December 2009 - Boost-users

boost file system, copy directories, create directory structure
by Avi Bahra 02 Dec '09

02 Dec '09

With boost 1.39 file system, is it possible to copy directories . ie recursive copy likewise given a path, need a way of creating the directories ? Could have missed this, but could not find such functionality in boost file system -- Best regards, Ta, Avi

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Is GCC
by hce 02 Dec '09

02 Dec '09

Hi, I am using gcc version 4.3.0 and /lib64/libc-2.8.so on fedora 9, is it stable to use std::vector and std::map to contain shared_ptr<MyObject> MyObjectPtr? I've got libc.so Segmentation fault while accessing vector and map contain MyObjectPtr. Thank you. Kind regards, Jupiter

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[property_tree] utf8 and others
by Sergei Politov 02 Dec '09

02 Dec '09

Hi, I'm playing with new boost library property_tree. And I have several questions regarding it. 1) Suppose there is xml file with utf8 encoding. What is the best way to populate it into wptree? 2) How can I save wptree into xml file with utf8 encoding. Unfortunately write_xml requires wostream. 3) Is there something like map operator[]? I.e. I need the following behavior: wptree & something(some_path) { boost::optional<wptree &> child = my_tree.get_child(some_path); if(child) return child.get(); else return my_tree.put_child(some_path); } Best Regards, Sergei

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default value of program options
by Axel 02 Dec '09

02 Dec '09

Hi I m using program options classes to handles command line arguments (Boost version 1.35, Debian lenny packages). I don't manage to get this code work : boost::program_options::options_description cmd_line_options_("Command line options") ; boost::program_options::variables_map current_options_ ; int port_ = 0 ; cmd_line_options_.add_options() ("port,p", boost::program_options::value<int>(&port_), "specify the destination port to use") ; try { boost::program_options::store(boost::program_options::command_line_parser(argc, argv).options(cmd_line_options_).run(), current_options_) ; } catch(po::error &e) { cout << "Error when parsing command line arguments: " << e.what() << "\n" ; } cout << port_ << ":" << current_options_["port"].as<int>() << endl ; When executing : ./foo --port=12345, the output is : 0:12345 The port_ variable value remains to be 0 when the current_options_ variable hold the right value (12345). Could someone tell me what am I doing wrong ? Thanks

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Boost 1.41 compile error with gcc 4.2.4 on Solaris Sparc
by Teme 02 Dec '09

02 Dec '09

Hi, I have a problem to compile Boost 1.39 or 1.40 ro 1.41 on Solaris Sparck with gcc 4.2.4. I am tried to compile with bjam and witj Cmake but I will get the same assembler message about illegal operands error. I noticed that when I defined BOOST_SP_USE_PTHREADS everything compiled fine until I tried to compile my software using Boost. Then I got the same assembler message about illegal operands. Do You have any advice? Best Regards, Teemu Here is the error while running make: ~/boost-1.41.0.cmake0/build % make [ 0%] Building CXX object libs/date_time/src/CMakeFiles/ boost_date_time-mt-shared.dir/gregorian/greg_month.cpp.o /var/tmp//ccXu6PKl.s: Assembler messages: /var/tmp//ccXu6PKl.s:580: Error: Illegal operands /var/tmp//ccXu6PKl.s:595: Error: Illegal operands /var/tmp//ccXu6PKl.s:8504: Error: Illegal operands make[2]: *** [libs/date_time/src/CMakeFiles/boost_date_time-mt- shared.dir/gregorian/greg_month.cpp.o] Error 1 make[1]: *** [libs/date_time/src/CMakeFiles/boost_date_time-mt- shared.dir/all] Error 2 make: *** [all] Error 2 Here is the generated configuration output from Cmake: tes@kielo <arkki_Z4.4-481_0/HAR1>:~/utils/boost-1.41.0.cmake0/build % cmake ../. -- -- Boost.CMake version = 1.41.0.cmake0 -- Boost compiler = gcc -- Boost toolset = gcc42 -- Boost platform = sunos -- Build name = gcc-4.2.4-sunos -- -- Looking for (optional) dependencies on the system -- -- BZip2: -- BZIP2_INCLUDE_DIR = /usr/include -- BZIP2_DEFINITIONS = -- BZIP2_LIBRARIES = /usr/lib/libbz2.so -- -- Doxygen: -- DOXYGEN_EXECUTABLE = /C2/tools/utils/bin/doxygen -- DOXYGEN_DOT_FOUND = YES -- DOXYGEN_DOT_EXECUTABLE = /C2/tools/utils/bin/dot -- DOXYGEN_DOT_PATH = /C2/tools/utils/bin -- -- Expat: -- Expat not found, some libraries or features will be disabled. -- See the documentation for Expat or manually set these variables: -- EXPAT_INCLUDE_DIR = EXPAT_INCLUDE_DIR-NOTFOUND -- EXPAT_LIBRARIES = -- -- ICU: -- Disabled since WITH_ICU=OFF -- -- MPI: -- MPI not found, some libraries or features will be disabled. -- See the documentation for MPI or manually set these variables: -- MPI_INCLUDE_PATH = MPI_INCLUDE_PATH-NOTFOUND -- MPI_COMPILE_FLAGS = -- MPI_LINK_FLAGS = -- MPI_LIBRARIES = MPI_LIBRARY-NOTFOUND -- -- Python: -- Disabled since WITH_PYTHON=OFF -- -- Xsltproc: -- XSLTPROC_EXECUTABLE = /usr/bin/xsltproc -- XSLTPROC_FLAGS = --xinclude -- -- Valgrind: -- Disabled since WITH_VALGRIND=OFF -- -- ZLib: -- ZLIB_INCLUDE_DIR = /usr/include -- ZLIB_LIBRARIES = /usr/lib/libz.so -- -- Install include dir: = include/boost-1.41.0 -- Install lib dir: = lib/boost-1.41.0 -- -- Reading boost project directories... -- -- + preprocessor -- + concept_check -- + property_map -- + config -- + mpl -- + type_traits -- + function -- + iterator -- + smart_ptr -- + exception -- + utility -- + integer -- + detail -- + static_assert -- + tuple -- + function_types -- + fusion -- + typeof -- + proto -- + intrusive -- + logic -- + numeric -- + xpressive -- + optional -- + tokenizer -- + io -- + bind -- + date_time -- + thread -- + regex -- +-- ICU (unicode) not available, disabling support. -- + algorithm -- + range -- + foreach -- + array -- + functional -- + unordered -- + pool -- + spirit -- + variant -- + serialization -- + format -- + math -- + multi_index -- + any -- + random -- + graph -- + python -- +-- disabled since PYTHON_FOUND is false -- + parameter -- + accumulators -- + system -- + asio -- + circular_buffer -- + ptr_container -- + assign -- + bimap -- + compatibility -- + conversion -- + crc -- + timer -- + test -- + disjoint_sets -- + dynamic_bitset -- + filesystem -- + interprocess -- + flyweight -- + gil -- + mpi -- +-- MPI not found, disabling. -- + graph_parallel -- +-- MPI not found, disabling. -- + iostreams -- + lambda -- + multi_array -- + program_options -- + rational -- + signals -- + signals2 -- + statechart -- + tr1 -- + units -- + wave -- -- Reading boost project TEST directories... -- -- -- Skipping config of tools since BUILD_TOOLS is "NONE" -- -- Configuring done -- Generating done -- Build files have been written to: /home/tes/utils/ boost-1.41.0.cmake0/build

