July 2011 - Boost-users - lists.boost.org

[regex] Is it possible to feed boost regex with NFA/DFA
by Chandan Nilange 13 Jul '11

13 Jul '11

We are developing DFA/NFA based hardware regex engine. I intend to use regex boost as goldenized model. Can we feed the regex boost with NFA/DFA states instead of regular expressions syntax Regards, Chandan Nilange

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Serialization writing an old version of a class
by Don 13 Jul '11

13 Jul '11

Using boost serialization, I would like to be able to write an old version of a class, so that I can save data in an "old" format to allow other users with old versions of my program to read the file. I see from the archives that this has come up before, and Robert Ramey indicated it was doable and on the todo list, but I don't see it in the release notes or documentation. Did anything every come of this? Or, has anyone else done this? Thanks, Don.

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Segmentation fault of boost::format with Intel compiler on OS X
by Daniel Langr 13 Jul '11

13 Jul '11

Hi, compiling the following code with Intel's icpc on OS X: int i = 10; std::string s = boost::str(boost::format("%d") % i); we got segmentation fault when running the executable. With g++ everything works fine. Versions: Boost 1.46.1, Intel icpc 11.1/0.67, OS X 10.8.0 Please help, thanks in advance, Daniel

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[Range] sub_range and list not working together
by Brian Wood 13 Jul '11

13 Jul '11

B"H I've been testing my marshalling support for sub_range and have a question. In reviewing some old posts and notes, it looks like the following used to compile: boost::sub_range<std::list<int32_t> > rng; Today though I get the following error message: g++ -Os -s -W -Wall -I. -I ./loki-0.1.7/include/loki/flex -I /home/brian/boost_1_47_0_beta1 -c -o local_messages_d.cg.o local_messages_d.cg.cc In file included from /home/brian/boost_1_47_0_beta1/boost/range/iterator_range.hpp:13:0, from /home/brian/boost_1_47_0_beta1/boost/range/sub_range.hpp:23, from ./local_messages_d.cg.hh:5, from local_messages_d.cg.cc:1: /home/brian/boost_1_47_0_beta1/boost/range/iterator_range_core.hpp: In member function ‘boost::iterator_range<IteratorT>::difference_type boost::iterator_range<IteratorT>::size() const [with IteratorT = std::_List_iterator<int>, boost::iterator_range<IteratorT>::difference_type = int]’: /home/brian/boost_1_47_0_beta1/boost/range/sub_range.hpp:117:58: instantiated from ‘boost::sub_range<ForwardRange>::difference_type boost::sub_range<ForwardRange>::size() const [with ForwardRange = std::list<int>, boost::sub_range<ForwardRange>::difference_type = int]’ local_messages_d.cg.cc:22:33: instantiated from here /home/brian/boost_1_47_0_beta1/boost/range/iterator_range_core.hpp:252:32: error: no match for ‘operator-’ in ‘((const boost::iterator_range<std::_List_iterator<int> >*)this)->boost::iterator_range<std::_List_iterator<int> >::m_End - ((const boost::iterator_range<std::_List_iterator<int> >*)this)->boost::iterator_range<std::_List_iterator<int> >::m_Begin’ /usr/lib/gcc/i686-redhat-linux/4.5.1/../../../../include/c++/4.5.1/bits/stl_bvector.h:179:3: note: candidate is: ptrdiff_t std::operator-(const std::_Bit_iterator_base&, const std::_Bit_iterator_base&) /home/brian/boost_1_47_0_beta1/boost/range/iterator_range_core.hpp:253:13: warning: control reaches end of non-void function Is this to be expected? I don't know if a specialization for std::list in this regard would be useful, but seems possible. If I change the list to a vector, everything compiles fine. boost::sub_range<std::vector<int32_t> > rng; The following sentence from the docs doesn't make sense to me. "counting_range is a function to generator that generates an iterator_rangewrapping a counting_iterator (from Boost.Iterator). " Regards, Brian Wood Ebenezer Enterprises http://webEbenezer.net

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boost regex 64 bit build
by Lloyd 13 Jul '11

