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RE: [Boost-users] Re: Question
by Sliwa, Przemyslaw (London) 12 May '05

12 May '05

Thanks for help, I have an additional question. Does anyone know why the following program gives different output on VC++ 6 and VC++ 2003 NET? It is pretty strange, isn't it? Thanks in advance. Pshemek #include <iostream> #include <cmath> using namespace std; class A { protected: char m_d; }; class B : public A { public: typedef char s; private: unsigned short g; }; class C : public A { public: typedef short unsigned s; private: unsigned d; }; template<bool cond> class Select {}; template<> class Select<true> { static void Statment1(double g) { cout << g*g << endl; } public: static void f(double g) { Statment1(g); } }; template<> class Select<false> { static void Statment2(double g) { cout << sqrt(g) << endl; } public: static void f(double g) { Statment2(g); } }; template<bool cond> void exec() { Select<cond>::f(3.0); } template<class T> void foo() { exec<sizeof(T::s)==sizeof(B::s)>(); exec<sizeof(T::s)==sizeof(C::s)>(); } int main() { foo<B>(); foo<C>(); return 0; } -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Eric Niebler Sent: 11 May 2005 18:37 To: boost-users(a)lists.boost.org Subject: [Boost-users] Re: Question Sliwa, Przemyslaw (London) wrote: > > I would like to write a template which depending on the argument type > does different things. > > For example the pseudo code: > > template <class T, class C> > foo(T& nT, C& nC) > { > // common code; > if(T==C) > // specific code; > ..... > > // again common code; > } > > Can the template meta programming help me in this case? It may. It depends on whether "specific code" compiles when T!=C. If it does, you could do this: template <class T, class C> void foo(T& nT, C& nC) { // common code if(boost::is_same<T,C>::value) { /* specific code */ } // again common code } where is is_same<> is defined in boost/type_traits/is_same.hpp. If "specific code" doesn't compile when T!=C, you need to get fancier. An overloaded helper function is the way to go: template<class T, class C> void specific_code(T&, C&) {} template<class T> void specific_code(T&, T&) { // specific code here } template <class T, class C> void foo(T& nT, C& nC) { // common code specific_code(nT, nC); // again common code } HTH, -- Eric Niebler Boost Consulting www.boost-consulting.com _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -------------------------------------------------------- If you are not an intended recipient of this e-mail, please notify the sender, delete it and do not read, act upon, print, disclose, copy, retain or redistribute it. Click here for important additional terms relating to this e-mail. http://www.ml.com/email_terms/ --------------------------------------------------------

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Boost config compiler file for gcc 4.1
by Michael Hopkins 12 May '05

12 May '05

Hi all My first post to the list as a new Boost user. I'm sure there will be many more! Have just started to use GCC 4.1 tools and get this warning: In file included from /usr/local/include/boost/config.hpp:35, from /usr/local/include/boost/detail/iterator.hpp:53, from /usr/local/include/boost/array.hpp:32, from /home/mwh/Coding/C++/Headers/uo_container.hpp:15, from test2.cpp:16: /usr/local/include/boost/boost/config/compiler/gcc.hpp:92:7: warning: #warning "Unknown compiler version - please run the configure tests and report the results" So I was wondering, does a new config file /usr/local/include/boost/boost/config/compiler/gcc.hpp exist that deals with the latest GCC versions? I'm also not sure what the 'configure tests' are but I'm happy to run them if someone will point me to the relevant documentation. I'm on FreeBSD amd64 if that is of any use. TIA Michael P.S. Please cc repies to me if possible. _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/ _/ _/_/_/ Hopkins Research Ltd _/ _/ _/ _/ _/_/_/_/ _/_/_/ http://www.hopkins-research.com/ _/ _/ _/ _/ _/ _/ _/ _/ 'touch the future' _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/

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Program options
by Stephen Henry 12 May '05

