May 2012 - Boost-users - lists.boost.org

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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[asio] Connection not ending
by Markus Bonk 07 May '12

07 May '12

Hi, I have a server and connection originally based on the http server 3 example. I am calling io_service::stop which results in the server run() being ended. Currently, though, I am not seeing the connection being ended, or the destructor being called. I interpret this as being because the shared_ptr to the connection instance is still being held by the async_read_some() callback functor. I was expecting the stop() to result in the async_read_some() exiting/aborting. Should it or do I need to do something specific to get rid of the connection? I am using boost 1_44 Markus ________________________________ Markus Bonk Senior Software Engineer [cid:imagee211e8.GIF@21ba809e.4bbea53b] 3Dconnexion GmbH Clarita-Bernhard-Str. 18 81249 München Germany Tel: +49 (89) 897 45 42 - 70 Fax: +49 (89) 897 45 42 - 50 markus_bonk(a)3dconnexion.com<mailto:markus_bonk@3dconnexion.com> Kennen Sie schon die NEUE SpaceMouse Pro? Hier klicken um mehr zu erfahren!<http://www.3dconnexion.de/products/spacemousepro.html?3dxcp=signature_mail> Geschäftsführer: Antonio Pascucci Sitz der Gesellschaft: München Registergericht: München HRB 99232

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boost::function and cross dll call issue
by ariasgore＠gmx.de 07 May '12

07 May '12

Hello, I have a weird access violation when using boost::function which is passed from one DLL to another. At work we use an engine that loads libraries at runtime. One of those libraries provides a class, that looks like that: class CLib { public: LIB_API CLib(void); typedef boost::function<void ()> Func; LIB_API void virtual Invoke(Func * func); }; Another library tries to make use of this lib by void freedummy() { int x = 0; } CLib::Func f = freedummy; f(); // testinvoke locally c.Invoke(&f); // passing to dll The invocation fails hard with Visual Studio 2008 SP1 (Windows 7 64bit, application as 32 bit) when passing to the other dll. The result is a call to a function address that points to nomans-land (c.Invoke()), whereas the direct f() call invokes the freedummy correctly. I have tried to create a very basic reproducer for this case and I could not make it crash. I tried to track down the execution of freedummy in the disassembler. The f-Pointer remains the same all the time but when boost::function0<void>::operator()() gets called on the lib the ptr to f remains correct but the inner function_ptr pointing to freedummy gets corrupted and pointing into garbage. Since I could NOT reproduce it with a simple test setup and I actually am not very sure why this fails I am a bit out of ideas. Can there be somehow a misalignment or different assembler (The dlls may have been compiled with different settings, not sure). I just remembered that this line: vtable_type* get_vtable() const { return reinterpret_cast<vtable_type*>( reinterpret_cast<std::size_t>(vtable) & ~static_cast<size_t>(0x01)); } (in function_template.hpp on 678) looked different in the disassembler when called f() in the main executable compared to the invocation in CLib in the external dll. Can I somehow get a better grip on what's happening? My assembler is not that strong that I could understand all those calls when journeying down the boost call stack. Any hint appreciated, Sam -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

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Using boost interprocess features from inside Class member functions
by Achuth Sankar 06 May '12

06 May '12

Hi All Am facing a lot of issue while using interprocess features inside my class file. I am pasting my class file below: class MyClass{ Ref* ref; public: MyClass(); void initializeBuffers(); void processMessage(); ~MyClass(); }; void MyClass::createBuffer() { shared_memory_object::remove("test"); shared_memory_object shm(open_or_create, infoBufferName, read_write); shm.truncate(sizeof(ServerDetails)); mapped_region region(shm, read_write); void* addr = region.get_address(); ref=new (addr) Ref; ref->value=50; } void MyClass::processMessage() { printf("%d",ref->value); //I get a segmentation fault in here. } int main() { MyClass c(); c.createBuffer(); c.processMessage(); } When I execute this I am getting segmentation exception. If I merge processMessage and createBuffer under same function it starts working. But if in any case I change the function signature to have an argument again this issue starts. Am not sure if I am doing some thing wrong above. Please do help me on this. Error I get is: Program received signal SIGSEGV, Segmentation fault. 0x77d41df8 in ntdll!RtlGetCompressionWorkSpaceSize () from C:\Windows\system32\ntdll.dll -- Achu

