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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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[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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