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

[boost] [program options] Recommended way to specify a list of strings
by Sanjit Jhala 01 Jan '10

01 Jan '10

Say I want to specify a list of servers via the boost program_options library. Something like: --total-servers N --server srv1 --server srv2 ... --server srvN How would I do this? It doesn't look like multitoken would work for this case, so would it be better for me to just have something like: --total-servers N --serverlist srv1 srv2 ... srvN and use a single string to store the serverlist and parse it myself? -Sanjit

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Boost unit test framework and the "system" system call under Linux.
by Avila Mathieu 31 Dec '09

31 Dec '09

Hello, I'm a bit new to Boost, so please don't throw rocks at me if this sounds stupid. I have a simple module that allows to wrap an external command execution using "system()". It returns a result that depends on the exit code. I want to unit test this with boost test, as I do for other modules. Unfortunately, it seems that the framework catches the signal of the child exit if it exits with a non-zero exit code. So that the unit test is aborted, which is not what I want. It seems the Execution Monitor is the solution to my problem. Is it ? How can I use it to prevent Boost from catching every signal ? Thanks in advance, -- Mathieu

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[boost::python] How can I link python library against certain version?
by blp330 31 Dec '09

31 Dec '09

Hi, I try to upgrade my boost from 1.36 to 1.41, but it will link against python26.lib. My own python version is 2.5, How can I tell boost to link with python25.lib? Thanks. -- View this message in context: http://old.nabble.com/-boost%3A%3Apython--How-can-I-link-python-library-aga… Sent from the Boost - Users mailing list archive at Nabble.com.

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[interprocess] mutex in shared memory, crash recovery
by Jerry Hicks 31 Dec '09

31 Dec '09

I know the correct answer is to avoid crashing while holding a mutex in shared memory ;-) But since I'm handing a system off to other developers I'd like to understand if there is a most correct way to 'scrub' a mutex in shared memory clean if a thread crashed while holding the mutex. Assume that at the point I would like to do this that there is only one thread attached to the shared memory and no possibility of any thread attempting to lock the (locked stagnant) mutex.

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How to use boost thread & asio library without exception
by n179911 31 Dec '09

31 Dec '09

Hi, I am using boost's thread and asio library: #include <boost/asio.hpp> #include <boost/thread.hpp> But when I compile it, I get this error: /media/data/bin/boost/include/boost/exception_ptr.hpp:11:2: error: #error This header requires exception handling to be enabled. In file included from /media/data/bin/boost/include/boost/asio/detail/winsock_init.hpp:22, /media/data/bin/boost/include/boost/function/function_base.hpp:386: error: cannot use typeid with -fno-rtti Is there a way to use boost's thread and asio library without exception and rtti? Thank you.

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Need help in setting up boost library in ubuntu 9.10
by n179911 31 Dec '09

