August 2007 - Boost-users - lists.preview.boost.org

[mpl] Is it possible to mpl_assert depending on the derivation of a class
by Hughes, James 21 Aug '07

21 Aug '07

Hello all, I want some template code to assert if the passed in template type is NOT derived from a particular base class. I've looked through the Template Metaprogamming book, but haven't seen anything that can do this, but I seem to remember something along those lines. Can anyone help? James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

4 9

serialization lib, demo_shared_ptr.cpp, XML archives
by Robbie Morrison 21 Aug '07

21 Aug '07

Hello all My problem is similar to that discussed by Phil and Robert Ramey on 'Boost - Users' back in 08-Feb-2007. Their thread was titled "serialization stream error". Phil however did not post back a follow up and it remains unclear as to whether his difficulties were resolved or not. Moreover, these discussions predate the 1.34.1 release on 24-Jul-2007 by about five months. For my part, I have tried solving the problem covered in this email using: - Boost 1.33.1 from an Ubuntu package and dated 05-Dec-2005 - Boost 1.34.1 built from source under Ubuntu 6.10 I would like to get 'demo_shared_ptr.cpp' to run using XML rather than text as the archive format -- as a precursor to integrating this kind of code into an energy system simulation. I decided to use a step-by-step approach: step 1 - build and run the original 'demo_shared_ptr.cpp' using the original text archive format - therefore, remove the leading A:: and B:: from constructor and destructor definitions - comment out the following (two places): oa.register_type(static_cast<boost::detail::sp_counted_base_impl > *>(NULL)); [as far as I could tell 'sp_counted_base_impl' no longer exists] step 2 - add NVP statements while retaining the text archive format for the time being - therefore, swap over all archive calls, for instance: // ar & x; ar & boost::serialization::make_nvp("x", x); step 3 - switch to the XML archive format - duly change the following headers: // #include <boost/archive/text_iarchive.hpp> // #include <boost/archive/text_oarchive.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> - duly change the archive objects: // boost::archive::text_oarchive oa(ofs); boost::archive::xml_oarchive oa(ofs); Step 3 fails but only in the derived pointer code added by David Tonge to 'demo_shared_ptr.cpp'. A 'boost::STATIC_ASSERTION_FAILURE' is generated. Typical error messages are given after the main body of this posting. At this point, I ran out of ideas. I have read the HTML documentation and made my own notes and still can't see a solution. Any assistance would be very gratefully received! Note too that I only log on once per day so don't expect a rapid turn-around for requests for details. In addition, I will send diffs to the maintainer when I get a satisfactory solution. And, in passing, it is material to note that derived class B does not fully archive its state and that there should probably be an "ar & x" statement in its 'serialize' definition. For the record, here is my development environment: os : Ubuntu 6.10, Linux 2.6.17-12-generic hardware : Toshiba Tecra A2 330 laptop (purchased 27-Aug-2004) specs : 1.4GHz Intel Celeron M (32-bit) / 512MiB RAM / 40GB HDD / 1024x76 gcc : gcc (GCC) 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5) I realize that this is not the latest release of Ubuntu, but otherwise my system is fully current. Lastly, I take it Boost.Serialization and TR1 shared pointers (std::tr1::shared_ptr) remain incompatible at this point in development. Many thanks to Robert Ramey for developing Boost.Serialization. It suits my needs to a tee, so I hope I can get this issue resolved and move on with real coding. best wishes Robbie --------------------------------- selected error messages --------------------------------- /usr/local/include/boost-1_34_1/boost/archive/basic_xml_oarchive.hpp: In member function 'void boost::archive::basic_xml_oarchive<Archive>::save_override(T&, int) [with T = const A, Archive = boost::archive::xml_oarchive]': /usr/local/include/boost-1_34_1/boost/archive/detail/interface_oarchive.hpp:79: instantiated from 'Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = const A, Archive = boost::archive::xml_oarchive]' /usr/local/include/boost-1_34_1/boost/archive/detail/interface_oarchive.hpp:87: instantiated from 'Archive& boost::archive::detail::interface_oarchive<Archive>::operator&(T&) [with T = A, Archive = boost::archive::xml_oarchive]' qdemo_shared_ptr.mod01.cpp:76: instantiated from 'void B::serialize(Archive&, unsigned int) [with Archive = boost::archive::xml_oarchive]' /usr/local/include/boost-1_34_1/boost/serialization/access.hpp:109: instantiated from 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::xml_oarchive, T = B]' /usr/local/include/boost-1_34_1/boost/serialization/serialization.hpp:81: instantiated from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::xml_oarchive, T = B]' /usr/local/include/boost-1_34_1/boost/serialization/serialization.hpp:140: instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::xml_oarchive, T = B]' /usr/local/include/boost-1_34_1/boost/archive/detail/oserializer.hpp:225: instantiated from 'boost::archive::detail::pointer_oserializer<T, Archive>::pointer_oserializer() [with T = B, Archive = boost::archive::xml_oarchive]' /usr/local/include/boost-1_34_1/boost/archive/detail/oserializer.hpp:197: instantiated from 'const boost::archive::detail::pointer_oserializer<B, boost::archive::xml_oarchive> boost::archive::detail::pointer_oserializer<B, boost::archive::xml_oarchive>::instance' /usr/local/include/boost-1_34_1/boost/archive/detail/oserializer.hpp:189: instantiated from 'static const boost::archive::detail::pointer_oserializer<T, Archive>& boost::archive::detail::pointer_oserializer<T, Archive>::instantiate() [with T = B, Archive = boost::archive::xml_oarchive]' /usr/local/include/boost-1_34_1/boost/archive/detail/oserializer.hpp:514: instantiated from 'const boost::archive::detail::basic_pointer_oserializer& boost::archive::detail::instantiate_pointer_oserializer(Archive*, T*) [with Archive = boost::archive::xml_oarchive, T = B]' /usr/local/include/boost-1_34_1/boost/archive/detail/interface_oarchive.hpp:59: instantiated from 'const boost::archive::detail::basic_pointer_oserializer* boost::archive::detail::interface_oarchive<Archive>::register_type(const T*) [with T = B, Archive = boost::archive::xml_oarchive]' demo_shared_ptr.mod01.cpp:200: instantiated from here /usr/local/include/boost-1_34_1/boost/archive/basic_xml_oarchive.hpp:83: error: invalid application of 'sizeof' to incomplete type 'boost::STATIC_ASSERTION_FAILURE<false>' --------------------------------- my modifications --------------------------------- $ diff -u demo_shared_ptr.cpp demo_shared_ptr.mod01.cpp --- demo_shared_ptr.cpp 2007-08-21 11:51:35.000000000 +0200 +++ demo_shared_ptr.mod01.cpp 2007-08-21 14:44:33.000000000 +0200 @@ -9,6 +9,21 @@ // // See http://www.boost.org for updates, documentation, and revision history. +// build : $ g++ -ggdb -Wall demo_shared_ptr.mod01.cpp +// -lboost_serialization-gcc41 -o demo_shared_ptr +// run : $ demo_shared_ptr + +// --------------------------------------------------------- +// PREPROCESSOR DIRECTIVES +// --------------------------------------------------------- + +// 0 = text, 1 = text with NPV statements, 2 = xml +#define XEONA_ARCHIVE_MODE 2 +// 0 = omit DT code, 1 = use DT code +#define DT_CODE 1 + +// --------------------------------------------------------- + #include <iomanip> #include <iostream> #include <fstream> @@ -17,15 +32,23 @@ #include <cstdio> // remove #include <boost/config.hpp> #if defined(BOOST_NO_STDC_NAMESPACE) -namespace std{ +namespace std{ using ::remove; } #endif -#include <boost/archive/text_oarchive.hpp> -#include <boost/archive/text_iarchive.hpp> +#if (XEONA_ARCHIVE_MODE >= 2) +# include <boost/archive/xml_oarchive.hpp> +# include <boost/archive/xml_iarchive.hpp> +#else +# include <boost/archive/text_oarchive.hpp> +# include <boost/archive/text_iarchive.hpp> +#endif + #include <boost/archive/tmpdir.hpp> +//#include <boost/serialization/base_object.hpp> // base class serialization + #include <boost/serialization/shared_ptr.hpp> /////////////////////////// @@ -37,12 +60,18 @@ int x; template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */){ - ar & x; + +#if (XEONA_ARCHIVE_MODE >= 1) + ar & boost::serialization::make_nvp("x", x); +#else + ar & x; +#endif + } public: static int count; - A::A(){++count;} // default