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

Boost bind library question
by Meryl Silverburgh 15 Feb '06

15 Feb '06

How can I use boost:bind library to bind to constructor of a class. Right now, I have code like this: class build { public: Rect* operator()(string& str) { return new Rect(str); } }; void TestBlockData::buildRectList( vector<string>& inputs, RectList& bdl) { transform(inputs.begin(), inputs.end(), bdl.begin(), build()); } I wonder if I can get rid of the whole "build class" by using boost::bind library. Thank you.

2 3

using filtering_istream for decompression
by Ed Sykes 15 Feb '06

15 Feb '06

Hi, I'm trying to use a filtering istream with a gzip decompressor attached. I've got it all working but the one part that I am having trouble with is figuring out the most effective way of consuming the decompressed data. I'd like to be able to get hold of all the decompressed data in one go, rather than reading out a word at a time using the >> operator. It seems to me that the most logical way of doing it, given what I have read about the way streams work, would be to use rdbuf() to get the streambuffer and then send that to a stringstream. However when I try this the filtering_istream throws an exception of type boost::iostreams::gzip_error. I do know however that the data integrity is fine since I am able to use >> to push data into a std::string. Instinctively I realise that the filtering_istream doesn't have an internal buffer as such and using the >> operator pulls data from the source, through the decompressor and into the type on the right hand side. This leaves me confused as to what the best way of getting the data out is if I can't use the filtering_istream as a typical stream inheriting from basic_istream. I think that perhaps I'm misunderstanding a fundamental principle of how to use the filtering_istream and I'm hoping that someone on the list can point me in the right direction of how I should achieve a read of all the decompressed data. So does anyone have any idea how I should proceed? I've included the code I have thus far below. Thanks in advance, Ed. >>>> #include "zlib.h" #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/filter/gzip.hpp> #include <boost/iostreams/copy.hpp> #include <strstream> #include <string> namespace io = boost::iostreams; void DecompressIntoStringStream() { unsigned char compressedHTML[] = { 0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xec, 0x7d, 0x7b, 0x77, 0xdb, 0xb6, 0xb2, 0xef, 0xdf, 0xf5, 0x5a, 0xfb, 0x3b, 0x30, 0xca, 0xae, 0x65, 0xd7, 0x7a, 0xbf, 0x6c, 0x4b, 0xa6, 0x7b, 0x1c, 0x3f, 0x92, 0xb4, 0x79, 0x78, 0xc7, 0x4e, 0xb3, 0x7b, 0x7b, 0x7b, 0xb2, 0x28, 0x92, 0xb2, 0x18, 0x53, 0x24, 0x43, 0x52, 0x72, 0x14, 0x27, 0x5f, 0xe3, 0x7e, 0x81, 0xf3, 0x45, 0xef, 0x6f, 0x06, 0x00, 0x09, 0x4a, 0xf2, 0x2b, 0xe9, 0x3e, 0xfb, 0xdc, 0xb5, 0x6e, 0xbb, 0x22, 0x93, 0x20, 0x1e, 0x83, 0xc1, 0x60, 0x30, 0x98, 0x19, 0x0c, 0xf6, 0x1e, 0x1d, 0xbd, 0x3e, 0x3c, 0xff, 0xfd, 0xf4, 0xd8, 0x78, 0x76, 0xfe, 0xf2, 0x85, 0x71, 0xfa, 0xf6, 0xc9, 0x8b, 0xe7, 0x87, 0x46, 0xa9, 0x5a, 0xaf, 0xbf, 0x6b, 0x1f, 0xd6, 0xeb, 0x47, 0xe7, 0x47, 0xe2, 0x43, 0xa7, 