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Validating a URI according to RFC 3986 using boost::regex
by Jean-Sebastien Vachon 11 Apr '06

11 Apr '06

Hi All, I'm trying to use the regex library in order to validate a generic URI according to the regular expression specified in RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax. Here is the expression: ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))? As far as I know this is a POSIX compliant regex. I'm building my regex with the following flags: boost::regex::basic | boost::regex::icase Here is the complete code: bool RegExPOSIXValidator::IsValid(const std::string &oName) const { /* -------------------------------------------------------------------- */ /* Build the Regular Expression */ /* -------------------------------------------------------------------- */ boost::regex re(moRegex, boost::regex::basic | boost::regex::icase); return boost::regex_match(oName, re); } The function is returning false for the following URI: http://dimitrov@www.google.ca:88/index1.html?name=dimitrov#title Which seem valid to me. Unless there is something I don't see. I try doubling the \ in front of the ? at the end of the expression as a solution but it didn't help. Any idea?

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serialization of shared_ptrs with non-default deleter and factory construction
by Mikko Vainio 11 Apr '06

11 Apr '06

Dear Sirs, Does anyone have a working example of serialization of shared_ptrs with non-default deleter and factory construction as described in http://www.boost.org/libs/smart_ptr/sp_techniques.html#preventing_delete ? The code below (correctly) triggers error in boost/checked_delete.hpp because the destructor of class X is private. #include <iostream> #include <fstream> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/shared_ptr.hpp> class X { private: ~X(); class deleter; friend class deleter; class deleter { public: void operator()(X * p) { delete p; } }; friend class boost::serialization::access; template< typename Archive > void serialize(Archive & ar, const unsigned int version) { ar & some_data; } public: static boost::shared_ptr<X> create() { boost::shared_ptr<X> px(new X, X::deleter()); return px; } int some_data; }; inline std::ostream& operator<<( std::ostream& os, const X& x ) { return os << "x = " << x.some_data << std::endl; } using namespace std; int main ( int argc, char* argv[] ) { boost::shared_ptr<X> x = X::create(); x->some_data = 1; cout << *x; std::ofstream ofs("filename"); boost::archive::text_oarchive oa(ofs); oa & x; ofs.close(); std::ifstream ifs("filename", std::ios::binary); boost::archive::text_iarchive ia(ifs); x->some_data = 3; cout << *x; ia & x; cout << *x; } I'm using boost 1.33.1 and gcc 4.0.1 on linux. Any help on this is greatly appreciated. Thanking in advance, Mikko Vainio -- :: Mikko Vainio <mikko.vainio(a)abo.fi> tel + 358 2 215 4600 :: Structural Bioinformatics Laboratory :: Department of Biochemistry and Pharmacy :: Abo Akademi University, Tykistokatu 6A, FI-20520 Turku Finland

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[date-time] fatal error LNK1104
by chanekane 11 Apr '06

11 Apr '06

Hi, I am using boost version 1.33.1 and Microsoft Visual C++ 2005 Express Edition. I have made my own solution in VS to generate my library boost using only the classes I use in my project. Here all is fine. But when I compile my project. I have a Link error : fatal error LNK1104: cannot open file 'libboost_date_time-vc80-mt-1_33_1.lib' I have defined this in user.hpp in my own solution but Nothing changes : #define BOOST_ALL_DYN_LINK Thanks for your help.

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Changing name of function being called in a template
by James Hughes 11 Apr '06

11 Apr '06

Hello all, I have a feeling this may be off the topic of Boost, so if anyone can point me in the direction of a better place to ask please do (a templates mailing list?). However, I post it here because I think Boost::Bind does something similar internally to what I want to do, so someone may be able to advise. I have a couple of templated class which implement a simple observer pattern (yes I know Boost has signals, but it's not thread safe). It uses a virtual function to make a call in to the observer from the subject. My own observer then derive from this class and implement the notify function. However, I would like to 'template' the name of the function, so that different instances of the template can make calls to different named function. Now in Boost:bind you specify the name of the function in the class to be called, but I don't know how to implement that in my own template class. class observer<typename T> { virtual void Notify(T&); // This is the function I want to rename according to the template } so I might want, in a different instance, the Notify function to be called, Shutdown(). Following code is NOT valid C++, but gives an idea of what I am trying to implement, but don't know enough yet to do so!! class observer<typename T, typename functionname> { virtual void <functionname>(T&) } Is there a way I can use templates to do this? Boost:bind can call a particular member function passed in as part of the template defn, how do I that? I hope that is vaguely clear... James

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multitoken program_options
by Javier Gonzalez 10 Apr '06

10 Apr '06

Hi, I'm using the program_options library and wanted to have two multitoken options, but it seems the only multitoken option allowed has to be last one in the line. I want something like: ./my_program --files-a a* --files-b b* but when I declared the files-a option to be multitoken, then it treats '--files-b' like a value of the files-a option. Isn't there a way to do that? thanks Javier