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Boost iostreams bzip2/zlib autolink problem
by ChristinaGE 02 Dec '09

02 Dec '09

Hello, I am using the boost iostreams with the bzip2 qnd zlib filters. I built boost according to the directions here: http://www.boost.org/doc/libs/1_40_0/libs/iostreams/doc/installation.html This created the following libraries in the boost/stage/lib directory: libboost_bzip2-vc90-mt libboost_bzip2-vc90-mt-1_40 libboost_bzip2-vc90-mt-gd libboost_bzip2-vc90-mt-gd-1_40 libboost_zlib-vc90-mt libboost_zlib-vc90-mt-1_40 libboost_zlib-vc90-mt-gd libboost_zlib-vc90-mt-gd-1_40 now, here is the problem.. on every machien I usually do this on, it "autolinks" these libraries.. I have just started to build my code on a new machine, and for some reason it is not autolinking them. So to get my code to work I have to manually add them to my dependencies list and also add the directory where they are located. >From the link above it seems not to autolink of you have the preprocessor variable BOOST_IOSTREAMS_NO_LIB defined, but I dont seem to have that defined anywhere. Does anyone know why these libraries may not be autolinked? Thanks! Christy

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Re: [Boost-users] boost lambda for processing std::vector
by CR Koudella 02 Dec '09

02 Dec '09

Thanks for your answer. I see, I am pretty out of time here. I will look into phoenix. Can you provide an indication as to how you would handle my example with phoenix? That would be of great help. PS: If this message doesn't end up in the right thread, I apologize. I haven't figured out how to reply to the list... Do I have to not user list receive messages in a digest, but receive them one by one?

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[OT] Interested in good (fast, robust) boost-based JSON API
by Dominique Devienne 01 Dec '09

01 Dec '09

Can anyone recommend one such good targeted library up to Boost's standards you've had good success with? (with a boost-like commercial friendly license) I guess it would need to be Tuple and Spirit based to be well integrated to Boost, although it could also have a polymorphic base json::value class too. Thanks for any insights. --DD PS: C++ JSON libraries listed at http://json.org/ don't seem quite up to the task, thus my post. PPS: If Spirit-based, a library using Spirit V2 as released in Boost 1.41 would be preferred.

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How to return a Null pointer for shared_ptr
by hce 01 Dec '09

01 Dec '09

Hi, I defined a shared_ptr in to a map table. How can I return a NULL pointer in a function to search the table if it is not found as following example? typedef shared_ptr<int> IntPtr; typedef std::map<std::string IntPtr> MapTable; MapTable mt; IntPtr search(const std::string& key) { MapTable::const_iterator it = mt.find(key); if (it == mt.end()) { return NULL; // can't compile it?? } return it->second; } Thank you. Kind regards, Jupiter

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[asio]boost1.40.0/gcc3.2.3 compile error
by victor 01 Dec '09

01 Dec '09

hello, can gcc3.2.3 compile boost1.40.0? On linux2.5/gcc3.2.3, I get compile error: invalid use of undefined type `struct boost::asio::detail::has_result_type<const char*>' /usr/local/boost_1_40_0/boost/asio/read_until.hpp:55: declaration of `struct boost::asio::detail::has_result_type<const char*>' invalid use of undefined type `struct boost::asio::detail::has_result_type<const char*>' /usr/local/boost_1_40_0/boost/asio/read_until.hpp:55: declaration of `struct boost::asio::detail::has_result_type<const char*>' enumerator value for `value' not integer constant make: *** [] 错误 1 All is ok in gcc4.1.2. How to compile the program using boost::asio on gcc3.2.3? Any suggestion is appreciated.

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