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Updating filesystem to V3 (boost 1.49)
by Shai Shasag 06 May '12

06 May '12

I'm in the process of updating my code to use filesystem V3. I replaced all the V2 deprecated functions with V3 calls. I defined the macros: BOOST_FILESYSTEM_VERSION=3 BOOST_FILESYSTEM_NO_DEPRECATED When compiling the file libs/filesystem/v3/src/path.cpp I get the following error: #error both BOOST_FILESYSTEM_DEPRECATED and BOOST_FILESYSTEM_NO_DEPRECATED are defined The reason for this error is that in filesystem/v3/config.hpp has the following: // BOOST_FILESYSTEM_DEPRECATED needed for source compiles # ifdef BOOST_FILESYSTEM_SOURCE # define BOOST_FILESYSTEM_DEPRECATED # endif So i'm puzzled as to why BOOST_FILESYSTEM_DEPRECATED is forced when compiling path.cpp? And how can I avoid theses erros when compiling filesystem V3? Thanks Shai Boost version: 1.49 Compiler: gcc version 4.2.1, Xcode 3.2.5 on Mac OS 10.6.8

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random number generators seeding with 0 and 1
by Nelis Willers 05 May '12

05 May '12

Dear Boost Users While testing my RNG I noticed that the use of seed value 0 yields the same results as using a seed value of 1. It seems that this is the specified behaviour for rand() in the C runtime library: http://stackoverflow.com/questions/8049556/whats-the-difference-between-sra… I could find no reference to this in my (oldish) draft C++0x spec. Also no mention in the boost random doc page. I tried to unravel the random include files, but got lost. Is this behaviour required by the specification or just following tradition? More important, is this behaviour guaranteed in all libraries? thanks! nelis

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Building boost to NOT USE built-in Visual Studio 2010 TR1 random
by Nelis Willers 05 May '12

05 May '12

Dear Boost-Users boost 1.49.0 and Visual Studio 2010 / Visual Studio 2005 / & g++ 4.6.3 on (Win7 and Ubuntu 12.04) Build boost libs locally, using the local compilers. The objective is to get exactly the same random number generator behaviour for the same application built with VS2005, VS2010 and Gnu compilers. Building the same code, I see the* same normal & uniform* results under gnu and VS2005 builds (presumably boost random is used under VS2005). Building the same code, I see the different *normal results* under gnu and VS2010 builds (presumably the native VC lib is used under VS2010). So I would like to use (at least) boost's random library instead of the native Visual C++ 2010 library. >From boost docs I learned that it is possible to set up the boost config files such as to use/not use the native compiler/library TR1 implementation: http://www.boost.org/doc/libs/1_49_0/libs/config/doc/html/index.html#boost_… http://www.boost.org/doc/libs/1_49_0/libs/config/doc/html/boost_config/boos… http://www.boost.org/doc/libs/1_49_0/doc/html/boost_tr1/usage.html#boost_tr… I cannot however, figure out how to do this from the above docs. BOOST_HAS_TR1_RANDOM comes into it, but I fail to get the big picture. Can anybody please advise? thanks in advance! nelis

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Bimap compare function
by Tyler Conant 05 May '12

05 May '12

I noticed that the comparator for a bimap can only be a Functor Type. It does not appear that I can pass a function object or a function pointer, as a STL Set would allow. Is this correct or did I miss something. For my application I could really use the ability to pass in comparator which is decided at runtime. Does anyone have any suggestions on a work around?

