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Boost interprocess named mutexes
by Mike Spertus 16 Aug '09

16 Aug '09

I am seeing the following problems with Boost interprocess named mutexes on Windows. 1. As mentioned in my other threads, interprocess mutexes do not provide mutual exclusion between processes run by different users. The reason for this is the shared memory mappings backing the mutexes are placed in different directories. 2. If a process crashes while holding a mutex, no other process can subsequently acquire the mutex. 3. Although the documentation says that mutexes have process persistence, they appear to have filesystem persistence. This means that is a process or system crashes while the mutex is held, the mutex is permanently unavailable (without deleting it). Are these accurate statements? If so, could these be addressed by having Boost::interprocess use Win32 named mutexes (which I understand to have none of these defects) like it uses pthread mutexes on Linux? Thanks, Mike

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[Fusion] transform with more than 2 parameters, at_c on arithmetic types
by joel 16 Aug '09

16 Aug '09

I need to make a function that takes a N-ary function object F and N+1 fusion sequence R, S0, .., Sn-1 and do, for each element of those sequences : at_c<i>(R) = F( at_c<i>(S0), .., at_c<i>(Sn-1) ); I tried to use combo fo zip+transform but I failed miserabily. So is there anyway to do this beside writing a map function by hand using Boost.PP ? More over, I want my map function to have some of its argumetns being arithmetic types. However fusion::at_c<N>(T) with T arithmetic fails cause T is tagged as non_fusion_tag. Is it possible, without ill effects to add the support for non-fusion type for at as in : namespace boost { namespace fusion { namespace extension { template<> struct at_impl<non_fusion_tag> { template<class T,class N> struct apply { typedef typename mpl::if_c< is_const<T>::value, T const&, T& >::type type; static type call(T& seq) { return seq; } }; }; } } } Or is it better for me to do my own at that tag-dispatch between fusion type and non-fusion type ? -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35

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property_tree CDATA
by Gordon Smith 15 Aug '09

15 Aug '09

property_tree is working well except that CDATA text is missing. The underlying XML library (rapidxml) contains CDATA after reading but it is not transferred to the property_tree structure. Is there a setting I've missed to include CDATA? If not, I've modified the rapidxml reader to transfer CDATA nodes so I already have a workaround. Is this an area that is being worked on, or is CDATA excluded for a reason?

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iterators and value_type in multi_array
by HweeKuan Lee 15 Aug '09

15 Aug '09

i'm new to boost, but use the standard template library a lot. I have problems with the following code. line 12: according to the reference, i should be able to do this, but cannot compile. compile error is very long, tell me if I should include them here. my compiler: gcc version 4.0.1 (Apple Inc. build 5490) thanks in advance for your help. 1 #include <boost/multi_array.hpp> 2 3 int main ( ) { 4 5 typedef boost::multi_array<double,2> matrix_type; 6 typedef matrix_type::iterator iterator; 7 8 matrix_type mat(boost::extents[2][3]); 9 double v = .2; 10 11 for(iterator it=mat.begin();it!=mat.end();++it) { 12 (*it) = v; // compile error 13 } 14 }

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Installed boost::regex, and it compiles, but can't get it to link
by Jerry Davis 15 Aug '09

