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filesystem V3 path::normalize deprecated
by Shai Shasag 09 May '12

09 May '12

I have a question regarding the deprecated function path::normalize(). Before moving to V3 I used this function to resolve paths containing "..". For example: path myPath("/Dir_A/Dir_B/a.txt/.."); myPath->normalize(); now myPath is: "/Dir_A/Dir_B" How can this be done using V3 code? Thanks, Shai PS: Could not find in docs why this function was deprecated and what replacement available.

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c++ serial com connection
by Evaggelos Tsampazis 09 May '12

09 May '12

Hi! I would like to ask if I can use the boost libraries on the IDE environment of GodeGear RAD studio (C++ builder) 2009? I included the header file <boost/asio.hpp> but I got some compilation errors. I would like to use the boost libraries to make a connection to the mobile phone (via USB) to send and receive AT Commands to it. The asio part is the best boost solution for my case. Can anyone help to explain how to make boost libraries work in the environment I am working in? Thanks, Evaggelos

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[MSM] What's the easiest way to share data between states in a Boost.MSM state machine?
by B. Tommy Jensen 08 May '12

08 May '12

As the subject indicates, I'm trying to find the best way to share data between states in a MSM state machine. My first attempt has been to let each sub-machine and state inherit from a common base class, e.g.: struct MyStateMachine_ : public msm::front::state_machine_def<MyStateMachine_,CommonBaseClass> My idea is to add a reference to some shared data in the base class, making it easy to access the shared data from any state. The shared data reference must be passed to the base class. Questions: 1. Is it possible to pass constructor parameters to the common base class' constructor? I have tried different options without success, it seems that the default constructor with no arguments is the only option. 2. If 1. is not possible, what is the best way to initialize the shared property correctly? For example an easy method to iterate over all defined states? (not only the active ones). I have tried to iterate over all states with get_state_by_id, but this method does not enter sub-machines' states. 3. In general, what is the preferred way of implementing shared data between state classes in Boost.MSM? It would have been natural to store the data in the root state, but I can't see that there is an easy way to get access to the root FSM. (only the "nearest parent" FSM in the hierarchy is passed to the various event handler methods). Regards, Tommy

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asio async_read_some handler called but has bad data
by Matt Fair 08 May '12

08 May '12

Hello, I have client/server code similar to the chat server, but I am using async_read_some/async_write_some. I am having a problem with my client when the server sends a bunch of data to it at one time. What happens is that it works for a while then readComplete is called with a full buffer and no error set, but my buffer has garbage and eventually causes my socket to crash. I wanted to check with everyone to see if they have seen this problem before, and if there is anything glaring that I'm doing wrong here with boost::asio. I noticed that in the http server it is using shared_from_this, is this necessary? If the server is sending the client data with async_write faster than I can processes it with async_read, could it cause some buffer overrun? Thanks, Matt My buffer is defined as a private array: static const unsigned int m_maxReadLength = 1024; // maximum amount of data to read in one operation char m_readBuffer[m_maxReadLength]; The client starts to read the socket with: void TCPSocket::readStart() { if(isOpen()) { // Start an asynchronous read and call read_complete when it completes or fails m_pSocket->async_read_some( boost::asio::buffer(m_readBuffer, m_maxReadLength), boost::bind( &TCPSocket::readComplete, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } } My readComplete method is: void TCPSocket::readComplete(const boost::system::error_code& error, size_t bytes_transferred) { // the asynchronous read operation has now completed or failed and returned an error if(!error && bytes_transferred <= m_maxReadLength) { //convert to string const string buffer(&m_readBuffer[0], &m_readBuffer[bytes_transferred]); //buffer eventually becomes junk ..... } else { //handle error } readStart(); //read some more data }

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boost graph: isomorphism SIGSEGV
by Vömel Christof (vome) 08 May '12

