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connection timeout
by Gianni Ambrosio 09 Jul '11

09 Jul '11

Hi All, I use an async_connect() call in my tcp socket client implementation. It seems there is a timeout of about 15 seconds (in my case) so that after that time connect callback is executed passing an error. Is there a way to get or set that connection timeout? Regards Gianni

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Re: [Boost-users] [Asio] Crash on service delete
by Marat Abrarov 09 Jul '11

09 Jul '11

Hi, Indrek. > // m_socket was associated with m_service > m_socket->cancel(); > m_socket->shutdown( boost::asio::ip::tcp::socket::shutdown_both, ec ); > m_socket->close( ec ); > delete m_socket; > m_socket = NULL; > > // Delete work on the service > delete m_work; > m_work = NULL; > > // Stop the service > m_service->stop(); > > // Join the thread this service was running on > m_thread->interrupt(); > m_thread->join(); > delete m_thread; > m_thread = NULL; > > // Crashes here > delete m_service; > m_service = NULL; > > Here's what VC10 reported: > Access violation > camc.exe!boost::asio::detail::socket_ops::send(unsigned int s, const _WSABUF > * bufs, unsigned int count, int flags, boost::system::error_code & ec) Line > 876 + 0x24 bytes C++ > camc.exe!boost::asio::detail::socket_select_interrupter::interrupt() Line > 127 + 0x18 bytes C++ > camc.exe!boost::asio::detail::select_reactor::shutdown_service() Line 73 C++ > camc.exe!boost::asio::detail::service_registry::~service_registry() Line 42 > + 0xf bytes C++ > camc.exe!boost::asio::detail::service_registry::`scalar deleting > destructor'() + 0x16 bytes C++ > camc.exe!boost::asio::io_service::~io_service() Line 51 + 0x1f bytes C++ > camc.exe!boost::asio::io_service::`scalar deleting destructor'() + 0x16 > bytes C++ May be the source of your problem is located in yours async write completion handler (it is often so - see asio-users mailing list). It seems that your completion handler tries to use destroyed m_socket. Regards, Marat Abrarov.

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algorithm question
by Peter Foelsche 09 Jul '11

09 Jul '11

Dear All, I'm trying to get some objects sorted. Every object has a set of pointers to other objects, which need to come before this object (or are considered smaller than this object). It is kind of a make-tool algorithm. I can imagine the straight-forward way to attack this -- searching. Is there some more elegant way I'm missing? The number of objects not small. I tried to write some recursive functor to be passed to std::sort -- caching the result of previous comparisions -- but I was not successful. My brain is hurting... Thanks Peter struct object { std::set<object*> m_sPredecessors; }; // to be sorted: std::list<object*> sList; std::list<object*> sort(std::list<object*> _sList) { std::set<object*> sSet; std::list<object*> sSorted; while (_sList.size()) for (std::list<object*>::iterator p = _sList.begin(), pNext = p, pEnd = _sList.end(); p != pEnd; p = pNext) { ++pNext; bool bFound = false; for (std::set<object*>::const_iterator p1 = (*p)->m_sPredecessors.begin(), p1End = (*p)->m_sPredecessors.end(); p1 != p1End; ++p1) if (sSet.find(*p1) == sSet.end()) { bFound = true; break; } if (!bFound) { sSorted.push_back(*p); _sList.erase(p); } } return sSorted; }

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Multi Index Container - find() not working with std::string, kind of stuck...
by Steve Hibbert 09 Jul '11

09 Jul '11

Hi, I've hit a snag with the Boost Multi Index Container, and I'd really appreciate some help. I've set up a container and I am using it to store shared pointers to custom objects. The custom objects are just data collections effectively, including std::strings, chars, ints etc. The problem is that when I try to find a string in the MIC, the find function sometimes succeeds, and sometimes returns the same iterator as .end(), indicating a failure to find. Yet, if I iterate through the container testing the strings, the string is always found. I've done something wrong, but I do not know what it is. Here's the container definition... typedef boost::multi_index::multi_index_container < spExchOrder, boost::multi_index::indexed_by < boost::multi_index::ordered_unique // 0 index - shared pointer index < boost::multi_index::identity<spExchOrder> > , boost::multi_index::ordered_unique // 1 index - Exchange ID eg "ORD-WIDGET-Timestamp" < boost::multi_index::const_mem_fun< FC::ExchOrder, std::string, &FC::ExchOrder::ID > > , boost::multi_index::ordered_unique // 2 index - OrigDetails eg "CLIENTA|ORDER00123" < boost::multi_index::const_mem_fun< FC::ExchOrder, std::string, &FC::ExchOrder::origDetails > > > > OrderReg; The spExchOrder typedef is just a std::tr1 shared pointer to an FC::ExchOrder object. This object has member functions that return the ID and origDetails member variable data as std::string type. Both are guaranteed unique. I'm searching the MIC using this kind of code: std::string sExchID = "Passed in Exchange ID"; OrderReg::nth_index<1>::type::iterator i = m_regOrders.get<1>().find( sExchID ); OrderReg::nth_index<1>::type::iterator iEnd = m_regOrders.get<1>().end(); if ( i != iEnd ) { // Found, do what needs to be done } I add shared pointers to the MIC like this: m_regOrders.insert(spOrder); When needed, shared pointers are deleted like this: OrderReg::nth_index<0>::type& indexSP = m_regOrders.get<0>(); iDelCount = indexSP.erase(spOrder); Any help with this would be greatly appreciated. Multi Index Containers have sorted out a number of problems for me, but I can't get past this issue. Thanks in advance, Steve

