the following: typedef adjacency_list <vecS, vecS, undirectedS> SerialGraph; typedef adjacency_list<vecS, distributedS<mpi_process_group, vecS>, undirectedS> Graph; typedef iterator_property_map<std::vector<int>::iterator, property_map<Graph, vertex_index_t>::type> LocalMap; #ifdef PARALLEL_GRAPH Graph G(nV+1); synchronize(G); std::vector<int> localComponent(nV+1); LocalMap components(localComponent.begin(),get(vertex_index, G)); num = connected_components_ps(G, components); #else SerialGraph G(nV+1); std::vector<int> globalComponent(nV+1); num = connected_components(G, &globalComponent[0]); #endif The distributed version causes a seg fault when calling connected_components_ps, while the non-distributed works fine and correctly finds nV+1 components. If I populate the graph connecting all vertices with edges, both do work fine. What am I doing wrong? Thank you in advance. Regards, Alessio

2 8

BGL, Johnson all pair shortest path and C
by Paolo Bolzoni 05 Nov '15

05 Nov '15

Dear list, I have to use johnson all pair shortest path[1] to have the all pair distance matrix and pass it to a C function. Here is the problem, the C function expect a row-order array, while the Johnson expect a BasicMatrix[2] that understands the m[row][col] syntax. I solved it as shown in the bottom of the email, but it seems so convoluted, is there a simpler way I missed? Yours faithfully, Paolo [1] http://www.boost.org/doc/libs/release/libs/graph/doc/johnson_all_pairs_shor… [2] http://www.boost.org/doc/libs/release/libs/graph/doc/BasicMatrix.html /* -------------- */ //p is the graph //distance_matrix is a std vector auto size = boost::num_vertices(p); Matrix distance_matrix1(distance_matrix, size, size); MatrixR distance_matrix_wrapper(distance_matrix1); //pass distance_matrix_wrapper to johnson algorithm. /* -------------- */ struct Matrix { Matrix(std::vector<int64_t>& storage, size_t rows, size_t columns) : m_{storage}, columns_{columns} { m_.clear(); m_.resize(rows * columns_, int64_t{0}); } int64_t& get(size_t row, size_t column) { return m_[row * columns_ + column]; } std::vector<int64_t>& m_; size_t columns_; }; struct MatrixR; struct MatrixRR { MatrixRR(MatrixR const& m, size_t column) : m_{m}, column_{column} {} int64_t& operator[] (size_t row) const; MatrixR const& m_; size_t column_; }; struct MatrixR { MatrixR(Matrix& m) : m_{m} {} MatrixRR operator[] (size_t column) const { return MatrixRR(*this, column); } Matrix& m_; }; int64_t & MatrixRR :: operator[] (size_t row) const { return m_.m_.get(row, column_); }

1 0

Cannot get boost::asio::read_until to properly read a line. [new to boost/asio]
by Nick Chambers 04 Nov '15

