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Facilities for view
by Peng Yu 16 Jul '08

16 Jul '08

Hi, I'm wondering if there is any facility to help define view in boost. There is view for static types http://www.boost.org/doc/libs/1_35_0/libs/fusion/doc/html/fusion/view.html. And there is a package to help define iterators http://www.boost.org/doc/libs/1_35_0/libs/iterator/doc/index.html. Due to the similarity between view and iterator, I'm wondering if there is a similar package for view? Thanks, Peng

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Beginner design question
by Hansi 16 Jul '08

16 Jul '08

Hello, I have to make a library which provides a few classes with different implementation. This classes should have a common interface. Normally I would use derived classes from the common interface, but this classes should be really fast. What is the best way to provide a common interface and to not have the overhead of polymorphic classes? Best regards Hansjörg

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linking problem for self registering dll ?
by Peter Boot 16 Jul '08

16 Jul '08

I am using VS2005 Professional to build an ATL dll that is self registered by the IDE. The project uses boost::regex so I needed to ad the directory containing libboost_regex-vc80-mt-gd-1_35.lib to Linker->Additional Include Directories to get it to compile. But now I am getting the following error at the self register stage, the dll registers fine when the boost::regex code is commented out or I use boost::xpressive instead. Project : error PRJ0050: Failed to register output. Please ensure you have the appropriate permissions to modify the registry. Please tell me how to fix TIA

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[Thread] Trying to share a mutex between objects
by Adam Nielsen 16 Jul '08

16 Jul '08

Hi all, I'm having some trouble getting my head around Boost mutexes and how they work. Basically I have a handful of objects, and they all use a shared resource (a C-style function.) The function isn't thread-safe, so I want to protect it to ensure only one thread at a time can call it. My idea was to create a mutex for this (lock before the call, unlock after it), but I'm having trouble working out how to share the mutex between all the objects. The boost::mutex object seems like what I want, but it's non-copyable so I can't share it among multiple objects. I tried passing around references to the mutex instead, but this just triggers an assertion failure when I try to lock it. Should I be using boost::mutex for this? How would you normally serialise access among different objects like this? I'm finding the examples somewhat tricky to work from, as most of them use global variables and C-style functions for creating threads, which doesn't really fit with the C++ model of my program - I could just make the mutex a global variable but it doesn't seem like the cleanest solution to me. Any pointers would be much appreciated. Thanks, Adam.

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How can I get a reference from a boost smart pointer?
by Meryl Silverburgh 16 Jul '08

16 Jul '08

Hi, I have a pointer to a class: A* aPt; and I deference it to pass that as a reference void aFunction(A& aRef); and I call aFunction(*aPt); but if I switch to use boost smart pointer how can I de-reference it and call aFunction()? shared_ptr<A> aPt; I tried: aFunction(aPt); // does not compile aFunction(aPt->get()); // does not compile. Thank you for any help.

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Fatal link error LNK1561: entry point must be defined when using boost::test
by Tjernstrom, Staffan 15 Jul '08

15 Jul '08

Folks, Hopefully this is me having finger trouble, but I can't seem to get around the problem. Boost 1.35 installed using the binary installer, all the vc8 flavours installed. What happens is that I try to compile / link any of the unit test examples in Visual Studio 2005 Pro, for example the code at http://www.boost.org/doc/libs/test/example/unit_test_example_05.cpp I keep getting the LNK1561: entry point must be defined error. I know that it's looking for, and picking up, the libboost_unit_test_framework-vc80-mt-1_35.lib as if I remove the /LIBPATH from the link command options it compains that it cannot find that library. I have my project settings set as follows: Compiler: /O2 /GL /I "C:\Program Files (x86)\boost\boost_1_35_0" /D "_MBCS" /FD /EHa /MD /Fo"Release\\" /Fd"Release\vc80.pdb" /W3 /nologo /c /Wp64 /Zi /TP /errorReport:prompt Linker: /OUT:"D:\staffan\Documents\Visual Studio 2005\Projects\CeT3x\test\AllUnitTests\Release\test_XOLibrary.exe" /NOLOGO /LIBPATH:"C:\Program Files (x86)\boost\boost_1_35_0\lib" /MANIFEST /MANIFESTFILE:"Release\test_XOLibrary.exe.intermediate.manifest" /DEBUG /PDB:"d:\staffan\Documents\Visual Studio 2005\Projects\CeT3x\test\AllUnitTests\release\test_XOLibrary.pdb" /OPT:REF /OPT:ICF /LTCG /MACHINE:X86 /ERRORREPORT:PROMPT kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib Any thoughts anyone? Rgds Staffan Tj. Staffan Tjernström | Sr. Software Engineer - Market Data Systems | www.esignal.com <http://www.esignal.com/> eSignal, Interactive Data Desktop Solutions (NYSE: IDC) 3955 Point Eden Way | Hayward, CA 94545-3720 | 510.723.1723 | FAX: 510.266.6100 DISCLAIMER: This message (including any files transmitted with it) may contain confidential and / or proprietary information, is the property of Interactive Data Corporation and / or its subsidiaries and is directed only to the addressee(s). If you are not the designated recipient or have reason to believe you received this message in error, please delete this message from your system and notify the sender immediately. An unintended recipient's disclosure, copying, distribution or use of this message, or any attachments, is prohibited and may be unlawful.