31 Dec '09

I have compiled and installed my boost library in '/media/data/bin' in ubuntu 9.10. And I have setup the INCLUDE_PATH, LIBRARY_PATH env: $ echo $INCLUDE_PATH /media/data/bin/boost/include: $ echo $LIBRARY_PATH /media/data/bin/boost/lib: But when I compile the asio example, I get the following error: $ g++ blocking_tcp_echo_server.cpp blocking_tcp_echo_server.cpp:13:26: error: boost/bind.hpp: No such file or directory blocking_tcp_echo_server.cpp:14:31: error: boost/smart_ptr.hpp: No such file or directory blocking_tcp_echo_server.cpp:15:26: error: boost/asio.hpp: No such file or directory blocking_tcp_echo_server.cpp:16:28: error: boost/thread.hpp: No such file or directory blocking_tcp_echo_server.cpp:18: error: ‘boost’ has not been declared blocking_tcp_echo_server.cpp:22: error: ‘boost’ has not been declared blocking_tcp_echo_server.cpp:22: error: expected initializer before ‘<’ token blocking_tcp_echo_server.cpp:24: error: variable or field ‘session’ declared void blocking_tcp_echo_server.cpp:24: error: ‘socket_ptr’ was not declared in this sco $ g++ -I/media/data/bin/boost/include -L/media/data/bin/boost/lib blocking_tcp_echo_server.cpp /usr/bin/ld: /tmp/ccBXjXeh.o: in function server(boost::asio::io_service&, short):blocking_tcp_echo_server.cpp(.text+0x39e): error: undefined reference to 'boost::thread::~thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function server(boost::asio::io_service&, short):blocking_tcp_echo_server.cpp(.text+0x3c7): error: undefined reference to 'boost::thread::~thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function server(boost::asio::io_service&, short):blocking_tcp_echo_server.cpp(.text+0x3d8): error: undefined reference to 'boost::thread::~thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x5ea): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x5f4): error: undefined reference to 'boost::system::get_generic_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x5fe): error: undefined reference to 'boost::system::get_generic_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x608): error: undefined reference to 'boost::system::get_generic_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function __static_initialization_and_destruction_0(int, int):blocking_tcp_echo_server.cpp(.text+0x612): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::system::error_code::error_code():blocking_tcp_echo_server.cpp(.text._ZN5boost6system10error_codeC1Ev+0x10): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::error::get_system_category():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio5error19get_system_categoryEv+0x7): error: undefined reference to 'boost::system::get_system_category()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_thread::~posix_thread():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail12posix_threadD1Ev+0x1d): error: undefined reference to 'pthread_detach' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_thread::join():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail12posix_thread4joinEv+0x25): error: undefined reference to 'pthread_join' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data_base::thread_data_base():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail16thread_data_baseC2Ev+0x1b): error: undefined reference to 'vtable for boost::detail::thread_data_base' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::thread::thread<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >(boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > >, boost::disable_if<boost::is_convertible<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > >&, boost::detail::thread_move_t<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > > >, boost::thread::dummy*>::type):blocking_tcp_echo_server.cpp(.text._ZN5boost6threadC1INS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEEET_NS_10disable_ifINS_14is_convertibleIRSK_NS_6detail13thread_move_tISK_EEEEPNS0_5dummyEE4typeE+0x66): error: undefined reference to 'boost::thread::start_thread()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED1Ev+0x28): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED1Ev+0x42): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED0Ev+0x28): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >::~thread_data():blocking_tcp_echo_server.cpp(.text._ZN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEED0Ev+0x42): error: undefined reference to 'boost::detail::thread_data_base::~thread_data_base()' /usr/bin/ld: /tmp/ccBXjXeh.o: in function typeinfo for boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >), boost::_bi::list1<boost::_bi::value<boost::shared_ptr<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > > > >:blocking_tcp_echo_server.cpp(.rodata._ZTIN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvNS_10shared_ptrINS_4asio19basic_stream_socketINS5_2ip3tcpENS5_21stream_socket_serviceIS8_EEEEEEENS2_5list1INS2_5valueISC_EEEEEEEE+0x8): error: undefined reference to 'typeinfo for boost::detail::thread_data_base' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::~posix_tss_ptr():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEED2Ev+0xf): error: undefined reference to 'pthread_key_delete' /usr/bin/ld: /tmp/ccBXjXeh.o: in function boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::posix_tss_ptr():blocking_tcp_echo_server.cpp(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEEC2Ev+0x22): error: undefined reference to 'pthread_key_create' collect2: ld returned 1 exit status Thank you.

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Proto Help
by David Greene 31 Dec '09

31 Dec '09

I am resurrecting some ancient code written back before Proto was an official Boost library. Things have changed quite a bit since then so I need to port the code. The code was never complete in the first place but I think much of it still applies. In any case, my goal is to take a Proto expression tree and transform it into another kind of tree using custom classes. Essentially it's an IR translation problem. Let's take an add node for example. Here's what I have so far: struct Base { ... }; struct Add : Base { ... }; // Custom expression nodes. // Transform a two-operand node. template<typename NodeType, typename Dummy = boost::proto::callable> struct ConstructBinary : boost::proto::callable { typedef boost:shared_ptr<NodeType> result_type; result_type operator()(boost::shared_ptr<Base> left, boost::shared_ptr<Base> right) { return result_type(new NodeType(left, right)); } }; struct ConstructExpressionGrammar; struct AddRule : boost::proto::plus<ConstructExpressionGrammar, ConstructExpressionGrammar> {}; // Want to use switch because of the large expression space. struct ConstructExpressionGrammarCases { // The primary template matches nothing: template<typename Tag> struct case_ : proto::not_<_> {}; }; // Match and construct an Add tree. template<> struct ConstructExpressionGrammarCases::case_<proto::tag::plus> : boost::proto::when<AddRule, // ?? ConstructBinary<Add>( ConstructExpressionGrammmar( boost::proto::_left), ConstructExpressionGrammmar( boost::proto::_right))> {}; struct ConstructExpressionGrammar : boost::proto::switch_<ConstructExpressionGrammarCases> {}; That's the basic outline. I don't think this is correct, however. In the grammar rule when<>, I'm not sure I can make a nested function type like that. I'm trying to tell the grammar to match the children and transform them, passing them to the ConstructBinary transformation to build the Add subtree. Any help is greatly appreciated. Thanks! -Dave

