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BGL: Can bundled properties not be a struct or class name?
by Jean-Olivier Racine 29 Feb '08

29 Feb '08

Good day, I have a graph with bundled properties attached to both the vertices and edges. typedef long int ASElementID; enum ASRelationships { NoRelationship, IsContaining, IsBeside, IsAbove, IsCommentedBy, IsMadeOf }; typedef boost::adjacency_list<boost::vecS, boost::listS, boost::bidirectionalS, ASElementID, ASRelationships> Graph; When using the write_graphviz and writing my property writer, I get the error_property_not_found error. Reading post 18294 (http://thread.gmane.org/gmane.comp.lib.boost.user/18294) I see what I should probably do. My problem is that I cannot give the address of ASElementID since it is an int. Is it a limitation? Do I *have* to use a struct for it to work? Something like: struct IDType {int ID}; Thanks and have a nice weekend! Jean-Olivier

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[boost test] question on exception testing
by Ovanes Markarian 29 Feb '08

29 Feb '08

Hello *, I have a question regarding the tools BOOST_<level>_THROW: Why is it required to specify the exception being thrown? What if I don't know which exception is thrown, but I know that it should be thrown? My use case is: I have a worker class which executes some functionality. I know that the functionality will throw, but I would like to test that my class will remain in the consistent state after the exception was thrown? With BOOST_<level>_THROW(class_inst.execute()) I could spare the try{}catch(...){} block and make other test assertions, but unfortunately it is not possible, due to lacking of this utility. I would propose a throw guard into the lib, which does not produce any assertion, but swallows an exception. My intention is: I have to develop inside of a huge framework. The functionality I am trying to execute will only work on a target hardware. Since I am inside a debugger and not going to test the the executed functionality itself, but check the state of my class I think such a tool might help. With Kind Regards, Ovanes

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Re: [Boost-users] A request for help using the Boost Unit Test Library
by Tim Allison 29 Feb '08

29 Feb '08

> > Message: 2 > Date: Thu, 28 Feb 2008 18:44:34 +0000 (UTC) > From: Gennadiy Rozental <rogeeff(a)gmail.com> > Subject: Re: [Boost-users] A request for help using the Boost Unit > Test Library > To: boost-users(a)lists.boost.org > Message-ID: <loom.20080228T184232-270(a)post.gmane.org> > Content-Type: text/plain; charset=us-ascii > > Tim Allison <tallison <at> meicompany.com> writes: >>> What compiler are u using? Can you post compilation command? These errors > may >>> only mean that you doing something funny during compilation and compiler > do >>> not see BOOST_AUTO_TEST_CASE macro. >> I am using Gnu compiler 4.1.3-29. I have reduced the number of >> switches, so that the actual line used to build is: >> g++ -g -I../lib -I/usr/X11R6/include -I../../../source/ecs/shared >> -DOS_IS_LINUX -c FuserTests.cc > > Where is boost include? Can you generate preprocessed code? Do you see boost > test code? what do u see in place of BOOST_AUTO_TEST_CASE( test1 )? > > Gennadiy > I ran the -E option on the Gnu compiler. Here is what I hope is the relevant output (at the end of the 38K resulting file!): inline test_case* make_test_case( callback0<> const& test_func, const_string tc_name ) { return new test_case( ut_detail::normalize_test_case_name( tc_name ), test_func ); } template<typename UserTestCase> inline test_case* make_test_case( void (UserTestCase::*test_method )(), const_string tc_name, boost::shared_ptr<UserTestCase> const& user_test_case ) { return new test_case( ut_detail::normalize_test_case_name( tc_name ), ut_detail::user_tc_method_invoker<UserTestCase>( user_test_case, test_method ) ); } } } # 1 "/usr/include/boost/test/detail/enable_warnings.hpp" 1 3 4 # 246 "/usr/include/boost/test/unit_test_suite.hpp" 2 3 4 # 20 "/usr/include/boost/test/unit_test.hpp" 2 3 4 # 5 "FuserTests.cc" 2 BOOST_AUTO_TEST_CASE( test1 ) { boost::test_tools::tt_detail::check_impl( (2 == 1), boost::wrap_stringstream().ref() << boost::unit_test::literal_string( "2 == 1", sizeof( "2 == 1" ) - 1 ), boost::unit_test::literal_string( "FuserTests.cc", sizeof( "FuserTests.cc" ) - 1 ), (std::size_t)12, boost::test_tools::tt_detail::CHECK, boost::test_tools::tt_detail::CHECK_PRED, 0 ); } BOOST_AUTO_TEST_CASE( test2 ) { int i = 0; boost::test_tools::tt_detail::check_frwd( boost::test_tools::tt_detail::equal_impl_frwd(), boost::wrap_stringstream().ref() << "", boost::unit_test::literal_string( "FuserTests.cc", sizeof( "FuserTests.cc" ) - 1 ), (std::size_t)23, boost::test_tools::tt_detail::CHECK, boost::test_tools::tt_detail::CHECK_EQUAL , i, "i" , 2, "2" ); boost::test_tools::tt_detail::check_frwd( boost::test_tools::tt_detail::equal_impl_frwd(), boost::wrap_stringstream().ref() << "", boost::unit_test::literal_string( "FuserTests.cc", sizeof( "FuserTests.cc" ) - 1 ), (std::size_t)25, boost::test_tools::tt_detail::CHECK, boost::test_tools::tt_detail::CHECK_EQUAL , i, "i" , 0, "0" ); } Tim

