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a quick question regarding extending a class with boost::function
by Littlefield, Tyler 06 Apr '11

06 Apr '11

Hello all: I am working on a mud engine (essentially a game engine), and I had a quick question. I have an event class (yes, I know about boost::signal, but I don't want to go back and it doesn't support delayed events). I would like to set up my event class so that it will take a function object as it's callback, which allows someone extending the engine to add their own content to use global functions, member functions, lambdas, etc etc. Now, here is my problem, and this may be more of a c++ question than a boost question; I'm not really sure. Right now, every time an event gets called, I pass in the object that called it, as well as an EventArgs pointer. So an event callback function might look like this: void OnMouseDown(Object* obj, OnMouseDownArgs* args); Now, it might be useful to have the x and y coordenates where the OnMouseDown event was called, which means I end up doing something like: class OnMouseDownArgs:public EventArgs { public: int x, y; }; which essentially means that for every new type of event, I have to declare an EventArgs class for that. So here was my idea; I thought it would be kind of cool to do something like: Event* OnMouseDown<int, int> = new Event<int, int>(); which leads me to a question. given that template, how would I define a function object with those arguments? better yet, how would I accept an arbitrary number of arguments to the template, then take those arguments and create a boost::function object with them, as well as extend the .Call method to take the arguments I passed in? So in summary, I am trying to extend the boost::function object to accept a set of arguments passed in through a template when the Event object was created, as well as extend the Call method on the Event object to take the two ints as in the MouseDownEvent as arguments. Thanks, Ty

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Boost.Regex Build Failure with CPP Locale and No Win32 on WinXP using Visual Studio 2010 SP1
by David Hauck 06 Apr '11

06 Apr '11

Hello, I'm attempting to build Boost.Regex v1.46.1 with the following user.hpp settings: #define BOOST_REGEX_USE_CPP_LOCALE #define BOOST_REGEX_NO_W32 However, this is failing with the following commands (from the root Boost directory) on WinXP using Visual Studio 2010 SP1: bjam --clean link=shared regex bjam link=shared regex compile-c-c++ bin.v2\libs\regex\build\msvc-10.0\debug\threading-multi\usinstances.obj usinstances.cpp c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\map(38) : warning C4273: 'id' : inconsistent dll linkage c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xlocmes(58) : see previous definition of 'public: static std::locale::id std::messages<unsigned short>::id' c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xlocmes(58) : while compiling class template static data member 'std::locale::id std::messages<_Elem>::id' with [ _Elem=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/cpp_regex_traits.hpp(216) : see reference to function template instantiation 'bool std::has_facet<std::messages<_Elem>>(const std::locale &) throw()' being compiled with [ _Elem=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/cpp_regex_traits.hpp(211) : while compiling class template member function 'std::locale boost::re_detail::cpp_regex_traits_base<charT>::imbue(const std::locale &)' with [ charT=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/cpp_regex_traits.hpp(973) : see reference to function template instantiation 'boost::shared_ptr<T> boost::re_detail::create_cpp_regex_traits<charT>(const std::locale &)' being compiled with [ T=const boost::re_detail::cpp_regex_traits_implementation<unsigned short>, charT=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/cpp_regex_traits.hpp(971) : while compiling class template member function 'boost::cpp_regex_traits<charT>::locale_type boost::cpp_regex_traits<charT>::imbue(boost::cpp_regex_traits<charT>::locale_type)' with [ charT=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/regex_traits.hpp(74) : see reference to class template instantiation 'boost::cpp_regex_traits<charT>' being compiled with [ charT=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/basic_regex.hpp(312) : see reference to class template instantiation 'boost::regex_traits<charT>' being compiled with [ charT=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/instances.hpp(90) : see reference to class template instantiation 'boost::basic_regex<charT,traits>' being compiled with [ charT=unsigned short, traits=boost::regex_traits<unsigned short> ] c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\map(38) : error C2491:'std::messages<_Elem>::id' : definition of dllimport static data member not allowed with [ _Elem=unsigned short ] c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\map(38) : warning C4273: 'id' : inconsistent dll linkage c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\locale(48) : see previous definition of 'public: static std::locale::id std::collate<unsigned short>::id' c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\locale(48) : while compiling class template static data member 'std::locale::id std::collate<_Elem>::id' with [ _Elem=unsigned short ] C:\eng\natools\boost\1_46_1\boost/regex/v4/cpp_regex_traits.hpp(218) : see reference to function template instantiation 'const _Facet &std::use_facet<std::collate<_Elem>>(const std::locale &)' being compiled with [ _Facet=std::collate<unsigned short>, _Elem=unsigned short ] c:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\map(38) : error C2491:'std::collate<_Elem>::id' : definition of dllimport static data member not allowed with [ _Elem=unsigned short ] call "c:\Program Files\Microsoft Visual Studio 10.0\VC\vcvarsall.bat" x86 >nul cl /Zm800 -nologo @"bin.v2\libs\regex\build\msvc-10.0\debug\threading-multi\usinstances.obj.rsp" ...failed compile-c-c++ bin.v2\libs\regex\build\msvc-10.0\debug\threading-multi\usinstances.obj... ...skipped <pbin.v2\libs\regex\build\msvc-10.0\debug\threading-multi>boost_regex-vc100-mt-gd-1_46_1.dll for lack of <pbin.v2\libs\regex\build\msvc-10.0\debug\threading-multi>usinstances.obj... ...skipped <pbin.v2\libs\regex\build\msvc-10.0\debug\threading-multi>boost_regex -vc100-mt-gd-1_46_1.lib for lack of <pbin.v2\libs\regex\build\msvc-10.0\debug\threading-multi>usinstances.obj... ...skipped <pbin.v2\libs\regex\build\msvc-10.0\debug\threading-multi>boost_regex-vc100-mt-gd-1_46_1.pdb for lack of <pbin.v2\libs\regex\build\msvc-10.0\debug\threading-multi>usinstances.obj... ...failed updating 1 target... ...skipped 3 targets... ...updated 16 targets... Any ideas? BTW, ICU is properly identified as not being available. Also, all the previous modules are compiled successfully. Thanks, -David

