June 2005 - Boost-users - lists.preview.boost.org

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

1 0

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

2 1

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

3 2

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

2 1

date_time: << operator for time_duration
by Donato Petrino 16 Jun '05

16 Jun '05

Hello, one short question regarding the 'operator<<' on time_durations (which in turn calls 'duration_put' in time_formatting_streams.hpp): The stream's filler is changed via the manipulator 'std::setfill' to zero ('0'), but without setting it back to the one the stream had when entering to this function (in my case blank (' ')). This results in undesired leading blanks on the subsequent usage of the same stream object. Question: Is it a bug or is it the common way how streams are used (which would mean that is't up to me resetting it to blank again). Thank you in advance! -- Donato Petrino

2 1

Random numbers: problem with uniform_real random distribution
by Dave Steffen 15 Jun '05

15 Jun '05

Hi Folks, I'm getting some very odd results out of the random uniform_real distribution. The distribution uniform_real<> rdouble (-1, 3); returns a sequence of number that looks like 1.28327e+10 2.34686e+09 1.29337e+10 1.25118e+10 1.54783e+10 1.13449e+10 which certainly doesn't meet the requirement of returning values in [-1,3)! I don't see any mention of this on the bug tracker; has anyone else seen this? ---------------------------------------------------------------------- Dave Steffen, Ph.D. "There are two ways to write error-free Software Engineer IV programs; only the third one works." Numerica Corporation ph (970) 419-8343 x27 "Pie are not square. Pie are round. fax (970) 223-6797 Cornbread are square" dgsteffen(a)numerica.us ... anon (usenet)

1 0

Re: [Boost-users] Reference information for mpl::for_each
by Stephen Gross 15 Jun '05

15 Jun '05

>Maybe > template <class Sequence, class T> struct contains_convertible_type : mpl::not_< boost::is_same< typename mpl::find_if< type_sequence , boost::is_convertible<T,_1> >::type , typename mpl::end<Sequence>::type > > {}; Cool--thanks for the info; I'll work on it... Thanks, --Steve

2 1

Boost.mpl suggestion: variation of find_if
by Vyacheslav Kononenko 15 Jun '05

15 Jun '05

Hi, I could not come with usable name for such thing but it could be usable anyway. So it is like find_if but applies a function to an sequence and return first non void type that function returned. So implementation would be trivial: template< typename Sequence, typename Func > struct find_type : fold< Sequence, void_, if_< is_void_< _1 >, Func< _2 >, _1 > {}; If it can be implemented by current set of algorithms please point me out. Regards, Vyacheslav

3 4

fatal error LNK1104: cannot open file 'libboost_regex-vc71-sgd-1_32.lib'
by John Lucas 15 Jun '05

15 Jun '05

Hi boost New to C++ and boost so please bear with me. I have downloaded the boost library (1.3.2) from sf.net on to a Windows XP platform running Visual Studio .NET. I've started a C++ project however when I compile it, having added the regex class, I get the following error: fatal error LNK1104: cannot open file 'libboost_regex-vc71-sgd-1_32.lib' I have include the lib path for boost and that worked OK with the other libraries but not this one. Any one got any ideas? John Lucas Director of Operations MI International UK Tel: +44 (0)1642 356138 Mobile: +44 (0)7884 181828 Email: <mailto:john.lucas@mi-int.com> john.lucas(a)mi-int.com URL: <http://www.mi-int.com/> www.mi-int.com <http://www.mi-int.com/images/logo3.JPG> First for European POI and business data In association with D&B DISCLAIMER: this email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error, please notify the system manager. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the company. If you are not the intended recipient, please email postmaster(a)mi-int.com, along with a copy of the email. Finally, the recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. E&OE

3 5

Re: [Boost-users] fatal error LNK1104: cannot open file'libboost_regex-vc71-sgd-1_32.lib'
by Marcin Tustin 15 Jun '05