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Filter packages from a device e.g. network
by Hansi 29 Feb '08

29 Feb '08

Hello, I have a question regarding to filter packages from a device. What is the best way (high performance and not to much copies of the data) to filter data. e.g. I need a filter to make packages from a tcp stream. In this case I have first a field with the length of the package. Best regards Hansjörg

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Using bind with function objects
by Olaf Peter 29 Feb '08

29 Feb '08

Hi, this test file doesn't compile, but why? $ LANG=en g++ bind.cpp -o bind && ./bind /usr/include/boost/bind.hpp: In member function 'R boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<R>, F&, A&, long int) [with R = int, F = Foo, A = boost::_bi::list2<const char*&, const int&>, A1 = boost::arg<1> (*)(), A2 = boost::arg<2> (*)()]': /usr/include/boost/bind/bind_template.hpp:89: instantiated from 'typename boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()(A1&, const A2&) [with A1 = const char*, A2 = int, R = int, F = Foo, L = boost::_bi::list2<boost::arg<1> (*)(), boost::arg<2> (*)()>]' bind.cpp:22: instantiated from here /usr/include/boost/bind.hpp:278: error: void value not ignored as it ought to be Thanks, Olaf

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[Graph] A* with an implicit graph?
by Ian Downes 28 Feb '08

28 Feb '08

I'd like to do shortest path on an implicit graph - i.e. building it as I go, on examining a vertex I'd like to add the adjacent edges before continuing. Is this supported? If so, can someone point me in the right direction? If not, how could I do this in boost? The boost astar algorithm claims to support implicit graphs using a modified version of the boost bfs algorithm (nonconst_bfs.hpp). This modified version didn't exist in my distribution so I followed the comments in a document from the authors (link below) and removed the const requirements for the graph in breadth_first_search.hpp. The example (implicit example from pdf below, pg 12) compiles ok but seg faults when trying to add a vertex (vertex_t v = add_vertex(vert_prop(white_color), g); page 16 of pdf) in the visitor (some adds succeed first). Any ideas? http://www.cs.rpi.edu/~beevek/research/astar_bgl04.pdf thanks Ian

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problem while using lapack binding
by Baris Gokce 28 Feb '08

28 Feb '08

Hello, I have downloaded binding of boost from http://news.tiker.net/dl/software/boost-bindings and copied them under the boost/numeric. In my code, I am using 'gesvd' function of lapack. There is no compilation error, but while linking following undefined reference to '_dgesvd' error occurs: ../../lib/libTemp.a(MatrixOperationsDefault.o): In function `_ZN16MatrixOperations6MO_svdERN5boost7numeric5ublas6matrixIdNS2_15basic_row_majorIjiEENS2_15unbounded_arrayIdSaIdEEEEESA_SA_SA_': /cygdrive/e/workspace3_2/Locomotion/BOUN/Locomotion/src/MatrixOperations.cc:159: undefined reference to `_dgesvd_' ../../lib/libTemp.a(MatrixOperationsDefault.o): In function `_ZN16MatrixOperations6MO_svdERN5boost7numeric5ublas6matrixIdNS2_15basic_row_majorIjiEENS2_15unbounded_arrayIdSaIdEEEEESA_SA_SA_': /cygdrive/c/boost/boost/numeric/ublas/exception.hpp:127: undefined reference to `_dgesvd_' collect2: ld returned 1 exit status make: *** [test.exe] Error 1 Do I have to compile boost with added binding files again? If yes, how? Best Regards...