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boost.tokenizer (escaped_list_separator) problem
by Aljaz 15 Jul '08

15 Jul '08

Hello Why will the following code make my application crash: int main(){ std::string s = "Field 1 \"putting quotes around fields, allows commas\",Field 3"; boost::escaped_list_separator<char> sep("\"\'", " ,;", "\"\'"); boost::tokenizer<boost::escaped_list_separator<char> > tok(s, sep); for(boost::tokenizer<boost::escaped_list_separator<char> >::iterator beg=tok.begin(); beg!=tok.end();++beg){ std::cout << *beg << "\n"; } } What am I doing wrong? Many thanks in advance! Aljaz

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[boost::interprocess]trouble creating a vector in a shared memory segment
by Eugen Stoianovici 15 Jul '08

15 Jul '08

I'm having some trouble creating a vector in a shared memory segment (compilation errors) The code: int main(){ //Allocator for the event list typedef boost::interprocess::allocator <int,managed_shared_memory::segment_manager> EventAllocator; //the in memory vector of events typedef boost::interprocess::vector<int, EventAllocator> EventList; //is it already created? EventList* pEventList = segment.find<EventList>(EVENTSEGMENT_NAME).first; } The error: d:\boost_1_35_0\boost\preprocessor\iteration\detail\local.hpp(37): error C2036: 'EventList *' : unknown size And the trace: DataHandle.cpp(53) : warning C4101: 'ex' : unreferenced local variable d:\boost_1_35_0\boost\interprocess\mem_algo\rbtree_best_fit.hpp(353) : see reference to class template instantiation 'boost::interprocess::rbtree_best_fit<MutexFamily,VoidPointer,MemAlignment>' being compiled d:\boost_1_35_0\boost\preprocessor\iteration\detail\local.hpp(37) : error C2036: 'EventList *' : unknown size d:\boost_1_35_0\boost\preprocessor\iteration\detail\local.hpp(37) : see reference to class template instantiation 'boost::interprocess::vector<T,A>' being compiled with [ T=int, A=EventAllocator ] d:\boost_1_35_0\boost\preprocessor\iteration\detail\local.hpp(37) : while compiling class-template member function 'void boost::interprocess::detail::Ctor1Arg<T,is_iterator,P0>::construct_n(void *,size_t,size_t &)' with [ T=EventList, is_iterator=false, P0=EventAllocator ] d:\boost_1_35_0\boost\preprocessor\iteration\detail\local.hpp(37) : see reference to class template instantiation 'boost::interprocess::detail::Ctor1Arg<T,is_iterator,P0>' being compiled with [ T=EventList, is_iterator=false, P0=EventAllocator ] DataHandle.cpp(51) : see reference to function template instantiation 'T *boost::interprocess::detail::named_proxy<SegmentManager,T,is_iterator>::operator ()<EventAllocator>(const P0 &) const' being compiled with [ T=EventList, SegmentManager=boost::interprocess::segment_manager<char,boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>,boost::interprocess::iset_index>, is_iterator=false, P0=EventAllocator ]

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MPL apply on some exotic system
by Joel Falcou 15 Jul '08

