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serialization with hash_map problem
by Van Kincaid 12 Jul '06

12 Jul '06

Hi, I just started learning to use serialization and having problems with compiling for hash_map (map/deque/etc all work fine for me). I found your discussion a while ago relating to this http://thread.gmane.org/gmane.comp.lib.boost.user/12609/focus=12609 So I built my test program with g++ -D__GLIBCPP__ -DBOOST_HAS_HASH -DBOOST_STD_EXTENSION_NAMESPACE=__gnu_cxx -c test.cpp -o test.o And I still have the following compile errors saying that serialize function for hash_map is not defined. I also looked at the preprocessor output and did find the definition for hash_map serialize() function. It doesn't make sense to me why this happens. Any help is greatly appreciated. The test file is attached at the end. /usr/local/include/boost/serialization/access.hpp: In static member function 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = __gnu_cxx::hash_map<int, boost::shared_ptr<DaoData>, __gnu_cxx::hash<int>, std::less<int>, std::allocator<boost::shared_ptr<DaoData> > >]': /usr/local/include/boost/serialization/serialization.hpp:81: instantiated from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = __gnu_cxx::hash_map<int, boost::shared_ptr<DaoData>, __gnu_cxx::hash<int>, std::less<int>, std::allocator<boost::shared_ptr<DaoData> > >]' /usr/local/include/boost/serialization/serialization.hpp:140: instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = __gnu_cxx::hash_map<int, boost::shared_ptr<DaoData>, __gnu_cxx::hash<int>, std::less<int>, std::allocator<boost::shared_ptr<DaoData> > >]' /usr/local/include/boost/archive/detail/oserializer.hpp:148: instantiated from 'void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive, T = __gnu_cxx::hash_map<int, boost::shared_ptr<DaoData>, __gnu_cxx::hash<int>, std::less<int>, std::allocator<boost::shared_ptr<DaoData> > >]' test.cpp:157: instantiated from here /usr/local/include/boost/serialization/access.hpp:109: error: 'class __gnu_cxx::hash_map<int, boost::shared_ptr<DaoData>, __gnu_cxx::hash<int>, std::less<int>, std::allocator<boost::shared_ptr<DaoData> > >' has no member named 'serialize' ----------------------------------- test.cpp #include <fstream> #include <map> #include <iostream> #include <ext/hash_map> #include <boost/serialization/shared_ptr.hpp> #include <boost/serialization/map.hpp> #include <boost/serialization/hash_map.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/serialization.hpp> using namespace std; using namespace __gnu_cxx; using namespace boost; using namespace boost::serialization; template<typename DataType, typename KeyType, typename CompareType> class DAO { friend class serialization::access; public: typedef shared_ptr<DataType> DataTypePtr; typedef pair<KeyType, DataTypePtr> KeyDataPair; #if 0 typedef map<KeyType, DataTypePtr> DataTypeMap; #else typedef hash_map<KeyType, DataTypePtr, hash<KeyType>, CompareType> DataTypeMap; #endif typedef typename DataTypeMap::iterator DataTypeMapIter; typedef typename DataTypeMap::const_iterator DataTypeMapConstIter; DAO() {} ~DAO() {} template <class Archive> void serialize( Archive& ar, const unsigned int version ) { ar & m_dataTypeMap; } void insertData( DataTypePtr dataPtr ) { m_dataTypeMap.insert( KeyDataPair( dataPtr->getKey(), dataPtr ) ); } void display() const { DataTypeMapConstIter iter = m_dataTypeMap.begin(); while ( iter != m_dataTypeMap.end() ) { iter->second->display(); iter++; } } void save_binary( const char* filename ) { ofstream ofs(filename); archive::text_oarchive oa(ofs); oa & *this; } bool load_binary( const char* filename ) { try { ifstream ifs( "test.dat", ios::binary ); archive::text_iarchive ia( ifs ); ia & *this; display(); return true; } catch ( exception& e ) { cerr << "Exception caught: " << e.what() << endl; return false; } } private: DataTypeMap m_dataTypeMap; }; class DaoData { public: int m_key; string m_keyStr; DaoData() {} DaoData( int key, const string& keyStr ) : m_key( key ), m_keyStr( keyStr ) { } DaoData( DaoData& daoData ) { m_key = daoData.m_key; m_keyStr = daoData.m_keyStr; } ~DaoData() {} int getKey() const { return m_key; } void display() const { cout << "key = " << m_key << endl; cout << "keyStr = " << m_keyStr << endl; } template <class Archive> void serialize( Archive& ar, const unsigned int version ) { ar & m_key; ar & m_keyStr; } }; void test_dao_serialize() { DAO<DaoData, int, less<int> > myDao; shared_ptr<DaoData> dataPtr( new DaoData( 1, "ONE" ) ); myDao.insertData( dataPtr ); shared_ptr<DaoData> dataPtr2( new DaoData( 2, "TWO" ) ); myDao.insertData( dataPtr2 ); myDao.save_binary( "test.dat" ); //myDao.load_binary( "test.dat" ); } int main() { test_dao_serialize(); return 0; }

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Re: [Boost-users] shared_ptr implicit dynamic cast
by Andrew Holden 12 Jul '06

