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[serialization] C alternative for boost serialization
by Arash Abghari 13 Mar '13

13 Mar '13

Hi, We are heavily using boost serialization and verty happy with that. But we need to port some of our code to an embedded system where there is no c++ compiler available. Can anyone suggest an alternative C library for serialization? Thanks, Arash

3 3

[Format] NaN values?
by John M. Dlugosz 13 Mar '13

13 Mar '13

Hmm, might boost::format("%.1f") be producing a result of "-1.$" when fed a NAN? It looks suspiciously like the string "-1.#INF" mentioned in printf formatting documentation.

1 0

Building Boost for iOS projects
by Daniel Ford 13 Mar '13

13 Mar '13

I'm trying to use some of the compiled boost libraries for an iOS project. Ideally, it would be nice to get a framework, but getting anything which works would be great. I've tried following the instructions here http://goodliffe.blogspot.com/2010/09/building-boost-framework-for-ios-ipho…<http://www.google.com/url?q=http%3A%2F%2Fgoodliffe.blogspot.com%2F2010%2F09…> to build a boost framework, making the obvious changes to the version numbers of the SDK and Boost, and swapping the compiler to llvm-gcc-4.2 because I don't seem to have gcc-4.2. However, I get errors like this: boostoniphone/src/boost_1_52_0/tools/build/v2/build/feature.jam:767: in expand-composites from module feature error: explicitly-specified values of non-free feature <toolset-darwin:version> conflict error: existing values: 4.2.1~iphonesim 6.0.0~iphonesim error: value from expanding <toolset-darwin:version>6.0.0~iphonesim : 6.0.0~iphonesim I've also been trying this approach here http://www.a-coding.com/2011/01/building-boost-for-ios.html<http://www.google.com/url?q=http%3A%2F%2Fwww.a-coding.com%2F2011%2F01%2Fbui…> which seems to be building most of the .a files OK. I'm not particularly experienced with build systems and libraries (I do algorithms and statistics usually) so I have a few of questions: Is there some obvious way to make the framework script work? Is there some way to just use the .a files I'm getting from the second approach and bundle them up? Or do I just add the .a files generated by the second approach to my project and be done with it? Has anyone else done this by another method, or can suggest how to set user-config.jam to get the libraries I want? Thanks, Daniel

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program_options - example will not compile
by Neil Sutton 12 Mar '13

