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Generating a unique symbol
by Martin Slater 18 Jun '05

18 Jun '05

Hi there, Is there anything in boost that will generate a guarenteed unique symbol, possibly based on file and line? I've had a look through the preprocessor library but cannot see anything. Strict portabilty is not an issue as my only requirement is for vc7.1. thanks Martin

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Serialization problem in a shared library
by Tapio Vuorinen (JO/LMF) 18 Jun '05

18 Jun '05

Hi, I have a problem with usage of the serialization library in my DLL. I looked through the previous mail threads in this mailing list but I didn't find any solution for my problem there. I use Linux and the boost software version is 1.32.0. My software which uses serialization services is compiled with g++ and build as a shared library. When the library is loaded dynamically at runtime the static instance of the pointer_oserializer template class is not initialized correctly and causes crashing of my software. Maybe the serialization software contains other static instances also but the instance of pointer_oserializer is the one I always meet first when I debug my software. Is there any means to fix this? Or if the initialization problem of static instances within DLL is already fixed in later versions of boost, which of them? Thanks Tapio Vuorinen

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Problem in running the examples
by J Liu 17 Jun '05

17 Jun '05

I installed boost and trying to run the example for string algorithm. How could I make the example find the boost libs? coz it keeps telling me that the header can not be found. "Cannot open include file: 'boost/algorithm/string/trim.hpp': No such file or directory" I am running the example in the original folder. Thank you.

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Question regarding mem_fn or function
by Elisha Berns 17 Jun '05

17 Jun '05

Hi, My imagination fails me here: How can you use boost::mem_fn or boost::function to bind a class member function as a predicate function for use in std::sort? I tried this way and that and so far, nothing. Thanks, Elisha Berns e.berns(a)computer.org

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Failed to compile fstream_test.cpp on VC++ 6.0
by Jason Heyes 17 Jun '05

17 Jun '05

I receive errors when I try to compile fstream_test.cpp using Microsoft Visual C++ 6.0. The first error I receive is this: fstream_test.cpp c:\boost\include\boost-1_32\boost\filesystem\fstream.hpp(29): error C2504: 'basic_filebuf<char,char_traits<char> >': base class undefined c:\projects\examples\fstream_test.cpp(27): see reference to class template instantiation 'boost::filesystem::basic_filebuf<char,char_traits<char> >' being compiled Is there a workaround for this? Thanks.

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serialization problem with strings
by Doug Henry 17 Jun '05

17 Jun '05

I have a custom stream that I am adaptiing to, so I build oarchive and iarchive classes derived from boost::archive::detail::common_xarchive according to the documentation. I have a function that looks like the following to handle the specifics of loading and saving. template<class T> void load(T & t) { // load data... } This seems to work for everything except std::string's. I noticed it when writing out a std::map<std::string, std::string>. The map is handled properly by the boost/serialization/map.hpp routines, but the strings are sent to my load function instead of being handled by boost/serialization/string.hpp. Any insight in to what I could possibly be doing wrong would be greatly appreciated. -doug

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changing variant type in a visitor
by james.jones＠firstinvestors.com 16 Jun '05

16 Jun '05

Is it possible to change a variant's type within a visitor function? What I'd like to do is something like this: typedef boost::make_recursive_variant< int, std::string, std::vector<boost::recursive_variant_> >::type json_t; Then I'd like to be able to write something like this: class vector_assign : public boost::static_visitor<json_t&> { public: vector_assign(int key, const json_t& value); json_t& operator()(int&); json_t& operator()(std::string&); json_t& operator()(vector_t&); private: int key; json_t& value; }; json_t& vector_assign::operator(vector_t& v) { // the canonical case - we assign a value to a slot in the vector if(key>=v.size()) v.reserve(key); v[key] = value; return v; } json_t& map_assign::operator(int& i) { // here we want to discard the int value and convert the variant into a new vector with a single value - but how? } Thanks, - James Jones Administrative Data Mgmt. (v)732-510-1806 375 Raritan Center Pkwy, Suite A (f)732-510-1855 Edison, NJ 08837

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waiting for david_abrahams's lock in /cvsroot/boost/boost/tools/build/test
by Steven T. Hatton 16 Jun '05

16 Jun '05

It looks like there's a hung lock on one of the files in the CVS: waiting for david_abrahams's lock in /cvsroot/boost/boost/tools/build/test It's been over ten minutes since I first hit it, and it has not been released. -- Regards, Steven

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How to check for implicit type conversion WITHOUT checking the source object's interface
by Stephen Gross 16 Jun '05

