- Boost-users - lists.boost.org

Iterator Range, sub range of a desired size
by David Kimmel 02 Nov '12

02 Nov '12

Is there a function in BOOST, given a starting point and a desired size, that returns iterators for a (sub) range? For example, given: a boost::circular_buffer which contains: 1 2 3 4 5 6 7 8 9 10 a starting point which is an iterator pointing to 5 and finally a desired size which is an int s = 4 The result of which would be iterators producing: 5 6 7 8 A possible implementation might be this (but I was hoping there was a BOOST version since I can't find an STD algorithm) template <typename Itr> std::pair<Itr, Itr> getWindowDown(Itr begin, Itr end, Itr start, const int windowSize) { // Down first, then up if need be const Itr bottom = (end - start > windowSize) ? (start + windowSize) : (end); const Itr top = (bottom - begin > windowSize) ? (bottom - windowSize) : (begin); return make_pair(top, bottom); } Thanks, -- View this message in context: http://boost.2283326.n4.nabble.com/Iterator-Range-sub-range-of-a-desired-si… Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] [Thread] Win32 TLS problem with dynamic libraries
by Sarah Tappon 02 Nov '12

02 Nov '12

On Mon, Oct 29, 2012 at 12:31 AM, Сергей Захарченко wrote: > * Rename the Boost.Thread library into 'original_boost_thread'. > > * Add a custom target named 'patched_boost_thread' which uses dumpbin > and lib utilities to delete just the tss_pe.obj object from Boost.Thread. > > * Add a library called boost_thread which links to 'patched_boost_thread' and > contains a file named tss_pe.cpp which contains the aforementioned code > (essentially it's the 'null tss cleanup implementation'). I've been researching a similar issue and it's useful to hear from someone who has successfully implemented a workaround. A couple of follow-up questions, if you don't mind: Once the solution is in place, what (if anything) do you have to do to ensure that resources are cleaned up appropriately? Is it sufficient to call on_thread_exit() whenever a thread exits? > Assuming that I can guarantee that no Boost.Thread functions > are called from non-Boost.Thread threads, it shouldn't be > needed. Could you give me a concrete example of a call that would violate this guarantee? What happens if you violate it? Thanks, Sarah

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[boost::python] exposing an abstract base class through boost::ptr_vector and the vector indexing suite
by Andy Falanga (afalanga) 01 Nov '12

01 Nov '12

Hi everyone, I have need to expose a couple of different classes which inherit from a single, abstract, C++ class. This abstract class is what I need to expose to python. Using the python wiki, I've figure out the correct way to expose these classes. However, the next dimension to this problem is that my users aren't supposed to be able to instantiate any of the derived classes directly. Instead, they are to use a function which will return a list of these objects. I've been working on the correct implementation for use with boost::ptr_vector. Now, I want to use the vector indexing suite in boost::python to expose these things. I've worked through properly making an assignment overload operator appropriate to this for use with the vector indexing suite. However, I'm stumped at this error: Error 2 error C2440: 'return' : cannot convert from 'Base' to 'Base *' c:\program files\boost\boost_1_47\boost\python\suite\indexing\vector_indexing_suite.hpp 77 Because of this error, I'm wondering if it's not possible, or at least not recommended, to use the vector indexing suite to expose boost::ptr_vectors. Is this true? I'm using Visual Studio 2010 and Boost 1.47. Thanks, Andy

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[serialization] support for C++-11 types
by Marco Craveiro 01 Nov '12

01 Nov '12

Hi boost-users, Apologies if this question has been asked before - I'm sure it has, but my googling-fu is not finding decent matches. Anyways, the question is: with C++11 we have a number of new container types such as std::array, std::underdered_map/set, std::forward_list, etc. Are those supported by the latest release of the serialization library? If not, is there a trac ticket for this work? Many thanks for your time, Marco -- So young, and already so unknown -- Pauli blog: http://mcraveiro.blogspot.com

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bug of boost algorithm library or boost asio?
by kpzhang 01 Nov '12