15 Aug '09

I am running ubuntu 9.04 I have built the libs from 1.39.0 with gcc 4.3 and moved them to /usr/local/boost I have done a $ sudo ldconfig -v and have seen the boost libaries are installed here is the code, taken from the boost web site: #include <boost/regex.hpp> #include <iostream> #include <string> using namespace std; int main() { string line; boost::regex pat( "^Subject: (Re: |Aw: )*(.*)" ); while (cin) { getline(cin, line); boost::smatch matches; if (boost::regex_match(line, matches, pat)) cout << matches[2] << endl; } } I can compile ok: g++ -I /usr/local/boost/include/boost-1_39 -c regex_example.cpp But when I try to link I get a ton of errors, can anyone tell me what I need to do next? -- Jerry $ g++ -I /usr/local/boost/include/boost-1_39 -L /usr/local/boost/lib regex_example.cpp /tmp/ccBBRJVR.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)': regex_example.cpp:(.text._ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)]+0x22): undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)' /tmp/ccBBRJVR.o: In function `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(__gnu_cxx::__normal_iterator<char const*, >std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, >__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, >std::char_traits<char>, std::allocator<char> > >, >boost::match_results<__gnu_cxx::__normal_iterator<char const*, >std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, >std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, >std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >>&, boost::basic_regex<char, boost::regex_traits<char, >>boost::cpp_regex_traits<char> > > const&, >>boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char >>const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> >>> >)': >>> >regex_example.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC1ES6_S6_RNS_13match_resultsIS6_S9_EERKNS_11basic_regexIcSD_EENS_15regex_constants12_match_flagsES6_[boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char >>> >const*, std::basic_string<char, std::char_traits<char>, >>> >std::allocator<char> > >, >>> >std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, >>> >std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >>> >>, boost::regex_traits<char, boost::cpp_regex_traits<char> > >>> >>>::perl_matcher(__gnu_cxx::__normal_iterator<char const*, >>> >>>std::basic_string<char, std::char_traits<char>, std::allocator<char> > >>> >>>>, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, >>> >>>>std::char_traits<char>, std::allocator<char> > >, >>> >>>>boost::match_results<__gnu_cxx::__normal_iterator<char const*, >>> >>>>std::basic_string<char, std::char_traits<char>, std::allocator<char> > >>> >>>>>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>std::allocator<char> > > > > >&, boost::basic_regex<char, >>> >>>>>boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, >>> >>>>>boost::regex_constants::_match_flags, >>> >>>>>__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, >>> >>>>>std::char_traits<char>, std::allocator<char> > >)]+0xc2): undefined >>> >>>>>reference to >>> >>>>>`boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char >>> >>>>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>std::allocator<char> > >, >>> >>>>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>std::allocator<char> > > > >, boost::regex_traits<char, >>> >>>>>boost::cpp_regex_traits<char> > >>> >>>>>>::construct_init(boost::basic_regex<char, boost::regex_traits<char, >>> >>>>>>boost::cpp_regex_traits<char> > > const&, >>> >>>>>>boost::regex_constants::_match_flags)' /tmp/ccBBRJVR.o: In function >>> >>>>>>`bool boost::regex_match<__gnu_cxx::__normal_iterator<char const*, >>> >>>>>>std::basic_string<char, std::char_traits<char>, std::allocator<char> >>> >>>>>>> >, >>> >>>>>>> >std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >std::allocator<char> > > > >, char, boost::regex_traits<char, >>> >>>>>>> >boost::cpp_regex_traits<char> > >>> >>>>>>> >>(__gnu_cxx::__normal_iterator<char const*, >>> >>>>>>> >>std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>std::allocator<char> > >, __gnu_cxx::__normal_iterator<char >>> >>>>>>> >>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>std::allocator<char> > >, >>> >>>>>>> >>boost::match_results<__gnu_cxx::__normal_iterator<char const*, >>> >>>>>>> >>std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>std::allocator<char> > >, >>> >>>>>>> >>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>std::allocator<char> > > > > >&, boost::basic_regex<char, >>> >>>>>>> >>boost::regex_traits<char, boost::cpp_regex_traits<char> > > >>> >>>>>>> >>const&, boost::regex_constants::_match_flags)': >>> >>>>>>> >>regex_example.cpp:(.text._ZN5boost11regex_matchIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS5_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SD_RNS_13match_resultsISD_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE[bool >>> >>>>>>> >>boost::regex_match<__gnu_cxx::__normal_iterator<char const*, >>> >>>>>>> >>std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>std::allocator<char> > >, >>> >>>>>>> >>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>std::allocator<char> > > > >, char, boost::regex_traits<char, >>> >>>>>>> >>boost::cpp_regex_traits<char> > >>> >>>>>>> >>>(__gnu_cxx::__normal_iterator<char const*, >>> >>>>>>> >>>std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > >, __gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > >, >>> >>>>>>> >>>boost::match_results<__gnu_cxx::__normal_iterator<char const*, >>> >>>>>>> >>>std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > >, >>> >>>>>>> >>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > > > > >&, boost::basic_regex<char, >>> >>>>>>> >>>boost::regex_traits<char, boost::cpp_regex_traits<char> > > >>> >>>>>>> >>>const&, boost::regex_constants::_match_flags)]+0x47): undefined >>> >>>>>>> >>>reference to >>> >>>>>>> >>>`boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > >, >>> >>>>>>> >>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > > > >, boost::regex_traits<char, >>> >>>>>>> >>>boost::cpp_regex_traits<char> > >::match()' /tmp/ccBBRJVR.o: In >>> >>>>>>> >>>function `boost::cpp_regex_traits<char>::transform(char const*, >>> >>>>>>> >>>char const*) const': >>> >>>>>>> >>>regex_example.cpp:(.text._ZNK5boost16cpp_regex_traitsIcE9transformEPKcS3_[boost::cpp_regex_traits<char>::transform(char >>> >>>>>>> >>>const*, char const*) const]+0x30): undefined reference to >>> >>>>>>> >>>`boost::re_detail::cpp_regex_traits_implementation<char>::transform(char >>> >>>>>>> >>>const*, char const*) const' /tmp/ccBBRJVR.o: In function >>> >>>>>>> >>>`boost::cpp_regex_traits<char>::transform_primary(char const*, >>> >>>>>>> >>>char const*) const': >>> >>>>>>> >>>regex_example.cpp:(.text._ZNK5boost16cpp_regex_traitsIcE17transform_primaryEPKcS3_[boost::cpp_regex_traits<char>::transform_primary(char >>> >>>>>>> >>>const*, char const*) const]+0x30): undefined reference to >>> >>>>>>> >>>`boost::re_detail::cpp_regex_traits_implementation<char>::transform_primary(char >>> >>>>>>> >>>const*, char const*) const' /tmp/ccBBRJVR.o: In function >>> >>>>>>> >>>`boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > >, >>> >>>>>>> >>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > > > >, boost::regex_traits<char, >>> >>>>>>> >>>boost::cpp_regex_traits<char> > >::match_match()': >>> >>>>>>> >>>regex_example.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE11match_matchEv[boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > >, >>> >>>>>>> >>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > > > >, boost::regex_traits<char, >>> >>>>>>> >>>boost::cpp_regex_traits<char> > >::match_match()]+0x172): >>> >>>>>>> >>>undefined reference to >>> >>>>>>> >>>`boost::match_results<__gnu_cxx::__normal_iterator<char const*, >>> >>>>>>> >>>std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > >, >>> >>>>>>> >>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>std::allocator<char> > > > > >>> >>>>>>> >>>>::maybe_assign(boost::match_results<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>>std::allocator<char> > >, >>> >>>>>>> >>>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char >>> >>>>>>> >>>>const*, std::basic_string<char, std::char_traits<char>, >>> >>>>>>> >>>>std::allocator<char> > > > > > const&)' /tmp/ccBBRJVR.o: In >>> >>>>>>> >>>>function >>> >>>>>>> >>>>`boost::re_detail::cpp_regex_traits_implementation<char>::error_string(boost::regex_constants::error_type) >>> >>>>>>> >>>>const': >>> >>>>>>> >>>>regex_example.cpp:(.text._ZNK5boost9re_detail31cpp_regex_traits_implementationIcE12error_stringENS_15regex_constants10error_typeE[boost::re_detail::cpp_regex_traits_implementation<char>::error_string(boost::regex_constants::error_type) >>> >>>>>>> >>>>const]+0x9b): undefined reference to >>> >>>>>>> >>>>`boost::re_detail::get_default_error_string(boost::regex_constants::error_type)' >>> >>>>>>> >>>>regex_example.cpp:(.text._ZNK5boost9re_detail31cpp_regex_traits_implementationIcE12error_stringENS_15regex_constants10error_typeE[boost::re_detail::cpp_regex_traits_implementation<char>::error_string(boost::regex_constants::error_type) >>> >>>>>>> >>>>const]+0x140): undefined reference to >>> >>>>>>> >>>>`boost::re_detail::get_default_error_string(boost::regex_constants::error_type)' /tmp/ccBBRJVR.o: >>> >>>>>>> >>>>In function `void >>> >>>>>>> >>>>boost::re_detail::raise_error<boost::regex_traits_wrapper<boost::regex_traits<char, >>> >>>>>>> >>>>boost::cpp_regex_traits<char> > > >>> >>>>>>> >>>>>(boost::regex_traits_wrapper<boost::regex_traits<char, >>> >>>>>>> >>>>>boost::cpp_regex_traits<char> > > const&, >>> >>>>>>> >>>>>boost::regex_constants::error_type)': regex_example.cpp:(.text._ZN5boost9re_detail11raise_errorINS_20regex_traits_wrapperINS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEEEvRKT_NS_15regex_constants10error_typeE[void boost::re_detail::raise_error<boost::regex_traits_wrapper<boost::regex_traits<char, boost::cpp_regex_traits<char> > > >(boost::regex_traits_wrapper<boost::regex_traits<char, >boost::cpp_regex_traits<char> > > const&, >boost::regex_constants::error_type)]+0x72): undefined reference to >`boost::re_detail::raise_runtime_error(std::runtime_error >const&)' /tmp/ccBBRJVR.o: In function >`boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, >std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, >std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, >std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, >boost::regex_traits<char, boost::cpp_regex_traits<char> > >::extend_stack()': >regex_example.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE12extend_stackEv[boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char >const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, >>std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, >>boost::regex_traits<char, boost::cpp_regex_traits<char> > >>>::extend_stack()]+0x20): undefined reference to >>>`boost::re_detail::get_mem_block()' /tmp/ccBBRJVR.o: In function >>>`boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, >>>std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, >>>std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, >>>std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >>>>, boost::regex_traits<char, boost::cpp_regex_traits<char> > >>>>>::unwind_extra_block(bool)': regex_example.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE18unwind_extra_blockEb[boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, >std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, >boost::regex_traits<char, boost::cpp_regex_traits<char> > >>::unwind_extra_block(bool)]+0x48): undefined reference to >>`boost::re_detail::put_mem_block(void*)' collect2: ld returned 1 exit status -- Hobbit Name: Pimpernel Loamsdown Registered Linux User: 275424 K7AZJ This email's Fortune: Yow! I want my nose in lights!

