August 2007 - Boost-users - lists.preview.boost.org

[serialization, ASIO] Assertion when serializing recursive boost::variant type
by Falco Hirschenberger 05 Sep '07

05 Sep '07

Hi, I have defined a recursive variant type like this: --- typedef boost::make_recursive_variant<bool, int, double, std::string, std::vector< boost::recursive_variant_ >, std::map<std::string, boost::recursive_variant_>, TGrey8Image, TRgbImage, TRgbaImage>::type TVType; --- and two containers which can store this type: --- typedef std::vector<TVType> TVector; typedef std::map<std::string, TVType> TMap; --- I wrote a set of unit-tests testing all types of plain and recursive containers and they work as expected. I also tested (de-)serialization to a binary archive and there's also no problem. Then I implemented a Message class which contains such a TVType + some other stuff. Serializing and deserializing also works in the tests. Finally I implemented a client and server with ASIO like the ASIO "serialization" example. First sending the size of the archive and then the data itself. The sending works but when I want to deserialize my message I get the following assertion: --- testSerialization: /usr/include/boost/variant/detail/visitation_impl.hpp:203: typename Visitor::result_type boost::detail::variant::visitation_impl(int, int, Visitor&, VPCV, mpl_::true_, NBF, W*, S*) [with W = mpl_::int_<20>, S = boost::detail::variant::visitation_impl_step<boost::mpl::l_iter<boost::mpl::l_end>, boost::mpl::l_iter<boost::mpl::l_end> >, Visitor = boost::detail::variant::invoke_visitor<boost::detail::variant::direct_assigner<const int> >, VPCV = void*, NBF = boost::variant<boost::detail::variant::recursive_flag<bool>, int, double, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<boost::recursive_variant_, std::allocator<boost::recursive_variant_> >, std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::recursive_variant_, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::recursive_variant_> > >, CIS::Image2d<unsigned char>, CIS::Image2d<CIS::RGB>, CIS::Image2d<CIS::RGBA>, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>::has_fallback_type_]: Assertion `false' failed. --- I absolutely don't know what't wrong here the backtrace iss huge but the point in my code where it happens is the line when deserializing the message. When I comment out the TVType payload of the message, it works. I would really appreciate any clue. Greetings, Falco

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Boost.Test claims Qt leaks memory
by Steve M. Robbins 05 Sep '07

05 Sep '07

Hi, I'd appreciate some advice using the Boost unit testing library with Qt classes. I'm using MSVC 8.0 on windows XP. It appears that simply creating and destroying a QObject allocates some static datastructures which are reported as a memory leak by Boost.Test. I'd like to somehow suppress this "static leak" so that Boost.Test may find real leaks in my code. Consider the following test program #define BOOST_AUTO_TEST_MAIN #include <boost/test/auto_unit_test.hpp> #include <Qt/qobject.h> BOOST_AUTO_TEST_CASE( example ) { BOOST_CHECK_EQUAL( 1, 1 ); QObject obj; } It builds and runs fine, except that memory leaks are detected. My first line of attack is to clean up after Qt somehow. (c.f. http://lists.trolltech.com/qt-interest/2007-08/thread00997-0.html) But failing that, is there some way to have Boost.Test ignore these static allocations? I tried turning off leak detection, allocating and deleting a QObject, then turning leak detection back on. But the leaks are still reported. Any ideas? Thanks, -Steve

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using shared_array in Nd array
by Jeffrey Jiang 04 Sep '07

04 Sep '07

Hi, I am new to boost, and is trying to implement shared_ptr solution to a 2d array of pointers. Eg Character *** characters; characters = new Character**[_info._l ]; for (int i=0; i< _info._l; i++){ characters[i] = new Character* [_info._w]; for( int j=0;j < _info._w; j++){ characters[i][j] = 0; } } This is a sparse array, most of the pointers will be set to 0. As I could not find much information about shared_array on line, I would like to check is there any issue with this implementation. boost::shared_array<boost::shared_array<boost::shared_ptr<Character>>> characterGrid(new boost::shared_array<boost::shared_ptr<Character>>[_info._l ]); for( int i=0;i< _info._l; i++) { characterGrid[i] = boost::shared_array<boost::shared_ptr<Character>>(new boost::shared_ptr<Character>[_info._w]); for( int j=0; j< _info._w; j++) { //is it alright for me to use an empty shared_ptr in this context to init the array? characterGrid[i][j] = boost::shared_ptr<Character>(); } } Thanks. Jeffrey.