16 Jun '05

I'm trying to find a way to see if a given object is convertible to std::string, but with certain restrictions. Normally, is_convertible<> would be fine, but in this case it doesn't work for my needs. Here's the situation in more detail. I've got a class Foo with a string conversion operator: class Foo { public: operator std::string () const; }; I want some kind of is_convertible<Foo, std::string> to return FALSE, but something like is_convertible<char*, std::string> to return TRUE. Basically, I want is_convertible to check to see if the target type (std::string) has an implicit constructor taking the input type; I *don't* want is_convertible to check to see if the input type has a conversion-to-target-type function. Is there a way to do this? --Steve

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Serialization: how to serialize c style strings?
by Tom Thorne 16 Jun '05

16 Jun '05

I'm trying to understand how to go about serializing allocated c style string buffers using the serialization library. The example code below gives a compile error (see bottom) "left of '.serialize' must have class/struct/union type" and I don't see how to fix this. Could someone point me in the right direction? In the meantime I'm using std::string, but this doesn't meet my needs. Many thanks for any help. Tom ----------------------------- #include <boost/serialization/string.hpp> #include <fstream> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> template<class T> class test { public: template<class Archive> void serialize(Archive &ar, const unsigned int version) { ar & boost::serialization::make_nvp("p", p); } test() { p = 0; } ~test() { delete p; } explicit test(const T *t) { size_t len = std::char_traits<T>::length(t); p = new T[len+1]; std::char_traits<T>::copy(p, t, len+1); } const T *get() const { return p; } private: T *p; }; void sertest() { test<char> t("Hello"); std::ofstream ofs("test.txt"); boost::archive::text_oarchive oa(ofs); oa << t; ofs.close(); } ------------------------------ ------ Build started: Project: test, Configuration: Debug Win32 ------ Compiling... sertest.cpp c:\Proj\boost\include\boost-1_32\boost\serialization\access.hpp(106) : error C2228: left of '.serialize' must have class/struct/union type type is 'type' c:\Proj\boost\include\boost-1_32\boost\serialization\serialization.hpp(7 8) : see reference to function template instantiation 'void boost::serialization::access::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=type ] c:\Proj\boost\include\boost-1_32\boost\serialization\serialization.hpp(1 21) : see reference to function template instantiation 'void boost::serialization::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=type ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(15 2) : see reference to function template instantiation 'void boost::serialization::serialize_adl<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=type ] c:\Proj\boost\include\boost-1_32\boost\serialization\extended_type_info_ typeid.hpp(100) : while compiling class-template member function '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=type ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(16 3) : see reference to class template instantiation 'boost::archive::detail::oserializer<Archive,T>' being compiled with [ Archive=boost::archive::text_oarchive, T=type ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(16 2) : while compiling class-template member function 'const boost::archive::detail::basic_oserializer &boost::archive::detail::pointer_oserializer<T,Archive>::get_basic_seria lizer(void) const' with [ T=type, Archive=boost::archive::text_oarchive ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(53 0) : see reference to class template instantiation 'boost::archive::detail::pointer_oserializer<T,Archive>' being compiled with [ T=type, Archive=boost::archive::text_oarchive ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\interface_oarchive .hpp(65) : see reference to function template instantiation 'const boost::archive::detail::basic_pointer_oserializer &boost::archive::detail::instantiate_pointer_oserializer<Archive,T>(Arch ive *,T *)' being compiled with [ Archive=boost::ar chive::text_oarchive, T=type ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(33 2) : see reference to function template instantiation 'const boost::archive::detail::basic_pointer_oserializer *boost::archive::detail::interface_oarchive<Archive>::register_type<T>(T *)' being compiled with [ Archive=boost::archive::text_oarchive, T=type ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(33 1) : while compiling class-template member function 'const boost::archive::detail::basic_pointer_oserializer *boost::archive::detail::save_pointer_type<Archive,TPtr>::non_abstract<T >::register_type(Archive &)' with [ Archive=boost::archive::text_oarchive, TPtr=char *, T=type ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(34 9) : see reference to class template instantiation 'boost::archive::detail::save_pointer_type<Archive,TPtr>::non_abstract<T >' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=char *, T=type ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(47 5) : see reference to function template instantiation 'const boost::archive::detail::basic_pointer_oserializer *boost::archive::detail::save_pointer_type<Archive,TPtr>::register_type< T>(Archive &,T &)' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=char *, T=char ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(46 2) : while compiling class-template member function 'void boost::archive::detail::save_pointer_type<Archive,TPtr>::invoke(Archive &,const TPtr)' with [ Archive=boost::archive::text_oarchive, TPtr=char * ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(55 1) : see reference to class template instantiation 'boost::archive::detail::save_pointer_type<Archive,TPtr>' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=char * ] c:\Proj\boost\include\boost-1_32\boost\archive\basic_text_oarchive.hpp(7 1) : see reference to function template instantiation 'void