15 Jun '05

The readmes do say, but briefly, get bjam from the boost sourceforge site, and run it in the boost root directory. Alternatively, there may well be project files for use with visual studio available for regex inside the boost distribution. > -----Original Message----- > From: John Lucas [mailto:john.lucas@mi-int.com] > Sent: 14 June 2005 22:43 > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] fatal error LNK1104: cannot open > file'libboost_regex-vc71-sgd-1_32.lib' > > Build the libraries? I understand what that means. How do I do that? > ________________________________ > > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Victor A. Wagner Jr. > Sent: 14 June 2005 21:34 > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] fatal error LNK1104: cannot open > file 'libboost_regex-vc71-sgd-1_32.lib' > > > At 07:37 2005-06-14, John Lucas wrote: > > > Hi boost > > New to C++ and boost so please bear with me. > > I have downloaded the boost library (1.3.2) from sf.net > on to a Windows XP platform running Visual Studio .NET. I've > started a C++ project however when I compile it, having added > the regex class, I get the following error: > > fatal error LNK1104: cannot open file > 'libboost_regex-vc71-sgd-1_32.lib' > > I have include the lib path for boost and that worked > OK with the other libraries but not this one. Any one got any ideas? > > > did you build the boost libraries for your > compiler(apparently VC++7.1)? > > > > > > > > > > John Lucas > Director of Operations > MI International > UK > Tel: +44 (0)1642 356138 > Mobile: +44 (0)7884 181828 > Email: john.lucas(a)mi-int.com <mailto:john.lucas@mi-int.com> > URL: www.mi-int.com <http://www.mi-int.com/> > > > > > > First for European POI and business data > > > > > > In association with D&B > > > > > > DISCLAIMER: this email and any files transmitted with > it are confidential and intended solely for the use of the > individual or entity to whom they are addressed. If you have > received this email in error, please notify the system > manager. Please note that any views or opinions presented in > this email are solely those of the author and do not > necessarily represent those of the company. If you are not > the intended recipient, please email postmaster(a)mi-int.com, > along with a copy of the email. Finally, the recipient should > check this email and any attachments for the presence of > viruses. The company accepts no liability for any damage > caused by any virus transmitted by this email. E&OE > > > > > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > Victor A. Wagner Jr. http://rudbek.com > <http://rudbek.com/> The five most dangerous words in the > English language: > "There oughta be a law" > >

1 0

Re: [Boost-users] fatal error LNK1104: cannot open file'libboost_regex-vc71-sgd-1_32.lib'
by Marcin Tustin 15 Jun '05

15 Jun '05

This probably means that you haven't compiled the library corresponding to your current setup. If the autolinking not choosing the library compiled with the right settings (i.e. you've decided that you know better than boost what to link to), you could modify the regexp headers to not do autolinking (search for inclusion of autolink.hpp), and configure your project to link against the right lib. > -----Original Message----- > From: John Lucas [mailto:john.lucas@mi-int.com] > Sent: 14 June 2005 15:37 > To: boost-users(a)lists.boost.org > Subject: [Boost-users] fatal error LNK1104: cannot open > file'libboost_regex-vc71-sgd-1_32.lib' > > Hi boost > > New to C++ and boost so please bear with me. > > I have downloaded the boost library (1.3.2) from sf.net on to > a Windows XP platform running Visual Studio .NET. I've > started a C++ project however when I compile it, having added > the regex class, I get the following error: > > fatal error LNK1104: cannot open file > 'libboost_regex-vc71-sgd-1_32.lib' > > I have include the lib path for boost and that worked OK with > the other libraries but not this one. Any one got any ideas? > > > > > > > John Lucas > Director of Operations > MI International > UK > Tel: +44 (0)1642 356138 > Mobile: +44 (0)7884 181828 > Email: john.lucas(a)mi-int.com <mailto:john.lucas@mi-int.com> > URL: www.mi-int.com <http://www.mi-int.com/> > > <http://www.mi-int.com/images/logo3.JPG> > > > > First for European POI and business data > > > In association with D&B > > > DISCLAIMER: this email and any files transmitted with it are > confidential and intended solely for the use of the > individual or entity to whom they are addressed. If you have > received this email in error, please notify the system > manager. Please note that any views or opinions presented in > this email are solely those of the author and do not > necessarily represent those of the company. If you are not > the intended recipient, please email postmaster(a)mi-int.com, > along with a copy of the email. Finally, the recipient should > check this email and any attachments for the presence of > viruses. The company accepts no liability for any damage > caused by any virus transmitted by this email. E&OE > > >

1 0

Re: [Boost-users] How to inherit from boost::multi_array
by Sohail Somani 14 Jun '05

14 Jun '05

-----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Yan Zhang Sent: Tuesday, June 14, 2005 4:07 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] How to inherit from boost::multi_array Hi Ron, I finally got it work by using static_cast. But I ran into another problem as you pointed out early that you have to define dimension before you use assignment and copy constructor. That makes the whole thing quit complicated. Any suggestion? Thanks. Yan Revisit inheritance?