04 Nov '15

Hello everyone! I'm writing an IRC framework (still in very rough, early stages), and am having trouble reading a single line from the server (in this case irc.freenode.net:6667). Ideally, I would get output that looks like the following: > :wolfe.freenode.net NOTICE * :*** Looking up your hostname... > :wolfe.freenode.net NOTICE * :*** Checking Ident > :wolfe.freenode.net NOTICE * :*** Your forward and reverse DNS do not > match, ignoring hostname > :wolfe.freenode.net NOTICE * :*** No Ident response > :wolfe.freenode.net 001 foobarbazball :Welcome to the freenode Internet > Relay Chat Network foobarbazball > :wolfe.freenode.net 002 foobarbazball :Your host is wolfe.freenode.net[ > 91.217.189.44/6667], running version ircd-seven-1.1.3 > :wolfe.freenode.net 003 foobarbazball :This server was created Sun Aug 2 > 2015 at 18:58:22 UTC > :wolfe.freenode.net 004 foobarbazball wolfe.freenode.net ircd-seven-1.1.3 > DOQRSZaghilopswz CFILMPQSbcefgijklmnopqrstvz bkloveqjfI > :wolfe.freenode.net 005 foobarbazball CHANTYPES=# EXCEPTS INVEX > CHANMODES=eIbq,k,flj,CFLMPQScgimnprstz CHANLIMIT=#:120 PREFIX=(ov)@+ > MAXLIST=bqeI:100 MODES=4 NETWORK=freenode KNOCK STATUSMSG=@+ CALLERID=g > :are supported by this server > :wolfe.freenode.net 005 foobarbazball CASEMAPPING=rfc1459 CHARSET=ascii > NICKLEN=16 CHANNELLEN=50 TOPICLEN=390 ETRACE CPRIVMSG CNOTICE DEAF=D > MONITOR=100 FNC > TARGMAX=NAMES:1,LIST:1,KICK:1,WHOIS:1,PRIVMSG:4,NOTICE:4,ACCEPT:,MONITOR: > :are supported by this server > :wolfe.freenode.net 005 foobarbazball EXTBAN=$,ajrxz WHOX CLIENTVER=3.0 > SAFELIST ELIST=CTU :are supported by this server > :wolfe.freenode.net 251 foobarbazball :There are 153 users and 93407 > invisible on 27 servers > :wolfe.freenode.net 252 foobarbazball 24 :IRC Operators online > :wolfe.freenode.net 253 foobarbazball 8 :unknown connection(s) > :wolfe.freenode.net 254 foobarbazball 54832 :channels formed > :wolfe.freenode.net 255 foobarbazball :I have 6701 clients and 1 servers > :wolfe.freenode.net 265 foobarbazball 6701 7241 :Current local users > 6701, max 7241 > :wolfe.freenode.net 266 foobarbazball 93560 97293 :Current global users > 93560, max 97293 > :wolfe.freenode.net 250 foobarbazball :Highest connection count: 7242 > (7241 clients) (668628 connections received) > :wolfe.freenode.net 375 foobarbazball :- wolfe.freenode.net Message of > the Day - > :wolfe.freenode.net 372 foobarbazball :- Welcome to wolfe.freenode.net in > Stockholm, SE. > :wolfe.freenode.net 372 foobarbazball :- Thanks to > http://www.portlane.com/ for sponsoring > :wolfe.freenode.net 372 foobarbazball :- this server! > :wolfe.freenode.net 372 foobarbazball :- > :wolfe.freenode.net 372 foobarbazball :- WOLFE, GENE [1931-]. Prolific > writer of short stories and > :wolfe.freenode.net 372 foobarbazball :- novels. His best-known work is > the multi-volume novel The > :wolfe.freenode.net 372 foobarbazball :- Book of the New Sun. He has won > multiple awards including > :wolfe.freenode.net 372 foobarbazball :- the Nebula Award, the World > Fantasy Award, The Campell > :wolfe.freenode.net 372 foobarbazball :- Memorial Award and the Locus > Award. He was awarded the World > :wolfe.freenode.net 372 foobarbazball :- Fantasy Award for lifetime > achievement in 1996. > :wolfe.freenode.net 372 foobarbazball :- > :wolfe.freenode.net 372 foobarbazball :- Welcome to freenode - supporting > the free and open source > :wolfe.freenode.net 372 foobarbazball :- software communities since 1998. > :wolfe.freenode.net 372 foobarbazball :- > :wolfe.freenode.net 372 foobarbazball :- By connecting to freenode you > indicate that you have read and > :wolfe.freenode.net 372 foobarbazball :- accept our policies as set out > on http://www.freenode.net > :wolfe.freenode.net 372 foobarbazball :- freenode runs an open proxy > scanner. Please join #freenode for > :wolfe.freenode.net 372 foobarbazball :- any network-related questions or > queries, where a number of > :wolfe.freenode.net 372 foobarbazball :- volunteer staff and helpful > users will be happy to assist you. > :wolfe.freenode.net 372 foobarbazball :- > :wolfe.freenode.net 372 foobarbazball :- You can meet us at FOSSCON ( > http://www.fosscon.org) where we get > :wolfe.freenode.net 372 foobarbazball :- together with like-minded FOSS > enthusiasts for talks and > :wolfe.freenode.net 372 foobarbazball :- real-life collaboration. > :wolfe.freenode.net 372 foobarbazball :- > :wolfe.freenode.net 372 foobarbazball :- We would like to thank Private > Internet Access > :wolfe.freenode.net 372 foobarbazball :- ( > https://www.privateinternetaccess.com/) and the other > :wolfe.freenode.net 372 foobarbazball :- organisations that help keep > freenode and our other projects > :wolfe.freenode.net 372 foobarbazball :- running for their sustained > support. > :wolfe.freenode.net 372 foobarbazball :- > :wolfe.freenode.net 372 foobarbazball :- In particular we would like to > thank the sponsor > :wolfe.freenode.net 372 foobarbazball :- of this server, details of which > can be found above. > :wolfe.freenode.net 372 foobarbazball :- > :wolfe.freenode.net 376 foobarbazball :End of /MOTD command. > :foobarbazball MODE foobarbazball :+i > My output on the other hand looks more like: > :sendak.freenode.net NOTICE * :*** Looking up your hostname... > :sendak.freenode.net NOTICE * :*** Checking Ident > :sendak.freenode.net NOTICE * :*** No Ident response > :sendak.freenode.net 001 squawker :Welcome to the freenode Internet Relay > Chat Network squawker > Ibq,k,flj,CFLMPQScgimnprstz CHANLIMIT=#:120 PREFIX=(ov)@+ MAXLIST=bqeI:100 > MODES=4 NETWORK=freenode KNOCK STATUSMSG=@+ CALLERID=g :are supported by > this server > upported by this server > 93546, max 95827 > freenode.net 372 squawker :- SENDAK, MAURICE [1928-2012]. The author of > Seven Little > 372 squawker :- Welcome to freenode - supporting the free and open source > wker :- any network-related questions or queries, where a number of > sendak.freenode.net 372 squawker :- We would like to thank Private > Internet Access > :- of this server, details of which can be found above. > main.cpp: > #include <IRCClient/client.hpp> > /* > #include <IRCClient/logger.hpp> > #include <IRCClient/plugin.hpp> > */ > > int main(int argc, char *argv[]) { > /* > if(argc > 2) { > logger::log(logger::output_type::STDERR, "usage: {1} > [config_file]", argv[0]); > return 1; > } > */ > client::irc bot( > "irc.freenode.net", // server to connect to > "6667", // port to connect on > "", // password > false, // don't connect with ssl > "squawker", // nick > "squawker", // realname > "A c++11 Utility bot written by nchambers", // ident > "#cplusplus.com", // channels to join > "." // command prefix > ); > > bot.on_connect([&bot]() -> void { > bot.nickserv(client::ns::identify, <REDACTED>); > }); > /* > bot.add_handler(client::input_type::privmsg, [](std::string channel, > std::string user, std::string msg) -> void { > logger::log(logger::output_type::STDOUT, "[{1}/{2}] {3}", user, > channel, msg); > }); > > bot.add_handler(client::input_type::command, "load", > [&bot](std::string channel, std::string user, std::string msg) -> void { > bot.load_plugin(plugin::plugin(msg)); > > if(bot.plugin_operation_successful()) { > logger::log(logger::output_type::STDOUT, "successfully loaded > plugin {1}", msg); > bot.msg(channel, "{1}: successfully loaded plugin {2}", user, > msg); > } > > else { > logger::log(logger::output_type::STDERR, "failure to load > plugin {1}", msg); > bot.msg(channel, "{1}: failure to load plugin {2}", user, msg); > } > }); > > bot.add_handler(client::input_type::command, "unload", > [&bot](std::string channel, std::string user, std::string msg) -> void { > bot.unload_plugin(plugin::plugin(msg)); > > if(bot.plugin_operation_successful()) { > logger::log(logger::output_type::STDOUT, "successfully > unloaded plugin {1}", msg); > bot.msg(channel, "{1}: successfully unloaded plugin {2}", > user, msg); > } > > else { > logger::log(logger::output_type::STDERR, "failure