November 2011 - Boost - lists.boost.org

leak in win32 detail::basic_condition_variable
by Kenneth Porter 10 Nov '11

10 Nov '11

I'm finding that an element in the CV's generation_list is left orphaned sometimes when the CV is destroyed. I'm running Visual Leak Detector and it gives this stack dump of the allocation point of the leaked object: c:\devel\boost\boost_1_46_1\boost\thread\win32\condition_variable.hpp (172): boost::detail::basic_condition_variable::get_wait_entry c:\devel\boost\boost_1_46_1\boost\thread\win32\condition_variable.hpp (211): boost::detail::basic_condition_variable::do_wait<boost::unique_lock <boost::mutex> > + 0xC bytes c:\devel\boost\boost_1_46_1\boost\thread\win32\condition_variable.hpp (369): boost::condition_variable_any::wait<boost::unique_lock<boost::mutex> > c:\devel\boost\boost_1_46_1\boost\thread\win32\condition_variable.hpp (374): boost::condition_variable_any::wait<boost::unique_lock <boost::mutex>,boost::_bi::bind_t<bool,boost::_mfi::cmf0 <bool,bounded_buffer<Axis::Report> >,boost::_bi::list1<boost::_bi::value <bounded_buffer<Axis: + 0x1B bytes I compared the source file against trunk and it hasn't changed.

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asio ipv6 anycast
by Julian Faude 10 Nov '11

10 Nov '11

Hi, I am working on a project which depends on IPv6 anycast. In linux IPv6 anycast is available through a socket options called IPV6_JOIN_ANYCAST and IPV6_LEAVE_ANYCAST. Like the multicast option it's based on the ipv6_mreq struct. If I'm not mistaken there is no ipv6 anycast socket option in asio. Am I right? Is anybody working on it? Best, Julian

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[Test] Darwin Intel 11.1
by Belcourt, K. Noel 09 Nov '11

09 Nov '11

Hi, I've attached a patch that appears to fix problems with about 20 Boost libraries on trunk that depend on Boost.Test. This patch simply removes an argument to format_report(). The trunk tests (http://www.boost.org/development/tests/trunk/developer/summary.html ) currently reflect this patch. I've added this patch to the nightly trunk testing patch script until such time as we get this committed to trunk. -- Noel

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Fw: [atomic] review results
by Peter Dimov 09 Nov '11

09 Nov '11

-----Original Message----- From: Peter Dimov Sent: Monday, November 07, 2011 22:38 To: Helge Bahmann Subject: Re: [boost] [atomic] review results Helge Bahmann wrote: > yes makes sense -- there was a concern raised by Andrey Semashev that the > spinlock pool as implemented and used by shared_ptr presently may fail on > Windows due to the pool being non-unique (not had a chance to test this > yet), > and I have found a way to produce a similar failure using dlopen, atomics > private to shared libraries and RTLD_LOCAL -- currently I am therefore > leaning on creating a shared library just for the spinlock pool, but since > you wrote the initial implementation maybe you could comment as well? This is a problem in principle, but requiring all users of shared_ptr to link to a shared library is a non-starter. I wouldn't use such a shared_ptr, and I doubt many others will. And I wouldn't be surprised if this sentiment applies to Boost.Atomic as well.

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[parameter] type requirement compiler error
by lcaminiti 08 Nov '11

