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Spawning processes and pipes
by Foster, Gareth 08 Jul '05

08 Jul '05

Hello, I am after a library that will let me do something like the following, and I was wondering whether there were Boost libraries that would help. /* * some pseudo code ... */ Process process("c:\someApp.exe"); process.spawn(); Process::WriteHandle WriteHandle = process.get_write_handle(); Process::ReadHandle ReadHandle = process.get_read_handle(); while(process.good()) { std::string sz_output; sz_output << ReadHandle; if(sz_output == "Continue?") { "Yes" >> WriteHandle; // etc } } Any ideas? Cheers, Gaz ********************************************** * http://www.mozilla.org/products/firefox/ * **********************************************

2 1

boost serialization 1.32
by luke 08 Jul '05

08 Jul '05

Dear list I try to read back a serialized structure (binary). It works fine with gcc 3.3 on linux but I get problems with visualstudio 7.1. reading back the file. > wrong input data > uncaught exception at: ar >> new_strucutre; Are there some hints/ experiences with Visualstudio ?? Below I have a short code abstraction what I'm doing basically. Thanks luke ==== snip ==== struct foo { int posx; int posz; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & posx; ar & posz; } }; class Manager { public: Manager(); ~Manager(); std::vector<foo> fool_; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & fool_; } private: }; struct test { int id; int age; Manager manager; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & id; ar & age; ar & manager; } }; int main() { //CREATE test test_foo; test_foo.id = 1; test_foo.age = 2; foo new_foo; new_foo.posx = 100; new_foo.posz = 110; test_foo.manager.fool_.push_back(new_foo); //WRITE std::ofstream ofsb("filenameb"); boost::archive::binary_oarchive ob(ofsb); ob << test_foo; ofsb.close(); //READBACK std::ifstream ifs(fname.c_str(), std::ios::binary); boost::archive::text_iarchive ia(ifs); ia >> new_test; // EXCEPTION ifs.close(); } ==============

3 3

[string algo]Custom Sequence
by Duane Murphy 08 Jul '05

08 Jul '05

I'm trying to define a custom sequence for use by the replace_all() function of boost::string::algo. I'm hitting an error that I am not able to decipher the cause of. In the Finder concept check in find_format.hpp (Line 238), I'm getting two errors: Error : illegal template argument(s) (point of instantiation: 'SpecifyItem(const unsigned char *, const unsigned char *, bool)') (instantiating: 'boost::algorithm::replace_all<sequence, const unsigned char *, const unsigned char *>(sequence &, const unsigned char *const &, const unsigned char *const &)') (instantiating: 'boost::algorithm::find_format_all<sequence, boost::algorithm::detail::first_finderF<const unsigned char *, boost::algorithm::is_equal>, boost::a lgorithm::detail::const_formatF<const unsigned char *>>(sequence &, boost::algorithm::detail::first_finderF<const unsigned char *, boost::algorithm::is_equal>, boost::a lgorithm::detail::const_formatF<const unsigned char *>)') find_format.hpp line 238 BOOST_STRING_TYPENAME const_iterator_of<SequenceT>::type> >(); Error : '(' expected (point of instantiation: 'SpecifyItem(const unsigned char *, const unsigned char *, bool)') (instantiating: 'boost::algorithm::replace_all<sequence, const unsigned char *, const unsigned char *>(sequence &, const unsigned char *const &, const unsigned char *const &)') (instantiating: 'boost::algorithm::find_format_all<sequence, boost::algorithm::detail::first_finderF<const unsigned char *, boost::algorithm::is_equal>, boost::a lgorithm::detail::const_formatF<const unsigned char *>>(sequence &, boost::algorithm::detail::first_finderF<const unsigned char *, boost::algorithm::is_equal>, boost::a lgorithm::detail::const_formatF<const unsigned char *>)') find_format.hpp line 238 BOOST_STRING_TYPENAME const_iterator_of<SequenceT>::type> >(); The sequence I am defining wraps a Macintosh style Pascal string. (For those not in the know, these are a string where the first byte is the length. The character type is also unsigned char.) I am defining the sequence called sequence: class sequence { public: sequence() {} sequence( unsigned char* in_sequence ) : sequence( in_sequence ) {} typedef unsigned char value_type; typedef std::ptrdiff_t difference_type; typedef std::size_t size_type; typedef unsigned char* iterator; typedef const unsigned char* const_iterator; iterator begin() { return &sequence[1]; } const_iterator begin() const { return &sequence[1]; } iterator end() { return &sequence[ sequence[0] ]; } const_iterator end() const { return &sequence[ sequence[0] ]; } private: unsigned char* sequence; }; This isn't complete, but I thought I could get a little farther than this or at least understand what I am missing from the definition that this concept check doesn't fail. I am using it like this: void SpecifyItem( unsigned string* in_pascal_string ) { sequence seq( in_pascal_string ); const unsigned char* find_this = "\pa"; const unsigned char* replace_with = "\pb"; boost::algorithm::replace_all( seq, find_this, replace_with ); } I also don't have a copy of the spec to understand all of the requirements for a sequence, so I was shooting in the dark emulating a vector to see how for I could get. I expected to get a little farther. :-) Thanks for any tips, ...Duane