1 0

Re: [Boost-users] How to inherit from boost::multi_array
by Yan Zhang 14 Jun '05

14 Jun '05

Hi Ron, I finally got it work by using static_cast. But I ran into another problem as you pointed out early that you have to define dimension before you use assignment and copy constructor. That makes the whole thing quit complicated. Any suggestion? Thanks. Yan _____ From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Ronald Garcia Sent: Tuesday, June 14, 2005 2:28 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] How to inherit from boost::multi_array Use static_cast, rather than const_cast. Cheers, ron On Jun 13, 2005, at 11:14 AM, Yan Zhang wrote: Hi Ron, How do you "cast "other" to the multi_array type" here? I used Array (const Array& other) : boost::multi_array<double,2>( const_cast<const boost::multi_array<double,2>& > other) { } And it failed to compile. Thank for your help, YanI'm read the posting by Thomas and replay by Ronald on how to inherit from boost::multi_array as following: On Oct 2, 2004, at 10:26 AM, Thomas Mensch wrote: Dear List, I am using boost 1.31.0 on Linux (with gcc 3.3.2)I would like to create a 2D array class, which inherits fromboost::multi_array<double, 2> class. However I have problemswith the copy constructor of my class Array. Below is the code,which I am trying to run.

1 0

Reference information for mpl::for_each ?
by Stephen Gross 14 Jun '05

14 Jun '05

(1) Where can I find reference information for mpl::for_each (I've looked around on the boost website and can't seem to find it). (2) Here's what I'm trying to do: I've got an mpl::vector. Given some type T, I want to loop across the vector and see if T is convertible to any of the types in the vector. I tried something like 'for_each<typelist, is_convertible<T, _1> >()' but my syntax is definitely wrong. Any ideas? Thanks in advance, --Steve Stephen Gross Case Western School of Medicine Cleveland, OH "By Grabthar's hammer, by the sons of Worvan, you shall be avenged." - Dr. Lazarus

4 3

Re: [Boost-users] How to inherit from boost::multi_array
by Yan Zhang 14 Jun '05

14 Jun '05

Hi Ron, How do you "cast "other" to the multi_array type" here? I used Array (const Array& other) : boost::multi_array<double,2>( const_cast<const boost::multi_array<double,2>& > other) { } And it failed to compile. Thank for your help, Yan _____ From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Ronald Garcia Sent: Monday, June 13, 2005 7:54 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] How to inherit from boost::multi_array Greetings Yan, I do not recall the context of the problem you describe below, but It appears that the definition: Array (const Array& other) : boost::multi_array<double, 2> (other) {} is the problem. the above expression will call the templated constructor. I believe that the solution here is to cast "other" to the multi_array type. That should result in the proper constructor call. HTH, ron On Jun 6, 2005, at 12:09 PM, Yan Zhang wrote: I'm read the posting by Thomas and replay by Ronald on how to inherit from boost::multi_array as following: On Oct 2, 2004, at 10:26 AM, Thomas Mensch wrote: Dear List, I am using boost 1.31.0 on Linux (with gcc 3.3.2)I would like to create a 2D array class, which inherits fromboost::multi_array<double, 2> class. However I have problemswith the copy constructor of my class Array. Below is the code,which I am trying to run.

2 1

static link of boost.thread requires link to static runtime ?
by Seb Martel 14 Jun '05

14 Jun '05

Hi- I am trying to static link to boost.thread 1.32 (winXP) and I see it requires the runtimes to be linked static as well (#define _DLL mustn't be defined). I want to use the dynamic runtimes, but static link boost.thread. Is this possible ? What prevents it if not ? Thanks, -seb

1 1

Serialization - compile warnings with with text_iarchive.hpp and demo.cpp
by Ken Roser 14 Jun '05

14 Jun '05

When compiling demo.cpp I get the warnings: /home/test/boost/include/boost-1_32/boost/archive/detail/common_iarchive.hpp: In member function `void boost::archive::detail::common_iarchive<Archive>::init() [with Archive = boost::archive::text_iarchive]': /home/test/boost/include/boost-1_32/boost/archive/text_iarchive.hpp:69: instantiated from `boost::archive::text_iarchive_impl<Archive>::text_iarchive_impl(std::istream&, unsigned int) [with Archive = boost::archive::text_iarchive]' /home/test/boost/include/boost-1_32/boost/archive/text_iarchive.hpp:82: instantiated from here /home/test/boost/include/boost-1_32/boost/archive/detail/common_iarchive.hpp:75: warning: choosing `boost::archive::version_type::operator unsigned int&()' over ` boost::archive::version_type::operator unsigned int() const' /home/test/boost/include/boost-1_32/boost/archive/detail/common_iarchive.hpp:75: warning: for conversion from `boost::archive::version_type' to `unsigned int' /home/test/boost/include/boost-1_32/boost/archive/detail/common_iarchive.hpp:75: warning: because conversion sequence for the argument is better I'm using this compiler: g++ (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-52) I'd like a way to silence these warnings assuming this isn't a problem on my system. I apologize if this was discussed previously, but I couldn't find any means to search the mailing list archive.