boost::archive::save<Archive,T>(Archive &,const T & )' being compiled with [ Archive=boost::archive::text_oarchive, T=char * ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\interface_oarchive .hpp(80) : see reference to function template instantiation 'void boost::archive::basic_text_oarchive<Archive>::save_override<T>(const T & ,int)' being compiled with [ Archive=boost::archive::text_oarchive, T=char * ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\interface_oarchive .hpp(110) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator <<<T>(const T & )' being compiled with [ Archive=boost::archive::text_oarchive, T=char * ] c:\Proj\boost\include\boost-1_32\boost\serialization\nvp.hpp(58) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator &<T>(T & )' being compiled with [ Archive=boost::archive::text_oarchive, T=char * ] c:\Proj\boost\include\boost-1_32\boost\serialization\access.hpp(106) : see reference to function template instantiation 'void boost::serialization::nvp<T>::serialize<Archive>(Archive &,const unsigned int) const' being compiled with [ T=char *, Archive=boost::archive::text_oarchive ] c:\Proj\boost\include\boost-1_32\boost\serialization\serialization.hpp(7 8) : see reference to function template instantiation 'void boost::serialization::access::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\serialization\serialization.hpp(1 21) : see reference to function template instantiation 'void boost::serialization::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(22 7) : see reference to function template instantiation 'void boost::serialization::serialize_adl<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(22 2) : while compiling class-template member function 'void boost::archive::detail::save_non_pointer_type<Archive,T>::save_only::inv okex(Archive &,const T &)' with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(30 9) : see reference to class template instantiation 'boost::archive::detail::save_non_pointer_type<Archive,T>::save_only' being compiled with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(23 7) : while compiling class-template member function 'void boost::archive::detail::save_non_pointer_type<Archive,T>::invoke(Archive &,const T &)' with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(55 1) : see reference to class template instantiation 'boost::archive::detail::save_non_pointer_type<Archive,T>' being compiled with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\archive\basic_text_oarchive.hpp(7 1) : see reference to function template instantiation 'void boost::archive::save<Archive,T>(Archive &,const T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\interface_oarchive .hpp(87) : see reference to function template instantiation 'void boost::archive::basic_text_oarchive<Archive>::save_override<T>(const T &,int)' being compiled with [ Archive=boost::archive::text_oarchive, T=boost::serialization::nvp<char *> ] c:\Proj\lnp\core\test\sertest.cpp(14) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator &<boost::serialization::nvp<T>>(const boost::serialization::nvp<T> &)' being compiled with [ Archive=boost::archive::text_oarchive, T=char * ] c:\Proj\boost\include\boost-1_32\boost\serialization\access.hpp(106) : see reference to function template instantiation 'void test<T>::serialize<Archive>(Archive &,const unsigned int)' being compiled with [ T=char, Archive=boost::archive::text_oarchive ] c:\Proj\boost\include\boost-1_32\boost\serialization\serialization.hpp(7 8) : see reference to function template instantiation 'void boost::serialization::access::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\serialization\serialization.hpp(1 21) : see reference to function template instantiation 'void boost::serialization::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(15 2) : see reference to function template instantiation 'void boost::serialization::serialize_adl<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\serialization\extended_type_info_ typeid.hpp(100) : while compiling class-template member function '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=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(23 4) : see reference to class template instantiation 'boost::archive::detail::oserializer<Archive,T>' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(23 3) : while compiling class-template member function 'void boost::archive::detail::save_non_pointer_type<Archive,T>::save::invokex( Archive &,const T &)' with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(30 9) : see reference to class template instantiation 'boost::archive::detail::save_non_pointer_type<Archive,T>::save' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(23 7) : while compiling class-template member function 'void boost::archive::detail::save_non_pointer_type<Archive,T>::invoke(Archive &,const T &)' with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\oserializer.hpp(55 1) : see reference to class template instantiation 'boost::archive::detail::save_non_pointer_type<Archive,T>' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\basic_text_oarchive.hpp(7 1) : see reference to function template instantiation 'void boost::archive::save<Archive,T>(Archive &,const T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\interface_oarchive .hpp(80) : see reference to function template instantiation 'void boost::archive::basic_text_oarchive<Archive>::save_override<T>(const T &,int)' being compiled with [ Archive=boost::archive::text_oarchive, T=test<char> ] c:\Proj\boost\include\boost-1_32\boost\archive\detail\interface_oarchive .hpp(105) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator <<<test<T>>(const test<T> &)' being compiled with [ Archive=boost::archive::text_oarchive, T=char ] c:\Proj\lnp\core\test\sertest.cpp(55) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator <<<test<T>>(test<T> &)' being compiled with [ Archive=boost::archive::text_oarchive, T=char ] test - 1 error(s), 0 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped

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