2 1

BGL Subgraph has no inv_adjacency_iterator
by Gordon Smith 07 Jul '05

07 Jul '05

Not 100% sure if subgraphs are to blame, but the traits of the attached graph include: 1. adjacency_iterator 2. in_edge_iterator 3. out_edge_iterator But fails to compile when I add a "inv_adjacency_iterator". Surely this iterator is basically the same as the in_edge_iterator, with a different return type? Gordon typedef boost::adjacency_list<boost::vecS, boost::listS, boost::bidirectionalS, GjsvizVertexProperty, GjsvizEdgeProperty, GjsvizGraphProperty > DigraphType; typedef DigraphType GraphType; typedef boost::graph_traits<GraphType> Traits; typedef Traits::adjacency_iterator adjacency_iterator; **** No Compile >>>>typedef Traits::inv_adjacency_iterator inv_adjacency_iterator; typedef Traits::in_edge_iterator in_edge_iterator; typedef Traits::out_edge_iterator out_edge_iterator;

2 1

problems w/install or config ... first boost program
by Mike P 07 Jul '05

07 Jul '05

I've DL'ed and installed boost to gain access to the serialization capabilities. Here is the source code I'm trying to compile to test the install. Its the serialization equivalent of a "hello world" app.: //////////////////////////////////////////////// #include <iostream> #include <fstream> #include <boost/archive/text_oarchive.hpp> using std::cout; using std::endl; class DataHold { private: friend class boost::serialization::access; template <class Archive> void serialize(Archive & ar, const unsigned int version) { ar & data1; ar & data2; } int data1; int data2; public: DataHold(){} DataHold(int d1, int d2):data1(d1),data2(d2){} void dump() { cout << data1 << ":" << data2 << endl; } }; int main() { DataHold dt1(7,9); std::ofstream ofs("holddata.dh"); boost::archive::text_oarchive oa(ofs); oa << dt1; ofs.close(); } //////////////////////////////////////////// When I try to compile I get this: In file included from /usr/local/include/boost/config.hpp:35, from /usr/local/include/boost/archive/text_oarchive.hpp:22, from boostTest.cpp:3: /usr/local/include/boost/config/compiler/gcc.hpp:92:7: warning: #warning "Unknown compiler version - please run the configure tests and report the results" /tmp/cct6F2I3.o(.gnu.linkonce.r._ZTIN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEEE[typeinfo for boost::archive::detail::common_oarchive<boost::archive::text_oarchive>]+0x10): undefined reference to `typeinfo for boost::archive::detail::basic_oarchive' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost13serialization6detail27extended_type_info_typeid_0C2Ev[boost::serialization::detail::extended_type_info_typeid_0::extended_type_info_typeid_0()]+0x7): In function `boost::serialization::detail::extended_type_info_typeid_0::extended_type_info_typeid_0()': boostTest.cpp: undefined reference to `boost::serialization::detail::extended_type_info_typeid_0::type_info_key' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEED2Ev[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::~common_oarchive()]+0x18): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::~common_oarchive()': boostTest.cpp: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEED0Ev[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()]+0x45): In function `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()': boostTest.cpp: undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEED0Ev[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()]+0x77):boostTest.cpp: undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEED1Ev[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()]+0x45): In function `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()': boostTest.cpp: undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEED1Ev[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()]+0x77):boostTest.cpp: undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEED2Ev[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()]+0x45): In function `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()': boostTest.cpp: undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEED2Ev[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::~text_oarchive_impl()]+0x77):boostTest.cpp: more undefined references to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' follow /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEED1Ev[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::~common_oarchive()]+0x18): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::~common_oarchive()': boostTest.cpp: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEED0Ev[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::~common_oarchive()]+0x18): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::~common_oarchive()': boostTest.cpp: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEEC2Ev[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::common_oarchive()]+0xe): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::common_oarchive()': boostTest.cpp: undefined reference to `boost::archive::detail::basic_oarchive::basic_oarchive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive11save_access14save_primitiveINS0_13text_oarchiveESsEEvRT_RKT0_[void boost::archive::save_access::save_primitive<boost::archive::text_oarchive, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::archive::text_oarchive&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)]+0x20): In