2 1

bug on /libs/graph/doc/quick_tour.html
by martin f krafft 14 Jun '05

14 Jun '05

The first bit of sample code in the section "Adding Some Color to your Graph" on http://www.boost.org/libs/graph/doc/quick_tour.html does not compile. Graph G(num_nodes, edges, edges + sizeof(edges) / sizeof(E), weights); --> there seems to be no corresponding constructor. I am still fighting to find the proper solution and will followup when I find something. -- martin; (greetings from the heart of the sun.) \____ echo mailto: !#^."<*>"|tr "<*> mailto:" net@madduck invalid/expired pgp subkeys? use subkeys.pgp.net as keyserver! spamtraps: madduck.bogus(a)madduck.net "you don't sew with a fork, so I see no reason to eat with knitting needles." -- miss piggy, on eating chinese food

2 1

Boost.Thread : catching all exceptions
by Adrian Mawbey 13 Jun '05

13 Jun '05

Hi folks. Apologies if this has been discussed frequently before. I'm puzzled as to why the boost.thread thread_proxy function catches all exceptions and then quietly ends the thread. For example:- class MyThreadFunctor { public: void operator()() const { // Do some processing... throw very_bad_exception(); // ...never get to do some processing. } }; int main(int argc, char * argv[]) { MyThreadFunctor my_functor; boost::thread my_thread(my_functor); // Do lots of processing and then join to my_thread. // ... } In boost 1.32, the exception that is thrown in the created thread is caught in the library's thread_proxy function and then the thread exits quietly. Is there a compelling reason for this behaviour? >From my point of view, it seems more flexible to not catch exceptions in the thread_proxy function. If I wanted to, I could still get the current behaviour by putting a try/catch-all block in the operator() function. I would have expected the normal C++ uncaught exception actions (i.e. calling terminate()) to occur if an exception is thrown out of the user provided thread code. I noticed this when (oh horror!) an error in my code threw an exception out of operator(). I could have identified where the problem was from the core file or Dr Watson log that would have been created if the exception had not been caught by thread_proxy(). Am I missing something obvious here? Thanks, Adrian.

1 0

Tokenizer Question
by Tom Browder 13 Jun '05

13 Jun '05

I have used my own C++ tokenizer in the past, but I would like to use Boost's instead. The predominant use of tokenizing for me is to split on white space, but Boost's default is to use white space AND punctuation. Is there any possibility to have either the default changed, or another TokenizerFunction added such as ws_separator, or something similar? I know I can use boost::char_separator<char> sep(" \n\t"); (but do I need to add "\v" to the char set?) but I would rather have something like boost::ws_separator sep; and, better, make the ws_separator be the default TokenizerFunction for tokenizer. Thanks for listening. Tom Browder

2 2

Text_archives don't support integer types?
by Marcin Tustin 13 Jun '05

13 Jun '05

I'm using the CVS version of Boost from 2005-06-06, and it seems that text archives don't support anything except strings, characters, and the like, specifically not integer types like int. I've grepped the archive includes, and it seems that there are no save methods specified for the integer types (except char) by the text archives, and I get compiler errors like: c:\D2\API\NewClient\EnhancedMessageHandler.h(370) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'int' (or there is no acceptable conversion) (with VC7.1) It works when the RHS of << is a variable, but not when it is a function. I take it that this is because with variables, a string is automatically constructed to wrap the int types. This is very confusing, and might well be worth mentioning in the docs. Marcin Tustin IT Innovation Centre 2 Venture Road Chilworth Science Park Southampton, SO16 7NP, UK tel: +44 23 8076 0834 fax: +44 23 8076 0833 mailto:mt@it-innovation.soton.ac.uk http://www.it-innovation.soton.ac.uk