08 May '12

Hi, when testing boost graph 1.46 isomorphism on two graphs of size 11869 on x86_64-suse-linux, g++ 4.6.2, compiled at various levels of optimization, I consistently get the following error. (on very small graphs, everything seems to work) Could this be due to a problem of recursion/stack size due to the size of the graph? Up to what size of graph is the isomorphism program sure to work? Thanks, Chris Program received signal SIGSEGV, Segmentation fault. 0x00000000004099a6 in boost::iterator_core_access::equal<boost::detail::out_edge_iter<__gnu_cxx::__normal_iterator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>*, std::vector<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>, std::allocator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property> > > >, unsigned long, boost::detail::edge_desc_impl<boost::undirected_tag, unsigned long>, long>, boost::detail::out_edge_iter<__gnu_cxx::__normal_iterator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>*, std::vector<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property>, std::allocator<boost::detail::sei_<unsigned long, std::_List_iterator<boost::list_edge<unsigned long, boost::no_property> >, boost::no_property> > > >, unsigned long, boost::detail::edge_desc_impl<boost::undirected_tag, unsigned long>, long> > (f1=..., f2=...) at /usr/include/boost/iterator/iterator_facade.hpp:535 535 return f1.equal(f2);

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Aspen Meadows Resort suite available for up to 4 nights of C++Now Conference
by Pdruck 08 May '12

08 May '12

Hi. I reserved a suite at Aspen Meadows Resort for 4 nights, for the C++Now conference; Sunday night, May 13 – Wed night, May 16, leaving Thurs. May 17. But due to last minute pressing events in the office, I have to cancel my registration. Propose to switch my reservation to whomever might be attending. Win-win. I don’t lose a heft cancellation fee. You get a beautiful suite (having been there previously) and conveniently located to the conference at Physics Center. Regards. Phil

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Re: [Boost-users] Updating filesystem to V3 (boost 1.49) - normalize deprecated
by Shai Shasag 08 May '12

08 May '12

Thanks, Lars I defined the macros only for my code and now everything compiles. I have a question regarding the deprecated function path::normalize(). Before moving to V3 I used this function to resolve paths containing "..". For example: path myPath("/Dir_A/Dir_B/a.txt/.."); myPath->normalize(); now myPath is: "/Dir_A/Dir_B" Can this be done using V3 code? Thanks, Shai

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Use boost::object_pool can not quit clearly. Am I misusing?
by 文凯 08 May '12

08 May '12

I use boost::object_pool in my program, but I found some problems, it can not quit. Below is the code. Don't suggest me use boost::pool. The boost::pool is no problem, just discuss the boost::object_pool. Could anybody help me? #include <iostream> #include <boost/pool/object_pool.hpp> int main(void) { boost::object_pool<int> p; int count = 1000*1000; int** pv = new int*[count]; for (int i = 0; i < count; i++) pv[i] = p.construct(); for (int i = 0; i < count; i++) p.destroy(pv[i]); delete [] pv; return 0; } This program can not quit normally. Why? http://stackoverflow.com/questions/10491649/use-boostobject-pool-can-not-qu… -- Cheers & KaiWen

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Technical Question
by Erwin C. 07 May '12

07 May '12

Hey Boost! I plan on using Boost for the first time for our school project during our third year. I am using Visual Studio 2010 (windows) as the only member in the project to use Boost with. I added the root of the boost folder as additional include directory which turns out to be the correct way for the includes to work. But when i build i get the following error. 1>LINK : fatal error LNK1104: cannot open file 'libboost_system-vc100-mt-gd-1_49.lib' I searched thoroughly on google but i did not know what to do with the information... Kind Regards. Erwin

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Forwarding ctor calls in fusion sequence
by Joel Falcou 07 May '12

07 May '12

Say I have a fusion vector of different types with a constructor taking an int. eg: fusion::vector< std::vector<double>, std::vector<int> > and I have such a type as a member of a class foo. Now class foo has a constructor taking an int and I want to forward this parameter to all constructor of my fusion sequence member. Is there a C++03 way to do this with minimal amount of copying ?

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