June 2009 - Boost-users - lists.boost.org

Re: [Boost-users] [ptr_container] ptr_map and MinGW: "a declaration of assert must be available", even with cassert included
by philipp_muenzel＠web.de 18 Jun '09

18 Jun '09

Hi, the error originates from various headers that ptr_map includes. This is the whole output from gcc, perhaps it helps: g++ -c -g -Wall -fno-exceptions -fno-rtti -I"c:\boost_1_39_0" - I"." -o release\datacontainer.o datacontainer. cpp In file included from c:/boost_1_39_0/boost/scoped_array.hpp:14, from c:/boost_1_39_0/boost/ptr_container/detail/scoped_deleter. hpp:21, from c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_ container.hpp:21, from c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr _container.hpp:20, from c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:20 , from c:/boost_1_39_0/boost/ptr_container/ptr_map.hpp:20, from datacontainer.h:29, from datacontainer.cpp:21: c:/boost_1_39_0/boost/smart_ptr/scoped_array.hpp: In member function `T& boost:: scoped_array<T>::operator[](ptrdiff_t) const': c:/boost_1_39_0/boost/smart_ptr/scoped_array.hpp:80: error: there are no argumen ts to `assert' that depend on a template parameter, so a declaration of `assert' must be available c:/boost_1_39_0/boost/smart_ptr/scoped_array.hpp:80: error: (if you use `-fpermi ssive', G++ will accept your code, but allowing the use of an undeclared name is deprecated) In file included from c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_ container.hpp:21, from c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr _container.hpp:20, from c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:20 , from c:/boost_1_39_0/boost/ptr_container/ptr_map.hpp:20, from datacontainer.h:29, from datacontainer.cpp:21: c:/boost_1_39_0/boost/ptr_container/detail/scoped_deleter.hpp: In constructor `b oost::ptr_container_detail::scoped_deleter<T, CloneAllocator>::scoped_deleter(si ze_t)': c:/boost_1_39_0/boost/ptr_container/detail/scoped_deleter.hpp:47: error: there a re no arguments to `assert' that depend on a template parameter, so a declaratio n of `assert' must be available c:/boost_1_39_0/boost/ptr_container/detail/scoped_deleter.hpp: In constructor `b oost::ptr_container_detail::scoped_deleter<T, CloneAllocator>::scoped_deleter(si ze_t, const T&)': c:/boost_1_39_0/boost/ptr_container/detail/scoped_deleter.hpp:58: error: there a re no arguments to `assert' that depend on a template parameter, so a declaratio n of `assert' must be available c:/boost_1_39_0/boost/ptr_container/detail/scoped_deleter.hpp: In constructor `b oost::ptr_container_detail::scoped_deleter<T, CloneAllocator>::scoped_deleter(In putIterator, InputIterator)': c:/boost_1_39_0/boost/ptr_container/detail/scoped_deleter.hpp:71: error: there a re no arguments to `assert' that depend on a template parameter, so a declaratio n of `assert' must be available In file included from c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_ container.hpp:24, from c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr _container.hpp:20, from c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:20 , from c:/boost_1_39_0/boost/ptr_container/ptr_map.hpp:20, from datacontainer.h:29, from datacontainer.cpp:21: c:/boost_1_39_0/boost/ptr_container/clone_allocator.hpp: In function `T* boost:: new_clone(const T&)': c:/boost_1_39_0/boost/ptr_container/clone_allocator.hpp:35: error: cannot use ty peid with -fno-rtti c:/boost_1_39_0/boost/ptr_container/clone_allocator.hpp:35: error: cannot use ty peid with -fno-rtti c:/boost_1_39_0/boost/ptr_container/clone_allocator.hpp:35: error: there are no arguments to `assert' that depend on a template parameter, so a declaration of ` assert' must be available In file included from c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr _container.hpp:20, from c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:20 , from