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Re: [Boost-users] A request for help using the Boost Unit Test Library
by Tim Allison 28 Feb '08

28 Feb '08

> ------------------------------ > > Message: 4 > Date: Thu, 28 Feb 2008 16:56:15 +0000 (UTC) > From: Gennadiy Rozental <rogeeff(a)gmail.com> > Subject: Re: [Boost-users] A request for help using the Boost Unit > Test Library > To: boost-users(a)lists.boost.org > Message-ID: <loom.20080228T165213-642(a)post.gmane.org> > Content-Type: text/plain; charset=us-ascii > > Tim Allison <tallison <at> meicompany.com> writes: > >> // each test module could contain no more then one ..... function defined >> // alternatively you could define init function yourself >> #define BOOST_TEST_MAIN >> #include <boost/test/unit_test.hpp> >> >> //___________________________________________________________________// >> >> // most frequently you implement test cases as a .... utomatic registration >> BOOST_AUTO_TEST_CASE( test1 ) > > You mean to say error is on above line, right? > >> The error messages are: >> FuserTests.cc:9: error: expected constructor, destructor, or type >> conversion before '(' token >> FuserTests.cc:18: error: expected constructor, destructor, or type >> conversion before '(' token > > What compiler are u using? Can you post compilation command? These errors may > only mean that you doing something funny during compilation and compiler do > not see BOOST_AUTO_TEST_CASE macro. I am using Gnu compiler 4.1.3-29. I have reduced the number of switches, so that the actual line used to build is: g++ -g -I../lib -I/usr/X11R6/include -I../../../source/ecs/shared -DOS_IS_LINUX -c FuserTests.cc Tim Allison > > Gennadiy > > > >

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lexical_cast not throwing exception when converting negative value to UINT
by Kris Wragg 28 Feb '08

28 Feb '08

Dear subscribers, I am using lexical_cast to cast a string to an UINT, unfortunately, it is not throwing an exception if a value is negative. Example: std::wstring failString = L"-1"; UINT nTest = boost::lexical_cast<UINT>(failString); This does not throw a bad_lexical_cast exception, which it should, as -1 is not a valid unsigned integer. Perhaps I am using the wrong function, or using this one incorrectly, I've only just started using boost after moving to a new project that's not based on ancient legacy code! Regards, Kris Wragg ________________________________ This email and all attachments transmitted with it contain confidential information belonging to the sender. It is intended only for the addressee(s) stated above. Should you not be the intended recipient then any disclosure, copying, distribution or the taking of any action in reliance on the contents of this email is strictly prohibited. If you have received this transmission in error, please notify the sender immediately and permanently delete this message and destroy any copies. Internet communications cannot be guaranteed to be timely, secure, error-free or virus-free and Sender expressly does not warrant or guarantee that this e-mail is virus free. Recipient is advised to protect itself by taking the necessary steps to ensure that appropriate security measures are in place and to utilize a virus scanner before opening any attachment or down loading any information or documentation using links or other contents in this e-mail. You may opt out of receiving future communications from us by replying to this e-mail and replacing the subject line with UNSUBSCRIBE.

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[mpl] Hierarchy Generation
by Scott Meyers 28 Feb '08

28 Feb '08

I have a set of types representing features code might have, e.g., typedef mpl::vector<ExceptionSafe, ThreadSafe, ReallyFast, GPLed> Features; These can occur in any combination as sets of features, e.g., tyepdef FeatureSet<ExceptionSafe> F1; typedef FeatureSet<ThreadSafe, ExceptionSafe> F2; typedef FeatureSet<ReallyFast, ExceptionSafe, GPLed> F3; There should be an implicit conversion from one FeatureSet to another if and only if we don't lose any features in the conversion. So converting from F1 to F2 or F3 is okay (since both F2 and F3 contain ExceptionSafe), but converting from F2 to F3 is not okay (because we'd lose ThreadSafe). Furthermore, a conversion that adds fewer features is preferable to one that adds more, so the conversion from F1 to F2 is better than the conversion from F1 to F3 (because the former adds only one feature while the latter adds two). I'm looking for a way to automatically generate an inheritance hierarchy that will give me the behavior I've described. For the above example, the hierarchy has four levels. The root is all the features, because any subset of features is permitted to be implicitly convertible to the set of all features. Root: FeatureSet<ExceptionSafe, ThreadSafe, ReallyFast, GPLed> The leaves are the individual features: Leaves: FeatureSet<ExceptionSafe> FeatureSet<ThreadSafe> FeatureSet<ReallyFast> FeatureSet<GPLed> The next level up is pairs of features: One level FeatureSet<ExceptionSafe, ThreadSafe> up from FeatureSet<ExceptionSafe, ReallyFast> leaves: FeatureSet<ExceptionSafe, GPLed> ... The next level up (which is one below the root) is triplets of features: One level FeatureSet<ExceptionSafe, ThreadSafe, ReallyFast> down from FeatureSet<ExceptionSafe, ThreadSafe, GPLed> root: FeatureSet<ExceptionSafe, ReallyFast, GPLed> ... In general, given a list of n features, I need a hierarchy n levels deep, with one class at the root, n classes at the leaves, and m-wise combinations of the n features at the intervening levels (where m varies from 2 to n-1). Fortunately, I don't need to worry about permutations of the ordering of the features, because I already have a way to canonically order them. (Not a great way, but it works, and that's a different problem.) Is there some way for me to use the MPL to automatically generate the hierarchy I need? Thanks, Scott

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