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Metaprogamming question
by John M. Dlugosz 09 Jul '11

09 Jul '11

I roughed out a function that will be a template that dispatches to one of several different forms based on the nature of one of the arguments. It's fairly simple, each helper call asking one question to further divide it up. But, I want to write a dozen functions that all have similar (if not identical) issues. So I want to abstract out the mixmaster and code that once. I'm thinking that I map the argument to a "tag" that has many possible values, and have one set of overloaded functions. It is easy to write the back end, as each function's tag is clear what that case is for. Furthermore, I can make the tags empty structs that use an inheritance pattern, so any forms I don't supply for some function will simply pick the more general one. So, how do I write the metafunction that maps the type to the tag? I could follow my same approach of one step at a time. But I wonder if a "switch" statement of some kind would be clearer and easier. OTOH, I don't want to learn all of MPL just for one thing, and I don't want to bog down the compilation speed. Is there something specific someone can point me to? Second, my pseudocode has a metafunction for telling me whether a type is a resizable container. STL containers predate the modern style of metafunctions and use cumbersome traits instead, but is there something around that I can use to tell that something is supposed to be a STL container or specific categories of containers? I could just list them all one by one, but type_traits already did that for me for a lot of things, and I'd have to tell everyone how to meta-annotate their own classes that are supposed to work "like" STL containers for algorithms. Can I use something like enable_if to tell if a class has a push_back or resize function? Thanks everyone, --John

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Boost.Operators on a POD class
by Krzysztof Czainski 08 Jul '11

08 Jul '11

Hello, A simplified example of what I am trying to accomplish follows: // needs to be a POD struct Point { double x, y; // some functions... }; Now I would like Point to be additive, and multiplicative by double, so normally I'd write: struct Point : additive1< Point, multiplicative2< Point, double > > { // supply the needed operators, and let Boost.Operators do the rest }; But Point needs to be POD, and inheritance kills POD-ness. So I'm wondering, can Boost help me here? Regards, Kris

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Boost in X-Code 4
by Mark Schisler 08 Jul '11

08 Jul '11

When compiling for the iPhone simulator with the following command: ./bjam --prefix=/Downloads/boost_install/ toolset=darwin architecture=x86 target-os=iphone macosx-version=iphone-${SDK_VERSION} --with-date_time --with-regex --with-thread link=static install And the following user-config.jam: using darwin : 4.2.1~iphone : /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 : <striper> <compileflags>"-arch armv7" <compileflags>-mthumb <compileflags>-D_LITTLE_ENDIAN : <architecture>arm <target-os>iphone ; using darwin : 4.2.1~iphonesim : /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-g++-4.2 : <striper> <compileflags>"-arch i386" <compileflags>-D_LITTLE_ENDIAN : <architecture>x86 <target-os>iphone ; using darwin : 4.2.1~darwin : /Developer/usr/bin/gcc : <striper> <compileflags>"-arch i386" <compileflags>"-arch x86_64" : <architecture>x86 <target-os>darwin I receive the following linker error when I attempt to link against the reg ex library: ld: bad codegen, pointer diff in boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >::rethrow() constto global weak symbol vtable for boost::exceptionfor architecture i386 collect2: ld returned 1 exit status Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 failed with exit code 1 I've noticed that many people have managed to get around this error by hiding boost's symbols, however, that doesn't seem to be the preferred approach as it requires hiding all of my projects symbols, which will prevent me from being able to handle exceptions according to Apple docs: > If your symbol uses runtime type identification (RTTI) information, > exceptions, or dynamic casts for an object that is defined in another > library, your symbol must be visible if it expects to handle requests > initiated by the other library. For example, if you define a catch > handler for a type in the C++ standard library, and you want to catch > exceptions of that type thrown by the C++ standard library, you must > make sure that your typeinfo object is visible. Is there another approach to fixing this linker error? Thanks, Mark

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stop a socket
by Gianni Ambrosio 08 Jul '11

08 Jul '11

Hi All, I would like you to explain me a detail of io_service. In my case I attach a socket to the io_service but if the socket is still open the io_service.stop() does not work as expected. Is there a way to close the socket just through the related io_service? Regards Gianni

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[pool] Memory usage with boost::pool
by Daniele Barzotti 08 Jul '11

08 Jul '11

Hi, in my project I try to use boost::pool to handle memory allocation/deallocation. I have a MemoryManager object with two simple methods: void* WaveStreamMM::AllocateBuffer(size_t numbytes, int memtype) { boost::mutex::scoped_lock lock(m_mutex); void *buf = m_pool.ordered_malloc(numbytes); memset(buf, 0, numbytes); return buf; } void WaveStreamMM::FreeBuffer(void *p) { boost::mutex::scoped_lock lock(m_mutex); m_pool.free(p); } If I use the code above, the memory usage of my application increase over the time, while if I substitute the allocation/deallocation respectively with: void *buf = malloc(numbytes); and free(p); the memory usage remains constant. I wrong something? Regards, Daniele.

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boost::asio::tcp -> asyncconnect generates multiple sockets
by Hert 08 Jul '11

08 Jul '11

hello, I noticed that when asynchronously connecting to an acceptor on localhost using boost::asio::ip::tcp::socket generates 2 TCP sockets on the system. One to the acceptor and one to the other one. Stepping into the code I can see where it is done, but I don't understand why. So why is this extra TCP socket there? thanks in advance, Gert -- View this message in context: http://boost.2283326.n4.nabble.com/boost-asio-tcp-asyncconnect-generates-mu… Sent from the Boost - Users mailing list archive at Nabble.com.

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