to unload > plugin {1}", msg); > bot.msg(channel, "{1}: failure to unload plugin {2}", user, > msg); > } > }); > > bot.add_handler(client::input_type::command, "reload", > [&bot](std::string channel, std::string user, std::string msg) -> void { > bot.reload_plugin(plugin::plugin(msg)); > > if(bot.plugin_operation_successful()) { > logger::log(logger::output_type::STDOUT, "successfully > reloaded plugin {1}", msg); > bot.msg(channel, "{1}: successfully reloaded plugin {2}", > user, msg); > } > > else { > logger::log(logger::output_type::STDERR, "failure to reload > plugin {1}", msg); > bot.msg(channel, "{1}: failure to reload plugin {2}", user, > msg); > } > });*/ > > bot.run(); > return 0; > } > client.hpp: > #ifndef _ROOT_SQUAWKER_IRCCLIENT_CLIENT_HPP__ > #define _ROOT_SQUAWKER_IRCCLIENT_CLIENT_HPP__ > > #include <string> > #include <functional> > > #include <boost/asio.hpp> > > namespace client { > enum class ns: int { > identify=0, > }; > > enum class input_type: int { > privmsg=0, > }; > > class irc { > public: > irc(std::string, std::string, std::string, bool, std::string, > std::string, std::string, std::string, std::string); > > void on_connect(std::function<void()>); > void nickserv(client::ns, std::string); > void run(); > > void send(std::string); > > private: > void connect(); > std::string readline(); > > std::string server; > std::string port; > std::string pass; > bool use_ssl; > std::string nick; > std::string realname; > std::string ident; > std::string channels; > std::string prefix; > std::function<void()> on_connect_callback; > boost::asio::io_service io_service; > boost::asio::ip::tcp::socket socket; > }; > } > > #endif > client.cpp: > #include <IRCClient/client.hpp> > #include <iostream> > #include <sstream> > #include <array> > > client::irc::irc( > std::string server, std::string port, std::string pass, > bool use_ssl, std::string nick, std::string realname, > std::string ident, std::string channels, std::string prefix > ) : > server(server), port(port), pass(pass), > use_ssl(use_ssl), nick(nick), realname(realname), > ident(ident), channels(channels), prefix(prefix), > on_connect_callback([]()->void{}), socket(this->io_service) { > } > > void client::irc::on_connect(std::function<void()> on_connect_callback) { > this->on_connect_callback = on_connect_callback; > } > > void client::irc::nickserv(client::ns command, std::string arguments) { > switch(command) { > case client::ns::identify: > this->send("nickserv identify " + arguments); > break; > } > } > > void client::irc::run() { > this->connect(); > > while(true) { > std::array<char, 128> buf; > boost::system::error_code error; > size_t len = this->socket.read_some(boost::asio::buffer(buf), > error); > > if(error == boost::asio::error::eof) { > break; > } > > else if (error) { > throw boost::system::system_error(error); > } > > std::cout.write(buf.data(), len); > } > } > > void client::irc::send(std::string msg) { > this->socket.write_some(boost::asio::buffer(msg + > std::string("\r\n"))); > } > > void client::irc::connect() { > boost::asio::ip::tcp::resolver resolver(this->io_service); > boost::asio::ip::tcp::resolver::query query(this->server, this->port); > boost::asio::ip::tcp::resolver::iterator endpoint_iterator = > resolver.resolve(query); > > boost::asio::connect(this->socket, endpoint_iterator); > this->send("NICK " + this->nick); > this->send("USER " + this->realname + " * * :" + this->ident); > > while(true) { > std::string line = this->readline(); > std::cout << line << std::endl; > > if(line == ":squawker MODE squawker :+i") { > break; > } > } > > this->on_connect_callback(); > } > > std::string client::irc::readline() { > boost::asio::streambuf buffer; > size_t received = boost::asio::read_until(this->socket, buffer, > "\r\n"); > std::istream is(&buffer); > std::string line; > std::getline(is, line); > return std::string(std::begin(line), std::end(line)-1); > } > any help would be very much appreciated! thank you in advance!