c:/boost_1_39_0/boost/ptr_container/ptr_map.hpp:20, from datacontainer.h:29, from datacontainer.cpp:21: c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_container.hpp: In stat ic member function `static typename Config::value_type* boost::ptr_container_det ail::reversible_ptr_container<Config, CloneAllocator>::null_clone_allocator<allo w_null_values>::allocate_clone(const typename Config::value_type*)': c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_container.hpp:111: err or: cannot use typeid with -fno-rtti c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_container.hpp:111: err or: cannot use typeid with -fno-rtti c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_container.hpp:111: err or: there are no arguments to `assert' that depend on a template parameter, so a declaration of `assert' must be available In file included from c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:20 , from c:/boost_1_39_0/boost/ptr_container/ptr_map.hpp:20, from datacontainer.h:29, from datacontainer.cpp:21: c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp: In mem ber function `void boost::ptr_container_detail::associative_ptr_container<Config , CloneAllocator>::multi_transfer(typename AssociatePtrCont::iterator, Associate PtrCont&)': c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp:196: er ror: there are no arguments to `assert' that depend on a template parameter, so a declaration of `assert' must be available c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp: In mem ber function `typename boost::ptr_container_detail::reversible_ptr_container<Con fig, CloneAllocator>::size_type boost::ptr_container_detail::associative_ptr_con tainer<Config, CloneAllocator>::multi_transfer(typename AssociatePtrCont::iterat or, typename AssociatePtrCont::iterator, AssociatePtrCont&)': c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp:208: er ror: there are no arguments to `assert' that depend on a template parameter, so a declaration of `assert' must be available c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp: In mem ber function `bool boost::ptr_container_detail::associative_ptr_container<Config , CloneAllocator>::single_transfer(typename AssociatePtrCont::iterator, Associat ePtrCont&)': c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp:229: er ror: there are no arguments to `assert' that depend on a template parameter, so a declaration of `assert' must be available c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp: In mem ber function `typename boost::ptr_container_detail::reversible_ptr_container<Con fig, CloneAllocator>::size_type boost::ptr_container_detail::associative_ptr_con tainer<Config, CloneAllocator>::single_transfer(typename AssociatePtrCont::itera tor, typename AssociatePtrCont::iterator, AssociatePtrCont&)': c:/boost_1_39_0/boost/ptr_container/detail/associative_ptr_container.hpp:245: er ror: there are no arguments to `assert' that depend on a template parameter, so a declaration of `assert' must be available In file included from c:/boost_1_39_0/boost/ptr_container/ptr_map.hpp:20, from datacontainer.h:29, from datacontainer.cpp:21: c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp: In member function `typ ename boost::ptr_container_detail::associative_ptr_container<boost::ptr_containe r_detail::map_config<T, VoidPtrMap, Ordered>, CloneAllocator>::const_reference b oost::ptr_container_detail::ptr_map_adapter_base<T, VoidPtrMap, CloneAllocator, Ordered>::lookup(const typename boost::ptr_container_detail::associative_ptr_con tainer<boost::ptr_container_detail::map_config<T, VoidPtrMap, Ordered>, CloneAll ocator>::key_type&) const': c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:176: error: there are no arguments to `assert' that depend on a template parameter, so a declaration of `assert' must be available datacontainer.cpp: In member function `bool