function `void boost::archive::save_access::save_primitive<boost::archive::text_oarchive, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::archive::text_oarchive&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': boostTest.cpp: undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost13serialization25extended_type_info_typeidIK8DataHoldEC1Ev[boost::serialization::extended_type_info_typeid<DataHold const>::extended_type_info_typeid()]+0x28): In function `boost::serialization::extended_type_info_typeid<DataHold const>::extended_type_info_typeid()': boostTest.cpp: undefined reference to `boost::serialization::extended_type_info::self_register()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive6detail21save_non_pointer_typeINS0_13text_oarchiveE8DataHoldE4save7invokexERS3_RKS4_[boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive, DataHold>::save::invokex(boost::archive::text_oarchive&, DataHold const&)]+0x17): In function `boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive, DataHold>::save::invokex(boost::archive::text_oarchive&, DataHold const&)': boostTest.cpp: undefined reference to `boost::archive::detail::basic_oarchive::save_object(void const*, boost::archive::detail::basic_oserializer const&)' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEE4initEv[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()]+0x18): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()': boostTest.cpp: undefined reference to `boost::archive::ARCHIVE_SIGNATURE' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEE4initEv[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()]+0x98):boostTest.cpp: undefined reference to `boost::archive::ARCHIVE_VERSION' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEEC2ERSoj[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::text_oarchive_impl(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)]+0x21): In function `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::text_oarchive_impl(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)': boostTest.cpp: undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::basic_text_oprimitive(std::basic_ostream<char, std::char_traits<char> >&, bool)' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive18text_oarchive_implINS0_13text_oarchiveEEC2ERSoj[boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::text_oarchive_impl(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)]+0x8c):boostTest.cpp: undefined reference to `boost::archive::basic_text_oprimitive<std::basic_ostream<char, std::char_traits<char> > >::~basic_text_oprimitive()' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost7archive19basic_text_oarchiveINS0_13text_oarchiveEE13save_overrideERKNS0_15class_name_typeEi[boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::save_override(boost::archive::class_name_type const&, int)]+0x54): In function `boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::save_override(boost::archive::class_name_type const&, int)': boostTest.cpp: undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /tmp/cct6F2I3.o(.gnu.linkonce.t._ZN5boost15smart_cast_impl9referenceIRNS_7archive13text_oarchiveEE11polymorphic5cross4castINS2_6detail14basic_oarchiveEEES4_RT_[boost::archive::text_oarchive& boost::smart_cast_impl::reference<boost::archive::text_oarchive&>::polymorphic::cross::cast<boost::archive::detail::basic_oarchive>(boost::archive::detail::basic_oarchive&)]+0xe): In function `boost::archive::text_oarchive& boost::smart_cast_impl::reference<boost::archive::text_oarchive&>::polymorphic::cross::cast<boost::archive::detail::basic_oarchive>(boost::archive::detail::basic_oarchive&)': boostTest.cpp: undefined reference to `typeinfo for boost::archive::detail::basic_oarchive' collect2: ld returned 1 exit status Now, I've tried compiling some of the sample code that comes with the boost package ... some compiles just fine, some does not and gives me similar errors to what I show above. I have no idea what these errors mean nor do I understand how to make them go away. My platform info: i386-redhat-linux gcc version 4.0.0 20050423 (Red Hat 4.0.0-2) To install I did: 1) DL'ed and untarred boost_1_32_0.tar.bz2 2) installed the .rpm'ed boost-jam-3.1.10-i386.rpm 3) chdir boost_1_32_0 4) bjam "-sTOOLS=gcc" install Here I got a bunch of "unknown compiler" messages but the install seemed to go ok other than that. I checked /usr/local/include/boost-32/boost and found all of the .hpp files and subdirs including 'serialization'. I also checked /usr/local/lib and found all of the .so and .a files (The wserialization and serialization .so files were notably absent) I searched all over for the .so files but could not locate them anywhere in my filesystem. I suspect this is the main snag I'm confronting. 5) ln -s /usr/local/include/boost-32/boost /usr/local/include/boost 6) added /usr/local/lib to /etc/ld.so.conf 7) ldconfig Then I tried to compile the source I presented earlier. Any help resolving the resulting errors would be greatly appreciated. Thanks, Mike ____________________________________________________ Sell on Yahoo! Auctions no fees. Bid on great items. http://auctions.yahoo.com/