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[BGL] Correct idiom for working with vertices.
by Matthew Markland 04 Nov '15

04 Nov '15

All: I'm building a graph on which I will be running betweenness centrality. This graph consists of a number of edges represented as pairs. For example 1 20 15 10 would represent an edge from 1<->20 and one from 15<->10. These are bidirectional. My initial code created a property_map for the centrality results and then walked through that map using num_vertices(g) as the limit for the for-loop. What I've realized now, though, is that when BGL generates the values for num_vertices (and the iterators for vertices also), it "fills in" the gaps. So, in the graph above there would be 20 vertices that would be interated through even though most of those have no relation to edges in the graph. So, I'm wondering what the usual idiom is in this situation. Should I instead iterator over edges and pull information from the source and target vertices of the edges? Thanks in advance for the information! Matt ---- Matthew Markland mwmarkland(a)outlook.com

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Re: [Boost-users] Crashing Issue
by swati upadhyaya 04 Nov '15

04 Nov '15

hi I am using like this where RunningThreads_ is vector containing boost thread object pointer(handler).I am using interrupt() for the interruption of thread interruption_point() catching that interruption then joining.everytime its crashing in join() for me but for others who have the same configuration its working fine all of us has windos 8. For me also it was working last week but this week the same piece of code is crashing. :( RunningThreads_[i].handle->interrupt(); RunningThreads_[i].handle->join(); delete RunningThreads_[i].handle; On Thu, Feb 5, 2015 at 9:31 AM, swati upadhyaya <swatiupadhyaya(a)gmail.com> wrote: > RunningThreads_[i].handle->interrupt(); > LOG4CPLUS_INFO(root, "Thread Interrupted for " << > RunningThreads_[i].app_name << " successful"); > RunningThreads_[i].handle->join(); > LOG4CPLUS_INFO(root, "Waiting for thread to exit " << > RunningThreads_[i].app_name << " successful"); > delete RunningThreads_[i].handle; > LOG4CPLUS_INFO(root, "Thread handle for " << > RunningThreads_[i].app_name << " successfully deleted"); > //RunningThreads_.erase(i); > > On Wed, Feb 4, 2015 at 12:10 AM, Vicente J. Botet Escriba < > vicente.botet(a)wanadoo.fr> wrote: > >> Le 03/02/15 09:10, swati upadhyaya a écrit : >> >> In my code join() timed_joined() is crashing, I am using these API >> after interrupt(),Same piece of code is working for others but in my system >> its crashing, >> Is there some dependency problem I am using >> Boost version: 1.55.0 >> OS: Windows 8 >> IDE: Visual Studio 2010 >> >> Hi, >> >> it could help if you post the example and the backtrace. >> >> Which version/OS/compiler use others for which this works? >> >> Vicente >> >> _______________________________________________ >> Boost-users mailing list >> Boost-users(a)lists.boost.org >> http://lists.boost.org/mailman/listinfo.cgi/boost-users >> > >

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[boost-test] print list of names of failing tests on failure
by Steve Lorimer 03 Nov '15

03 Nov '15

I don't believe there is currently a way to print only the list of tests which failed. --report_level=short only prints the numbers of passed and failing tests --report_level=detailed prints a very verbose list of all tests Is there a middle ground which will give me the names of tests which have failed, but not those which have passed? Something along the lines of: Test module "Master Test Suite" has failed with: 1 test case out of 9 failed 1 test case out of 9 aborted 1 assertion out of 30 failed Test case "foo_test" was aborted with: 1 assertion out of 1 failed TIA Steve