DataContainer::addRequestedData(uint 32_t, const std::string&)': datacontainer.cpp:91: warning: comparison between signed and unsigned integer ex pressions c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_container.hpp: In stat ic member function `static void boost::ptr_container_detail::reversible_ptr_cont ainer<Config, CloneAllocator>::enforce_null_policy(const typename Config::value_ type*, const char*) [with Config = boost::ptr_container_detail::map_config<ICanD ataToSend, std::map<uint32_t, void*, std::less<uint32_t>, std::allocator<std::pa ir<const uint32_t, void*> > >, true>, CloneAllocator = boost::heap_clone_alloca tor]': c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:524: instantiated from `std::pair<typename boost::ptr_container_detail::ptr_map_adapter_base<T, VoidPt rMap, CloneAllocator, Ordered>::iterator, bool> boost::ptr_map_adapter<T, VoidPt rMap, CloneAllocator, Ordered>::insert_impl(const typename boost::ptr_container_ detail::ptr_map_adapter_base<T, VoidPtrMap, CloneAllocator, Ordered>::key_type&, typename boost::ptr_container_detail::ptr_map_adapter_base<T, VoidPtrMap, Clone Allocator, Ordered>::mapped_type) [with T = ICanDataToSend, VoidPtrMap = std::ma p<uint32_t, void*, std::less<uint32_t>, std::allocator<std::pair<const uint32_t, void*> > >, CloneAllocator = boost::heap_clone_allocator, bool Ordered = true] ' c:/boost_1_39_0/boost/ptr_container/ptr_map_adapter.hpp:550: instantiated from `std::pair<typename boost::ptr_container_detail::ptr_map_adapter_base<T, VoidPt rMap, CloneAllocator, Ordered>::iterator, bool> boost::ptr_map_adapter<T, VoidPt rMap, CloneAllocator, Ordered>::insert(typename boost::ptr_container_detail::ptr _map_adapter_base<T, VoidPtrMap, CloneAllocator, Ordered>::key_type&, typename b oost::ptr_container_detail::ptr_map_adapter_base<T, VoidPtrMap, CloneAllocator, Ordered>::mapped_type) [with T = ICanDataToSend, VoidPtrMap = std::map<uint32_t, void*, std::less<uint32_t>, std::allocator<std::pair<const uint32_t, void*> > > , CloneAllocator = boost::heap_clone_allocator, bool Ordered = true]' datacontainer.cpp:124: instantiated from here c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_container.hpp:264: err or: `assert' was not declared in this scope c:/boost_1_39_0/boost/ptr_container/detail/reversible_ptr_container.hpp:264: war ning: unused variable 'assert' mingw32-make[1]: *** [release/datacontainer.o] Error 1 > -----Ursprüngliche Nachricht----- > philipp_muenzel(a)web.de skrev: > > Hello, > > > > I'm using boost::ptr_map successfully on Linux, compiling with gcc 4.3.2. > > However, now i tried the same code on Windows XP, using MinGW with gcc 3.4.5 i get the following error: > > "error: there are no arguments to 'assert' that depend on a template parameter, so a declaration of 'assert' must be available". > > > > I had exactly the same error on Linux, there i put a #include <cassert> before the #include to boost::ptr_map and everything worked. > > But on windows, i tried #include <cassert> and #include <assert.h>, also a > > #include <cassert> > > #ifndef assert > > #define assert assert > > #endif > > in case something was messing with the name. > > I tried version 1.39 and 1.37 on windows and the result is the same. > > > > I also carefully inspected the headers i also include, suspecting some might #define an include-guard that confuses with assert. > > > > No luck yet and I'm out of ideas now. > > > > Any ideas are greatly appreciated. > > Hm. I have no idea, actually. I tried to grep for assert in the source > without any luck :-( > > Are the ptr container headers the only headers that you include? > > -Thorsten > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > ___________________________________________________________________ WEB.DE FreeDSL Komplettanschluss mit DSL 6.000 Flatrate und Telefonanschluss für 17,95 Euro/mtl.! http://produkte.web.de/go/02/