08 Nov '11

Hello all, The following parameter type requirement: (required (graph, *) ) (optional (root_vertex, (typename boost::graph_traits<graph_type>::vertex_descriptor), *boost::vertices(graph).first) ) Generates a GCC error: dfs.05.cpp:40: error: ‘graph_type’ was not declared in this scope Detailed code and error below. In fact, if I look at the code after pp, I can see that graph_type is define only after the type requirement is checked... why? What am I doing wrong? Thanks a lot! --Lorenzo #include <boost/graph/adjacency_list.hpp> #include <boost/graph/depth_first_search.hpp> #include <boost/range/irange.hpp> #include <boost/pending/indirect_cmp.hpp> #include <boost/parameter.hpp> #include <iostream> namespace graphs { BOOST_PARAMETER_NAME(graph) BOOST_PARAMETER_NAME(visitor) BOOST_PARAMETER_NAME(root_vertex) BOOST_PARAMETER_NAME(index_map) BOOST_PARAMETER_NAME(color_map) template< typename Size, typename IndexMap > boost::iterator_property_map<boost::default_color_type*, IndexMap, boost::default_color_type, boost::default_color_type&> default_color_map ( Size const& num_vertices, IndexMap const& index_map ) { std::vector<boost::default_color_type> colors(num_vertices); return &colors[0]; } BOOST_PARAMETER_FUNCTION( (void), depth_first_search, tag, (required (graph, *)) (optional (visitor, *, boost::dfs_visitor<>()) (root_vertex, (typename boost::graph_traits<graph_type>::vertex_descriptor), *boost::vertices(graph).first) (index_map, *, boost::get(boost::vertex_index, graph)) (in_out(color_map), *, default_color_map(boost::num_vertices(graph), index_map)) ) ) { std::cout << "here\n"; boost::depth_first_search(graph, boost::visitor(visitor). color_map(color_map).root_vertex(root_vertex). vertex_index_map(index_map)); } } // namespace graphs template< typename TimeMap > class dfs_time_visitor : public boost::default_dfs_visitor { typedef typename boost::property_traits< TimeMap >::value_type T; public: dfs_time_visitor(TimeMap dmap, TimeMap fmap, T& t) : dmap_(dmap), fmap_(fmap), time_(t) {} template< typename V, typename G > void discover_vertex ( V u, G const& g ) const { put(dmap_, u, time_++); } template< typename V, typename G > void finish_vertex ( V u, G const& g ) const { put(fmap_, u, time_++); } TimeMap dmap_; TimeMap fmap_; T& time_; }; using namespace boost; int main ( ) { typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS> G; typedef boost::graph_traits<G>::vertices_size_type size_type; enum {u, v, w, x, y, z, N}; char names[] = {'u', 'v', 'w', 'x', 'y', 'z'}; typedef std::pair<int, int> E; E edges[] = {E(u, v), E(u, x), E(x, v), E(y, x), E(v, y), E(w, y), E(w, z), E(z, z)}; G g(edges, edges + sizeof(edges) / sizeof(E), N); std::vector<size_type> dtime(boost::num_vertices(g)); std::vector<size_type> ftime(boost::num_vertices(g)); size_type t = 0; dfs_time_visitor<size_type*> vis(&dtime[0], &ftime[0], t); graphs::depth_first_search(g, vis); std::vector<size_type> dorder(N); boost::integer_range<size_type> r(0, N); std::copy(r.begin(), r.end(), dorder.begin()); std::sort(dorder.begin(), dorder.end(), boost::indirect_cmp<size_type*, std::less<size_type> >(&dtime[0])); std::cout << "order of discovery: "; for(int i = 0; i < N; ++i) std::cout << names[dorder[i]] << " "; std::cout << std::endl; std::vector<size_type> forder(N); std::copy(r.begin(), r.end(), forder.begin()); std::sort(forder.begin(), forder.end(), boost::indirect_cmp<size_type*, std::less<size_type> >(&ftime[0])); std::cout << "order of finish: "; for(int i = 0; i < N; ++i) std::cout << names[forder[i]] << " "; std::cout << std::endl; return 0; } $ g++ -Wall -I../../../../../boost-trunk.cygwin dfs.05.cpp dfs.05.cpp:40: error: ‘graph_type’ was not declared in this scope dfs.05.cpp:40: error: template argument 1 is invalid dfs.05.cpp:40: error: expected `::' before ‘,’ token dfs.05.cpp:40: error: expected identifier before ‘,’ token dfs.05.cpp:40: error: template argument 3 is invalid dfs.05.cpp:40: error: expected `::' before ‘{’ token dfs.05.cpp:40: error: expected class-name before ‘{’ token ../../../../../boost-trunk.cygwin/boost/parameter/preprocessor.hpp: In instantiation of ‘boost::parameter::aux::argument_pack<graphs::boost_param_params_40depth_first_search<int>, const boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::no_property, boost::no_property, boost::no_property, boost::listS>, const dfs_time_visitor<main::size_type*>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>’: dfs.05.cpp:88: instantiated from here ../../../../../boost-trunk.cygwin/boost/parameter/preprocessor.hpp:157: error: no type named ‘parameter_spec0’ in ‘struct graphs::boost_param_params_40depth_first_search<int>’ ../../../../../boost-trunk.cygwin/boost/parameter/preprocessor.hpp:158: error: no type named ‘parameter_spec0’ in ‘struct graphs::boost_param_params_40depth_first_search<int>’ ../../../../../boost-trunk.cygwin/boost/parameter/preprocessor.hpp: In instantiation of ‘boost::parameter::aux::argument_pack<graphs::boost_param_params_40depth_first_search<int>, const boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::no_property, boost::no_property, boost::no_property, boost::listS>, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>’: dfs.05.cpp:88: instantiated from here ../../../../../boost-trunk.cygwin/boost/parameter/preprocessor.hpp:157: error: no type named ‘parameter_spec0’ in ‘struct graphs::boost_param_params_40depth_first_search<int>’ ../../../../../boost-trunk.cygwin/boost/parameter/preprocessor.hpp:158: error: no type named ‘parameter_spec0’ in ‘struct graphs::boost_param_params_40depth_first_search<int>’ dfs.05.cpp: In function ‘int main()’: dfs.05.cpp:88: error: no matching function for call to ‘depth_first_search(main()::G&, dfs_time_visitor<size_type*>&)’ -- View this message in context: http://boost.2283326.n4.nabble.com/boost-parameter-type-requirement-compile… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[1.48 lexical_cast] Illegal Derefence
by Olaf van der Spek 08 Nov '11