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[boost::asio] [stream::ssl] stackful coroutine yield from SSL handshake in servername callback
by SamJam Liddicott 03 Nov '15

03 Nov '15

I'm testing a spoofing MITM SSL proxy based on boost::asio and boost::asio::stream::ssl, using boost 1.55 I register the tlsext_servername_callback, so that I can observe the called name during SSL handshake with the client. In the callback, I have the information needed to either get/create an appropriate SSL_CTX with certificates to use with the client, or start an SSL handshake with the server, to obtain the server certificate for re-signing and then put that back into the SSL_CTX to be passed to the client, before returning the tlsext_servername callback. It is clear that I must block the tlsext_servername callback from returning until I have the new SSL_CTX ready, which could take some time if I need to wait on a handshake with the real server. I can block return by performing a blocking handshake with the server, but then I consume one of the io_service threads merely blocking, and I don't want to waste them like that. I can successfully run it all as a new thread using blocking IO, in this form: ssl_connect(...) { boost::thread([...]() ({ sni_callback = [...](std::string server_name) { server.handshake(...); SSL_set_SSL_CTX(client.native_handle(), server.ctx)); }; client_socket.handshake(...); handler(); // really done by io_service.post }).detach(); } But I want to use stackful coroutines in the belief that thay are less costly and that I will be able to have more connections in progress (though I may have to link with BoringSSL). Using a coroutine spawn, I can convert the handshake with the server, like this: ssl_connect(...) { boost::asio::spawn(my_strand, [...](boost::asio::yield_context yield) { sni_callback = [...](std::string server_name) { server.async_handshake(..., yield[ec]); // <---- works nicely SSL_set_SSL_CTX(client.native_handle(), server.ctx)); }; client_socket.handshake(...); handler(); // really done by io_service.post }); } but the handshake with the client must remain blocking, otherwise, with: client_socket.async_handshake(..., yield[ec]); I get segfaults in the coroutine with unhelpful stack traces, mentioning only some SSL cleanup functions. However if the client connection hangs, then the client handshake can still hang and block a worker thread. My guess is that if the handshake with the client is not blocking, the SNI callback does not occur on the coroutine, and so I cannot properly block the return and possibly the use of yield in the SNI callback is invalid. If there is a solution that doesn't involve patching either libssl or stream::ssl, it will involve some asio_invoke_handler hooks. However, for that to work, the coroutine would have to be activated, but not to complete the async_handshake call. Instead it would be activated to handle the handshake read completion, leading to the parsing, SNI callback & return, further handshake write, and yield back to the io_service. I don't know if the coroutine/strand implementation can even do that -- be activated for work and not for return. So my first question is: is it likely possible to make coroutine do this? Looking in boost source detail/io.hpp for case engine::want_input_and_retry I notice: next_layer_.async_read_some( boost::asio::buffer(core_.input_buffer_), BOOST_ASIO_MOVE_CAST(io_op)(*this)); which seems to make no attempt to use asio_hanlder_invoke to allow it to be hooked, so that might need fixing. What sort of asio_handler_invoke hook would cause the handler to be invoked on the coroutine? Could strand.dispatch() do it? If it would, I'm not sure how to write such a hook either to work with argument dependent lookup, or to invoke in the coroutine. Otherwise I may as well stick to starting a scope-limited thread, and using blocking handshake operations. But I like to know the limits... Samjam

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boost::math::cyl_bessel_j_zero: few NaN
by campagne 02 Nov '15

02 Nov '15

double order = (double)lcur + 0.5; unsigned int n_zeros; vector<double> zeros; boost::math::cyl_bessel_j_zero(order,1,n_zeros, back_inserter(zeros)); I'am running Boost 1.59 on Mac OS X Maverick for lcur = 0, I expect zeros filed with Pi, 2 Pi, 3Pi.... but the first two zeros I get NaN I get also other nan as for the 2nd zeros for lcur=1 Have you experienced such problem or I have a memory leak somewhere ? Thanks JE

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