12 May '05

Hi all, I am having a small problem with boost's program options library. In the documentation it states that to parse a command file you are suppose to use the "parse_command_file" function as follows: parse_config_file("example.cfg", desc) When attempting this, my compiler (gcc 3.3.3) issues an error stating: decoder.cpp:61: error: no matching function for call to `parse_config_file( const char[12], boost::program_options::options_description&)' It appears that opposed to calling the constructor for basic_istream the compiler attempts to find a function with char[12] as the first argument. To circumvent this error I can do the follow: Std::ifstream in( "config.cfg" ); Parse_config_file( in, desc ); And it works. I would rather use the first method opposed to the second so is there someway for it to be used instead? Thanks, Stephen

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Socket Library?
by Groleo Marius 12 May '05

12 May '05

Hi. Is the socket library found at: http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?BoostSocket in the boost repository? Cause on my gentoo, it doesn't seem to be installed. -- Regards, Groleo! # touch universe # chmod +rwx universe # ./universe

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Spelling out numbers: One, two, three, etc...
by Chateauneu Remi 12 May '05

12 May '05

Is there any library for spelling out numbers in different languages ? 1: One,Ein,Un 2: Two,Zwei,Deux 3: Three,Drei,Trois ... 97: Ninety-seven,Sieben und neunzig,Quatre-vingt-treize The algorithms are clearly specific to each languages. If it does not exists yet, it would be an interesting cooperation project for the many nationalities of Boost users. -- +++ Lassen Sie Ihren Gedanken freien Lauf... z.B. per FreeSMS +++ GMX bietet bis zu 100 FreeSMS/Monat: http://www.gmx.net/de/go/mail

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Boost.python-Inner class
by pankaj jain 12 May '05

12 May '05

Hi , I have C++ code like class A { class B; --- --- } can any body help me in how I can map inner class for building python module. Thanks __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Can't get "write" to work when using IOStreams with custom streambuf
by Eyal Susser 11 May '05

11 May '05

Hi, Boost is a really neat idea, I wish I had less trouble using it (so embarrasing...). Anyway, here's a streambuf class I wrote using IOStream : class CrIPCStreamOutput : public sink { public: CrIPCStreamOutput(RU8 * pio_pInputStorage , RS32 & pio_nStorageLen) : m_pBuffer(pio_pInputStorage), m_nBufferLen(pio_nStorageLen) { } virtual ~CrIPCStreamOutput() { } void write(const char * s , std::streamsize n) { if(!m_pBuffer) { m_nBufferLen = -1; return; } memcpy(m_pBuffer , s , n); m_nBufferLen = n; return; } private: unsigned char *& m_pBuffer; int & m_nBufferLen; }; In my main, I do: int main() { unsigned char p[256] = {0}; int n = sizeof(p); streambuf_facade<CrIPCStreamOutput> sbo(CrIPCStreamOutput(p , n)); //stream_facade<CrIPCStreamOutput> stro(CrIPCStreamOutput(p , n)); iostream stro(&sbo); stro.write("Hello?" , 6); cout << p << endl; return 0; } But the ouput from cout is an empty string, although when debugging I can see m_pBuffer being copied to. How can I get this to work? The motivation for the whole thing is serialization: I want to serialize a class using the boos.serialization lib, for which I need a stream, which has to have certain properties (not shown here). I need to have the archiver write to a specific buffer. IOStreams should do it (I got the reading side working fine), but how? Thanks.

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Fwd: Re: [Boost-users] Re: Re: Re: Re: Boost serializationanddependencynightmares...
by kauai 11 May '05