2 1

qualified name error on vc7-stlport
by Johannes Strömberg 13 Jun '05

13 Jun '05

Hi, I am trying to build boost for vc7-stlport (stlport version 4.6.2) and I get most libraries to compile but when compiling the date_time library I get errors like the following: C:\wspace\dev\ssdk\ssdk\stlport\src\stlport\stl\_iterator_base.h(98) : error C2825: '_Iterator::iterator_category': cannot form a qualified name C:\wspace\dev\ssdk\ssdk\boost\src\boost\date_time\date_parsing.hpp(252) : see reference to class template instantiation '_STL::iterator_traits<_Iterator>' being compiled with [ _Iterator=_STL::basic_string<char,_STL::char_traits<char>,_STL::allocator<char>>::iterator ] C:\wspace\dev\ssdk\ssdk\boost\src\boost\date_time\gregorian\parsers.hpp(73) : see reference to function template instantiation 'boost::date_time::period<point_rep,duration_rep> boost::date_time::from_simple_string_type<boost::gregorian::date,char>(const _STL::basic_string<_CharT,_Traits,_Alloc> &)' being compiled with [ point_rep=boost::gregorian::date, duration_rep=boost::gregorian::date_duration, _CharT=char, _Traits=_STL::char_traits<char>, _Alloc=_STL::allocator<char> ] C:\wspace\dev\ssdk\ssdk\stlport\src\stlport\stl\_iterator_base.h(98) : error C2039: 'iterator_category' : is not a member of 'operator``global namespace''' C:\wspace\dev\ssdk\ssdk\stlport\src\stlport\stl\_iterator_base.h(98) : fatal error C1507: previous user errors and subsequent error recovery halt further compilation I know it has to do with a compiler deficiency but how can I fix it? /Johannes

1 0

multi_array operator= and copy constructor have problem
by Yan Zhang 13 Jun '05

13 Jun '05

I'm testing multi_array with a simple example: typedef boost::multi_array<double, 3> array; array A(boost::extents[3][4][2]); A[0][0][0] = 3.14; array B; B = A; When execute the last statement B=A, you encounter assertion: assert(std::equal(other.shape(),other.shape()+this->num_dimensions(), this->shape())); in file multi_array_ref.hpp (line 476). I used VC++ 7.1 with debug build. Please advice.

2 1

Re: [Boost-users] How to inherit from boost::multi_array
by Yan Zhang 13 Jun '05

13 Jun '05

I'm read the posting by Thomas and replay by Ronald on how to inherit from boost::multi_array as following: On Oct 2, 2004, at 10:26 AM, Thomas Mensch wrote: Dear List, I am using boost 1.31.0 on Linux (with gcc 3.3.2) I would like to create a 2D array class, which inherits from boost::multi_array<double, 2> class. However I have problems with the copy constructor of my class Array. Below is the code, which I am trying to run. #include <boost/multi_array.hpp> class Array : public boost::multi_array<double,2> { public: Array (void) : boost::multi_array<double, 2> () {} Array (const int nrow, const int ncol) : boost::multi_array<double, 2> (boost::extents[nrow][ncol]) {} Array (const Array& other) : boost::multi_array<double, 2> (other) {} ~Array (void) {} Array& operator= (const Array& rhs) { if (&rhs != this) { boost::multi_array<double, 2>::operator= (rhs); } return *this; } }; /* class Array */ Ronald's replay: Greetings Thomas, Though you did not supply the error message from your compiler, I suspect that the problem is this: multi_array has a templated constructor of the form: template <class T> multi_array(T const&); that will match your Array type better than the constructor with the signature: multi_array(multi_array<double,2> const&); In short, overload resolution is not selecting the constructor that you desire. You'll need to coerce your Array reference to a multi_array<double,2> reference before passing it to the constructor. Hope this helps. I had the same problem as Thomas'. I don't quit understand Ronald's comment. How to you overload template <class T> multi_array(T const&) instead of multi_array(multi_array<double,2> const&)? I thought Thomas' code is overloading template <class T> multi_array(T const&). Thanks in advance, Yan

2 1

[BGL] edge_index_t
by martin f krafft 13 Jun '05

13 Jun '05

I see the edge_index_t symbol used all over the place, but I cannot find its defintion. So now I am stuck: error: `egde_index_t' undeclared in namespace `boost' What header file do I have to include to be able to access my graph's edge index property? -- martin; (greetings from the heart of the sun.) \____ echo mailto: !#^."<*>"|tr "<*> mailto:" net@madduck invalid/expired pgp subkeys? use subkeys.pgp.net as keyserver! spamtraps: madduck.bogus(a)madduck.net echo '9,J8HD,fDGG8B@?:536FC5=8@I;C5?@H5B0D@5GBIELD54DL>@8L?:5GDEJ8LDG1' |\ sed ss,s50EBsg | tr 0-M 'p.wBt SgiIlxmLhan:o,erDsduv/cyP'

2 2