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[mpl] Why no wrapper for pointers as non-type template parameters?
by Philipp Moeller 04 May '12

04 May '12

I'm a little surprised that the MPL does not offer a wrapper for pointers as constants. They sometimes come in handy to specify lists to different callable objects. Something along the lines of: template<typename T, T N> struct ptr_wrap { static const T value; typedef ptr_wrap<T, N> type; typedef T value_type; }; template<typename T, T N> typename ptr_wrap<T, N>::value_type const ptr_wrap<T, N>::value = N; already does the job for me, but it could possibly be enhanced with a helper to use the correct syntax for pointers to member. Could this be an addition to the library or is there a better way? Cheers, Philipp Moeller

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[Serialization] Linker errors issue with using binary_wiarchive.hpp and binary_woarchive.hpp
by Lord Metritutus Merkwurdichliebe 04 May '12

04 May '12

Hello there, I've never used one of these Mailing List conversations before so I apologise for any mistakes. To the point: I'm having issues trying to get the wide character version of Boost's serialization libaries working. When I attempt to compile the result is a multitude of Linker errors. After Googling failed to turn up anything I posted the question on Stack Overflow, where a reply suggested there may be 'a bug in Boost.Serialization'. Stack Overflow features nice syntax highlighting so it is easy to see the code, I pieced it together from other normal character examples: http://stackoverflow.com/questions/10439984/serialization-example-of-boost-… If there is a rule against posting external links, I apologise. Or if people want me to paste the code directly in to an email for this mailing list I will do so. The Stack Overflow question was originally based on my thought that I had made a mistake in my code. If this IS the case then I do apologise, and I would appreciate knowing just where I've gone wrong. Regards.

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Re: [Boost-users] [Serialization] Linker errors issue with using binary_wiarchive.hpp and binary_woarchive.hpp
by Lord Metritutus Merkwurdichliebe 04 May '12

04 May '12

I believe I was asked this in the Stack Overflow question I linked as well. Assuming that all the .lib files in the stage/lib folders are the built libraries (I could be wrong so please correct me if that is the case), and assuming that libboost_serialization-vc100-mt-1_47.lib or libboost_serialization-vc100-mt-gd-1_47.lib are the libraries I need, I believe that both of the latter things you mentioned are satisfied. Regards. From: bryan.bagnall(a)navy.mil To: boost-users(a)lists.boost.org Date: Thu, 3 May 2012 18:36:03 -0700 Subject: Re: [Boost-users] [Serialization] Linker errors issue with using binary_wiarchive.hpp and binary_woarchive.hpp From: http://www.boost.org/doc/libs/ It looks like the serialization library requires you to build boost (it is not header only) Instructions can be found here: http://www.boost.org/doc/libs/1_49_0/more/getting_started/windows.html http://www.boost.org/doc/libs/1_49_0/more/getting_started/unix-variants.html If you have built boost already, make sure to include the boost libs in your linker path. Regards -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Lord Metritutus Merkwurdichliebe Sent: Thursday, May 03, 2012 5:09 PM To: boost-users(a)lists.boost.org Subject: [Boost-users] [Serialization] Linker errors issue with using binary_wiarchive.hpp and binary_woarchive.hpp Hello there, I've never used one of these Mailing List conversations before so I apologise for any mistakes. To the point: I'm having issues trying to get the wide character version of Boost's serialization libaries working. When I attempt to compile the result is a multitude of Linker errors. After Googling failed to turn up anything I posted the question on Stack Overflow, where a reply suggested there may be 'a bug in Boost.Serialization'. Stack Overflow features nice syntax highlighting so it is easy to see the code, I pieced it together from other normal character examples: http://stackoverflow.com/questions/10439984/serialization-example-of-boost-a rchive-binary-woarchive-hpp-and-or-boost-archive <blockedhttp://stackoverflow.com/questions/10439984/serialization-example-of -boost-archive-binary-woarchive-hpp-and-or-boost-archive> If there is a rule against posting external links, I apologise. Or if people want me to paste the code directly in to an email for this mailing list I will do so. The Stack Overflow question was originally based on my thought that I had made a mistake in my code. If this IS the case then I do apologise, and I would appreciate knowing just where I've gone wrong. Regards. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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[Polygon] Multiple Holes
by Bagnall, Bryan D CIV SPAWARSYSCEN-PACIFIC, 56220 04 May '12