08 Nov '11

Hi, This does an illegal dereference in boost\lexical_cast.hpp(1357): if ( Traits::eq(minus,*start) ) #include <boost/lexical_cast.hpp> #include <boost/range/iterator_range.hpp> int main() { boost::iterator_range<const char*> v; boost::lexical_cast<int>(v); } -- Olaf

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Boost interprocess: Segmentation fault
by thuannv 08 Nov '11

08 Nov '11

Hi everybody, I am beginner to develop with boost library. I am working with shared memory (boost.interprocess). So, I got error in executing and could anyone help me solve this problem? My problem is: - I wrote 2 process named SHMWriter and SHMReader. + SHMWwriter: write a map (int, int) into the SHM. + SHMReader: read the map value from SHM. - I executed the SHMWriter then SHMReader. - SHMWriter successfully executed. But, SHMWriter always executed failed (error: Segmentation fault). - The sources code are listed below: //SHMWriter: -------------------------------------------- typedef std::pair<int, int> MapValue; typedef allocator<MapValue, managed_shared_memory::segment_manager> MapAllocator; typedef map<int, int, std::less&lt;int>, MapAllocator> IntegerMap; const char* segName = "MAPSEGMENT"; const char* mapName = "MAPNAME"; int main() { shared_memory_object::remove(segName); managed_shared_memory segment(create_only, segName, 1000); MapAllocator allocator(segment.get_segment_manager()); IntegerMap* pOffsetMap = segment.construct<IntegerMap>(mapName)(std::less<int>(), allocator ); int key = 1; int ivalue = 10; MapValue value(key, ivalue); pOffsetMap->insert(value); return 0; } //SHMReader ----------------------------- typedef std::pair<int, int> MapValue; typedef allocator<MapValue, managed_shared_memory::segment_manager> MapAllocator; typedef map<int, int, std::less&lt;int>, MapAllocator> IntegerMap; const char* segName = "MAPSEGMENT"; const char* mapName = "MAPNAME"; int main() { try { managed_shared_memory segment(open_only, "MAPSEGMENT"); IntegerMap* pMap = segment.find_no_lock<IntegerMap>(mapName).first; int key = 1; int value = pMap->at(key); std::cout << value << std::endl; } catch(interprocess_exception& ie) { std::cout << ie.what() << std::endl; } catch(std::exception& stde) { std::cout << stde.what() << std::endl; } return 0; } -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-interprocess-Segmentation-fault-tp… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[Range] Confusing result of iterator_range::size()
by Sergey Voropaev 08 Nov '11

08 Nov '11

Hi, I try use boost::iterator_range as replacement for some standard container in my code. The function iterator_range::size() has non standart declaration: difference_type size() const; but not: size_type size() const When I compile code in VC++ 2010 I have a some warning and error. For example: #include <boost/range.hpp> #include <vector> #include <algorithm> int main() { int aaa[10] ={1,2,3,4,5,6,7,8,9,10}; std::vector<int> bbb(20); boost::iterator_range<int*> arr(aaa); if(bbb.size() > arr.size()) //warning C4018: '>' : signed/unsigned mismatch { } const size_t lng = std::min(bbb.size(), arr.size()); //error C2780: 'const _Ty &std::min(const _Ty &,const _Ty &,_Pr)' : expects 3 arguments - 2 provided //error C2782: 'const _Ty &std::min(const _Ty &,const _Ty &)' : template parameter '_Ty' is ambiguous // const size_t lng = std::min(bbb.size(), (size_t)arr.size()); //OK for(size_t i = 0; i < lng; ++i) { bbb[i] = arr[i]; } return 0; } I think declaration of boost::iterator_range must be fixed. Or there was some reason for this non standard declaration?

