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[asio] iPad: resolver fails on a "fresh" 3G connection
by Igor R 18 May '11

18 May '11

Hello, I admit this is probably not a pure ASIO question, but perhaps someone already encountered the following issue (boost 1.46, iOS4.3). When trying to resolve a host name just after 3G connection is established (eg., switch "airplane mode" off and on), I get the following error: "Host not found (authoritative)". The query looks like this: tcp::resolver::query query(tcp::v4(), "my.host.com", "9988"); On the other hand, if prior to the above query I open the browser or some other application that connect to the Internet, then the query works correctly. Moreover, it seems that if I try the above query several times, it succeedes after a while. Another interesting point: all the above occurs with 3G connection only, while with WiFi everything works well. What's could be the reason of such a weird behavior? Thanks.

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[boost][msm] std::vector<MyStateMachine> generate stack overflow
by Klaim - Joël Lamotte 18 May '11

18 May '11

Hi, while playing with MSM using VS2010+SP1 in a very simple test project (I'm really just trying to test how to organize states classes in files), I've tried to see if I was able to create as many state machines as I wanted, so I started to write a simple std::vector<MyStateMachine> state_machines(42); Here MyStateMachine is an empty state machine class with default front-end and back-end, with only two empty states. VC10.1 produce a warning on this line saying that there will be a stack overflow because there is a runtime recursion. I checked, it does crash (in debug at least). Is it a bug? I've not found time yet to follow the code see why that produce a recursion (??!!!), but in doubt I verified simple cases : MyStateMachine state_machine ; // no problem MyStateMachine state_machines[42]; // no problem I'll post the full code here once I get home, can't access my test project at my dayjob. I think it might be a well known problem so I ask here first. Joël Lamotte

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MPI rank() & size() type
by Kraus Philipp 17 May '11

17 May '11

Hello, I use Boost MPI for some project, but I have a question of the return datatype of the communication rank() and size(). size() returns a unsigned datatype, but rank() a signed, so if I compare rank() with size() I will get a warning. Is there a reason for using different return types? Thanks Phil

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Segmentation fault when throwing exception?
by Germán Diago 17 May '11

17 May '11

Hello, I have some code that throws an exception through BOOST_THROW_EXCEPTION. The class derives from std::runtime_error. The thing is that my program crashes and doesn't catch the exception if I use this macro, but if I use a language throw it behaves correctly. Does anyone have a clue? My code doesn't spawn threads. Thanks in advance.

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BOOST_PP_ENUM_z
by er 17 May '11

17 May '11

Could someone please help clarify the meaning of the _z extension? In what situation should one use BOOST_PP_ENUM_z rather than BOOST_PP_ENUM? Usage BOOST_PP_ENUM_ ## z(count, macro, data) Arguments z The next available BOOST_PP_REPEAT dimension. http://www.boost.org/doc/libs/1_33_1/libs/preprocessor/doc/ref/enum_z.html Examples: #include <boost/preprocessor/arithmetic/inc.hpp> #include <boost/preprocessor/repetition/enum_params.hpp> #include <boost/preprocessor/repetition/repeat.hpp> #define MACRO(z, n, _) \ template< \ BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_INC(n), class T) \ > class X ## n { \ /* ... */ \ }; \ /**/ BOOST_PP_REPEAT(2, MACRO, nil) #define MACRO1(z, n, _) \ template< \ BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n), class T) \ > class Y ## n { \ /* ... */ \ }; \ /**/ BOOST_PP_REPEAT(2, MACRO1, nil) int main (int argc, char * const argv[]) { typedef X0<int> x0; typedef X1<int, int> x1; typedef Y0<int> y0; typedef Y1<int, int> y1; return 0; }

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Re: [Boost-users] [interprocess] Lost communications and mysterious names
by Roger 17 May '11