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Re: [Boost-users] how to know my own IP address
by dhruva 15 Aug '09

15 Aug '09

Hello, > >> I'm using the boost library to create and manage a UDP socket. I > >> was wondering if there is a way to know the public address of my > >> machine using the boost classes. With this code > >> > >> udp::endpoint thisendpoint(udp::v4(), UDPPORT); > >> boost::asio::ip::address myaddress = thisendpoint.address(); > >> std::cout<< "__My IP address: " << myaddress.to_string() << > >> std::endl; > >> > >> I can only print the any_address (0.0.0.0)... thanks, > >> > >> p_viotti _______________________________________________ > > Tommy> You can always adress your own machine via the special > Tommy> ip adress 127.0.0.1 (or the special domain localhost) I have worked on this topic quite extensively. We had a requirement to find the global IP address of the local machine to be able to send ICMP6 packets. The packets needs to be signed by the senders IP address else machines on a network need not respond. The problem is a machine can have multiple NICs. So, you need a mechanism to iterate all available NICs and get the associated IP addresses. In this problem domain, MS Windows wins as they have nice APIs (GetAdaptersAddresses) to do that. Coming to GNU/Linux land, you need to parse the '/proc/net/if_inet6'. So, I ended up writing code that works on windows and gnu/linux. In short, there is no easy way to do it. Using name resolution is not an option as some machines might not have a DNS entry. It is not foolproof. -dhruva See the Web's breaking stories, chosen by people like you. Check out Yahoo! Buzz. http://in.buzz.yahoo.com/

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Re: [Boost-users] randomize_property question
by mcorbion＠mobigis.fr 14 Aug '09