12 Mar '13

I have the following: 1. */usr/local/lib/* which contains libboost_program_options.a libboost_program_options.so libboost_program_options.so_1.53.0 2. /usr/local/include/boost that contains program_options.hpp I want to compile this file which can be found in boost /libs/program_options/examples: ---------------------------------- // Copyright Vladimir Prus 2002-2004. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt // or copy at http://www.boost.org/LICENSE_1_0.txt) /* The simplest usage of the library. */ #include <boost/program_options.hpp> namespace po = boost::program_options; #include <iostream> #include <iterator> using namespace std; int main(int ac, char* av[]) { try { po::options_description desc("Allowed options"); desc.add_options() ("help", "produce help message") ("compression", po::value<double>(), "set compression level") ; po::variables_map vm; po::store(po::parse_command_line(ac, av, desc), vm); po::notify(vm); if (vm.count("help")) { cout << desc << "\n"; return 0; } if (vm.count("compression")) { cout << "Compression level was set to " << vm["compression"].as<double>() << ".\n"; } else { cout << "Compression level was not set.\n"; } } catch(exception& e) { cerr << "error: " << e.what() << "\n"; return 1; } catch(...) { cerr << "Exception of unknown type!\n"; } return 0; } ----------------------------- A. g++ error. This is the command I am using with g++ g++ first.cpp -o first -L/usr/local/lib/libboost_program_options.so and this is the error output: ------------ /tmp/cctMoqyr.o: In function `main': first.cpp:(.text+0x1a): undefined reference to `boost::program_options::options_description::m_default_line_length' first.cpp:(.text+0x2a): undefined reference to `boost::program_options::options_description::m_default_line_length' first.cpp:(.text+0x72): undefined reference to `boost::program_options::options_description::options_description(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned int, unsigned int)' first.cpp:(.text+0xed): undefined reference to `boost::program_options::options_description::add_options()' first.cpp:(.text+0x10b): undefined reference to `boost::program_options::options_description_easy_init::operator()(char const*, char const*)' first.cpp:(.text+0x127): undefined reference to `boost::program_options::options_description_easy_init::operator()(char const*, boost::program_options::value_semantic const*, char const*)' first.cpp:(.text+0x135): undefined reference to `boost::program_options::variables_map::variables_map()' first.cpp:(.text+0x191): undefined reference to `boost::program_options::store(boost::program_options::basic_parsed_options<char> const&, boost::program_options::variables_map&, bool)' first.cpp:(.text+0x1e6): undefined reference to `boost::program_options::notify(boost::program_options::variables_map&)' first.cpp:(.text+0x28b): undefined reference to `boost::program_options::operator<<(std::basic_ostream<char, std::char_traits<char> >&, boost::program_options::options_description const&)' /tmp/cctMoqyr.o: In function `boost::program_options::error_with_option_name::~error_with_option_name()': first.cpp:(.text._ZN5boost15program_options22error_with_option_nameD2Ev[boost::program_options::error_with_option_name::~error_with_option_name()]+0xd): undefined reference to `vtable for boost::program_options::error_with_option_name' /tmp/cctMoqyr.o: In function `boost::program_options::validation_error::validation_error(boost::program_options::validation_error::kind_t, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)': first.cpp:(.text._ZN5boost15program_options16validation_errorC1ENS1_6kind_tERKSsS4_i[boost::program_options::validation_error::validation_error(boost::program_options::validation_error::kind_t, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)]+0x1d): undefined reference to `boost::program_options::validation_error::get_template(boost::program_options::validation_error::kind_t)' first.cpp:(.text._ZN5boost15program_options16validation_errorC1ENS1_6kind_tERKSsS4_i[boost::program_options::validation_error::validation_error(boost::program_options::validation_error::kind_t, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)]+0x47): undefined reference to `boost::program_options::error_with_option_name::error_with_option_name(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' /tmp/cctMoqyr.o: In function `boost::program_options::value_semantic_codecvt_helper<char>::value_semantic_codecvt_helper()': first.cpp:(.text._ZN5boost15program_options29value_semantic_codecvt_helperIcEC2Ev[boost::program_options::value_semantic_codecvt_helper<char>::value_semantic_codecvt_helper()]+0x16): undefined reference to `vtable for boost::program_options::value_semantic_codecvt_helper<char>' /tmp/cctMoqyr.o: In function `boost::program_options::value_semantic_codecvt_helper<char>::~value_semantic_codecvt_helper()': first.cpp:(.text._ZN5boost15program_options29value_semantic_codecvt_helperIcED2Ev[boost::program_options::value_semantic_codecvt_helper<char>::~value_semantic_codecvt_helper()]+0xb): undefined reference to `vtable for boost::program_options::value_semantic_codecvt_helper<char>' /tmp/cctMoqyr.o: In function `boost::program_options::variables_map::operator[](std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const': first.cpp:(.text._ZNK5boost15program_options13variables_mapixERKSs[boost::program_options::variables_map::operator[](std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const]+0x14): undefined reference to `boost::program_options::abstract_variables_map::operator[](std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const' /tmp/cctMoqyr.o: In function `boost::program_options::variables_map::~variables_map()': first.cpp:(.text._ZN5boost15program_options13variables_mapD1Ev[boost::program_options::variables_map::~variables_map()]+0xd): undefined reference to `vtable for boost::program_options::variables_map' /tmp/cctMoqyr.o: In function `boost::program_options::basic_command_line_parser<char>::basic_command_line_parser(int, char const* const*)': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcEC1EiPKPKc[boost::program_options::basic_command_line_parser<char>::basic_command_line_parser(int, char const* const*)]+0x6b): undefined reference to `boost::program_options::detail::cmdline::cmdline(std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&)' /tmp/cctMoqyr.o: In function `boost::program_options::basic_command_line_parser<char>::options(boost::program_options::options_description const&)': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE7optionsERKNS0_19options_descriptionE[boost::program_options::basic_command_line_parser<char>::options(boost::program_options::options_description const&)]+0x14): undefined reference to `boost::program_options::detail::cmdline::set_options_description(boost::program_options::options_description const&)' /tmp/cctMoqyr.o: In function `boost::program_options::basic_command_line_parser<char>::style(int)': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE5styleEi[boost::program_options::basic_command_line_parser<char>::style(int)]+0x14): undefined reference to `boost::program_options::detail::cmdline::style(int)' /tmp/cctMoqyr.o: In function `boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&>)': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE12extra_parserENS_9function1ISt4pairISsSsERKSsEE[boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&>)]+0x28): undefined reference to `boost::program_options::detail::cmdline::set_additional_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&>)' /tmp/cctMoqyr.o: In function `boost::program_options::basic_command_line_parser<char>::run()': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE3runEv[boost::program_options::basic_command_line_parser<char>::run()]+0x12): undefined reference to `boost::program_options::detail::cmdline::get_canonical_option_prefix()' first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE3runEv[boost::program_options::basic_command_line_parser<char>::run()]+0x3d): undefined reference to `boost::program_options::detail::cmdline::run()' /tmp/cctMoqyr.o: In function `std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > boost::program_options::to_internal<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&)': first.cpp:(.text._ZN5boost15program_options11to_internalISsEESt6vectorISsSaISsEERKS2_IT_SaIS5_EE[std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > boost::program_options::to_internal<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&)]+0x3c): undefined reference to `boost::program_options::to_internal(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost15program_options11typed_valueIdcEE[vtable for boost::program_options::typed_value<double, char>]+0x1c): undefined reference to `boost::program_options::value_semantic_codecvt_helper<char>::parse(boost::any&, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, bool) const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost15program_options20invalid_option_valueE[vtable for boost::program_options::invalid_option_value]+0x10): undefined reference to `boost::program_options::error_with_option_name::what() const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost15program_options20invalid_option_valueE[vtable for boost::program_options::invalid_option_value]+0x18): undefined reference to `boost::program_options::error_with_option_name::substitute_placeholders(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost15program_options16validation_errorE[vtable for boost::program_options::validation_error]+0x10): undefined reference to `boost::program_options::error_with_option_name::what() const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost15program_options16validation_errorE[vtable for boost::program_options::validation_error]+0x18): undefined reference to `boost::program_options::error_with_option_name::substitute_placeholders(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const' /tmp/cctMoqyr.o:(.rodata._ZTIN5boost15program_options11typed_valueIdcEE[typeinfo for boost::program_options::typed_value<double, char>]+0x10): undefined reference to `typeinfo for boost::program_options::value_semantic_codecvt_helper<char>' /tmp/cctMoqyr.o:(.rodata._ZTIN5boost15program_options16validation_errorE[typeinfo for boost::program_options::validation_error]+0x8): undefined reference to `typeinfo for boost::program_options::error_with_option_name' /tmp/cctMoqyr.o: In function `boost::program_options::typed_value<double, char>::name() const': first.cpp:(.text._ZNK5boost15program_options11typed_valueIdcE4nameEv[boost::program_options::typed_value<double, char>::name() const]+0x1f): undefined reference to `boost::program_options::arg' /tmp/cctMoqyr.o: In function `void boost::program_options::validate<double, char>(boost::any&, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, double*, long)': first.cpp:(.text._ZN5boost15program_options8validateIdcEEvRNS_3anyERKSt6vectorISbIT0_St11char_traitsIS5_ESaIS5_EESaIS9_EEPT_l[void boost::program_options::validate<double, char>(boost::any&, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, double*, long)]+0xf): undefined reference to `boost::program_options::validators::check_first_occurrence(boost::any const&)' first.cpp:(.text._ZN5boost15program_options8validateIdcEEvRNS_3anyERKSt6vectorISbIT0_St11char_traitsIS5_ESaIS5_EESaIS9_EEPT_l[void boost::program_options::validate<double, char>(boost::any&, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, double*, long)]+0x92): undefined reference to `boost::program_options::invalid_option_value::invalid_option_value(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /tmp/cctMoqyr.o: In function `boost::program_options::error_with_option_name::error_with_option_name(boost::program_options::error_with_option_name const&)': first.cpp:(.text._ZN5boost15program_options22error_with_option_nameC2ERKS1_[boost::program_options::error_with_option_name::error_with_option_name(boost::program_options::error_with_option_name const&)]+0x1f): undefined reference to `vtable for boost::program_options::error_with_option_name' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_15program_options16validation_errorEEEEE[vtable for boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::validation_error> >]+0x14): undefined reference to `boost::program_options::error_with_option_name::what() const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_15program_options16validation_errorEEEEE[vtable for boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::validation_error> >]+0x1c): undefined reference to `boost::program_options::error_with_option_name::substitute_placeholders(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail19error_info_injectorINS_15program_options16validation_errorEEE[vtable for boost::exception_detail::error_info_injector<boost::program_options::validation_error>]+0x10): undefined reference to `boost::program_options::error_with_option_name::what() const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail19error_info_injectorINS_15program_options16validation_errorEEE[vtable for boost::exception_detail::error_info_injector<boost::program_options::validation_error>]+0x18): undefined reference to `boost::program_options::error_with_option_name::substitute_placeholders(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_15program_options20invalid_option_valueEEEEE[vtable for boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::invalid_option_value> >]+0x14): undefined reference to `boost::program_options::error_with_option_name::what() const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_15program_options20invalid_option_valueEEEEE[vtable for boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::invalid_option_value> >]+0x1c): undefined reference to `boost::program_options::error_with_option_name::substitute_placeholders(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail19error_info_injectorINS_15program_options20invalid_option_valueEEE[vtable for boost::exception_detail::error_info_injector<boost::program_options::invalid_option_value>]+0x10): undefined reference to `boost::program_options::error_with_option_name::what() const' /tmp/cctMoqyr.o:(.rodata._ZTVN5boost16exception_detail19error_info_injectorINS_15program_options20invalid_option_valueEEE[vtable for boost::exception_detail::error_info_injector<boost::program_options::invalid_option_value>]+0x18): undefined reference to `boost::program_options::error_with_option_name::substitute_placeholders(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const' collect2: ld returned 1 exit status ---------------------- B. Clang error. I tried using clang instead with this command: clang first.cpp -o first -L/usr/local/lib/libboost_program_options.so and this is the error I get: In file included from first.cpp:9: In file included from /usr/local/include/boost/program_options.hpp:15: In file included from /usr/local/include/boost/program_options/options_description.hpp:13: In file included from /usr/local/include/boost/program_options/value_semantic.hpp:14: In file included from /usr/local/include/boost/lexical_cast.hpp:151: /usr/include/c++/4.4/cmath:518:14: error: cannot compile this builtin function yet return __builtin_isinf(__type(__f)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 diagnostic generated. ---------------------------- How can this be fixed?

