August 2010 - Boost-users - lists.preview.boost.org

[multi_index] looking for "equal_to and less than"
by isjk 02 Aug '10

02 Aug '10

hi, I've got a structure like this, struct peer { int md5_; // unique key. int rank_; int degrees_; }; now, I need a composite_key, it can find equal_to "md5" and less than "rank_" and "degrees_" less than 8. eg: md5 rank degrees 2 0 8 2 1 5 2 2 0 2 6 3 4 3 1 4 5 0 f(2, 2) return (2 1 5) f(2, 1) return null f(2, 6) return (2 2 0)(2 1 5) f(4, 5) return (4 3 1) Thanks. -- View this message in context: http://old.nabble.com/-multi_index--looking-for-%22equal_to-and-less-than%2… Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

Problem to substitute the std allocator with boost.asio and boost.filesystem
by watsonsong 02 Aug '10

02 Aug '10

I subsitute the std allocator with my own stl allocator, and defined a new string type like this: typedef std::basic_string<char, std::char_traits<char>, MySTLAllocator<char> > my_string; typedef std::basic_string<wchar_t, std::char_traits<wchar_t>, MySTLAllocator<wchar_t> > my_wstring; And I want to use them in my project, but I met some problem when I use boost.asio and boost.filesystem. The boost asio directly use std::string, I can not find a way to deal with it. I know I can pass a c style string char* to the asio, but it was less efficiency. When use the boost.filesystem, I tried this way, but I also met some problem: namespace MyNamespace { struct path_traits; typedef boost::filesystem::basic_path<my_string, path_traits> path; typedef boost::filesystem::basic_path<my_wstring, path_traits> wpath; struct path_traits { typedef my_string internal_string_type; typedef my_string external_string_type; static external_string_type to_external( const path &, const internal_string_type & src ) { return src; } static internal_string_type to_internal( const external_string_type & src ) { return src; } }; typedef boost::filesystem::basic_recursive_directory_iterator<path> recursive_directory_iterator; typedef boost::filesystem::basic_recursive_directory_iterator<wpath> wrecursive_directory_iterator; } namespace boost { namespace filesystem { template<> struct is_basic_path<MyNamespace::path> { BOOST_STATIC_CONSTANT( bool, value = true ); }; template<> struct is_basic_path<MyNamespace::wpath> { BOOST_STATIC_CONSTANT( bool, value = true ); }; } } namespace MyNamespace { inline bool is_directory( const path & ph ) { return boost::filesystem::is_directory<path>( ph ); } inline bool is_directory( const wpath & ph ) { return boost::filesystem::is_directory<wpath>( ph ); } } For replace all the function is a huge work, and in this way I can not replace it for I met this function, which is also use the std::string directly: BOOST_FILESYSTEM_DECL file_status status_api( const std::string & ph, system::error_code & ec ); Maybe this way is too bother, I think there must be an easy way to replace the string. Is there any way to resolve this? Thank you. -- View this message in context: http://old.nabble.com/Problem-to-substitute-the-std-allocator-with-boost.as… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

boost compile error
by Jack Bryan 02 Aug '10

02 Aug '10

Dear All: I am trying to install boost on MPI clsuter with MPICH2. After ./bjam install, I compile a test program provided by boost.org . But I got errors: The program is :-----------------------------------------------------------------#include <iostream>#include <boost/mpi/environment.hpp>#include <boost/mpi/communicator.hpp> namespace mpi = boost::mpi; int main(int argc, char* argv[]){ mpi::environment env(argc, argv); mpi::communicator world; std::cout << "I am process " << world.rank() << " of " << world.size() << "." << std::endl; return 0;}-------------------------------------------------------------- Errors: ------------------------------------------------------------------mpic++ -o testp2p test_p2p.cpp -I/home/boost_2010_8_1/boost_1_43_0 -L/home/boost_2010_8_1/boost_1_43_0/stage/lib -lboost_mpi -lboost_serialization/usr/bin/ld: warning: liblam.so.0, needed by /home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so, not found (try using -rpath or -rpath-link)/usr/bin/ld: warning: liblamf77mpi.so.0, needed by /home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so, not found (try using -rpath or -rpath-link)/usr/bin/ld: warning: liblammpi++.so.0, needed by /home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so, not found (try using -rpath or -rpath-link)/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_short'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_unsigned'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `PMPI::Comm::mpi_comm_map'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `op_intercept'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_errors_return'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `PMPI::Intracomm::current_op'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_comm_world'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_unsigned_char'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_char'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `PMPI::Comm::mpi_err_map'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_group_empty'/home/boost_2010_8_1/boost_1_43_0/stage/lib/libboost_mpi.so: undefined reference to `lam_mpi_packed'collect2: ld returned 1 exit status ------------------------------------------------------------------- It seems that it needs LAM/MPI. But, the LAM/MPI has been installed: PATH=/home/openmpi_123/bin:/home/boost_2010_8_1/boost_1_43_0: ....... I used ./bjam --prefix=mypathand then ./bjam and then ./bjam installAny help is appreciated. Any help is appreciated. thanks Jack Aug. 1 2010

1 0

[Polygon] Test among 3 libraries
by TONGARI 01 Aug '10

01 Aug '10

Hi, I just modified a test program taken from AGG's examples to test the polygon clipping capability of following libraries. *Boost.Polygon *GPC *Clipper Here are some observations: 1) The proccesing speed (fastest to slowest): Clipper > GPC > Boost.Polygon 2) With "xor", although the results seems the same, they have different countours numbers (Clipper the least). 3) Boost.Polygon has a strange behavior that it sometimes produces erroneous vertical lines within the polygons. In this example, with "or" operation you'll see that. I put the test files here: *http://tinyurl.com/2axoqxc Anyone who wants to compile it will also need AGG and *Clipper on your computer.

2 1

Boost.FSM in boost 1_42 (newbie)
by Doron Bar 01 Aug '10

01 Aug '10

Hi to all, I intended to use the boost.FSM library. I have install boot version 1.42 but the FSM lib is not there, only statechart. Did this library has been removed from boost? Thanks a lot, Doron Doron Bar Electro-Optics Division Soreq NRC, Yavne 81800 Israel Office: +972-8-9-434361 Mobile: +972-50-6292123 Home: +972-3-9640937 ************************************************************************************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses. ************************************************************************************

2 1