0xd6, 0x68, 0x1a, 0xe7, 0xb1, 0x15, 0x24, 0x5e, 0xea, 0x85, 0x81, 0xe5, 0xd7, 0xeb, 0xc7, 0xaf, 0x4a, 0x46, 0x69, 0x9c, 0xa6, 0x51, 0xbf, 0x5e, 0xbf, 0xba, 0xba, 0xaa, 0x5d, 0xb5, 0x6b, 0x61, 0x7c, 0x51, 0x3f, 0x7f, 0x53, 0x1f, 0xa7, 0x13, 0xbf, 0x53, 0xf7, 0xc3, 0x30, 0x71, 0x6b, 0x4e, 0xea, 0x94, 0xf6, 0xd7, 0xf6, 0x28, 0xc9, 0xf0, 0xad, 0xe0, 0xc2, 0x2c, 0xb9, 0x41, 0xf5, 0xe9, 0x13, 0x4e, 0x73, 0x2d, 0x07, 0x9f, 0x12, 0x3b, 0xf6, 0xa2, 0x94, 0x3f, 0x4e, 0xad, 0x0b, 0xd7, 0xfc, 0x60, 0xcd, 0x2c, 0x91, 0xb6, 0xbf, 0x36, 0xb3, 0x62, 0x23, 0x08, 0xaf, 0xcc, 0xc0, 0xbd, 0x32, 0x8e, 0xac, 0xd4, 0xad, 0xa4, 0x4d, 0xb3, 0x51, 0x49, 0x5b, 0xf4, 0xd3, 0xa6, 0x9f, 0x0e, 0xfd, 0x74, 0xe9, 0xa7, 0x87, 0x9f, 0xf7, 0x9e, 0x4b, 0xcf, 0xe3, 0x08, 0x3f, 0x56, 0x88, 0x1f, 0xdb, 0x36, 0xcb, 0xe5, 0xca, 0xdc, 0x8f, 0xf0, 0x67, 0x80, 0xb2, 0xa8, 0xab, 0x76, 0xe1, 0xa6, 0xe7, 0xde, 0xc4, 0xdd, 0xd8, 0x1c, 0x70, 0xf5, 0x33, 0x37, 0x36, 0x4b, 0xcd, 0xd2, 0x60, 0x6d, 0xaf, 0xae, 0x5a, 0xdd, 0x4b, 0xbd, 0xd4, 0x77, 0xf7, 0x7f, 0xb7, 0xc6, 0x61, 0xf8, 0xc8, 0x78, 0xfb, 0xab, 0xb1, 0x6e, 0x4d, 0xa2, 0x81, 0xf1, 0x3c, 0x76, 0xd1, 0x03, 0x67, 0xaf, 0x2e, 0x3e, 0xef, 0x4d, 0xdc, 0xd4, 0x32, 0x08, 0x01, 0x55, 0xf7, 0xe3, 0xd4, 0x9b, 0x99, 0xa5, 0xc3, 0x30, 0x48, 0xdd, 0x20, 0xad, 0x9e, 0xcf, 0x23, 0xb7, 0x64, 0xd8, 0xe2, 0xcd, 0x2c, 0xa5, 0xee, 0xa7, 0x94, 0x71, 0x32, 0x30, 0xec, 0xb1, 0x15, 0x27, 0x6e, 0x6a, 0x7a, 0x49, 0x58, 0xdd, 0xd9, 0xe9, 0xee, 0x56, 0x9b, 0x84, 0x88, 0xa5, 0x8a, 0x4e, 0x9f, 0x1f, 0x9e, 0x55, 0x5f, 0x58, 0x43, 0xd7, 0xcf, 0xab, 0x29, 0x6f, 0x70, 0x6a, 0xb3, 0xd6, 0x2c, 0x60, 0xdd, 0xb3, 0x63, 0x8b, 0xf1, 0x1e, 0x5b, 0xa9, 0x17, 0x5c, 0x24, 0xb3, 0x46, 0xab, 0x46, 0xc8, 0x2e, 0x19, 0xbe, 0x11, 0x1b, 0x1b, 0xf6, 0x67, 0xa3, 0x69, 0xf8, 0xf4, 0x13, 0xd0, 0x4f, 0x48, 0x3f, 0x33, 0xfc, 0x6c, 0x1a, 0x17, 0x6e, 0x60, 0xa4, 0xf1, 0xd4, 0x35, 0x46, 0x61, 0x9c, 0xd5, 0x38, 0xbd, 0xac, 0xcd, 0xa9, 0xd7, 0x35, 0x3b, 0x9c, 0x94, 0x6e, 0x2f, 0xaf, 0x0f, 0x7d, 0x9c, 0x58, 0x76, 0x11, 0x88, 0xa6, 0x0e, 0x44, 0x60, 0x34, 0x8c, 0x04, 0xff, 0x66, 0xf8, 0xe7, 0x1b, 0x8d, 0xfb, 0xb6, 0xbd, 0x58, 0x6c, 0xb3, 0xbc, 0x2f, 0x50, 0x15, 0x58, 0x13, 0xd7, 0x2c, 0x39, 0xae, 0x18, 0x2f, 0x90, 0x63, 0x8e, 0xa5, 0xd2, 0x0d, 0x83, 0x66, 0x3c, 0x0b, 0x27, 0xae, 0x71, 0x0a, 0xfa, 0x32, 0xfe, 0x8f, 0x71, 0xe6, 0x5a, 0xb1, 0x3d, 0x36, 0xd2, 0xb1, 0x6b, 0x5c, 0xb9, 0x43, 0x03, 0x63, 0xca, 0xcf, 0xb2, 0xe8, 0x3b, 0x24, 0x1d, 0x79, 0xb1, 0x6b, 0xa7, 0x61, 0x3c, 0xaf, 0x18, 0x89, 0x77, 0x11, 0x18, 0xd3, 0x88, 0xd1, 0x64, 0x19, 0xa3, 0xd8, 0x75, 0x0d, 0x99, 0xd1, 0x9d, 0x58, 0x9e, 0x6f, 0x58, 0xb6, 0x1d, 0x4e, 0x83, 0x94, 0x6b, 0x19, 0x79, 0xb2, 0x2a, 0x1f, 0xb4, 0x9a, 0xa4, 0xc8, 0x1d, 0x4e, 0x54, 0xee, 0x13, 0x2f, 0xb0, 0x02, 0xdb, 0xad, 0x18, 0x67}; io::filtering_istream decompressFilter; decompressFilter.push(io::gzip_decompressor()); std::strstream streamOfCompressedData; streamOfCompressedData.write((char*)compressedHTML, 586); decompressFilter.push(streamOfCompressedData); std::stringstream output; try { output << decompressFilter.rdbuf(); } catch(std::exception& exc) { exc; // dummy code to allow me to inspect exc: int i = 0; i; } }