2 1

[fusion] filter_if at run-time???
by Jeff Flinn 12 Mar '13

12 Mar '13

I've got a fusion set say: set<int, optional<double>, bool> s(...) I'd like to filter out empty optional<double> values when streaming out: std::cout << s; so for s(1, 2.0, true) ==> (1,2.0,true) and for s(3, optional<double>(), false) ==> (2,false) filter_if's predicate is an a Metafunction returning mpl::bool_ so it looks to me like this won't support run time? Is there another facility that would achieve the above? Thanks, Jeff

2 2

Compiled Boost with MPI
by julien.plu＠redaction-developpez.com 12 Mar '13

12 Mar '13

Hi, For my project I saw today that I needed MPI too. So I installed MPICH2 and Changed my < user-config.jam > file like that : import toolset : using ; using python : 2.7 : "C:/Python273" : "C:/Python273/include" : "C:/Python273/libs" ; using mpi : : <find-static-library>mpi <library-path>"C:/librairies/MPICH2-3.0.2/lib" <include>"C:/librairies/MPICH2-3.0.2/include" : "\"C:\\librairies\\MPICH2-3.0.2\\bin\\mpiexec\"" ; So I compile Boost with this command line : b2 toolset=gcc --j4 --layout=system release --prefix=C:\librairies\boost-1.53.0 --user-config=user-config.jam install And the error is in the out.txt file in attachment. Anyone know what's happenned ? Thanks in advance. Julien.

5 14

[geometry] Documentation error regarding geographical coordinate system?
by Jason 12 Mar '13

12 Mar '13

In the "Quick Start" section of the Boost.Geometry documentation, there is the following note under the "Non-Cartesian" header: Boost.Geometry supports a geographical coordinate system, but that is in an extension and not released in the current Boost release. boost::geometry::cs::geographic does seem to be in the v1.53 release. Is this just a remnant from legacy documentation, or are there some gotchas to be expected with the geographic coordinate system support? Jason -- View this message in context: http://boost.2283326.n4.nabble.com/geometry-Documentation-error-regarding-g… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

Meeting C++ 2013 - Call for Papers
by Jens Weller 12 Mar '13

12 Mar '13

Hello C++ & boost Community! Today, the 2nd Edition of the Meeting C++ conference has been announced! We will meet in Düsseldorf again at the 2nd November Weekend for two days full of C++! Call for Papers: http://www.meetingcpp.com/index.php/newsreader/items/call-for-papers-124.ht… Announcement with further Details on the conference: http://www.meetingcpp.com/index.php/newsreader/items/meeting-cpp-2013-annou… Talks about boost, C++11/14 are very welcome to the conference! kind regards, Jens Weller