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[ptr_container] ptr_map and MinGW: "a declaration of assert must be available", even with cassert included
by philipp_muenzel＠web.de 18 Jun '09

18 Jun '09

Hello, I'm using boost::ptr_map successfully on Linux, compiling with gcc 4.3.2. However, now i tried the same code on Windows XP, using MinGW with gcc 3.4.5 i get the following error: "error: there are no arguments to 'assert' that depend on a template parameter, so a declaration of 'assert' must be available". I had exactly the same error on Linux, there i put a #include <cassert> before the #include to boost::ptr_map and everything worked. But on windows, i tried #include <cassert> and #include <assert.h>, also a #include <cassert> #ifndef assert #define assert assert #endif in case something was messing with the name. I tried version 1.39 and 1.37 on windows and the result is the same. I also carefully inspected the headers i also include, suspecting some might #define an include-guard that confuses with assert. No luck yet and I'm out of ideas now. Any ideas are greatly appreciated. Regards, Philipp ____________________________________________________________ Text: GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de

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Boost: Regex - XML
by Etienne Philip Pretorius 18 Jun '09

18 Jun '09

Just a general question, Could one use Boost.Regex to build a Well-Formed and Validating XML parser whose view is iterators to elements inside the XML document? In other words, create a class that acts like an XML parser so that you may derive from it to say create a XMPP class? Etienne

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BOOST_FOREACH question
by Zachary Turner 18 Jun '09

18 Jun '09

Suppose I've got a concrete instance C of some class, and a pair of iterators X and Y representing a range [X, Y). I want to do the following: int a, b, c; while (X != Y) { C.foo(*X, a, b, c); ++X; } I can type it out like that, but actually X and Y are zip_iterators, and it's hard for me to figure out how to parameterize the zip_iterator to instantiate it. I tried the following: class EncoderService { boost::asio::io_service work_io_service_; void async_encode(std::vector<const_buffer> inputs, std::vector<mutable_buffer> outputs) { BOOST_ASSERT(s.size() == t.size()); std::for_each( boost::make_zip_iterator(boost::make_tuple(inputs.begin(), outputs.begin())), boost::make_zip_iterator(boost::make_tuple(inputs.end(), outputs.end())), boost::bind( &boost::asio::io_service::post, &work_io_service_, boost::bind( &EncoderService::encode_handler, this))); } void encode_handler(const boost::tuple<const_buffer, mutable_buffer>& buffers) { } }; If I do this I get tons of errors. I'm probably just doing something stupid. Even still the for_each is already complicated and kind of hard to read, I feel like there should be a one or two-liner to do this :( the io_service::post() function simply calls encode_handler() on another thread. I'm thinking it might just be easier to walk each sequence manually, but at some point I was hoping to templatize the async_encode() function rather than have it take vectors.

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[Q] help serializing a multiset of shared ptrs
by V S P 17 Jun '09

17 Jun '09

Hello, I am sure I am not doing things quite right in serializing my multiset, however I could not 'connect the dots' in the serialize documentation between serializing shared pointers and containers. Therefore, asking for help. I created a complete compilable example, that I am attaching below and the created output file. The program crashes on the last line when I am trying to load the data back in. Any help is greatly appreciated, Vlad -------------- prog start ---------------- #include <iostream> #include <fstream> #include <ostream> #include <ctime> #include <cstdlib> #include <set> #include <algorithm> #include <boost/archive/tmpdir.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/list.hpp> #include <boost/serialization/assume_abstract.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/nvp.hpp> #include <boost/archive/tmpdir.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/lexical_cast.hpp> using namespace std; using namespace boost; template <typename TRow, typename TContainer=std::multiset< shared_ptr<TRow> > > struct cactivetable_t: public TContainer, private boost::noncopyable { template <typename Archive> void serialize (Archive& ar, const unsigned int version) { for (TContainer::const_iterator it=begin(); it!=end();it++) { (*it)->myserialize(ar,version); } } }; struct tRow { int a; string b; template <typename Archive> void myserialize (Archive& ar, const unsigned int version) { ar&boost::serialization::make_nvp("a", a); ar&boost::serialization::make_nvp("b", b); } }; struct randrow { shared_ptr<tRow> operator()(void) { shared_ptr<tRow> p(new tRow); p->a=rand()%100; p->b=lexical_cast<string>(p->a); return p; } }; void main (void) { cactivetable_t<tRow> mytb; shared_ptr<tRow> tmpP(new tRow); for (size_t i=0;i<10;i++) { /*note for multiset we can insert the same thing many times */ mytb.insert(tmpP); } randrow rw; generate(mytb.begin(),mytb.end(),rw); // make an archive { ofstream ofs("xyz.sxml"); assert(ofs.good()); boost::archive::xml_oarchive oa(ofs); oa<<BOOST_SERIALIZATION_NVP(mytb); }//scope to close file cout<<"finished serializing, now lets try to read back"<<endl; mytb.clear(); { // open the archive std::ifstream ifs("xyz.sxml"); assert(ifs.good()); boost::archive::xml_iarchive ia(ifs); // restore the schedule from the archive ia >> BOOST_SERIALIZATION_NVP(mytb); } cout<<"after restore tb size is: "<<mytb.size()<<endl; } -------------- prog end ------------------- -- archive xyz.sxml XML start ---- <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <!DOCTYPE boost_serialization> <boost_serialization signature="serialization::archive" version="5"> <mytb class_id="0" tracking_level="0" version="0"> <a>41</a> 41 <a>67</a> 67 <a>34</a> 34 <a>0</a> 0 <a>69</a> 69 <a>24</a> 24 <a>78</a> 78 <a>58</a> 58 <a>62</a> 62 <a>64</a> 64 </mytb> </boost_serialization> --- archive XML end ---- -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - Access all of your messages and folders wherever you are