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Re: [Boost-users] (no subject)
by Gabriel Marchand 06 Apr '11

06 Apr '11

I forgot to attach the code in the previous mail! Here it is. Hi Cedric and thank you for your reply. Actually I need the mutable graph type (using listS as vertex container) because I'll need to use the functions clear_vertex() and remove_vertex(). And I am facing the problem to create this index map property to the vertices to use the function connected_components(). I wrote a more consistent version of the code (test.cpp attached), following the instructions in a previous post by Aaron Windsor: http://boost.2283326.n4.nabble.com/connected-components-td2576097.html It compiles until I added the last line: "int num_clusters = connected_components(G, &component[0], vertex_index_map(index));" The compiler tells: gmarchand@bohr:~/TMP$ g++ test.cpp In file included from /usr/include/c++/4.4/backward/hash_set:60, from /usr/include/boost/graph/adjacency_list.hpp:25, from test.cpp:3: /usr/include/c++/4.4/backward/backward_warning.h:28:2: warning: #warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated. In file included from /usr/include/boost/graph/adjacency_list.hpp:42, from test.cpp:3: /usr/include/boost/property_map/property_map.hpp: In member function ‘void boost::WritablePropertyMapConcept<PMap, Key>::constraints() [with PMap = int*, Key = void*]’: /usr/include/boost/concept/detail/has_constraints.hpp:40: instantiated from ‘const bool boost::concept::not_satisfied<boost::WritablePropertyMapConcept<int*, void*> >::value’ /usr/include/boost/concept/detail/has_constraints.hpp:43: instantiated from ‘boost::concept::not_satisfied<boost::WritablePropertyMapConcept<int*, void*> >’ /usr/include/boost/mpl/if.hpp:67: instantiated from ‘boost::mpl::if_<boost::concept::not_satisfied<boost::WritablePropertyMapConcept<int*, void*> >, boost::concept::constraint<boost::WritablePropertyMapConcept<int*, void*> >, boost::concept::requirement<boost::WritablePropertyMapConcept<int*, void*> > >’ /usr/include/boost/concept/detail/general.hpp:19: instantiated from ‘boost::concept::requirement_<void (*)(boost::WritablePropertyMapConcept<int*, void*>)>’ /usr/include/boost/concept_check.hpp:43: instantiated from ‘void boost::function_requires(Model*) [with Model = boost::WritablePropertyMapConcept<int*, void*>]’ /usr/include/boost/graph/connected_components.hpp:67: instantiated from ‘typename boost::property_traits<IndexMap>::value_type boost::connected_components(const Graph&, ComponentMap, const boost::bgl_named_params<P, T, R>&, typename boost::enable_if_c<boost::is_base_and_derived::value, boost::graph::detail::no_parameter>::type) [with Graph = main()::graph_t, ComponentMap = int*, P = boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t>, T = boost::vertex_index_t, R = boost::no_property]’ test.cpp:54: instantiated from here /usr/include/boost/property_map/property_map.hpp:195: error: no matching function for call to ‘put(int*&, void*&, int&)’ In file included from test.cpp:4: /usr/include/boost/graph/connected_components.hpp: In member function ‘void boost::detail::components_recorder<ComponentsMap>::discover_vertex(Vertex, Graph&) [with Vertex = void*, Graph = const boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, ComponentsMap = int*]’: /usr/include/boost/graph/depth_first_search.hpp:103: instantiated from ‘void boost::detail::depth_first_visit_impl(const IncidenceGraph&, typename boost::graph_traits<Graph>::vertex_descriptor, DFSVisitor&, ColorMap, TerminatorFunc) [with IncidenceGraph = boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, DFSVisitor = boost::detail::components_recorder<int*>, ColorMap = boost::shared_array_property_map<boost::default_color_type, boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t> >, TerminatorFunc = boost::detail::nontruth2]’ /usr/include/boost/graph/depth_first_search.hpp:201: instantiated from ‘void boost::depth_first_search(const VertexListGraph&, DFSVisitor, ColorMap, typename boost::graph_traits<Graph>::vertex_descriptor) [with VertexListGraph = boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, DFSVisitor = boost::detail::components_recorder<int*>, ColorMap = boost::shared_array_property_map<boost::default_color_type, boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t> >]’ /usr/include/boost/graph/depth_first_search.hpp:296: instantiated from ‘void boost::depth_first_search(const VertexListGraph&, const boost::bgl_named_params<P, T, R>&) [with VertexListGraph = boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, P = boost::detail::components_recorder<int*>, T = boost::graph_visitor_t, R = boost::bgl_named_params<boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t>, boost::vertex_index_t, boost::no_property>]’ /usr/include/boost/graph/connected_components.hpp:75: instantiated from ‘typename boost::property_traits<IndexMap>::value_type boost::connected_components(const Graph&, ComponentMap, const boost::bgl_named_params<P, T, R>&, typename boost::enable_if_c<boost::is_base_and_derived::value, boost::graph::detail::no_parameter>::type) [with Graph = main()::graph_t, ComponentMap = int*, P = boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t>, T = boost::vertex_index_t, R = boost::no_property]’ test.cpp:54: instantiated from here /usr/include/boost/graph/connected_components.hpp:46: error: no matching function for call to ‘put(int*&, void*&, int&)’ /usr/include/boost/graph/connected_components.hpp: In member function ‘void boost::detail::components_recorder<ComponentsMap>::discover_vertex(Vertex, Graph&) [with Vertex = void*, Graph = boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, ComponentsMap = int*]’: /usr/include/boost/graph/depth_first_search.hpp:38: instantiated from ‘void boost::DFSVisitorConcept<Visitor, Graph>::constraints() [with Visitor = boost::detail::components_recorder<int*>, Graph = boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>]’ /usr/include/boost/concept/detail/has_constraints.hpp:40: instantiated from ‘const bool boost::concept::not_satisfied<boost::DFSVisitorConcept<boost::detail::components_recorder<int*>, boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS> > >::value’ /usr/include/boost/concept/detail/has_constraints.hpp:43: instantiated from ‘boost::concept::not_satisfied<boost::DFSVisitorConcept<boost::detail::components_recorder<int*>, boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS> > >’ /usr/include/boost/mpl/if.hpp:67: instantiated from ‘boost::mpl::if_<boost::concept::not_satisfied<boost::DFSVisitorConcept<boost::detail::components_recorder<int*>, boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS> > >, boost::concept::constraint<boost::DFSVisitorConcept<boost::detail::components_recorder<int*>, boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS> > >, boost::concept::requirement<boost::DFSVisitorConcept<boost::detail::components_recorder<int*>, boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS> > > >’ /usr/include/boost/concept/detail/general.hpp:19: instantiated from ‘boost::concept::requirement_<void (*)(boost::DFSVisitorConcept<boost::detail::components_recorder<int*>, boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS> >)>’ /usr/include/boost/concept_check.hpp:43: instantiated from ‘void boost::function_requires(Model*) [with Model = boost::DFSVisitorConcept<boost::detail::components_recorder<int*>, boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS> >]’ /usr/include/boost/graph/depth_first_search.hpp:191: instantiated from ‘void boost::depth_first_search(const VertexListGraph&, DFSVisitor, ColorMap, typename boost::graph_traits<Graph>::vertex_descriptor) [with VertexListGraph = boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, DFSVisitor = boost::detail::components_recorder<int*>, ColorMap = boost::shared_array_property_map<boost::default_color_type, boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t> >]’ /usr/include/boost/graph/depth_first_search.hpp:296: instantiated from ‘void boost::depth_first_search(const VertexListGraph&, const boost::bgl_named_params<P, T, R>&) [with VertexListGraph = boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, P = boost::detail::components_recorder<int*>, T = boost::graph_visitor_t, R = boost::bgl_named_params<boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t>, boost::vertex_index_t, boost::no_property>]’ /usr/include/boost/graph/connected_components.hpp:75: instantiated from ‘typename boost::property_traits<IndexMap>::value_type boost::connected_components(const Graph&, ComponentMap, const boost::bgl_named_params<P, T, R>&, typename boost::enable_if_c<boost::is_base_and_derived::value, boost::graph::detail::no_parameter>::type) [with Graph = main()::graph_t, ComponentMap = int*, P = boost::adj_list_vertex_property_map<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, long unsigned int, boost::no_property>, boost::no_property, boost::no_property, boost::listS>, long unsigned int, long unsigned int&, boost::vertex_index_t>, T = boost::vertex_index_t, R = boost::no_property]’ test.cpp:54: instantiated from here /usr/include/boost/graph/connected_components.hpp:46: error: no matching function for call to ‘put(int*&, void*&, int&)’ gmarchand@bohr:~/TMP$ I hope it is more clear now, Gabriel --- En date de : Mer 6.4.11, Cedric Laczny <cedric.laczny(a)gmx.de> a écrit : De: Cedric Laczny <cedric.laczny(a)gmx.de> Objet: Re: [Boost-users] (no subject) À: boost-users(a)lists.boost.org Date: Mercredi 6 avril 2011, 16h15 Hi, On Wednesday, 6. April 2011 12:55:52 Gabriel Marchand wrote: > Hi, I am new to boost and I face the same problem mentioned here with > "connected_components()" using a mutable graph (hence using a list for the > vertex container). I try the detailed solution of Aaron Windsor in the > previous post but I still get some errors at compilation. Here is my > little code: > > > > #include <boost/graph/adjacency_list.hpp> > #include <boost/graph/connected_components.hpp> > > using namespace std; > using namespace boost; > > Box& b = conf.GetBox(); > You seem to use your own classes and you do not provide the definition. Thus this is unfortunately not a minimal example. So in the future, it might facilitate help from others to you, with this in the back of your head. > > if (!ai) { > ai = new AtomList(); > *ai = conf.GetAtoms().AtomSelector(selecti, b); > } > > typedef boost::adjacency_list< > listS, > listS, > undirectedS, > property<vertex_index_t, size_t>, > no_property> > > > graph_t; > > graph_t g(ai->size()); > property_map<graph_t, vertex_index_t>::type index = get(vertex_index, > g); With listS as the vertex container, I would expect it to fail here. An adjacency_list with listS does not automatically create a vertex_index property. So you might give vecS a try. Especially, if you insert most of the vertices (if not all) at one specific moment and you are not constantly changing the number of vertices in the graph, I think it will make no big difference in performance whether you use vecS or listS. But you have the benefit of automatic vertex_index property-creation. I can however not compile your example (s. above) nor did you provide the error message you get, so I can't tell you for sure if this is the source of error. > graph_traits<graph_t>::vertex_iterator vi, vi_end; > graph_traits<graph_t>::vertices_size_type cnt = 0; > for(tie(vi,vi_end) = vertices(g); vi != vi_end; ++vi) > put(index, *vi, cnt++); > > for (unsigned int i = 0; i < ai->size(); ++i) { > Cartesian& crdi = ai->GetElement(i)->pos; > for (unsigned int j = i + 1; j < ai->size(); ++j) { > Cartesian& crdj = ai->GetElement(j)->pos; > double r = conf.GetBox().CartesianDistance(crdi, crdj); > if (r < rcut) { > add_edge(vertex(i,g), vertex(j,g), g); // Add edge to Map > if distance criteria is satisfied > > } > } > } > > vector<int> component(num_vertices(g)); > int num_clusters = connected_components(g, &component[0], > vertex_index_map(index)); > > > > > The compilation is successfull until I add the last line: > int num_clusters = connected_components(g, &component[0], > vertex_index_map(index)); This confuses me a bit, as I would expect the error in an earlier line. So you might look forward to provide your error message or a really working, minimal example. > > > Hope somebody can give a hint Hope this helps. > gabriel Best, Cedric _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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write_xml()
by Иван 06 Apr '11

