January 2009 - Boost-users - lists.preview.boost.org

asio multicast cross-platform issues
by Birju Prajapati 26 Jan '09

26 Jan '09

Hi, On WinXP, I successfully implemented an application that listens to multiple multicast groups (different IPs same port). When I recompiled that app on Linux, on another box, I started getting duplicate datagrams. After messing around for a long while, I got it working. I had to change two things: socket.bind was changed so that it no longer was given 'any' and the port, but the multicast address and port. socket.set_option was changed so that it no longer was given only the multicast address, but both the multicast address and local address. Moving this code back to Windows stops it working! I then stumbled across this while researching my issue: http://osdir.com/ml/lib.boost.asio.user/2007-04/msg00135.html I could not find this information anywhere in the documentation. Could someone point me in the right place? Does it also mean that the statement "Boost.Asio is a cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach." In the docs is inaccurate for multicast? If not, is there a cross-platform, asio way? Cheers, Birju Schneider Trading 4th Floor, 25 Copthall Avenue London EC2R 7BP -------------------------------------------------------- Message from: Birju.Prajapati(a)schneidertrading.com Message to: boost-users(a)lists.boost.org Attached files: 0 This e-mail and any files transmitted with it are confidential, may be legally privileged, and are for the sole use of the intended recipient. Copyright in this e-mail and any accompanying document created by us is owned by us. If you are not the intended recipient of this e-mail or any part of it please telephone our IT Department at the number shown above or by e-mail at info(a)schneidertrading.com. You should not use or disclose to any other person the contents of this e-mail or its attachments (if any), nor take copies. This e-mail is not a representation or warranty and is not intended nor should it be taken to create any legal relations, contractual or otherwise. Schneider Trading Associates Ltd (Registration No. 3692131) is incorporated in England and Wales and the registered office is at 25 Copthall Avenue, London EC2R 7BP. The company is authorised and regulated by the Financial Services Authority

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Re: [Boost-users] Using different compilers with boost
by Dan Smithers 26 Jan '09

26 Jan '09

>> I need to use several compilers for my project for different target >> computers. I have built boost 1.37 for gcc 4.1.2 and 3.4.3 and >> everything seems to be nicely set up as >> <boost_dir>/lib/libboost_xxx-gcc34-mt-1_37.so and >> <boost_dir>/lib/libboost_xxx-gcc41-mt-1_37.so. >> >> Is there anyway of automatically detecting which version to link? I >> suppose that gcc --version and some sort of awk script could do this. >> > > gcc -dumpversion is more useful for automated processing. > > For example, > gcc -dumpversion | perl -p -e > 's/(\d)\.(\d)\.\d/-lboost_xxx-gcc$1$2-mt-1_37/' Thanks Steven, just what I was looking for. dan

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Re: [Boost-users] Fwd: Newbie: Eclipse and Boost
by raindog＠macrohmasheen.com 26 Jan '09

26 Jan '09

Based on your eloquent description I'm guessing you're running ms-dos 6.5 and have eclipse 0.5 beta installed in text mode. Perhaps the situation is different, in which case I would need correcting. ------Original Message------ From: n0b0dy-at-home Sender: boost-users-bounces(a)lists.boost.org To: boost-users(a)lists.boost.org ReplyTo: boost-users(a)lists.boost.org Sent: Jan 25, 2009 4:25 AM Subject: [Boost-users] Fwd: Newbie: Eclipse and Boost Hiya, i'm about to make my first steps with boost... unfortunately eclipse says "boost/shared_ptr.hpp: No such file or directory"; i've included the boost-path, so what's my mistake? Greetings n0b0dy@home _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users Sent from my Verizon Wireless BlackBerry

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[program options] No value option in config file not allowed.
by Rodolfo Federico Gamarra 26 Jan '09

26 Jan '09

Hi all! I'm using parse_config_file to read my options from a file. Some of them are only a flag (ie no value given), like -z (--gzip), -h (--help) or -v (--verbose). What I see is that those options can be specified with the file only if some dummy value is given. For concreteness, let's say that the option is gzip. If I put gzip= the result is "Error: no value given in 'gzip='". If the = isn't put, then the message is "Error: unrecognized line in 'gzip'". Using spaces doesn't help because they are trimmed away. The method common_config_file_iterator::get() (config_file.cpp) seems to be involved: else if ((n = s.find('=')) != string::npos) { string name = m_prefix + trim_ws(s.substr(0, n)); string value = trim_ws(s.substr(n+1)); if (!allowed_option(name)) boost::throw_exception(unknown_option(name)); //// Doesn't allow empty values for an option. if (value.empty()) boost::throw_exception(invalid_syntax(s, "no value given")); found = true; this->value().string_key = name; this->value().value.clear(); this->value().value.push_back(value); break; } else { boost::throw_exception(invalid_syntax(s, "unrecognized line")); } The trimming may be handy, but it seems useful to allow empty values; on the other hand, it seems that whether an empty value is legal or not should be checked on a higher level. Thanks a lot. -- Rodolfo Federico Gamarra