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[lambda] Boost.Bind works, labmda bind fails to compile
by Igor R 30 Dec '09

30 Dec '09

Hello, Could someone please explain the following behavior: #include <boost/lambda/bind.hpp> #include <boost/bind.hpp> struct Functor { void operator()() const {} template<class T> void func(T t) {} }; int main() { Functor f; boost::lambda::bind(&Functor::func<Functor>, &f, f); // doesn't compile boost::bind(&Functor::func<Functor>, &f, f); // compiles well } Thanks!

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c++: boost::multi_array - initialize a multi_array
by Hannan Sadar 30 Dec '09

30 Dec '09

Hi all, i am trying to initialize all the elements in boost::multi_array type to zero, so far, with out success. At tried using std::fill for 1-dim boost::multi_array and it worked. Once i tried std:fill on 2-dim boost::multi_array it haven't worked any more. I saw boost have #include <boost/assign/std/vector.hpp> // for 'operator+=()' #include <boost/assert.hpp>; libraries but i don't know if this is the correct way to initialize a 2-dim multi_array. I would like to know how to initialize a boost::multi_array in an elegant way. here is an example code of my multi_array (it pass compilation, but return an error at run time): #include <iomanip> #include "boost/multi_array.hpp" #include <iostream> namespace vec { typedef boost::multi_array<unsigned int, 1> uint_1d_vec_t; typedef boost::multi_array<unsigned int, 2> uint_2d_vec_t; typedef uint_1d_vec_t::index index_1d_t; typedef uint_2d_vec_t::index index_2d_t; } int main( ) { unsigned int num_elements, num_bits, max_runs, m; num_bits = 12; max_runs = 5000; m = 2; num_elements = ( 1 << num_bits ); int kappa = 79; vec::uint_1d_vec_t foo( boost::extents[ static_cast< vec::index_1d_t >(num_elements) ] ); vec::uint_2d_vec_t boo( boost::extents[ static_cast< vec::index_2d_t >(num_elements) ][ static_cast< vec::index_2d_t >(kappa) ] ); std::fill( foo.begin() , foo.end() , 0); std::fill( boo.begin()->begin() , boo.end()->end() , 0); std::cout << "Done" << std::endl; return EXIT_SUCCESS; } any suggestion is welcome regards

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Fwd: [fusion] Using boost::mpl::fold with a fusion sequence
by Roberto Giménez 30 Dec '09

30 Dec '09

Hi. When I try to compile this: #include <boost/fusion/container/map.hpp> #include <boost/mpl/fold.hpp> int main(int argc, char** argv) { typedef boost::fusion::map < boost::fusion::pair<int, const char*>, boost::fusion::pair<long, char> > FuMap; FuMap fuMap("hello", 'w'); unsigned val = boost::mpl::fold < FuMap, boost::mpl::int_<0>, boost::mpl::next<boost::mpl::_1> >::type::value; } I get the following error: "...boost/mpl/begin_end.hpp", line 35: Error, nofieldfnd: apply is not a member of boost::mpl::begin_impl<boost::fusion::fusion_sequence_tag>. >From the fusion documentation: "Fusion provides full round compatibility with MPL. Fusion sequences are fully conforming MPL sequences and MPL sequences are fully compatible with Fusion. You can work with Fusion sequences on MPL if you wish to work solely on types." When I pass a boost::mpl::map it works. Any clues?

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