1 0

Boost.Interprocess accessing an unordered_map in shared memory.
by lazylabs＠gmail.com 12 Mar '13

12 Mar '13

Hi, I am trying to create a unordered_map in shared memory using Boost Interprocess library. Here, is the code, which I'm trying to use (taking examples from Boost Interprocess documentation): #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <functional> #include <boost/functional/hash.hpp> #include <boost/unordered_map.hpp> #include <iostream> #include <string> #include <boost/interprocess/containers/string.hpp> namespace bipc = boost::interprocess; typedef bipc::allocator<char, bipc::managed_shared_memory::segment_manager> CharAllocator; typedef bipc::basic_string<char, std::char_traits<char>, CharAllocator> ShmemString; struct Person { int age; ShmemString name; double salary; Person(int i, double sal, const char* s, const char_allocator& a) : age(i), name(s, a), salary(sal) { } void print() {} } typedef ShmemString KeyType; typedef Person MappedType; typedef std::pair< KeyType, MappedType > MapPersonType; typedef bipc::allocator< MapPersonType, bipc::managed_shared_memory::segment_manager > ShMemAllocator; typedef boost::unordered_map< KeyType, MappedType, boost::hash<KeyType>, std::equal_to<KeyType>, ShMemAllocator > PersonMap; In the main reader program, I create a map in the shared memory and I insert an object in this map: int main() { bipc::managed_shared_memory segment(bipc::create_only, "MySharedMemory", 65536); PersonMap *persons = segment.construct<PersonMap>("MyHashMap") ( 3, boost::hash<ShmemString>(), std::equal_to<ShmemString>() , segment.get_allocator<MapPersonType>()); char_allocator alloc(segment.get_allocator<char>()); Person p1(20, 10000, "ABC", alloc); persons->insert(MapPersonType(ShmemString("Person1", alloc), p1)); } However, when I am trying to access the map in the reader program, I need to use a syntax like persons->at(ShmemString("H", segment.get_allocator<char>())).print(); However, I would prefer to do this with a std::string, which results in compilation errors: persons->at(std::string("H")).print(); Is it possible to write the above statement, i.e. accessing the map allocated in shared memory with std::string? Thanks.

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Using SSL
by ustulation 11 Mar '13

11 Mar '13

Hello. this will be the first time i'll be writing an SSL and am using boost::asio::ssl. I've gone through the articles over the net and somewhat understand how ssl works. I've created 3 files at server end as of now: privateKey.pem, unsignedCertificate.csr and signedCertificate.pem. I used the server's privateKey.pem to sign the certificate (hence the generated 3rd file). Hence Server itself is a Certification Authority in this case (CA). Now what i understand from theory is: <1> During handshake client will request server's certificate. <2> on reception the client must verify if the ceritficate is signed by the mentioned trusted Certification Authority (CA) in the certificate. Since CA will have used a private key to sign the certificate client will need CA's public key stored somewhere on its machine. Use that public key file to verify that mentioned CA did indeed sign it. <3> if it is, then verify the certificate as a whole. In my case, the server had used it's own private key to self-sign the certificate. questions: <1> if CA was one of the trusted third parties the O.S would have stored it's public key in default locations. In that case i guess all i needed was ssl::context::set_default_verify_paths() and boost would have used all files there to match against the CA and use its public key. In this case however i need Server's public key file. Am i right? How do i get that (server's public key)? Do i use one of the 3 files above at the client end too? Is it load_verify_file("..") that i need to call pointing to server's public key? <2> context::set_verify_callback : does this get called during handshake? The handler must return bool. Suppose i return false, who will check it and what will it do? What i am guessing is: handshake -> blocks and runs a pre-verification test -> calls the supplied handler -> if handler returns true, handshake is successful otherwise either the handshake throws or fills the error code with non-zero value depending on what flavour of handshake(...) was called. Is this correct? <3> if i use ssl::rfc2818_verification("hostname") as verify_callback handler, what do i pass in place of hostname if there is no hostname (ie., i only know the server ip address). <4> do i have to use chain of files in this case? Because the server would just send one certificate file - the one that is signed right? -- View this message in context: http://boost.2283326.n4.nabble.com/Using-SSL-tp4644012.html Sent from the Boost - Users mailing list archive at Nabble.com.

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