2 1

serialization of derived classes...
by Filip Peters 07 Jul '05

07 Jul '05

Hi list, I'm using the boost::serialization lib to archive classes in a VC7.1 program. I have a class C, derived from B, derived from (abstract) A now, in serialisation of C, I did: ar & boost::serialization::make_nvp( "baseobject", boost::serialization::base_object<B>( t ) ); This seems to give a memory leak on closing the application. So I tried the following 2 lines: ar & boost::serialization::make_nvp( "baseobject", boost::serialization::base_object<A>( t ) ); ar & boost::serialization::make_nvp( "baseobject2", boost::serialization::base_object<B>( t ) ); and this seemed to work.... What is the correct way of saving C (derived from B which is derived from A)? It seems a bit strange to me that i have to call serialization of A in the ser. of C. Shouldn't B take care of this? thanks, Filip Peters __________________________________ Yahoo! Mail Stay connected, organized, and protected. Take the tour: http://tour.mail.yahoo.com/mailtour.html

2 1

Boost Threads and MFC AfxLoadLibrary
by Greg Kogut 07 Jul '05

07 Jul '05

Hi, I've created a very simple threading program, basically a modification of one of the boost examples. I've successfully compiled and run the program in both Linux and Windows. My next step was to embed the code in a Windows MFC DLL. Again, very simply. A few lines of code. The DLL compiles correctly. However, MFC's AfxLoadLibrary returns FALSE when I try to load the library. Some source code: axisGrabThreadBody grabber(&myimage); //a structure containing code to put in thread boost::thread grab(grabber); //create the boost thread grab.join(); //bind the thread The above fails when trying to load via AfxLoadLibrary. This is before the code is run. It's just when trying to dynamically load at runtime. However: AFX_MANAGE_STATE(AfxGetStaticModuleState()); axisGrabThreadBody grabber(&myimage); //a structure containing code to put in thread //boost::thread grab(grabber); //create the boost thread //grab.join(); //bind the thread Now AfxLoadLibrary correctly loads the DLL. Why is this? Again, the code is not being run. I'm using the latest stable release of Boost, and running Windows XP. Using VC++ 7. Vastly prefer gcc and Emacs to VC++ 7. Any ideas? Thanks, Greg

1 0

Re: [Boost-users] boost::lambda::bind question
by Vishnevetsky, Eugene (IT) 07 Jul '05