14 Aug '09

On Fri, 14 Aug 2009, mcorbion_at_[hidden] wrote: > Ok so I still can't use the randomize property but I've done a workaround. > I created an AbstractGraph class which has a m_Graph adjacency_list type > of graph. And nodes uses the bundled property : > struct City > { > int pos_X; > int pos_Y; > }; > > > My workaround test function uses the property map given to randomly set > the values, but it's still too specific : > > template <typename Graph, typename BundProp,typename RandomGenerator> > void AbstractGraph::test(bundle_property_map<Graph,unsigned > int,BundProp,int> p_PMap, RandomGenerator& p_ewrg){ > > AbstractGraph::N_iterator l_NodeStart; > AbstractGraph::N_iterator l_NodeEnd; > AbstractGraph::GetNodes(l_NodeStart,l_NodeEnd); > > for (; l_NodeStart != l_NodeEnd; ++l_NodeStart) { > p_PMap[*l_NodeStart] = p_ewrg(); > } > } > > called this way in the main : > > mt19937 l_Gen(1988); > boost::uniform_int<> RandRange(1,10); > boost::variate_generator<boost::mt19937&, boost::uniform_int<> > > ew2rg(l_Gen, RandRange); > > > typedef property_map<Graph, int(City::*)>::type t_PMapCity; > t_PMapCity l_PMap=get(&City::pos_X,m_Graph); > test<Graph,City>(l_PMap,ew2rg); > > > I would like to include the two line that generates the property_map from > the main to the test function. I've tried this : > > template <typename Graph, typename PropertyTagType,typename RandomGenerator> > void AbstractGraph::test2( ??? p_PropertyTagName,RandomGenerator& p_ewrg){ > > typedef property_map<Graph, PropertyTagType>::type t_PMap; > t_PMap l_PMap=get(PropertyTagName,m_Graph); > AbstractGraph::N_iterator l_NodeStart; > AbstractGraph::N_iterator l_NodeEnd; > AbstractGraph::GetNodes(l_NodeStart,l_NodeEnd); > > for (; l_NodeStart != l_NodeEnd; ++l_NodeStart) { > p_PMap[*l_NodeStart] = p_ewrg(); > } > } > > called this way : > > test2<Graph,int(City::*)>(l_Gen, &City::pos_X); > > But I can't figure any type for &City::pos_X in order to write the header > for test2 allowing the function to work with float, char ... The type of &City::pos_X should be "int City::*" (without the extra parentheses); however, argument deduction should pick that up for you automatically, both for this code and randomize_property. The ??? in test2 should be PropertyTagType, I believe. -- Jeremiah Willcock Thanks a lot for the help. I've changed test2 and it works! Here's the code for those who encounters the same problem : template <typename Graph, typename PropertyTagType,typename RandomGenerator> void AbstractGraph::test2( PropertyTagType p_PropertyTagName,RandomGenerator& p_ewrg){ typedef property_map<Graph, PropertyTagType>::type t_PMap; t_PMap l_PMap=get(p_PropertyTagName,m_Graph); AbstractGraph::N_iterator l_NodeStart; AbstractGraph::N_iterator l_NodeEnd; AbstractGraph::GetNodes(l_NodeStart,l_NodeEnd); for (; l_NodeStart != l_NodeEnd; ++l_NodeStart) { l_PMap[*l_NodeStart] = p_ewrg(); } } and how to call it : test2<Graph>(&City::pos_X,ew2rg); //or test2<Graph,int City::*>(l_Gen,&City::pos_X); As you said deduction picked up for me the typename for PropertyTagType but putting directly the type "int City::*" doesn't work for the template in randomize_property (whereas it works with my function test 2). randomize_property<int City::*>(m_Graph,ew2rg); It gives me this compiling error : \boost\pending\property.hpp(47) : error C2825: 'PropertyTag' : doit être une classe ou un espace de noms lorsqu'il est suivi par '::' \boost\graph\random.hpp(196) : voir la référence à l'instanciation de la classe modèle 'boost::property_kind<PropertyTag>' en cours de compilation which translates to : \boost\pending\property.hpp(47) : error C2825: PropertyTag must be a class or a namespace when followed by '::' \boost\graph\random.hpp(196) : see the reference at instanciation of the model class 'boost::property_kind<PropertyTag>' In randomize_property there are no input of the Class Property : template<class Property, class G, class RandomGenerator> void randomize_property(G& g, RandomGenerator& rg) It only tries to get the property_kind from it : typename property_kind<Property>::type() In order to invoke the more detailed function. And even when I will have the errorC2825 fixed, I think that my City structure having no "kind" element, it won't be able to pick the right detailed function. I checked property_kind and it redefines "kind" into "type" : template <class PropertyTag> struct property_kind { typedef typename PropertyTag::kind type; }; To sum it up I now have three questions ^^: 1 How can I solve the errorC2825? because the template instanciation works fine with my test2 function and not with the randomize_property 2 Will the property_kind structure work with a bundled property? And if not here's the question 3... 3 Is there a way to get to know from a bundled property if it's an edge_property_tag or a vertex_property_tag? This way I could directly use detail::randomize_property and give it myself. P.S for number 3 : I thought about adding "kind" in my Struct City from the type : boost::vertex_property_tag. So I could use it in my detailed randomize_property call, but if there is another way I would be happy to know it. Thanks in advance M.Corbion

