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how to get local ip address using boost::asio
by Sergey Nikulov 18 Jun '07

18 Jun '07

Hi All, I'm looking for possibility to get my local ip address (not loopback) using boost::asio. Is it possible? I'm trying to use local_address_ = socket_.local_endpoint().address(); right after I connect to remote server, but it always return "127.0.0.1" as result. Could you please point me to information how to get address of my network card? Thank you.

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hidden directories
by Jacky J 17 Jun '07

17 Jun '07

How do i create hidden directories with the boost filesystem in linux? if i call create_directory(".test"), it gives me an error Thanks

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[pointer container] How to avoid double allocation?
by Seweryn Habdank-Wojewódzki 17 Jun '07

17 Jun '07

HI! Is there any opportunity, to avoid double allocation of memory using pointer containers? I have simple code (below) and I want allocate memory for objects, construct them, and _move_ (transfer) pointer to the container. Valgrind shows me that there are made 2 alocations even if I am creating only 1 object. ==20121== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 7 from 1) ==20121== malloc/free: in use at exit: 0 bytes in 0 blocks. ==20121== malloc/free: 2 allocs, 2 frees, 8 bytes allocated. What is happening If the object is huge? Is there any way to transfer the pointer? Regards. #include <boost/ptr_container/ptr_vector.hpp> class Foo { public: Foo (int const i) : i_ (i) {} private: int i_; }; Foo * ret_ptr(int const i) { return new Foo(i); } int main() { boost::ptr_vector<Foo> vfoo; for (int i = 0; i < 1; ++i) vfoo.push_back (ret_ptr(i)); } -- |\/\/| Seweryn Habdank-Wojewódzki \/\/

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[boost] building CVS HEAD on msvc 8.0
by Andy Stevenson 16 Jun '07

16 Jun '07

Hi, Moved from cygwin onto native msvc. Trying to build libraries from the HEAD sources on msvc and it can't find wtypes.h... windows.h etc I tried pointing at the mingw headers but that was a complete waste of time.... What am i doing wrong? Andy

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[asio] some design questions
by Yuval Ronen 16 Jun '07

16 Jun '07

Hi. I'm looking at the Design page of the asio docs (http://tinyurl.com/2b5afn) and several questions come to mind: 1. The "Proactor" page has Advantages/Disadvantages section, but it doesn't specify in comparison to what (advantages and disadvantages are always compared to something). I'm getting the impression that it's compared to the Reactor approach. Is this correct? 2. The "Platform-Specific Implementation" page notes that when using select/epoll/kqueue, demultiplexing is performed in one of the threads that calls boost::asio::io_service::run(). I assume that when this thread is awaken to perform some task, one of the other threads that called run() on the same boost::asio::io_service takes it position as waiting on select/epoll/kqueue. Is this correct? 3. The "Platform-Specific Implementation" page also notes that "An additional thread per io_service is used to emulate asynchronous host resolution. This thread is created on the first call to either boost::asio::ip::tcp::resolver::async_resolve() or boost::asio::ip::udp::resolver::async_resolve()." So I guess that if I resolve() rather than async_resolve(), then no thread is created, and the actual resolving is done in the thread that called resolve()? I think all these notes would be a good addition to the docs. Thanks.

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Boost 1.34 and Visual C++ "Orcas"
by Josue Gomes 16 Jun '07