06 Apr '11

Hi, I use write_xml() function and boost-1.46.0-4 on arch linux. void create() { ... out_file.save("/machines/"+name); .... void serializer::save (const std::string &filename) { boost::property_tree::xml_parser::xml_writer_settings<char> gramma(' ',8); write_xml(filename, pt, std::locale(), gramma); } This function don't chroot. readlink -f /proc/5682/cwd /home/iwan Write_xml() create the /machines/+name But it must create a path /home/iwan/machines/+name Why? It is bug? I am sorry for my bad english.

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ASIO port to MQX
by Nick Geoca 06 Apr '11

06 Apr '11

Does anybody know if this has been done or the duration it might take? Thanks Boost Community

1 0

Moderator Query (was: Boost.Regex Build Failure with CPP Locale and No Win32 on WinXP using Visual Studio 2010 SP1)
by David Hauck 06 Apr '11

06 Apr '11

Hello, I'm a new boost-users registrant and had a question regarding the list. Specifically, I sent a message yesterday morning (subject above) that appeared on gmane, but was not received via email. I've checked that I have received all other posts (i.e., gmane and my email for boost-users is consistent other than for the message I sent). Is there any explanation for this (I've verified this message wasn't received locally and marked as spam or otherwise moved by our Exchange server)? Also, I've noticed a couple different subject formats, specifically related to referencing the library name. The policy document suggests referencing libraries as (e.g.) Boost.Regex, but also as (e.g.) [regex] in the subject. It looks like the latter is preferred for subject text. Is this correct? Thanks for your help! -David