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Using stringtok with multiarray
by Abhishek V 04 Sep '07

04 Sep '07

Hi My overall goal is to read a csv file and then create a graph out of this. Which can be provided as an input to the boost graph library.For creating vertex set i have used vector and for edges i m making use of multiarray. The sample code snippet is provided below.. (This is not the actual code) /* vector<string> vect; string str="L1,L2,L3,L4,L5"; string str1="L1,0,0,0,0"; string str2="L2,0,0,0,0"; boost::stringtok(vect,str,","); typedef boost::multi_array<string,2> my_array; typedef my_array::index index; int size =vect.size(); my_array A1(boost::extents[size][size]); int i=0; for(index jt=0;jt!=size;jt++) { boost::stringtok(A1[0][jt],str1,","); } The one in Bold gives an error message.. c:\srlgrp\boostlib\boost_1_34_0\boost_1_34_0\boost\pending\stringtok.hpp(103) : error C2039: 'push_back' : is not a member of 'multi_array<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,2,class std::allocator <class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >' Please help regarding this. Also let me know if this is the best way to perform the task or something else will be better... Abhishek Vyas Tata Consultancy Services Mailto: abhishek.v(a)tcs.com Website: http://www.tcs.com ____________________________________________ Experience certainty. IT Services Business Solutions Outsourcing ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

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[regex] Why pattern anchored at buffer end ($) also match for (\x0c)FF, (\x0d)CR
by Chandan Nilange 03 Sep '07

03 Sep '07

Hello, As per PCRE /m modifier $ will match the pattern before any newline. However boost_regex gives back matches before formfeed(\x0c) & CarriagReturn(\x0d) Same is observed for ^ i.e match after newline. Please could anybody let me know what is the right pcre behaviour? I have attached the example for demonstration of the case, using boost_regex Regards, Chandan --------------------------------- Park yourself in front of a world of choices in alternative vehicles. Visit the Yahoo! Auto Green Center. #include <iostream> #include <string> #include "/home/ChandanNilange/work/boost/boost_1_34_0/boost/regex.hpp" // Boost.Regex lib using namespace std; int main( ) { std::string s,sre; //regular expression sre="\x30$"; //Matching string s="\x01\x30\x02\x31\x03\x32\x04\x33\x05\x34\x06\x35\x07\x36\x08\x37\x09\x30\x0a\x39\x0b\x30\x0c\x30\x0d\x3c\x0e\x3d\x0f"; boost::regex re; re.assign(sre, boost::regex_constants::perl); std::string::const_iterator start, end; start = s.begin(); end = s.end(); boost::sregex_iterator it(start, end, re); boost::sregex_iterator it_end; for( ; it != it_end; it++) { cout << "Found Pattern:start:" << std::string((*it)[0].first, (*it)[0].second) << ":end:\n" << "Pattern starts at :" << (*it)[0].first - s.begin() << "\nPattern ends at: " << ((*it)[0].second - 1) - s.begin() << "\nPattern length:" << (*it)[0].length() << endl; } } /************************** Results: Found Pattern:start:0:end: Pattern starts at :17 Pattern ends at: 17 Pattern length:1 Found Pattern:start:0:end: Pattern starts at :21 Pattern ends at: 21 Pattern length:1 Found Pattern:start:0:end: Pattern starts at :23 Pattern ends at: 23 Pattern length:1 ****************************/

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[Filesystem] Native Pathname Format
by Edward Diener 03 Sep '07

03 Sep '07

I can not determine from the Filesystem documentation, nor the reference documentation which comes with it, what is the acceptable syntax for the native pathname format. It appears one must start the native pathname format with //: in order for it to be recognized, but I can not tell from what appears to me to be very confusing documentation whether this is so for the Boost Fileystem implementation. This would mean, let's say under Windows, that "c:\afile" would not be recognized but that "//:c:\afile" would be recognized, as far as I can make out from the documentation. It sure is confusing IMO. Can anybody clarify how this works for Filesystem and/or where there is a clear explanation of how it works in the documentation ?

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[multi_array] Warnings on upgrade to 1.34.1
by Mark Ruzon 01 Sep '07

01 Sep '07

This reindex function in multi_array/view.hpp is apparently being compiled with BOOST_NO_SFINAE not being defined. template <class BaseList> #ifdef BOOST_NO_SFINAE void #else typename disable_if<typename boost::is_integral<BaseList>::type,void >::type #endif reindex(const BaseList& values) { boost::function_requires< detail::multi_array::CollectionConcept<BaseList> >(); boost::detail::multi_array:: copy_n(values.begin(),num_dimensions(),index_base_list_.begin()); origin_offset_ = this->calculate_indexing_offset(stride_list_,index_base_list_); } I am getting the following error, because naturally there is no return statement. /usr/include/c++/boost_1_34_1/boost/multi_array/view.hpp: In member function `boost::disable_if<boost::is_integral<BaseList>::type, void>::type boost::detail::multi_array::const_multi_array_view<T, NumDims, TPtr>::reindex(const BaseList&)': /usr/include/c++/boost_1_34_1/boost/multi_array/view.hpp:89: warning: no return statement in function returning non-void Is there a fix for this? Shouldn't there be another #ifdef with a return statement? How do I know if I should define BOOST_NO_SFINAE? Sincerely, Mark Ruzon