04 May '12

Hello, I'm trying to use Boost::polygon to do Boolean operations in my project. My project uses contours that I'm grabbing with OpenCV, processing with Boost::polygon, then writing out to an ESRI shapefile. OpenCV can give me a list of contours within contours within contours...etc, and shapefiles can be written out this way (see link for picture http://icode-mda.googlecode.com/svn/trunk/examples/09_KMLshp/shapefilesWithH oles/results/blobsWithHoles.png ) I haven't been able to jam all of the data in a single polygon_with_holes_data polygon. Is it true that boost::polygon::polygon_with_holes_data can only have an exterior contour and multiple holes, but no contours inside of the hole? In other words, could a single boost polygon support a continent with a lake, with an island, with a pond, with a small island... ? Is there another type that would support this? Maybe the Geometry library? My current work around is to have (1)the continent with a lake as one polygon, (2)the island with a pond as another,(3)the small island as another... Thanks, Bryan

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[Serialization] Issues with C++/CX in MSVC 11
by Brent Lewis 04 May '12

04 May '12

In porting a project from iOS to Windows 8, I'm continuing to use Boost 1.49 to save the state of the program. I'm having what seems to be problems with a compiler bug. I'm wondering if anyone has found a workaround? Thought it's probably not necessary, I'll explain exactly what I'm seeing in detail in case it's helpful. If one creates a new Visual Studio project from the C++ Metro style Direct3D application template, simply adding these lines to the main function works just fine: std::stringstream memStream(std::ios_base::binary | std::ios_base::in | std::ios_base::out); boost::archive::binary_oarchive oa(memStream); However, when I add the rest of the project files (even if I don't instantiate any of the classes - just adding the modules does it), the two same lines in the main function crash. I eliminated all the code from the modules that refer to serialization and archive classes, because I noticed that there was a lot of static initialization of singletons of templated archive classes. Even with minimal static initializers, still, the code fails to run. Closest thing I can tell is that the compiler is not correctly translating the this pointer when moving from a class's initializers into a superclasse's constructor when multiple inheritance is involved (and perhaps lots of templating is required too). To be specific, in one specific run of the application (note that I've removed the template parameters for brevity): Inside binary_oarchive_impl ctor, the this pointer is: 0x0091fcb8 moving into its superclass constructor, basic_binary_oprimitive, the this pointer is: 0x0091fcc1 That would suggest that the superclass is 9 bytes into the derived class, however: back inside the binary_oarchive_impl ctor, using the debugger: (boost::archive::basic_binary_oprimitive*)this : 0x0091fcc4 offsetof(basic_binary_oprimitive, m_sb) = 0 (offsets retrieved by inspecting/altering memory, since you can't get the offset of a reference type) offsetof(binary_oarchive_impl, m_sb) = 12 Which clearly indicates that the superclass is 12 bytes into the derived class. In the superclass, it initializes m_sb - which is a reference to the stream buffer the archive writes to. Stepping back out of the superclass constructor, back into the derived class constructor, m_sb points to the wrong memory, of course. Has anyone else experience this with C++/CX? Is there an existing bug report? We've got a Microsoft contact that's helping us iron out issues. Does anyone know a concise repro that'll help MS solve this problem faster? Thanks for any information.

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[Range] Weak concept assertions.
by Robert Jones 03 May '12

03 May '12

Here's a snippet from boost/range/algorithm_ext/push_back.hpp... namespace boost { namespace range { template< class Container, class Range > inline Container& push_back( Container& on, const Range& from ) { BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<Container> )); BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const Range> )); BOOST_ASSERT( (void*)&on != (void*)&from && "cannot copy from a container to itself" ); on.insert( on.end(), boost::begin(from), boost::end(from) ); return on; } } // namespace range using range::push_back; } // namespace boost Shouldn't the first concept assert be asserting that 'Container' is in fact a container, not a range? Thx - Rob.