17 May '11

> From: "Ion Gaztañaga" <igaztanaga(a)gmail.com> > To: Boost User List <boost-users(a)lists.boost.org> > Date: Wed, 11 May 2011 21:20:54 +0200 > Subject: Re: [Boost-users] [interprocess] Lost communications and mysterious names > El 10/05/2011 23:18, Roger escribió: >> >> I'm using boost 1.46 on windows XP and I am having occasional issues >> with interprocess. Sometimes I lose communications between programs. >> I've located the directory where the files that enable the >> interprocess communication are created. Usually the files have the >> name I provide to the managed_shared_memory object in the code. >> However, when the problem occurs a file named something like >> "70C0A8E6490FCC01E55D313B550FCC01" appears. When the programs >> terminate this file disappears, while the normally named files >> persist. > > That name is produced when you unlink the shared memory. Code renames in-use file and marks it as delete-on-close so that it's really erased when any attached program ends. This emulates unix-like unlink behaviour. Are you unlinking the shm while in use? > > best, > > Ion I was using shared_memory_object::remove(name), if that's what you mean by unlinking. Actually I'd already solved my problem before I even asked the question - I just accidentally commented that bit out. What I was doing was periodically reopening the shared memory in processes that were reading only. So if another process removed and recreated it, it would eventually find the new copy. Is this a sensible way to do it? Is there a function to test whether the memory has been removed? The only reason I was recreating the shared memory was to ensure a cleanly initialised empty space. Perhaps I should turf the whole recreating process and go with a clearing process instead. That should be fine once what I'm sharing is fixed. But during development it can change, and I recall the programs crashing if they open an old file and try to read a variable which wasn't there in the old version.

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Compiling Issue
by Manoj Jangid 16 May '11

16 May '11

I am trying to compile a small boost thread sample in Windows 64 bit, its give me an error *LINK : fatal error LNK1104: cannot open file 'libboost_thread-vc100-mt-s-1_46_1.lib' *I have searched all the folder, rebuild boost with bjam but there is no *'libboost_thread-vc100-mt-s-1_46_1.lib' * Here is the output C:\personal\boost>cl /W3 /Zi /EHsc thread.cpp Microsoft (R) C/C++ Optimizing Compiler Version 16.00.40219.01 for x64 Copyright (C) Microsoft Corporation. All rights reserved. thread.cpp Microsoft (R) Incremental Linker Version 10.00.40219.01 Copyright (C) Microsoft Corporation. All rights reserved. /out:thread.exe /debug thread.obj LINK : fatal error LNK1104: cannot open file 'libboost_thread-vc100-mt-s-1_46_1.lib' What I am missing or doing wrong here? Thanks

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xpressive
by Louis Lavery 16 May '11