16 Jun '07

Hi, I've successfully built Boost 1.34 with MS Visual C++ "Orcas" Express Edition. To do so I've modified msvc.jam and visualc.hpp. Here the patch files for all of you interested. --- msvc.jam 2007-05-13 07:37:48.562500000 -0300 +++ msvc.jam 2007-05-12 13:10:57.734375000 -0300 @@ -231,6 +231,10 @@ local rule configure-really ( { # Even if version is not explicitly specified, try to detect the version # from the path. + if [ MATCH "(Microsoft Visual Studio 9.0)" : $(command) ] + { + version = 9.0 ; + } if [ MATCH "(Microsoft Visual Studio 8)" : $(command) ] { version = 8.0 ; --- visualc.hpp 2006-01-13 04:48:08.000000000 -0200 +++ visualc.hpp 2007-05-12 13:07:19.500000000 -0300 @@ -168,8 +168,8 @@ #error "Compiler not supported or configured - please reconfigure" #endif // -// last known and checked version is 1400 (VC8): -#if (_MSC_VER > 1400) +// last known and checked version is 1500 (VC9): +#if (_MSC_VER > 1500) # if defined(BOOST_ASSERT_CONFIG) # error "Unknown compiler version - please run the configure tests and report the results" # else Regards, josuegomes at gmail dot com

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[Serialization] BOOST_CLASS_EXPORT_GUID() destroying namespace
by Manuel Jung 16 Jun '07

16 Jun '07

Hi, When i put the script BOOST_CLASS_EXPORT_GUID() into my code directly after the definition of my base class and derived classes, my namespace seems to be broken. The classes are defined in my namespace "water". When i put the script into the code, it fails to find boost::bind in the source file! THe compiler searches for bind in the namespace "water::boost". But without the script it compiles fine! Someone got a clue whats wrong? Kind Regards Manuel Jung

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How to Compile boost on AIX using xlC
by dx 16 Jun '07

16 Jun '07

Hello, I'm having a hard time compiling boost on AIX using xlC. 1) My general question, is what steps have people taken to compile boost on AIX using xlC? - did you modify makefiles, and use gmake ? - did you use bjam instead ? - what changes are needed to various makefiles, etc., to compile on AIX with xlC ? - did you use gnu compatible xlc ? 2) Currently I'm attempting to build regex right now on AIX with xlC I could compile it easily using gcc: gmake -fgcc.mak But I can't using xlC. I've modified generic.mak, to use xlC as the compiler, and it doesn't get that far. I'm using this within the */regex/build directory. Warning messages that I've encountered so far include the following: (these are just snippets) The incomplete class "gcc_3_2_wknd" must not be used as a qualifier. A non-type template parameter cannot have type "const bool" After the warning messages are printed out, gmake returns Error 1: gmake: *** [xlC/boost_regex-xlC-1_33_1/cregex.o] Error 1 Thanks for any help. Don

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Bug in Graph Library Docs?
by David A. Greene 16 Jun '07

16 Jun '07

At http://www.boost.org/libs/graph/doc/adjacency_list.html, there's a table of how graph operations affect iterators and descriptors. That table states that add_vertex will not invalidate vertex descriptors when the vertex list is a vecS. I recently discovered that this is wrong for Boost 1.33.1. That makes sense because adding an edge could cause the vector to be reallocated and therefore all vertex descriptors to become invalid. I would assume this holds for edge descriptors and iterators as well. Is the documentation wrong or has this changed in 1.34? -Dave

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Boost Asio Error
by Simon Pickles 15 Jun '07

15 Jun '07

Hello, I've just discovered boots::asio. Looks good but got a small problem. I'm basing my client on the chat_client example, but having a problem. In the example, command line arguments are passed to the chat_client specifying server details. My question is, what is the format of the argv in the example? I have modified things a little to fit into my system, but am not sure what to pass the chat_client class. I have tried passing "localhost", but am still getting an error here: boost::asio::io_service io_service; tcp::resolver resolver(io_service); tcp::resolver::query query(DEFAULT_SERVERNAME); // DEFAULT_SERVERNAME = '127.0.0.1' tcp::resolver::iterator iterator = resolver.resolve(query); // <<< error here, in 'implementation' - not defined! m_connector = boost::shared_ptr<CConnector>( new CConnector( io_service, iterator ) ); // <<< this is just a version of chat_client.hpp Sure I am missing something simple.... thanks for any advice Simon -- http://www.simonpickles.com --- http://www.squirtualreality.com

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