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[asio] documentation example, bind semantics
by John M. Dlugosz 03 May '12

03 May '12

In boost_asio/tutorial/tutdaytime3.html, the code shown is: void handle_accept(tcp_connection::pointer new_connection, const boost::system::error_code& error) { and is called via a function object: boost::bind(&tcp_server::handle_accept, this, new_connection, boost::asio::placeholders::error) I get after my coworkers I'm mentoring in the area of C++ skills to pass smart pointers by const-ref not by value, since the atomic inc/dec is very costly. I believe that a boost::function (and now std::function) will hold the object by value even if the function being bound declares it as reference, and the INVOKE phase will bind the parameter to the stored copy in the function object. So handle_accept can and should be declared as using a const tcp_connection::pointer& as well, right? Is there any reason not to? —John

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[Boost.Integer] On Win32, boost::uint_t<65>::fast has 64 bits?
by Scott Meyers 03 May '12

03 May '12

The type yielded by boost::uint_t<N>::fast seems pretty clear: "The easiest-to-manipulate, built-in, unsigned integral type with at least N bits." But when I run the following program, which prints the number of bits in the type returned by boost::uint_t<65>::fast (i.e., a type with at least 65 bits), I get 64. #include <iostream> #include <climits> #include <boost/integer.hpp> int main() { std::cout << "boost::uint_t<65>::fast has " << CHAR_BIT * sizeof(boost::uint_t<65>::fast) << " bits\n"; } I get the same results with VC10, VC11 beta, and gcc 4.7 on Win32 with Boost 1.49. I must be doing something wrong, right? But what? Thanks, Scott

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Fusion warning cleanup
by Belcourt, Kenneth 03 May '12

03 May '12

Hi, Could these (and other) auto generated headers be emitted so they don't trigger these sorts of warnings? We get these warnings with multiple compilers. Thanks. -- Noel Belcourt CC-1 crayc++: WARNING File = /scratch1/kbelco/boost/boost/status/../boost/fusion/tuple/detail/preprocessed/tuple_fwd.hpp, Line = 21 The source file does not end with a new-line character. #endif ^ CC-1 crayc++: WARNING File = /scratch1/kbelco/boost/boost/status/../boost/fusion/tuple/detail/preprocessed/make_tuple.hpp, Line = 21 The source file does not end with a new-line character. #endif ^ CC-1 crayc++: WARNING File = /scratch1/kbelco/boost/boost/status/../boost/fusion/tuple/detail/preprocessed/tuple_tie.hpp, Line = 21 The source file does not end with a new-line character. #endif ^

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[Range] Predicate type checking.
by Robert Jones 02 May '12

02 May '12

I'm pretty sure I'm have a 'Doh!' moment here, but why does this compile? Surely the last line of main is gibberish; the value type of m is pair, not S, so int_from_S is not a valid function? #include <boost/range.hpp> #include <boost/range/adaptor/transformed.hpp> #include <map> struct S { S( ) { } int i; }; int int_from_S( S s ) { return s.i; } int main( ) { std::map<unsigned, S> m; m[0]=S(); m | boost::adaptors::transformed(int_from_S); } Thx, - Rob.

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config. how to check if std::shared_ptr & std::scoped_ptr availability?
by niXman 02 May '12

02 May '12

Hello! I need to check if std::shred_ptr & std::scoped_ptr availability. I read boost.config and found: http://www.boost.org/doc/libs/1_49_0/libs/config/doc/html/boost_config/boos… But in this list don't exist macro that I need. Ideas? Thanks. -- Regards, niXman

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multiarray sub_array
by Petros 01 May '12