11 May '05

Hi Robert et all, Ok details. Now that I am able to compile/link/run using that macro Jeff provided I can move on. Quick summary, for legacy reasons we have a structure called ByteArray passed around everywhere. It is simply a public class like this: class ByteArray { public: unsigned char *pArray; int length; int offset; } On our receiving side we have a piece of code like this: // The function argument(s) have to be like this unfortunately. Also pArray is serialized by the sender with code like this but using binary_oarchive OrderedCollection* OrderedCollection::GetOrderedCollection(ByteArray *pArray) // this is a static method, pArray points to valid heap memory { OrderedCollection *pCollection = NULL; std::string astring ((char*) (pArray->pData), pArray->length + pArray->offset); std::istringstream iss(astring); boost::archive::binary_iarchive ia(iss); // exception here in Windows not Linux, below is the reason and call stack is << BOOST_SERIALIZATION_NVP(pCollection); return pCollection; } Again this works in Linux, and I've run it through Valgrind (a linux tool) with no errors or leaks. If there is a better way to construct a binary input archive I'd like to know, im new to stl classes. I get a std::bad_alloc exception, here is the call stack: cmnTest2.exe!boost::archive::basic_binary_iprimitive<boost::archive::binary_iarchive,std::basic_istream<char,std::char_traits<char> > >::load(std::basic_string<char,std::char_traits<char>,std::allocator<char> > & s={...}) Line 93 C++ > cmnTest2.exe!boost::archive::load_access::load_primitive<boost::archive::binary_iarchive,std::basic_string<char,std::char_traits<char>,std::allocator<char> > >(boost::archive::binary_iarchive & ar={...}, std::basic_string<char,std::char_traits<char>,std::allocator<char> > & t={...}) Line 96 C++ cmnTest2.exe!boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive,std::basic_string<char,std::char_traits<char>,std::allocator<char> > >::load_primitive::invoke(boost::archive::binary_iarchive & ar={...}, std::basic_string<char,std::char_traits<char>,std::allocator<char> > & t={...}) Line 308 + 0xd C++ cmnTest2.exe!boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive,std::basic_string<char,std::char_traits<char>,std::allocator<char> > >::invoke(boost::archive::binary_iarchive & ar={...}, std::basic_string<char,std::char_traits<char>,std::allocator<char> > & t={...}) Line 366 + 0xd C++ cmnTest2.exe!boost::archive::load<boost::archive::binary_iarchive,std::basic_string<char,std::char_traits<char>,std::allocator<char> > >(boost::archive::binary_iarchive & ar={...}, std::basic_string<char,std::char_traits<char>,std::allocator<char> > & t={...}) Line 529 + 0xd C++ cmnTest2.exe!boost::archive::basic_binary_iarchive<boost::archive::binary_iarchive>::load_override<std::basic_string<char,std::char_traits<char>,std::allocator<char> > >() Line 66 + 0x15 C++ cmnTest2.exe!boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive>::load_override<std::basic_string<char,std::char_traits<char>,std::allocator<char> > >() Line 46 C++ cmnTest2.exe!boost::archive::detail::interface_iarchive<boost::archive::binary_iarchive>::operator>><std::basic_string<char,std::char_traits<char>,std::allocator<char> > >(std::basic_string<char,std::char_traits<char>,std::allocator<char> > & t={...}) Line 84 C++ cmnTest2.exe!boost::archive::detail::common_iarchive<boost::archive::binary_iarchive>::init() Line 66 C++ cmnTest2.exe!boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive>::binary_iarchive_impl<boost::archive::binary_iarchive>(std::basic_istream<char,std::char_traits<char> > & is={...}, unsigned int flags=0) Line 60 C++ cmnTest2.exe!boost::archive::binary_iarchive::binary_iarchive(std::basic_istream<char,std::char_traits<char> > & is={...}, unsigned int flags=0) Line 78 + 0x1e C++ cmnTest2.exe!OrderedCollection::GetOrderedCollection(ByteArray * pArray=0x0034c620) Line 111 + 0x14 C++ Thanks, Kauai --- kauai <kauai_diver(a)yahoo.com> wrote: > Date: Wed, 11 May 2005 10:15:34 -0700 (PDT) > From: kauai <kauai_diver(a)yahoo.com> > Subject: Re: [Boost-users] Re: Re: Re: Re: Boost > serializationanddependencynightmares... > To: boost-users(a)lists.boost.org > > > Hi Robert, Jeff, et all, > > Thank you Jeff, using that macro helped, I can now build > with the Microsoft compiler. Now getting some sort of > exception in my serialization code. > > I am looking into that today, have to setup my visual > studio and debugger :) And will get back to you all a > bit > later... > > Thanks, > K > > > --- Robert Ramey <ramey(a)rrsd.com> wrote: > > For what its worth, changes have been made for 1.33 > which > > work better with > > argument dependent lookup as well as two-phase lookup. > > > > I envisioned that the EXPORT marcros be in the class > > header after the class > > declaration. > > > > For export to work properly, the archive includes have > to > > before the class > > heades with EXPORT in them > > > > All serialization traites macros like EXPORT must be > > invoke from the global > > namespace. > > > > Robert Ramey > > > > > > Jeff Flinn wrote: > > > "kauai" <kauai_diver(a)yahoo.com> wrote in message > > > > > > news:20050510182406.59092.qmail@web60712.mail.yahoo.com... > > >> Hi Robert, > > >> > > >> The EXPORT macros were initially inside a namespace, > > >> interesting that it compiled and linked with gcc. > > >> > > >> After fixing this I still have the same problem with > > >> Microsofts compiler. It complains about the same > > thing as > > >> I state below. Is there some include file that I > may > > be > > >> missing? I can send you some code if that helps. > > > > > > I use: > > > > > > #define BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP > > > > > > previous to including any boost serialization > headers. > > I'm not sure > > > it'll solve your issues, but it did with mine with > > VC7.1. > > > > > > Jeff Flinn > > > > > > > > _______________________________________________ > > Boost-users mailing list > > Boost-users(a)lists.boost.org > > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > > > > __________________________________ > Yahoo! Mail Mobile > Take Yahoo! Mail with you! Check email on your mobile > phone. > http://mobile.yahoo.com/learn/mail > Yahoo! Mail Stay connected, organized, and protected. Take the tour: http://tour.mail.yahoo.com/mailtour.html