constructor - virtual A::~A(){--count;} // default destructor + A(){++count;} // default constructor + virtual ~A(){--count;} // default destructor }; BOOST_SERIALIZATION_SHARED_PTR(A) @@ -56,12 +85,18 @@ int x; template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */){ - ar & boost::serialization::base_object<A>(*this); + +#if (XEONA_ARCHIVE_MODE >= 1) + ar & boost::serialization::base_object<A>(*this); // problem +#else + ar & boost::serialization::base_object<A>(*this); +#endif + } public: static int count; - B::B() : A() {}; - virtual B::~B() {}; + B() : A() {}; + virtual ~B() {}; }; BOOST_SERIALIZATION_SHARED_PTR(B) @@ -83,8 +118,30 @@ int main(int argc, char *argv[]) { + std::cout << std::endl; + std::cout << "xeona archive mode : " + << XEONA_ARCHIVE_MODE + << std::endl; + + std::cout << "DT extension mode : " + << DT_CODE + << std::endl; + +#if (XEONA_ARCHIVE_MODE >= 2) + std::string ext = "xml"; +#else + std::string ext = "txt"; +#endif + std::string filename(boost::archive::tmpdir()); filename += "/testfile"; + filename += "."; + filename += ext; + + std::cout << "testfile : " + << filename + << "\n" + << std::endl; // create a new shared pointer to ta new object of type A boost::shared_ptr<A> spa(new A); @@ -94,9 +151,21 @@ // serialize it { std::ofstream ofs(filename.c_str()); + +#if (XEONA_ARCHIVE_MODE >= 2) + boost::archive::xml_oarchive oa(ofs); +#else boost::archive::text_oarchive oa(ofs); +#endif + +#if (XEONA_ARCHIVE_MODE >= 1) + oa << boost::serialization::make_nvp("spa", spa); + oa << boost::serialization::make_nvp("spa1", spa1); +#else oa << spa; oa << spa1; +#endif + } // reset the shared pointer to NULL // thereby destroying the object of type A @@ -108,17 +177,28 @@ { // open the archive std::ifstream ifs(filename.c_str()); + +#if (XEONA_ARCHIVE_MODE >= 2) + boost::archive::xml_iarchive ia(ifs); +#else boost::archive::text_iarchive ia(ifs); +#endif - // restore the schedule from the archive +#if (XEONA_ARCHIVE_MODE >= 1) + ia >> boost::serialization::make_nvp("spa", spa); + ia >> boost::serialization::make_nvp("spa1", spa1); +#else ia >> spa; ia >> spa1; +#endif + } display(spa, spa1); spa.reset(); spa1.reset(); - std::cout << std::endl; +#if (DT_CODE >= 1) + std::cout << std::endl; std::cout << "New tests" << std::endl; @@ -131,17 +211,29 @@ // serialize it { std::ofstream ofs(filename.c_str()); + +#if (XEONA_ARCHIVE_MODE >= 2) + boost::archive::xml_oarchive oa(ofs); +#else boost::archive::text_oarchive oa(ofs); +#endif oa.register_type(static_cast(NULL)); - oa.register_type( - static_cast< - boost::detail::sp_counted_base_impl< - B *, boost::checked_deleter - > * - >(NULL) - ); +// oa.register_type( +// static_cast< +// boost::detail::sp_counted_base_impl< +// B *, boost::checked_deleter +// > * +// >(NULL) +// ); + +#if (XEONA_ARCHIVE_MODE >= 1) + oa << boost::serialization::make_nvp("spa", spa); + oa << boost::serialization::make_nvp("spa1", spa1); +#else oa << spa; oa << spa1; +#endif + } // reset the shared pointer to NULL // thereby destroying the object of type B @@ -153,25 +245,40 @@ { // open the archive std::ifstream ifs(filename.c_str()); + +#if (XEONA_ARCHIVE_MODE >= 2) + boost::archive::xml_iarchive ia(ifs); +#else boost::archive::text_iarchive ia(ifs); +#endif - // restore the schedule from the archive ia.register_type(static_cast(NULL)); - ia.register_type( - static_cast< - boost::detail::sp_counted_base_impl< - B *, boost::checked_deleter - > * - >(NULL) - ); +// ia.register_type( +// static_cast< +// boost::detail::sp_counted_base_impl< +// B *, boost::checked_deleter +// > * +// >(NULL) +// ); + +#if (XEONA_ARCHIVE_MODE >= 1) + ia >> boost::serialization::make_nvp("spa", spa); + ia >> boost::serialization::make_nvp("spa1", spa1); +#else ia >> spa; ia >> spa1; +#endif + } display(spa, spa1); + +#endif // DT code + /////////////// - std::remove(filename.c_str()); + // std::remove(filename.c_str()); // obj of type A gets destroyed // as smart_ptr goes out of scope return 0; } + --- Robbie Morrison PhD student -- policy-oriented energy system simulation Institute for Energy Engineering (IET) Technical University of Berlin (TU-Berlin), Germany University email (redirected) : morrison(a)iet.tu-berlin.de Webmail (preferred) : robbie(a)actrix.co.nz [from IMAP client]