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[boost][accumulators]: runtime accumulator_set construction?
by Stephen Nuchia 14 Aug '09

14 Aug '09

Forgive me, my brain still thinks in C... or C++'86 on a good day. Looking at the documentation for Accumulators, and given what I think I understand about C++ metaprogramming, it looks as though the dependency resolution mechanisms in the accumulator framework operate only at compile time. Is this right? Is runtime specification of a set of features possible? Thank you, -swn

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Re: [Boost-users] randomize_property question
by mcorbion＠mobigis.fr 14 Aug '09

14 Aug '09

Ok so I still can't use the randomize property but I've done a workaround. I created an AbstractGraph class which has a m_Graph adjacency_list type of graph. And nodes uses the bundled property : struct City { int pos_X; int pos_Y; }; My workaround test function uses the property map given to randomly set the values, but it's still too specific : template <typename Graph, typename BundProp,typename RandomGenerator> void AbstractGraph::test(bundle_property_map<Graph,unsigned int,BundProp,int> p_PMap, RandomGenerator& p_ewrg){ AbstractGraph::N_iterator l_NodeStart; AbstractGraph::N_iterator l_NodeEnd; AbstractGraph::GetNodes(l_NodeStart,l_NodeEnd); for (; l_NodeStart != l_NodeEnd; ++l_NodeStart) { p_PMap[*l_NodeStart] = p_ewrg(); } } called this way in the main : mt19937 l_Gen(1988); boost::uniform_int<> RandRange(1,10); boost::variate_generator<boost::mt19937&, boost::uniform_int<> > ew2rg(l_Gen, RandRange); typedef property_map<Graph, int(City::*)>::type t_PMapCity; t_PMapCity l_PMap=get(&City::pos_X,m_Graph); test<Graph,City>(l_PMap,ew2rg); I would like to include the two line that generates the property_map from the main to the test function. I've tried this : template <typename Graph, typename PropertyTagType,typename RandomGenerator> void AbstractGraph::test2( ??? p_PropertyTagName,RandomGenerator& p_ewrg){ typedef property_map<Graph, PropertyTagType>::type t_PMap; t_PMap l_PMap=get(PropertyTagName,m_Graph); AbstractGraph::N_iterator l_NodeStart; AbstractGraph::N_iterator l_NodeEnd; AbstractGraph::GetNodes(l_NodeStart,l_NodeEnd); for (; l_NodeStart != l_NodeEnd; ++l_NodeStart) { p_PMap[*l_NodeStart] = p_ewrg(); } } called this way : test2<Graph,int(City::*)>(l_Gen, &City::pos_X); But I can't figure any type for &City::pos_X in order to write the header for test2 allowing the function to work with float, char ... Thanks in advance M.CORBION

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Re: [Boost-users] [interprocess]files locations for mutex and named shm
by Mike Spertus 14 Aug '09

14 Aug '09

Ion Gazta?aga wrote > Mike Spertus escribi?: > >> > I'm being bitten by the surprise discovery that different Windows users >> > can't(?) communicate via named shared memory using Boost Interprocess as >> > in the post below from 2008-09-18 (Changing all processes to use the >> > same TMP directory is not an option for us due to interoperability >> > requirements). Is there a workaround? Was anything ever done about the >> > proposed solution below? Another alternative would be to make it >> > possible to specify the "Boost Interprocess temp directory". >> > > For boost 1.40 I've changed the TMP directory for the Common Documents > directory, searching that folder using the registry. In theory, that > folder is accessible by all processes and should be present in all > systems. Nevertheless, I'll add the option to specify the temp directory > to my to-do list, maybe using an environment variable? > > Best, > > Ion > > Hi Ion, Thanks for the response. boost 1.40 will be a big help. Among other things, I have found that this results in a much more serious problem, which is that boost interprocess named mutexes do not provide mutual exclusion because the service and application will use different directories to hold the shared memory mappings that back the mutex. As far as specifying the temp directory, providing an API instead of an envar would prevent conflict with other apps using boost::interprocess if we distribute our application and have to set a global envar in our installer. Thanks again, Mike

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