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Question
by Sliwa, Przemyslaw (London) 11 May '05

11 May '05

All, I have a question with regards more to the C++ than Boost. I would like to write a template which depending on the argument type does different things. For example the pseudo code: template <class T, class C> foo(T& nT, C& nC) { // common code; if(T==C) // specific code; ..... // again common code; } Can the template meta programming help me in this case? Sorry, I have no experice with this and I am just guessing. Do you have any suggestions? Thanks for help, Pshemek -------------------------------------------------------- If you are not an intended recipient of this e-mail, please notify the sender, delete it and do not read, act upon, print, disclose, copy, retain or redistribute it. Click here for important additional terms relating to this e-mail. http://www.ml.com/email_terms/ --------------------------------------------------------

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Re: [Boost-users] Re: Re: Re: Re: Boost serializationanddependencynightmares...
by kauai 11 May '05

11 May '05

Hi Robert, Jeff, et all, Thank you Jeff, using that macro helped, I can now build with the Microsoft compiler. Now getting some sort of exception in my serialization code. I am looking into that today, have to setup my visual studio and debugger :) And will get back to you all a bit later... Thanks, K --- Robert Ramey <ramey(a)rrsd.com> wrote: > For what its worth, changes have been made for 1.33 which > work better with > argument dependent lookup as well as two-phase lookup. > > I envisioned that the EXPORT marcros be in the class > header after the class > declaration. > > For export to work properly, the archive includes have to > before the class > heades with EXPORT in them > > All serialization traites macros like EXPORT must be > invoke from the global > namespace. > > Robert Ramey > > > Jeff Flinn wrote: > > "kauai" <kauai_diver(a)yahoo.com> wrote in message > > > news:20050510182406.59092.qmail@web60712.mail.yahoo.com... > >> Hi Robert, > >> > >> The EXPORT macros were initially inside a namespace, > >> interesting that it compiled and linked with gcc. > >> > >> After fixing this I still have the same problem with > >> Microsofts compiler. It complains about the same > thing as > >> I state below. Is there some include file that I may > be > >> missing? I can send you some code if that helps. > > > > I use: > > > > #define BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP > > > > previous to including any boost serialization headers. > I'm not sure > > it'll solve your issues, but it did with mine with > VC7.1. > > > > Jeff Flinn > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > __________________________________ Yahoo! Mail Mobile Take Yahoo! Mail with you! Check email on your mobile phone. http://mobile.yahoo.com/learn/mail

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