07 Jul '05

I came across this problem in the real project where I don't control the class that corresponds to class Y of the example, so I can't change the signature of the member function. I could write a wrapper function that takes Y*, but after some point the code with a simple 'for' loop becomes cleaner and more readable than the one using lambda. If this problem is not a bug, but an inherent limitation of the lambda library or its current implementation, it would be nice if it is mentioned in the documentation. Thanks, Eugene Vishnevetsky Roman Krylov wrote: Perhaps the only solution here is to use Y* instead of Y& with corresponding modifications; this way there is no need for var() or smth similar. Why not? Vishnevetsky, Eugene (IT) wrote: >Is it possible to use boost::ref() or boost::lambda::var() of an >abstract class as a parameter to boost::lambda::bind()? >It seems that compiler attempts to instantiate an object of that >abstract class. >Example: > >----------------- >using namespace boost; >using namespace boost::lambda; >class Y >{ >public: > virtual void foo() = 0; > void foo2 (){ } >}; >class Z : public Y >{ >public: > void foo(){} >}; > >class TT >{ >public: > void test( Y& y ) { y.foo2(); } >}; > >int main() >{ > std::vector<TT> xt; > Z z; > Y &y = z; > std::for_each (xt.begin(), xt.end(), bind(&TT::test,_1, >ref(y))); > return 0; >} >---------------------- > >And Error message from g++ (GCC) 3.2.3: > >--------------------------------- >/boost/tuple/detail/tuple_basic.hpp: In instantiation of >`boost::tuples::cons<Y, boost::tuples::null_type>': >/boost/tuple/detail/tuple_basic.hpp:326: instantiated from >`boost::tuples::cons<boost::tuples::null_type, boost::tuples::cons<Y, >boost::tuples::null_type> >' >/boost/tuple/detail/tuple_basic.hpp:326: instantiated from >`boost::tuples::cons<void (TT::*const)(Y&), >boost::tuples::cons<boost::tuples::null_type, boost::tuples::cons<Y, >boost::tuples::null_type> > >' >/boost/lambda/detail/lambda_functor_base.hpp:151: instantiated from >`boost::lambda::detail::has_null_type<boost::tuples::cons<void >(TT::*const)(Y&), boost::tuples::cons<boost::tuples::null_type, >boost::tuples::cons<Y, boost::tuples::null_type> > > >' >/boost/lambda/detail/lambda_functor_base.hpp:229: instantiated from >`boost::lambda::detail::deduce_non_ref_argument_types<boost::tuples::tu >p >le<void (TT::*const)(Y&), const >boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, Y&, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type>, boost::tuples::null_type>' >/boost/lambda/detail/lambda_functor_base.hpp:412: instantiated from >`boost::lambda::lambda_functor_base<boost::lambda::action<3, >boost::lambda::function_action<3, boost::lambda::detail::unspecified> >>, boost::tuples::tuple<void (TT::*const)(Y&), const >boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, Y&, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type> >::sig<boost::tuples::null_type>' >/boost/lambda/detail/lambda_functors.hpp:135: instantiated from >`boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost : >:lambda::action<3, boost::lambda::function_action<3, >boost::lambda::detail::unspecified> >, boost::tuples::tuple<void >(TT::*const)(Y&), const >boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, Y&, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type, boost::tuples::null_type, >boost::tuples::null_type> > >' >lamtest.cpp:35: instantiated from here >/boost/tuple/detail/tuple_basic.hpp:320: cannot declare field >`boost::tuples::cons<Y, boost::tuples::null_type>::head' >to be >of type `Y' >/boost/tuple/detail/tuple_basic.hpp:320: >because the following virtual functions are abstract: >lamtest.cpp:12: virtual void Y::foo() >---------------------------------------- > >Thanks, > >Eugene Vishnevetsky >-------------------------------------------------------- > >NOTICE: If received in error, please destroy and notify sender. Sender does not waive confidentiality or privilege, and use is prohibited. > >_______________________________________________ >Boost-users mailing list >Boost-users(a)lists.boost.org >http://lists.boost.org/mailman/listinfo.cgi/boost-users <http://lists.boost.org/mailman/listinfo.cgi/boost-users> > > > -------------------------------------------------------- NOTICE: If received in error, please destroy and notify sender. Sender does not waive confidentiality or privilege, and use is prohibited.

4 5

johnson_all_pairs_shortest_paths under MSVC 6.0?
by Vivid Yang 07 Jul '05

07 Jul '05

Hi, Does anybody has experience in applying johnson_all_pairs_shortest_paths under WINDOWS? Examples would help me a lot. I have difficulties in compiling the johnson_all_pairs_shortest_paths example in the library: example/johnson-eg.cpp The code D[id2[*u]-1][id2[*v]-1] = get(d, *v) + get(h, *v) - get(h, *u); has error: "subscript requires array or pointer type" Thanks a lot. Vivid

2 1

[signals] Disconnecting slots
by Staal, J.J. (Joes) 07 Jul '05

07 Jul '05

In the docs for signals, an example is given for disconnecting slots: void foo(); void bar(); signal<void()> sig; sig.connect(&foo); sig.connect(&bar); // disconnects foo, but not bar sig.disconnect(&foo); When I try this with MSV 7.1, I get an compiler error: error C2664: 'boost::signal0<R,Combiner,Group,GroupCompare,SlotFunction>::disconnect' : cannot convert parameter 1 from 'void (__cdecl *)(void)' to 'const boost::signal0<R,Combiner,Group,GroupCompare,SlotFunction>::group_type &' with [ R=boost::detail::function_traits_helper<boost::add_pointer<void (void)>::type>::result_type, Combiner=boost::last_value<void>, Group=int, GroupCompare=std::less<int>, SlotFunction=boost::function<void (void)> ] and [ R=boost::detail::function_traits_helper<boost::add_pointer<void (void)>::type>::result_type, Combiner=boost::last_value<void>, Group=int, GroupCompare=std::less<int>, SlotFunction=boost::function<void (void)> ] My question is, are the docs incorrect, or am I doing something wrong? Regards, Joes. This e-mail and its contents are subject to the DISCLAIMER at http://www.tno.nl/disclaimer/email.html

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