16 May '11

I'm trying to get started with boost xpressive, but have problems with this simple attempt... #pragma warning(disable:4180) // MSVC: qualifier applied to function type has no meaning; ignored #pragma warning(disable:4224) // MSVC: nonstandard extension used : formal parameter 'value' was previously defined as a type #pragma warning(disable:4996) // MSVC: 'std::transform' was declared deprecated #include <boost/xpressive/xpressive_static.hpp> void f() { using namespace boost::xpressive; sregex rex = as_xpr('k'); } ...which gives these errors... ------ Build started: Project: miscTest, Configuration: Debug Win32 ------ Compiling... main.cpp c:\boost_1_45_0\boost\xpressive\detail\static\transforms\as_matcher.hpp(27) : error C2146: syntax error : missing ';' before identifier 'data_type' c:\boost_1_45_0\boost\xpressive\detail\static\transforms\as_sequence.hpp(31) : see reference to class template instantiation 'boost::xpressive::grammar_detail::as_matcher::impl<Expr,State,Data>' being compiled with [ Expr=const boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0> &, State=boost::xpressive::detail::end_xpression, Data=boost::xpressive::detail::xpression_visitor<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>,boost::mpl::false_,traits_type> ] c:\boost_1_45_0\boost\proto\matches.hpp(828) : see reference to class template instantiation 'boost::xpressive::grammar_detail::in_sequence<Grammar>::impl<Expr,State,Data>' being compiled with [ Grammar=boost::xpressive::grammar_detail::as_matcher, Expr=const boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0> &, State=boost::xpressive::detail::end_xpression, Data=boost::xpressive::detail::xpression_visitor<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>,boost::mpl::false_,traits_type> ] c:\boost_1_45_0\boost\xpressive\detail\static\compile.hpp(45) : see reference to class template instantiation 'boost::proto::switch_<Cases>::impl<Expr,State,Data>' being compiled with [ Cases=boost::xpressive::grammar_detail::Cases<char,boost::xpressive::Grammar<char>>, Expr=const boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0> &, State=boost::xpressive::detail::end_xpression, Data=visitor_type & ] c:\boost_1_45_0\boost\xpressive\detail\static\compile.hpp(79) : see reference to function template instantiation 'void boost::xpressive::detail::static_compile_impl2<Xpr,BidiIter,traits_type>(const Xpr &,const boost::shared_ptr<T> &,const Traits &)' being compiled with [ Xpr=boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0>, BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>, T=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>>, Traits=traits_type ] c:\boost_1_45_0\boost\xpressive\detail\static\compile.hpp(99) : see reference to function template instantiation 'void boost::xpressive::detail::static_compile_impl1<Xpr,BidiIter>(const Xpr &,const boost::shared_ptr<T> &)' being compiled with [ Xpr=boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0>, BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>, T=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> ] c:\boost_1_45_0\boost\xpressive\basic_regex.hpp(252) : see reference to function template instantiation 'void boost::xpressive::detail::static_compile<Expr,BidiIter>(const Xpr &,const boost::shared_ptr<T> &)' being compiled with [ Expr=boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0>, BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>, Xpr=boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0>, T=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> ] c:\boost_1_45_0\boost\xpressive\basic_regex.hpp(118) : see reference to function template instantiation 'void boost::xpressive::basic_regex<BidiIter>::compile_<Expr>(const Expr &,boost::mpl::true_)' being compiled with [ BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>, Expr=boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0> ] c:\othertrunk\other\misc\src\main.cpp(12) : see reference to function template instantiation 'boost::xpressive::basic_regex<BidiIter>::basic_regex<boost::proto::exprns_::expr<Tag,Args,Arity>>(const Expr &)' being compiled with [ BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>, Tag=boost::proto::tag::terminal, Args=boost::proto::argsns_::term<char>, Arity=0, Expr=boost::proto::exprns_::expr<boost::proto::tag::terminal,boost::proto::argsns_::term<char>,0> ] c:\boost_1_45_0\boost\xpressive\detail\static\transforms\as_matcher.hpp(27) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int c:\boost_1_45_0\boost\xpressive\detail\static\transforms\as_matcher.hpp(27) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int c:\boost_1_45_0\boost\xpressive\detail\static\transforms\as_matcher.hpp(30) : error C2653: 'data_type' : is not a class or namespace name c:\boost_1_45_0\boost\xpressive\detail\static\transforms\as_matcher.hpp(30) : fatal error C1903: unable to recover from previous error(s); stopping compilation Build log was saved at "file://c:\otherTrunk\libs\misc\test\vc\Debug\BuildLog.htm" miscTest - 5 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== tia, Louis.

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Boost-serialization "unsupported version" exception
by Marco Piacentini 16 May '11

16 May '11

Hi guys...I have this scenario...A client which uses the version 1.46.1 of boost and serializes some structs, and a server which (must)uses the version 1.38 of boost. The problem is that when I try to deserialize the data on the server side, I've got the "unsupported version" exception... Is there any way to serialize with a downgrade version?Other suggestions?Thanks in advance...

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[boost-users][GIL] Colors broken after moving to New IO
by Szymon Gatner 15 May '11

15 May '11

Hi, Since New IO is now accepted to BOOST I could replace old one with new version (review one). Problem is, the moment I replaced header file and png_load_file() to load_image() all images have invalid colors. Am I doing to little by just replacing those 2? Regadrds, Szymon

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