2 1

Serialization Build Issues
by Arpan Sen 15 Feb '06

15 Feb '06

Hello everyone, I am attempting to build a single threaded static debug library of the boost serialization project, using the vc_7-1-stlport toolset. The only consideration being that the iostream library should be the native one. This has turned out to be quite a pain owing to the following reasons: 1. I could not figure out any know cmdline options to get this done. So, I hacked the stl_user_config.h and added the _STLP_NO_OWN_IOSTREAMS macro after which I start getting the compiler error "../include/iostream.h" --> No such file or directory. I was thinking that this is an issue with paths, but i do have an iostream.h inside Vc7/include. 2. The cmdline that I was using had the <threading>single option but that somehow did not work. I had to hack jam scripts to get things working but not sure if that was the only available option or am i missing something. I am using bjam 3.1.0. Any help appreciated. -- Regards, Arpan

1 0

Re: [Boost-users] [serialization] linking issues with 1.33
by rwm33＠drexel.edu 15 Feb '06

15 Feb '06

"The message suggests that the serialization libraries are not linked in.This would likely be an issue with link command line." The command i used to compile the demo is g++ demo.cpp -L/home/newton6/rwm33/usr/lib -lboost_serialization-gcc-mt-d -o demo I tried other variations of: g++ demo.cpp -L/home/newton6/rwm33/usr/lib -lboost_serialization-gcc-mt -o demo g++ demo.cpp -L/home/newton6/rwm33/usr/lib -lboost_serialization-gcc -o demo Should i be linking with something else? Thanks, Ryan McKeown Drexel University Physics Dept.

2 1

Re: [Boost-users] AIX/g++
by Dieter Rosch 15 Feb '06

15 Feb '06

Dunno about G++. We're forced to use xlC at work. All I can say is some of the libraries work, some of them don't. At least with our version. On 2/15/06, Jeff Garland <jeff(a)crystalclearsoftware.com> wrote: > > On Tue, 14 Feb 2006 14:24:30 -0800, Sohail Somani wrote > > Hi, > > > > I don't see any AIX regressions so I'm assuming no one officially tests > > this. > > Yep. > > > Does anyone have any notes about this platform/compiler > > combination? > > Not I. > > >Does it work? :) > > Seems likely if the g++ port is 3.x or above. > > Jeff > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

1 0

[program_options] Notifiers
by David Greene 15 Feb '06

15 Feb '06

How does one install a notifier for an option that does not have a value? For example, if I have an option --foo and I want to call foo_handler() when it is parsed, how do I do that? As far as I can tell from the documentation the only way to install a notifier is through a value_semantic, which doesn't apply here. -Dave

1 0

Newbie question : enable_if equivalent ?
by khasimo 15 Feb '06

15 Feb '06

Hi there, I'm trying to port the xmlbeansxx library (sourceforge.net/projects/xmlbeansxx) under windows using "Borland C++ 5.6.4". The thing is I am having trouble with the "enable_if" construction. From the "config\compiler\borland.hpp", I know that the bcc compiler do not support SFINAE trick and so the "enable_if" and like constructions. In order to continue the port I have to modify the "enable_if" implementation with something equivalent. Here is the code : template<typename TO, typename FROM, typename Enable = void> class cast_traits { public: TO operator ()(const FROM &from) const { return (TO)(from); } }; class Ptr { public: template <typename TYPE, typename TYPE_I> static inline TYPE ptrFromThis(const boost::shared_ptr<TYPE_I> &from) { TYPE n; n.ptr = from; return n; } }; /* (2) begin */ template<typename TO, typename FROM> class cast_traits<TO, FROM, typename boost::enable_if< boost::mpl::and_< boost::is_base_and_derived<Ptr, FROM>, boost::is_base_and_derived<Ptr, TO> > >::type > { public: TO operator ()(const FROM &from) const { TO r; r.ptr = ptr_cast<typename TO::value_type>(from.ptr); return r; } }; /* (2) end */ template<typename TO, typename FROM> inline TO cast(const FROM &from) { return cast_traits<TO, FROM>()(from); } My problem is with the "/*(2)*/" part of the code. In the library code there is other constructions based on "enable_if" but they are the same as the "/*(2)*/" example. Thanks folks in advance. I'am really a newbie to boost (and templates) and have no idea about a workaround. PS: It is obvious that I will contribute the port to the xmlbeansxx project.