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asio: serial ports and timeouts
by KessiMC 17 Jun '09

17 Jun '09

Hi again I was playing around with asio a bit, creating the following class: AsioPlayground::AsioPlayground() : maxCharDelay(seconds(10)), charTimeout(io, maxCharDelay), port(io, "COM2") { port.set_option(serial_port_base::baud_rate(9600)); port.set_option(serial_port_base::character_size(7)); port.set_option(serial_port_base::flow_control(serial_port_base::flow_control::none)); port.set_option(serial_port_base::parity(serial_port_base::parity::even)); port.set_option(serial_port_base::stop_bits(serial_port_base::stop_bits::one)); } AsioPlayground::~AsioPlayground() { } template<> void AsioPlayground::write<string>(const string &value) { boost::asio::write(port, buffer(value, value.size())); } template<> void AsioPlayground::write<char>(const char &c) { boost::asio::write(port, buffer(&c, 1)); } template<> char AsioPlayground::read<char>() { function<void(const error_code &)> onTimeout = bind(&AsioPlayground::onTimeout, this, _1); charTimeout.async_wait(onTimeout); function<void(const error_code &, size_t)> onSuccess = bind(&AsioPlayground::onSuccess, this, _1, _2); char input = '\0'; async_read(port, buffer(&input, 1), onSuccess); error_code ec; io.run(ec); return input; } string AsioPlayground::read(int numberOfCharacters) { string input; for (int i = 0; i < numberOfCharacters; ++i) { input.push_back(read<char> ()); } return input; } void AsioPlayground::onSuccess(const error_code &ec, size_t size) { charTimeout.cancel(); } void AsioPlayground::onTimeout(const error_code &ec) { if (ec != error::operation_aborted) { throw InterfaceTimeoutException("No response"); } } int AsioPlayground::main(const vector<string> &args) { AsioPlayground play; play.write<string> ("/?12345678!\r\n"); try { cout << "Reply: " << play.read(10) << endl; } catch (const InterfaceTimeoutException &ex) { cout << ex.what() << endl; } return 0; } Executing the main function should have an expected behaviour of writing the string to the other party, and reading at least 10 characters or failing with a timeout exception. The timeout is meant to work as a character delay, allowing a maximum of 10 seconds between each transmitted character before failing. The writing part works A-ok. The reading throws the expected exception if no characters are transmitted by the oppositing device. However, if I transmit 9 characters from the device, these characters are displayed, appended by a '\0' character (or whichever character I choose as default in read<char>()). io.run() seems to return immediately, not even waiting for any characters to be transmitted. Adding completion_conditions to async_read(), like transfer_all() or transfer_at_least(1) did not do the trick, either. What is going wrong here? Thanks for any suggestions and greeetz Pascal -- View this message in context: http://www.nabble.com/asio%3A-serial-ports-and-timeouts-tp24073127p24073127… Sent from the Boost - Users mailing list archive at Nabble.com.