01 May '12

Hi, I want to be able to create an array view on a subset of a multi_array(MA)’s dimensions. So, say I have a MA of dimension M and I want to choose N (N <M) dimensions of it which I put on a boost::array. Say, I want to keep the entire range for each dimension. Is there a way to do this in a general fashion, i.e. w/out the use of the subscript operator on the indices object ? The documentation mentions something like : typedef boost::multi_array< double, 3 > Grid3D; typedef Grid3D::size_type size_type; typedef Grid3D::index index; typedef Grid3D::index_range index_range; typedef Grid3D::array_view<2>::type Slice2D; index_range r1; //( 0, iMax); index_range r3; //( 0, kMax); Grid3D::index_gen indices; Slice2D sliceJ2 = grid[indices [r1] [2] [r3] ]; but this is not sufficient for a generic construction. And also, what is the difference between array_view and subarray ? Thank you very much in advance, Petros

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fatal error C1001 with VS2010, boost 1.49, and shared_ptr.hpp
by Phillip Hellewell 01 May '12

01 May '12

I'm upgrading to boost 1.49 and getting this fatal error while compiling a source file that uses shared_ptr: 1>C:\mycomps\base\target\dependency\include\boost/smart_ptr/shared_ptr.hpp(362): fatal error C1001: An internal error has occurred in the compiler. 1> (compiler file 'msc1.cpp', line 1420) 1> To work around this problem, try simplifying or changing the program near the locations listed above. 1> Please choose the Technical Support command on the Visual C++ 1> Help menu, or open the Technical Support help file for more information Line 362 of shared_ptr.hpp is: shared_ptr( shared_ptr<Y> && r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() ) Looks like the compiler is crashing with an access violation; any suggestions other than wait for a patch from Microsoft? I don't want to have to disable features like BOOST_HAS_RVALUE_REFS or BOOST_SP_NO_SP_CONVERTIBLE, but that may be my only choice :( Thanks, Phillip

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async_read_some
by Christer Borgqvist 01 May '12

01 May '12

Hi, Im playing around with the /boost_asio/example/http/server3 and using POST method. The bytes_transferred is 231, but thats only the header and ends with \r\n\r\n, need to read the rest. Sometimes i get bytes_transferred to 1032, the right amount of data, sometimes i get bytes_transferred = 231, but if i print the buffer_ i have all the 1032 bytes. Is it right that the bytes in the buffer_ and the bytes_transferred is not the same? appreciate any help. /christer void connection::handle_read(const boost::system::error_code& e, std::size_t bytes_transferred) { if (!e) { boost::tribool result; boost::tie(result, boost::tuples::ignore) = request_parser_.parse( request_, buffer_.data(), buffer_.data() + bytes_transferred); if (result) { request_handler_.handle_request(request_, reply_); boost::asio::async_write(socket_, reply_.to_buffers(), strand_.wrap( boost::bind(&connection::handle_write, shared_from_this(), boost::asio::placeholders::error))); } else if (!result) { reply_ = reply::stock_reply(reply::bad_request); boost::asio::async_write(socket_, reply_.to_buffers(), strand_.wrap( boost::bind(&connection::handle_write, shared_from_this(), boost::asio::placeholders::error))); } else { socket_.async_read_some(boost::asio::buffer(buffer_), strand_.wrap( boost::bind(&connection::handle_read, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred))); } }

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Use boost::shared_ptr with boost::adaptors
by tolik levchik 01 May '12

01 May '12

The following code gives me segfault. But if `foo_ptr` is `foo*` it works fine. #include <vector> #include <boost/range/adaptor/indirected.hpp> #include <boost/range/adaptor/transformed.hpp> #include <boost/range/algorithm/for_each.hpp> #include <boost/bind.hpp> #include <boost/shared_ptr.hpp> struct foo{ foo(int _i): i(_i){} virtual void bar() const{ std::cout << "foo::bar::i " << i << std::endl; } int i; }; typedef boost::shared_ptr<foo> foo_ptr; //typedef foo* foo_ptr; foo_ptr trasform(int i){ return foo_ptr(new foo(i)); } int main(){ std::vector<int> vec; vec.push_back(1); using namespace boost::adaptors; using boost::bind; boost::for_each(vec | transformed(bind(&trasform, _1)) | indirected, bind(&foo::bar, _1)); } Is it expected behavior of adaptors ?

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