1 0

certain headers missing
by Dragos Sbarlea 21 Aug '07

21 Aug '07

Hello! I am a new Boost user and my question might seem dumb, but please try to help me. I installed boost and I can run the example posted on the boost getting started page successfully, but when I try to use Boost.Process i get an error that the header fiel does not exist. Looking in the boost include files, i see there is no such file as process.hpp and no folder called process ... Where do I do something wrong? (working on Linux with boost from ubuntu 7.04 repos) Thank you for your time! ____________________________________________________________________________________ Be a better Heartthrob. Get better relationship answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545433

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boost assign: insufficent type error.
by chun ping wang 20 Aug '07

20 Aug '07

heres the code. template <class T> class next { public: next(const int& k) : k_(k), count(0) {} std::complex<T> operator()() { return std::complex<T>(((2.0*PI*k_/Random::randint(k_, 2*k_))*(++count)), 0); } private: static const double PI = 3.141592654; int k_; int count; }; when i tried to do boost::assign::list_of<std::complex<T> >.repeat_func(num_elems, next<T>(num_elems)); I get an error about insuffiecnet contextual information to determine type.

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[boost.iostream & Boost Windows Installer 1.34.1] Trouble during linking
by Marc Viala 20 Aug '07

20 Aug '07

Hi, I've recently downloaded the new Boost 1.34.1 Windows Installer and tried to use it but I've met some linking troubles in conjunction with Boost.Iostream & Zlib compression scheme. To explain that, I've just tried to compile w/ VC++7.1 this code snippet: #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/copy.hpp> #include <boost/iostreams/filter/gzip.hpp> #include <iostream> #include <sstream> namespace io = boost::iostreams ; // Zlib compression void compress(std::istream& is, std::ostream& os) { io::filtering_streambuf<io::output> out ; out.push(io::gzip_compressor()) ; out.push(os) ; io::copy(is, out) ; } void main() { } The VC++ linker complains that "boost_zlib-vc71-mt-gd-1_34_1.lib" library can't be opened from the Boost installation library path. I've checked it and didn't find any "boost_zlib*" library in the distribution. I've read the "Getting started documentation" and I've found "no specific configuration" for Boost.Iostream with Zlib. I've surely missed something but... I've also went through the boost user-list archive unsuccessfully. Any help or suggestion will be welcomed Marc Viala

1 0

boost bind beginner throw problem
by Taglioretti Roberto 20 Aug '07

20 Aug '07

Hi, I have a problem with boot bind, in a my class there is this member: void test(int i) throw(Error); If I use bind(&test,obj,_1); I have a compilation error, instead if I change the member in void test(int i); all it works. Could someone help me to use bind with my original member ? I do not understand where is the problem. Thanks SO: windows XP SP2 compiler: VC 7.1 boot version: 1.34.1 -- Roberto *sono affetto da discromatopsia, per favore evitate l'invio di mail o allegati colorati* *I have dyschromatopsia, please do not send coloured text or email and attach*

2 1

ICU and Boost Regex
by Sudarshan Gaikaiwari 20 Aug '07

20 Aug '07

Hello Boost Experts I am trying to use Boost Regex to replace the java.util.regex package. I want to use the Unicode Regular Expressions and need to link with the ICU libraries. However I want to keep the size of my program as small as possible. What components of ICU are essential for Boost regex? What is the ICU configuration that would lead to the smallest ICU binaries that can still be usable by Boost regex? Thanks regards Sudarshan -- Sudarshan Gaikaiwari www.sudarshan.org sudarshan(a)acm.org

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[Fwd: Having trouble with boost thread library]
by Fei Liu 20 Aug '07

20 Aug '07

3 3

serialization - portability
by Stefaan 20 Aug '07

20 Aug '07

Hi! I'm having an issue with archive portability. As I'm quite new to the internals of boost, I hope my attempt at pinpointing the problem is sensible: #include <iostream> #include <boost/serialization/vector.hpp> int main() { std::cerr << boost::serialization::implementation_level <std::vector <long long> >::value << std::endl; return 0; } built on a x86_64 platform prints out "3", on a i386 platform it prints out "2". I tested this both with boost 1.33.1 and 1.34.1. It is my guess that it causes the serialization of the used type to result in a larger archive on x86_64 than on i386. (Which is the original problem that led me to discover this) So my question is: is this the result of a bug in boost? If not, then what is the explanation of this difference? Using linux-2.6 with gcc. Thanks, Stefaan

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Newbie needs yet more help with serialization - BOOST_SERIALIZATION_SPLIT_FREE
by Hector C. 20 Aug '07

20 Aug '07

Hi all, I don't understand why the following code doesn't compile. It gives an strange error: "missing type specifier - int assumed. Note: C++ does not support default-int" Any ideas? --Hector C. #define tpath boost::filesystem::wpath template< class Archive > void save( Archive & x_Stream, const tpath & x_Path, const unsigned int a_Version ) {} BOOST_SERIALIZATION_SPLIT_FREE(tpath) BOOST_CLASS_TRACKING(tpath, boost::serialization::track_never) int wmain(int argc, tchar * argv[]) { tpath tt; std::ofstream off(_T("test.txt"), std::ios_base::binary); boost::archive::binary_oarchive oa((std::ostream &)off); oa << tt; return 0; } ____________________________________________________________________________________ Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase. http://farechase.yahoo.com/

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