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[BGL]: adjacency_list_io bug?
by Sebastian Weber 10 Apr '06

10 Apr '06

Hello everybody! I'm using adjacency_list_io to import my graphs from the disk: typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS > graph_t; graph_t wwwg; //string dataFile("www.bdat"); string dataFile("www_undirected.bdat"); cout << "importing www network from file \"" << dataFile << "\" ... "; ifstream wwwDatIn(dataFile.c_str()); wwwDatIn >> read( wwwg ); wwwDatIn.close(); This works nicely with g++ 3.3, but g++ 4.0 refuse to compile this code and chokes with an error message like /home/sebi/projects/diplom/src/boost_1_33_1/boost/graph/adjacency_list_io.hpp: In member function 'boost::GraphParser<Graph_t, VertexProperty, EdgeProperty, VertexPropertySubset, EdgePropertySubset>& boost::GraphParser<Graph_t, VertexProperty, EdgeProperty, VertexPropertySubset, EdgePropertySubset>::operator()(std::istream&) [with Graph_t = boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::no_property, boost::no_property, boost::no_property, boost::listS>, VertexProperty = boost::no_property, EdgeProperty = boost::no_property, VertexPropertySubset = boost::no_property, EdgePropertySubset = boost::no_property]': /home/sebi/projects/diplom/src/boost_1_33_1/boost/graph/adjacency_list_io.hpp:327: instantiated from 'std::istream& boost::operator>>(std::istream&, boost::GraphParser<Graph, VP, EP, VPS, EPS>) [with Graph = boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::no_property, boost::no_property, boost::no_property, boost::listS>, VP = boost::no_property, EP = boost::no_property, VPS = boost::no_property, EPS = boost::no_property]' I have no clue where this comes from, but it seems to be some incompatibility between g++ 4.0 and adjacency_list_io. Would be nice if someone could enlighten me or fix it. Thanks! Sebastian My system: Ubuntu 5.10, Boost 1.33.1, anything else needed?

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Regex Submatch Position Question
by admin＠geocodenet.com 10 Apr '06

10 Apr '06

Hi all, Quick question about the Boost::Regex library. Is there a way to identify, with sub-matches, where a match in the search string is made and the length of the match? For instance, with the following regular expression and search string: Regex ==> "(\d+)" Search String ==> "Give me 100 dollars or give me 2001 dollars." Is there a way to determine that the subexpression matched at positions 8 and 31 in the search string, and that the lengths of the matches were three and four characters? Thanks

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[boost][bgl] kevin-bacon.cpp example
by Harsh Deshmane 10 Apr '06

10 Apr '06

Hello Doug, I am trying to create a custom visitor class, for bfs, which accumulates all predecessors (based on Doug Gregor's suggestion for finding all paths between 2 vertices) I compiled and ran this example from the examples dir. However, the output is not consistent with kevin_bacon.expected in the example dir. Output I get is listed below (top lines) $ a.out William Shatner has a Bacon number of 0 has a Bacon number of 1 Denise Richards has a Bacon number of 0 has a Bacon number of 0 Patrick Stewart has a Bacon number of 0 has a Bacon number of 0 Steve Martin has a Bacon number of 0 Gerard Depardieu has a Bacon number of 0 has a Bacon number of 0 Clint Howard has a Bacon number of 0 Sean Astin has a Bacon number of 0 ..... (basically, all values are zero) except the first. http://www.boost.org/libs/graph/example/kevin-bacon.cpp I am using boost version 1.33.0/x86_64/include/boost-1_33 gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-52) If possible, can someone please check whether the output you get is the correct one ? regards, -harsh

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[iterator] joint_iterator?
by Shunsuke Sogame 10 Apr '06

10 Apr '06

Hi gurus, I compared Boost.MPL Views... http://www.boost.org/libs/mpl/doc/refmanual/views.html with Boost.Iterator adaptors... http://www.boost.org/libs/iterator/doc/index.html#specialized-adaptors I think joint_iterator seems missing from Boost.Iterator. Is such iterator impossible or prohibited by STL? -- Shunsuke Sogame

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[BGL] bug in PLOD algorithm
by Johan Oudinet 10 Apr '06

10 Apr '06

Hi, I'm using Parrallel Boost Graph Library to generate some graphs and compute their pagerank. I found the PLOD algorithm and I'd like using it with bidirected graphs. But, the PLOD algorithm generates self_edges whereas I put allow_self_edges to false. I look at the code in plod_generator.hpp and found that the next(directed_tag) function never uses allow_self_edges boolean ! I think it's a bug... I suggest replace: current.second = x(*gen); with: do { current.second = x(*gen); } while (current.first == current.second && !allow_self_loops); Regards, -- Johan

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