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[ublas] warning on VC9 about checked iterators
by Peter Barker 25 Jan '09

25 Jan '09

Hello, Using Boost 1.37.0, I compile the following program under VC9 (VS .NET 2008 Express Edition): #include <boost/numeric/ublas/vector.hpp> class Host { public: Host(const boost::numeric::ublas::bounded_vector<double,3>& normal) : normal_(normal) {} private: boost::numeric::ublas::bounded_vector<double,3> normal_; }; int main() { return 0; } and I get the following warning: 1>c:\boost\boost_1_37_0\boost\numeric\ublas\storage.hpp(337) : warning C4996: 'std::copy': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' 1> c:\program files\microsoft visual studio 9.0\vc\include\xutility(2576) : see declaration of 'std::copy' 1> c:\boost\boost_1_37_0\boost\numeric\ublas\storage.hpp(334) : while compiling class template member function 'boost::numeric::ublas::bounded_array<T,N>::bounded_array(const boost::numeric::ublas::bounded_array<T,N> &)' 1> with 1> [ 1> T=double, 1> N=3 1> ] 1> c:\boost\boost_1_37_0\boost\numeric\ublas\vector.hpp(36) : see reference to class template instantiation 'boost::numeric::ublas::bounded_array<T,N>' being compiled 1> with 1> [ 1> T=double, 1> N=3 1> ] 1> c:\boost\boost_1_37_0\boost\numeric\ublas\vector.hpp(524) : see reference to class template instantiation 'boost::numeric::ublas::vector<T,A>' being compiled 1> with 1> [ 1> T=double, 1> A=boost::numeric::ublas::bounded_array<double,3> 1> ] 1> c:\newsystem\readdisplaystlascii\readdisplaystlascii\main.cpp(10) : see reference to class template instantiation 'boost::numeric::ublas::bounded_vector<T,N>' being compiled 1> with 1> [ 1> T=double, 1> N=3 1> ] Should I compile with -D_SCL_SECURE_NO_WARNINGS? Is there a fix coming for ublas? What do others do? Regards, Pete

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Fwd: Newbie: Eclipse and Boost
by n0b0dy-at-home 25 Jan '09

25 Jan '09

Hiya, i'm about to make my first steps with boost... unfortunately eclipse says "boost/shared_ptr.hpp: No such file or directory"; i've included the boost-path, so what's my mistake? Greetings n0b0dy@home

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Boost and K-Cuts
by Gianni Loiacono 25 Jan '09

25 Jan '09

Hi all, sorry for my poor english. I want to know if the algorithm explained in this paper:http://www.cc.gatech.edu/~vazirani/k-cut.ps for finding the k-cuts (algorithm efficient) was been development in boost. In other words: There is in BGL some procedure that can cuts minimal a graph? Thanks a lot for the help :) Bye

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Is there any internal mechanics to add support for regular expression checks to output_test_stream? (UTF)
by Pauli Nieminen 25 Jan '09

25 Jan '09

Hello! So long description is that. I'm trying to write unit test for log subsystem to my project. The logging sub system outputs timestamps which would be easiest to match with regular expression in unit tests. Of course I could disable the timestamp output for unit test but I think there might be many others test cases where regular expression would be the simplest solution. I tried to search for existing solution but it seems like none has been looking for this kind of support in unit test library.So my idea for implementing the regular expression support in my project is extending current output_test_stream class with my own code. So example test case should look something like (of course using a fixture in real code): BOOST_AUTO_TEST_CASE ( stream_check ) { output_test_stream stream; log::logger log(stream); log.log_entry(<level>, <component>) << "test log messange."; boost::regex validator("\\d{8,8} \\d\\d:\\d\\d:\\d\\d <level> <component>: test log message."); BOOST_CHECK( stream.is_equal(validator) ); } Pauli PS. "Detailed specification of class output_test_stream is covered in reference section. " (documentation/Output testing tool) Where is that reference section for detailed specification? The best I could find is the source code. :)

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[lambda] std::sort problem
by Michał Nowotka 25 Jan '09

25 Jan '09

Following code does not compile: sort(m_results->begin(), m_results->end(), lambda::_1->second > lambda::_2->second); where: m_result is type of std::vector<std::pair<const SomeClass*,double>* > vs2008 compiler says: error C2780: 'void std::sort(_RanIt,_RanIt)' : expects 2 arguments - 3 provided, see declaration of 'std::sort' but in lamda documentation there is similar example: sort(vp.begin(), vp.end(), *_1 > *_2); so what's wrong with my code? -- Michał Nowotka

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Re: [Boost-users] boost geometry lib
by Andruit＠gmx.de 25 Jan '09

25 Jan '09

Thanks Pete for your answer, but I can't manage to compile my source. I tried to compile one of the example programs but it failed. I am using a gcc compiler. Did you manage to compile the example programs? The following command failed: gcc -I/path-to-geometrielib 1_point_example.cpp -o point_example Do you know what is wrong??? Thank you. Andreas -- Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger

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