1 0

Building Boost 1.31.1 on OpenBSD
by Quantum Skyline 15 Feb '06

15 Feb '06

Hi, I've been trying to compile Boost on OpenBSD 3.8 with no success, but I would like to have the threading library available. I've gone through the list a few times, and the only thing related to OpenBSD was posted back in '02 or '03. I compiled GCC 3.4.4 with threads because the default compiler is not threaded and run ./configure as the docs say, but I still can't get it to work. Is there anything else I need to know to get Boost::Threads to compile properly? Thanks

4 20

Re: [Boost-users] [program_options] multitoken
by Sohail Somani 15 Feb '06

15 Feb '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Alexander Kondratyuk > Sent: Tuesday, February 14, 2006 2:57 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] [program_options] multitoken > > Thanks to all for the comments. > I want to allow "--first=11,12" and ""--first=11 --first=12" > both, so its seems I need to do it manually. This should be simple enough using push() and a tokenizer so that the rest of your program doesn't have to care.

2 2

[serialization] linking issues with 1.33
by rwm33＠drexel.edu 15 Feb '06

15 Feb '06

Hello When updating libraries from boost 1.32 to 1.33 our previous code that had no previous linking problems developed linking errors. I then attempted to compile the demo.cpp serialization code included in the boost documentation tutorial and received the same errors. I attach below the code and the error message I got. I am working on a Linux Gentoo machine with Boost installed by e-portage. I believe boost is properly installed as it works with other libraries. Any suggestion? Thanks Ryan McKeown Drexel University Physics Dept. ========================================== CODE #include <fstream> // include headers that implement a archive in simple text format #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> ///////////////////////////////////////////////////////////// // gps coordinate // // illustrates serialization for a simple type // class gps_position { private: friend class boost::serialization::access; // When the class Archive corresponds to an output archive, the // & operator is defined similar to <<. Likewise, when the class Archive // is a type of input archive the & operator is defined similar to >>. template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } int degrees; int minutes; float seconds; public: gps_position(){}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; int main() { // create and open a character archive for output std::ofstream ofs("filename"); // create class instance const gps_position g(35, 59, 24.567f); // save data to archive { boost::archive::text_oarchive oa(ofs); // write class instance to archive oa << g; // archive and stream closed when destructors are called } // ... some time later restore the class instance to its orginal state gps_position newg; { // create and open an archive for input std::ifstream ifs("filename", std::ios::binary); boost::archive::text_iarchive ia(ifs); // read class state from archive ia >> newg; // archive and stream closed when destructors are called } return 0; } ====================================== ERROR /tmp/cchtRupV.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEE4initEv+0x1a): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()': : undefined reference to `boost::archive::ARCHIVE_SIGNATURE' /tmp/cchtRupV.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEE4initEv+0x84): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()': : undefined reference to `boost::archive::ARCHIVE_VERSION' /tmp/cchtRupV.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_iarchiveINS0_13text_iarchiveEE4initEv+0x2f): In function `boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::init()': : undefined reference to `boost::archive::ARCHIVE_SIGNATURE' /tmp/cchtRupV.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_iarchiveINS0_13text_iarchiveEE4initEv+0xd0): In function `boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::init()': : undefined reference to `boost::archive::ARCHIVE_VERSION' /tmp/cchtRupV.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEEC2Ev+0xe): In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::common_oarchive()': : undefined reference to `boost::archive::detail::basic_oarchive::basic_oarchive()' /tmp/cchtRupV.o(.gnu.linkonce.t._ZN5boost7archive6detail15common_iarchiveINS0_13text_iarchiveEEC2Ev+0xe): In function `boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::common_iarchive()': : undefined reference to `boost::archive::detail::basic_iarchive::basic_iarchive()' /tmp/cchtRupV.o(.gnu.linkonce.t._ZN5boost13serialization6detail27extended_type_info_typeid_0C2Ev+0x7): In function `boost::serialization::detail::extended_type_info_typeid_0::extended_type_info_typeid_0()': : undefined reference to `boost::serialization::detail::extended_type_info_typeid_0::type_info_key' collect2: ld returned 1 exit status

2 1