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[Graph] edge() not working
by David A. Greene 31 Aug '07

31 Aug '07

[Apologies if this has been asked before. Gmane is down and Google didn't return anything interesting.] I have a Boost (1.34.1) Graph declared like this: typedef boost::adjacency_list<boost::setS, // Out edge list type boost::listS, // Vertex list type boost::undirectedS, vertex_property_bundle // Vertex properties // Edge properties > my_graph_type; I want to find out if an edge is in the graph: typedef typename boost::graph_traits<my_graph_type>:: edge_descriptor_type edge; edge e; bool present; boost::tie(e, present) = edge(v1, v2, my_graph); Unfortunately, g++ 4.1.2 doesn't like it: error: no matching function for call to boost::detail::edge_desc_impl<boost::undirected_tag, void*>::edge_desc_impl(void* const&, void* const&, boost::adjacency_list<boost::setS, boost::listS, boost::undirectedS, vertex_property_bundle, boost::no_property, boost::no_property, boost::listS>&) boost-1_34_1/boost/graph/detail/edge.hpp:43: note: candidates are: boost::detail::edge_desc_impl<Directed, Vertex>::edge_desc_impl(Vertex, Vertex, const void*) [with Directed = boost::undirected_tag, Vertex = void*] boost-1_34_1/boost/graph/detail/edge.hpp:41: note: boost::detail::edge_desc_impl<Directed, Vertex>::edge_desc_impl() [with Directed = boost::undirected_tag, Vertex = void*] boost/graph/detail/edge.hpp:35: note: boost::detail::edge_desc_impl<boost::undirected_tag, void*>::edge_desc_impl(const boost::detail::edge_desc_impl<boost::undirected_tag, void*>&) Has anyone else run into this problem before? How does a reference to the graph get passed to edge_desc_impl's constructor? Thanks. -Dave

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Re: [Boost-users] [Graph] edge() not working
by Line B. Reinhardt 31 Aug '07

31 Aug '07

Hi I am not sure I understand your program. But I know I do the same thing to check for existence of edges however I use edge_descriptor (and I work on a directed graph) instead edge_descriptor_type: typedef typename boost::graph_traits<my_graph_type>::edge_descriptor_type edge; I did not know that there was anything called an edge_descriptor_type ?? Does this help?? g++ often give strange error messages. Best regards Line R. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of David A. Greene Sent: 31. august 2007 02:48 To: boost-users(a)lists.boost.org Subject: [Boost-users] [Graph] edge() not working [Apologies if this has been asked before. Gmane is down and Google didn't return anything interesting.] I have a Boost (1.34.1) Graph declared like this: typedef boost::adjacency_list<boost::setS, // Out edge list type boost::listS, // Vertex list type boost::undirectedS, vertex_property_bundle // Vertex properties // Edge properties > my_graph_type; I want to find out if an edge is in the graph: typedef typename boost::graph_traits<my_graph_type>:: edge_descriptor_type edge; edge e; bool present; boost::tie(e, present) = edge(v1, v2, my_graph); Unfortunately, g++ 4.1.2 doesn't like it: error: no matching function for call to boost::detail::edge_desc_impl<boost::undirected_tag, void*>::edge_desc_impl(void* const&, void* const&, boost::adjacency_list<boost::setS, boost::listS, boost::undirectedS, vertex_property_bundle, boost::no_property, boost::no_property, boost::listS>&) boost-1_34_1/boost/graph/detail/edge.hpp:43: note: candidates are: boost::detail::edge_desc_impl<Directed, Vertex>::edge_desc_impl(Vertex, Vertex, const void*) [with Directed = boost::undirected_tag, Vertex = void*] boost-1_34_1/boost/graph/detail/edge.hpp:41: note: boost::detail::edge_desc_impl<Directed, Vertex>::edge_desc_impl() [with Directed = boost::undirected_tag, Vertex = void*] boost/graph/detail/edge.hpp:35: note: boost::detail::edge_desc_impl<boost::undirected_tag, void*>::edge_desc_impl(const boost::detail::edge_desc_impl<boost::undirected_tag, void*>&) Has anyone else run into this problem before? How does a reference to the graph get passed to edge_desc_impl's constructor? Thanks. -Dave _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Locating source file for boost function
by Jaime Rios 31 Aug '07

31 Aug '07

Hello, I'm debugging a dylib built with XCode on a PowerPC G5. As I am stepping through the code, I find that I cannot view the source for the following call: boost::function0<void, std::allocator<boost::function_base> >::operator() The assembly code doesn't tell me much and I am having a hard time locating the source code for this. I thought the code was in the function_template.hpp file, but that is not working either. Thanks in advance! -Jaime

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