13 Jul '11

Hi, I want to build boost regex 64 bit for a program on a Windows 7 64bit machine. I have downloaded boost 1.45 and built "bjam" by running "bootstarp.bat". >From "bjam" I built the regex library using the following command bjam --build-type=minimal --with-regex using=msvc --address-model=64 I am compiling using visual studio 2010. When I try to link my program with boost::regex, i get the error unresoleved external symbol " private: class boost::basic_regex<char, ...... What could be the problem? Thanks a lot, Lloyd

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[iostreams] Issue when compiling with zlib, and suggestion
by Sean Farrow 13 Jul '11

13 Jul '11

Hi all: I'm currently trying to compile boost 1.47. I need to use the zlib features in the ioStreams library hence am using the following command line: bjam toolset=msvc --stagedir=stage/vc/v10/32-bit -sZLIB_SOURCE="c:\progra~1\zlib" -sZLIB_LIBPATH="c:\progra~1\zlib\boost_zlib.lib" -sBZIP2_SOURCE="c:\progra~1\bzip2" --build-type=complete >boostv10.txt this fails telling me it carn't open boost_zlib.lib. it appears from the docs that this command line is correct. I'm compiling on windows xp, vc 2010. Also, whilst I think about it, without modifying the default jam file the boost.iostreams library fails to compile, the file gzio.c is no longer in the zlib distribution as of version 1.2.3.9-could this be rectified for future boost releases? Regards Sean.

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Some quesions about boost::flyweight
by 邹磊 12 Jul '11

12 Jul '11

Hi, all. Does boost::flyweight support serialization ? If it does, could you give me a example ? I cannot find document about serialization for this library. Thanks. Regards. zou

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[1.47] PDF build of documentation available.
by John Maddock 12 Jul '11

12 Jul '11

The PDF builds of the Boost documentation are now available from: https://sourceforge.net/projects/boost/files/boost-docs/1.47.0/ Note that as ever, only the subset of libraries which use quickbook/boostbook/docbook as their documentation format are included in the build. Regards, John.

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boost::mpl and VS 2005
by narinder.claire＠uk.bnpparibas.com 12 Jul '11

12 Jul '11

Hi, The following piece of code compile successfully on VS2008,VS2010 & GCC 4.5.2 but fails to compile on VS2005. Is the likely to be because of a bug in VS2005 ? (boost v 1.46.1) ------------------------------------------------------------ #include<iostream> #include<string> #include<boost/tr1/type_traits.hpp> #include<boost/mpl/empty.hpp> #include<boost/mpl/vector.hpp> #include<boost/mpl/filter_view.hpp> #include<boost/utility.hpp> template<class T> struct is_recognised_type { static const bool value =false; }; typedef boost::mpl::vector<std::string> naked_variant_type_list; struct myclass { myclass(){} template<class T> myclass(const T&t, const typename boost::disable_if_c<is_recognised_type<T>::value,T >::type * ptr =0, const typename boost::disable_if_c< boost::mpl::empty< typename boost::mpl::filter_view< naked_variant_type_list,boost::is_convertible<T,boost::mpl::_> >::type>::value>::type * pt =0, const typename boost::enable_if_c< boost::mpl::empty< typename boost::mpl::filter_view< naked_variant_type_list,std::tr1::is_base_of<boost::mpl::_,T> >::type>::value>::type * pt2 =0) { } }; int main() { myclass m; m = "hello"; } ------------------------------------------------------------ My workaround is to collapse is_convertible and is_base_of into a single type_trait is_convertible_but_not_derived_from. and then it works. The problems seems to be that there are two trait checks, using either one individualy seems to work. Rgds Narinder ___________________________________________________________ This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited. Please refer to http://www.bnpparibas.co.uk/en/information/legal_information.asp?Code=ECAS-… for additional disclosures.

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Lean and mean boost
by Robert Bielik 12 Jul '11

12 Jul '11

Hi all, I'm sitting here developing a build script to automate my build which first of all involves checking out sources, one of which is boost. However, 99.9% of the checkout time is boost tests/documentation/examples and what have you. It would be such a good feature to split out these stuffs so that there is a way to get to the nitty gritty jucy stuff without having to wait half a day... ;) Sorry for kicking in open doors, if that's what I'm doing ? :) Regards /Rob

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