4 6

boost interprocess - managed_shared_memory - min segment size
by aidan mcgurn 06 Apr '11

06 Apr '11

Hi, i was wondering what/is there a minimum segment size that can be passed in here: managed_shared_memory(create_only, segmentName, segment size) For example i have seen when i set this to say 30 (30 bytes), i get a segmentation error, not here but on the following line where i try to create the mutex: boost::shared_mutex *mtx = segment.find_or_construct<boost::shared_mutex>("mtx")(); The point been, its not thrown an exception inside managed_shared_memory. However if i set this to 500, then i do get an exception which i catch and print: boost::interprocess_exception::library_error - error_code = 2; native error = 0 Looking at the error codes in error_code_t, 2 = "other_error, // library generated error" So this isn't even a size_error which i can catch and try to resize with? (not sure why this happens then and not for 30 - library generated error code is unclear in this case) If i set this to 700, then it all works fine. So i'm a/ wondering whats going on here b/ is there a minimum segment size? thanks. /aidan

2 1

boost::shared_ptr für symbian
by Ming Lu 06 Apr '11

06 Apr '11

Hello everybody, i used boost::shared_ptr from boost 1.40 for my symbian project. after upgrade of boost to 1.46.0 do i have a compile-error: /In file included from ..//..//dev-environment//libs//cpp//boost//1.46.0/boost/config.hpp:53, from ..//..//dev-environment//libs//cpp//boost//1.46.0/boost/smart_ptr/shared_ptr.hpp:17, from ..//..//dev-environment//libs//cpp//boost//1.46.0/boost/shared_ptr.hpp:17, from ..//..//Core-cpp//inc/CrossSection/Domain/XenoSqlMappedDomainObject.h:20, from ..\\..\\Core-cpp\\src\\CrossSection\\Domain\\Xenosqlmappeddomainobject.cpp:8: ..//..//dev-environment//libs//cpp//boost//1.46.0/boost/config/platform/symbian.hpp:91:4: //*#error "Unsuppoted Symbian SDK"*/ has boost 1.46.0 some changement to make the shared_ptr doesn't support the symbian anymore? what is the last boost version which support symbian open c/c++ SDK? thanks a lot with best regards Ming

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problem compiling filesystem1.46.1 w/ g++ 4.4.3
by Adam Crain 06 Apr '11

06 Apr '11

I just tried to migrate our project from 1.43 -> 1.46.1 but am getting a compilation error with g++ 4.4.3: gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-arm/release/link-static/threading-multi/v3/src/operations.o In file included from boost/filesystem/v3/operations.hpp:25, from libs/filesystem/v3/src/operations.cpp:52: boost/filesystem/v3/path.hpp: In function `std::basic_ostream<_CharT, _Traits>& boost::filesystem3::operator<<(std::basic_ostream<_CharT, _Traits>&, const boost::filesystem3::path&)': boost/filesystem/v3/path.hpp:583: error: parse error before `>' token The build works fine on with microsoft toolchain. Anyone seen this and have a patch? -- *Adam Crain* Chief Platform Architect, GEC Office: 919.836.9916 Cell: 919.428.1002 acrain(a)greenenergycorp.com <abender(a)greenenergycorp.com> *Green Energy Corp,* *enabling the smart grid of the future.** * *www.greenenergycorp.com* *www.totalgrid.org*

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[Asio] Socket Read/Write Thread-Safety
by Timothy Liang 06 Apr '11

06 Apr '11

Hi, I'm implementing a full-duplex protocol over TCP/IP using Boost.Asio. Multiple threads will be calling 'io_service::run_one()', so I have to serialize my completion handlers. Since I need to be reading and writing on a socket at the same time, can I use the 'boost::asio::async_read(...)' and 'boost::asio::async_write(...)' functions? The documentation states that these are implemented in terms of calls to the stream's async_read_some and async_write_some functions, and the 'basic_stream_socket' class isn't thread-safe. Thanks, Timothy

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