15 Jul '08

I'm compiling some code on the Cell processor main CPU using its dedicated gcc. The code is calling mpl::apply1 onto a custom meta-function. The compiler -v is : ppu-g++ -v Using built-in specs. Target: ppu Configured with: ../toolchain/gcc/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-as=/usr/bin/ppu-as --with-ld=/usr/bin/ppu-ld --enable-threads --with-system-zlib --disable-checking --enable-__cxa_atexit --disable-libunwind-exceptions --enable-languages=c,c++,fortran,ada --disable-nls --enable-clocale=gnu --enable-version-specific-runtime-libs --with-long-double-128 --program-prefix=ppu- --disable-bootstrap --host=ppu --build=powerpc64-unknown-linux-gnu --target=ppu Thread model: posix gcc version 4.1.1 The code : template<class T> struct scalar_mode { typedef mpl::false_ status; struct base { template<class Type> struct apply : mpl::if_< is_same<T,none>, Type, T> {}; }; }; typedef mpl::apply1< scalar_mode<none>::base, float>::type type; The compiler errors are : ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp: In instantiation of 'const int boost::mpl::aux::template_arity_impl<nt2::scalar_mode<nt2::none>::base, 1>::value': ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:93: instantiated from 'const int boost::mpl::aux::template_arity<nt2::scalar_mode<nt2::none>::base>::value' ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:98: instantiated from 'boost::mpl::aux::template_arity<nt2::scalar_mode<nt2::none>::base>' ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/apply.hpp:48: instantiated from 'boost::mpl::apply1<nt2::scalar_mode<nt2::none>::base, float>' essais/simd.cpp:13: instantiated from here ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:85: error: call of overloaded 'arity_helper(boost::mpl::aux::type_wrapper<nt2::scalar_mode<nt2::none>::base>, boost::mpl::aux::arity_tag<1>)' is ambiguous ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:30: note: candidates are: char (& boost::mpl::aux::arity_helper(...))[1] ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:37: note: char (& boost::mpl::aux::arity_helper(boost::mpl::aux::type_wrapper<F<T1> >, boost::mpl::aux::arity_tag<1>))[2] [with F = nt2::scalar_mode<T>::base, T1 = nt2::none] ../../../lib/include/boost-1_35/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:37: note: char (& boost::mpl::aux::arity_helper(boost::mpl::aux::type_wrapper<F<T1> >, boost::mpl::aux::arity_tag<1>))[2] [with F = nt2::scalar_mode<T>::base, T1 = nt2::none] I know that "officially" boost is not supported on this kidn of platform but most of my code compiles and works flawlessly except for this. Any hints on what to do to fix this even locally ? Thanks in advance

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Boost/Python: stdin not found.. not sure why it is being looked for
by Martin_Thomas＠McAfee.com 15 Jul '08

15 Jul '08

I am attempting to wrap a C++ library (wrapper included below) and all seems good until I call the processDoc method around which I have put a thin wrapper. I get "RuntimeError: St9exception" so to start trouble-shooting, launched python with strace -e file and then I see the following: Traceback (most recent call last): open("<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/site-packages/setuptools-0.6c8-py2.4.egg/<stdin >", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/site-packages/lxml-2.1beta1-py2.4-linux-i686.eg g/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/site-packages/pydot-1.0.2-py2.4.egg/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOTDIR (Not a directory) open("/usr/lib/python2.4/site-packages/pyparsing-1.5.0-py2.4.egg/<stdin> ", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/site-packages/pygccxml-0.9.5-py2.4.egg/<stdin>" , O_RDONLY|O_LARGEFILE) = -1 ENOTDIR (Not a directory) open("/usr/lib/python24.zip/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/plat-linux2/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/lib-tk/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/lib-dynload/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/site-packages/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/site-packages/Numeric/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) open("/usr/lib/python2.4/site-packages/gtk-2.0/<stdin>", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory) File "<stdin>", line 1, in ? Any clues ? Thanks // Martin ProcessorWrapper.cpp: #include "Processor.h" #include <boost/python.hpp> using namespace boost::python; using namespace Fiddle; void pDoc(Processor* instance, const std::wstring& inFile, const std::wstring& outFile) { instance->processDoc(inFile, outFile); } BOOST_PYTHON_MODULE(Processor) { class_<Processor, boost::noncopyable>("Proc", no_init) .def("instance", &Processor::Instance, return_value_policy<reference_existing_object>()) .staticmethod("instance") .def("setSchemaDir", &Processor::setSchemaDir) .def("getSchemaDir", &Processor::getSchemaDir) .def("processDoc", pDoc) ; }

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