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Boost Trac/Subversion upgrade this Friday
by Doug Gregor 17 Jun '09

17 Jun '09

The Boost Trac and Subversion repository will be offline for a few hours this Friday, June 19th, while we upgrade to a new version of Trac. Mailing lists will not be affected. Here is the approximate down-time: Date: Friday June 19, 2009 Time: - 11:00am-2:00pm Pacific US time - 12:00pm-3:00pm Mountain US time - 1:00pm-4:00pm Central US time - 2:00pm-5:00am Eastern US time - 6:00pm-9:00pm GMT Cheers, - Doug

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Re: [Boost-users] [iostreams] filtering_istream not working as intended..
by mmocny 17 Jun '09

17 Jun '09

Hello all, I am running into some odd "quirks" of the filtering_istream in the boost::iostreams library. Perhaps I am just using it wrong, but all code compiles, and does _almost_ what I would expect it to. Example Code: #include <boost/iostreams/tee.hpp> #include <boost/iostreams/invert.hpp> #include <boost/iostreams/device/file.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <iostream> int main() { boost::iostreams::file log_file("sample.txt", std::ios::trunc); boost::iostreams::filtering_istream in; in.push( boost::iostreams::invert(boost::iostreams::tee(log_file)) ) /* this part is optional */ in.push( std::cin ); std::string s; int i; /* step 1 */ getline(std::cin,s); /* note: std::cin as istream passed to getline */ std::cin >> i; std::cin.ignore( std::numeric_limits<std::streamsize>::max(), '\n' ); std::cout << s << std::endl <> i; std::cin.ignore( std::numeric_limits<std::streamsize>::max(), '\n' ); std::cout << s << std::endl << i << std::endl; /* I would expect step 1 and step 2 to behave exactly the same (except for the loggin) */ } As documented, I would expect the two input blocks to exhibit the exact same behavior. Unfortunately, on my platform anyway ( gcc 4.3.3 on 64 bit linux ) - and verified by another user ( also on linux 64 bit, gcc 4.4 ) - that the two code blocks not only differ, but differ in odd ways. The filtering_istream blocks on input, and will not resume until *4* EOF characters are sent. If I remove the invert(tee(log_file)) only *2* EOF need to be sent. First off, I do not know why it is blocking (perhaps this is expected from a filtering_istream which expects to read the entire stream to EOF). I have not found this documented anywhere. Either way, the fact that multiple EOF's need to be sent, and the fact that that number differs depending on the pipeline, leads me to think there is either a bug or I am not using something as intended. Thanks for any help! -Michal p.s. My requirements are only to create an istream which sends what is read from standard input to a log file, while still having the input available for processing by the application. Maybe can suggest another way to solve the problem?

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using Boost.Interprocess with different compilers
by Dominik Holler 17 Jun '09

17 Jun '09

Hi, is it possible to communicate between multiple programs using Boost.Interprocess, if the programs are compiled with different compilers e.g. MSVS 7.1 and MinGw gcc 3.4.5 ? regards Dominik Holler

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[variant] Efficiency
by Olivier Tournaire 17 Jun '09

17 Jun '09

Hi all, I need to store in a class an object which type is within a predefined set. As I would like to avoid the overhead of virtual functions, I am wondering if variant could help me. Moreover, I would like to know what is the runtime cost of using such a type (instead of base class pointers), and the cost of the apply_visitor. Hope you could help. Regards, Olivier

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