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Boost.Build is broken?
by Gennadiy Rozental 08 Nov '11

08 Nov '11

Hi, Frankly I do not know who supports Boost.Build, but how long it'll stay broken? I can't say when it started, but ever since I started working on Boost.Test changes I experience constant problems. I can't believe I am the only one. 1. When you take boost trunk and go into Boost.Test build or test directory and try building using any toolset it immediately fails with: ..\..\..\libs\test\build\Jamfile.v2:110: in modules.load rule boost-install unknown in module Jamfile</.../trunk/libs/test/build>. .../trunk/tools/build/v2/build\project.jam:314: in load-jamfile .../trunk/tools/build/v2/build\project.jam:62: in project.load .../trunk/tools/build/v2/build\project.jam:766: in project.use .../trunk/tools/build/v2/build\project.jam:89: in load-used-projects .../trunk/tools/build/v2/build\project.jam:73: in load .../trunk/tools/build/v2/build\project.jam:115: in load-parent .../trunk/tools/build/v2/build\project.jam:464: in initialize .../trunk/tools/build/v2/build\project.jam:309: in load-jamfile .../trunk/tools/build/v2/build\project.jam:62: in load .../trunk/tools/build/v2/build\project.jam:115: in load-parent .../trunk/tools/build/v2/build\project.jam:464: in initialize .../trunk/tools/build/v2/build\project.jam:309: in load-jamfile .../trunk/tools/build/v2/build\project.jam:62: in load .../trunk/tools/build/v2/build\project.jam:168: in project.find .../trunk/tools/build/v2\build-system.jam:570: in load .../trunk\tools\build\v2/kernel\modules.jam:283: in import .../trunk\tools\build\v2\kernel\bootstrap.jam:142: in boost-build .../trunk\boost-build.jam:17: in module scope 2. Once I remove boost-install from Boost.Test Jamfile, I get bun of errors like this: ..\..\..\libs\test\src\compiler_log_formatter.cpp(16) : fatal error C1083: Cannot open include file: 'boost/test/impl/compiler_log_formatter.ipp': No such file or directory Essentially boost home directory is missing from include path. How come? 3. Once I add "<include>../../.." into requirements section I can build with msvc toolsets. Now I am trying to use gcc toolset on Windows. I have latest cygwin installation and I am getting these errors (lots of them): gcc.compile.c++ ..\..\..\libs\test\build\bin\gcc\debug\link-static\compiler_log_formatter.o "g++" ... # compilation line here Access is denied. Apparently g++ is not an executable anymore with cygwin. I am able to workaround this by adding using gcc : 4.5.3 : g++-4.exe ; into user-config.jam, but why Boost.Build can't figure this out and do I need to support this file now myself? 4. After the fix I am able to build dll based tests, but when I attempt to use static library version of Boost.Test I am getting: gcc.archive ..\..\..\libs\test\build\bin\gcc-4.5.3\ debug\link-static\libboost_unit_test_framework.a "/usr/i686-pc-cygwin/bin/ar.exe" rc .... # list of object files here "/usr/i686-pc-cygwin/bin/ranlib.exe" ... # lib here The system cannot find the path specified. The system cannot find the path specified. This one I do not know how to fix. So the situation is that I cannot test any static library based unit tests (as a side note, this inability was the cause of crashes which interrupted trunk testing month ago). I addition whenever I want to check in my local changes to Jamfile (excluding hacks which I actually do not want to check in) it is rather annoying process. Any help would be appreciated, Gennadiy

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[atomic] review results
by Tim Blechmann 07 Nov '11

07 Nov '11

hi all, unfortunately only few reviews of boost.atomic arrived in time, however i count 3 YES and no NO, so i am happy to say: Helge Bahmann's boost.atomic library is ACCEPTED. since the library is an implementation of a c++11 feature for c++03, design, API and semantics are mostly fixed. many comments are going into details of the implementation, so i won't sum them all up ... iac, helge already said he wants to address the raised issues, the main points are summarized below. full implementation of the c++11 interface: the library currently only implements a subset of the c++11 library. it lacks the functional interface for integral atomic types and the ATOMIC_VAR_INIT / ATOMIC_FLAG_INIT macro. quickly consulting the latest draft that i currently have at hand the following two functions are missing as well: template <class T> T kill_dependency(T y); void atomic_signal_fence(memory_order); i encourage helge to provide a full implementation of the interface. documentation: the documentation is currently lacking a good API reference. i would therefore encourage helge to provide a doxygen-generated reference section. there were some concerns that it assumes that readers will have to be familiar with concurrency. maybe it is a good idea to point to some literature/tutorials about concurrent programming and/or to c++11 atomics. the section of real-world examples could probably include a link to shavit/herlihy's book `the art of multiprocessor programming'. it would also be helpful to have a detailed specification, if a platform/compiler combination supports a specific type natively (with run-time dispatching or specific compiler flags) ... maybe in form of a table. shared memory support/multi-module support: in multi-module applications and when using shared memory, the blocking emulation of atomics can cause troubles. for multi-module applications this can be resolved by placing the spinlock pool inside a shared library. shared- memory support could be realized by associating a (spin)lock with each blocking atomic<> instead of using a pool of spinlocks. boost should definitely provide atomics which support shared memory, either by default or by an additional implementation which is placed in the boost::interprocess namespace. i would like to thank helge for implementing boost.atomic and submitting it to boost and everyone who participated in the review. cheers, tim review manager

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