12 Jul '06

Scott McMurray wrote > My apologies, I didn't know that. Certainly a very nice feature as it > means that even without the virtual destructor both would be safe. > > Promises to double-check the documentation before replying next time, No worries. It wasn't exactly a highly advertised feature. Besides, the note implied that older versions of shared pointer didn't do that, so I just figured you learned about shared pointers before they added it. Andrew

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Re: [Boost-users] shared_ptr implicit dynamic cast
by Andrew Holden 12 Jul '06

12 Jul '06

foo = boost::shared_ptr<Foo>(new Bar); foo = boost::shared_ptr<Bar>(new Bar); Scott McMurray wrote: > > The important difference is in the default deleter. shared_ptr<Foo>'s > default deleter will call delete on a Foo* while shared_ptr<Bar>'s > default deleter will call it on a Bar*. Since your base class's > destructor is virtual, it doesn't make any difference in the example. > If your destructor were non-virtual, then you'd have to use > shared_ptr<Bar>(new Bar) to get the correct destructors called. (But > without any virtual functions, the dynamic casting wouldn't compile.) Are you sure about that? A check of the documentation lists the signature for that constructor as template<class Y> explicit shared_ptr(Y * p); The explanation is given as follows: [This constructor has been changed to a template in order to remember the actual pointer type passed. The destructor will call delete with the same pointer, complete with its original type, even when T does not have a virtual destructor, or is void. The reset function has a similar signature.

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shared_ptr implicit dynamic cast
by eric 12 Jul '06

12 Jul '06

hello given the following class hierarchy class Foo { protected: virtual ~Foo() {} }; class Bar : public Foo {}; and declaration boost::shared_ptr<Foo> foo; is there any difference between the two assignment statements below? foo = boost::shared_ptr<Foo>(new Bar); foo = boost::shared_ptr<Bar>(new Bar); in other words, when you assign a value to a shared_ptr, does it make any difference what class you specify for that value, as long as the class of the underlying object can be dynamically cast to the class that was used to declare the shared_ptr? kind regards, eric

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Boost tests
by kirill.sukhonosenko 12 Jul '06

12 Jul '06

Hello, Are there any ready-to-use tests for boost which can be ran after build to prove consistency of the built libraries? I've tried to build several versions of Boost for TI DaVinci chip (ARM core) and failed. Both 1-31 & 1-33 versions failed. Some libraries has got built, some - not. How can one be assured that built libraries work properly? Thanks, Kirill

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boost [C++ database development library]
by Sundaram Ramasamy 12 Jul '06

12 Jul '06

Hi, Can someone help me to locate cross-platform (platform independant) and cross-database C++ database development BOOST library? Thanks and regards, Sundaram Ramasamy Sundaram.Ramasamy(a)saama.com

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fs::exists() question
by Simon Lacroix 11 Jul '06

11 Jul '06

Hello all, I started using the file system about a week ago in order to port a Windows application using win API calls to manipulate folders and file on Linux. So far it works great but I am having one issue, the fs::exists() function seems to throw an exception when I try to look for directory containing special characters like ./test[0] ./test<1> etc. Is this normal ? I can create directory with these characters using mkdir in Linux so it should be legal names. Any ideas ? Thanks for your time Simon

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c array parameter in resize method of multi_array
by Manuel.Yguel＠inrialpes.fr 11 Jul '06

11 Jul '06

Hi, is there any reason to refuse a resize method for multi_array that accept a C array as parameter ? As long as the resize method just works if the boost::extents parameter has the same dimension as the array to be resized a call like that: typedef boost::multi_array<double, 3> array_type; array_type A( boost::extents[3][4][2] ); ---> A.resize( {6;5;2} ); could be understood as: A.resize( boost::extents[6][5][2] ); without any ambiguity, am I wrong ?

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[graph] remove_if algorithm
by Loïc Joly 11 Jul '06

11 Jul '06

Hello, I'm new to the graph library, but I'm missing some algorithms that I believe are quite low level, and that I expected to find. For instance, I'd like to be able to remove nodes from a graph that meet some criterion. The closest I could find to remove_if was : - Iterate on each node manually: for (tie(vi, viend) = boost::vertices(myGraph) ; vi != viend; ++vi) { if (criterion(vi) { clear_vertex(*vi, myGraph); remove_vertex(*vi, myGraph); } } But I'm afraid of iterator invalidity - Filter, copy, swap: Graph tempGraph; { filtered_graph<Graph, keep_all, Criterion> fg (myGraph, criterion); copy_graph(fg, tempGraph); } copy_graph(tempGraph, myGraph); Will one of my attempts work ? Is there any other solution I missed ? Best regards, -- Loïc

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Re: [Boost-users] erase and iterators
by David Klein 11 Jul '06

11 Jul '06

boost-users-bounces(a)lists.boost.org wrote: > On 7/11/06, David Klein <d.klein(a)ascaron.com> wrote: >> you can use Boost.Lambda for this >> >> #include <boost/lambda/lambda.hpp> >> >> using namespace boost::lambda; >> >> std::vector<int> v; >> ... >> v.erase(std::remove_if(v.begin(), v.end(), 5 == _1)); >> > Shouldn't it be > v.erase( std::remove_if(v.begin(), v.end(), 5 == _1), v.end() > ); as you want to erase the range, not just the single element? > > ~ SWMc > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users <blush> of course, my bad (... actually i blame the heat in our office ;) ) </> -- dave

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