01 Nov '12

Hi, Apologize if this is not the right place for this mail. This program (it has been narrowed down from a larger program) always crashes after compiled in vs2008 Release(Win32) mode under windows 7. I am not familiar with assembly code and don't know it's a bug of compiler or boost::ends_with or boost::asio::buffers_iterator. It can be compiled and executed with g++ in Ubuntu without any problem. People said it's very unlikely to be compiler's bug, but when compiled in debug moded(or disable optimization), the problem does disappear. I have been stuck with this problem for quite a few hours. Any help is appreciated. Thanks in advance. #include <iostream>#include <string>#include <boost/asio.hpp>#include <boost/algorithm/string.hpp> typedef boost::asio::buffers_iterator<boost::asio::const_buffers_1> iterator_t;typedef boost::iterator_range<iterator_t> range_t;static const std::string LINE_END_MARK = "\r\n"; int main(int argc, char* argv[]){ boost::asio::streambuf _buf; std::ostream os(&_buf); os<<"END\r\n"; iterator_t cursor = boost::asio::buffers_begin(_buf.data()); iterator_t end = boost::asio::buffers_end(_buf.data()); std::ostream_iterator<char> it(std::cout," "); std::copy(LINE_END_MARK.begin(), LINE_END_MARK.end(), it); range_t r(cursor, end); if(!boost::ends_with(r, LINE_END_MARK)) return 0; return 1;}

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__MINGW32_MAJOR_VERSION confusing, and causing problems with boost thread
by Florian Burkart 01 Nov '12

01 Nov '12

Hi, __MINGW32_MAJOR_VERSION is confusing me at the moment. Where is it coming from? What does it stand for? Even though my compiler at the moment informs me of PS C:\Sys\boost\boost_1_50_0> g++ --version g++.exe (GCC) 4.6.3 20111208 (prerelease) is is defined as 3 when boost compiles. __MINGW32_MINOR_VERSION is defined as 11. I had to hard check that, no idea where those numbers are coming from. This leads to this statement from boost_1_50_0\libs\thread\src\win32\tss_pe.cpp #if defined(__MINGW64__) || (__MINGW32_MAJOR_VERSION >3) || \ ((__MINGW32_MAJOR_VERSION==3) && (__MINGW32_MINOR_VERSION>=18)) evaluating to false and this extern "C" const IMAGE_TLS_DIRECTORY32 _tls_used __attribute__ ((section(".rdata$T"))) = to compile in, which in turn produces c:/mingw-4.6.1/bin/../lib/gcc/mingw32/4.6.1/../../../libmingw32.a(tlssup.o):tlssup.c:(.tls+0x0): multiple definition of `_tls_used' /Sys/boost/MinGW32/boost_1_50_0/lib/libboost_thread-mgw46-mt-d-1_50.a(tss_pe.o):tss_pe.cpp:(.rdata$T+0x0): first defined here when trying to link to the static library. I fixed that by hacking the 18 in the source down to a 11 and recompiling boost with PS C:\Sys\boost\boost_1_50_0> .\b2.exe --prefix=c:\Sys\boost\MinGW32\boost_1_50_0 toolset=gcc address-model=32 link=static -s BZIP2_SOURCE=C:\Sys\bzip2-1.0.6 -s ZLIB_SOURCE=C:\Sys\zlib-1.2.7 install That seems to have solved my issue for now, but I don't know if my major or minor versions are set incorrectly or whether this might a bug in the code base? Thoughts? Florian

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Re: [Boost-users] FW: bug of boost algorithm library or boost asio?
by kpzhang 01 Nov '12

01 Nov '12

Hi Alex, Thanks for your reply. To Igor: The exception type is 'Access Violation' raised in boost::ends_with function. Regards, Ivan 2012/10/31 Alex Perry <Alex.Perry(a)smartlogic.com> > Sorry forgot to add you to cc - it speeds up conversation if you are in > digest mode for boost list! > > -----Original Message----- > From: Alex Perry > Sent: 31 October 2012 15:04 > To: 'boost-users(a)lists.boost.org' > Subject: RE: [Boost-users] bug of boost algorithm library or boost asio? > > On 31 October 2012 09:05 kpzhang [mailto:sail4dream@gmail.com] wrote :- > > ...snip... > >People said it's very unlikely to be compiler's bug, but when compiled in > debug moded(or disable optimization), the problem does disappear. > >I have been stuck with this problem for quite a few hours. Any help is > appreciated. Thanks in advance. > ...snip... > > Not sure if its any help but just tried compiling this with VS2010 and > VS2012 > > From VS command prompt (with boost version 1.51 pathed into include and > lib) > > cl test.cpp /EHsc /O2 > > and resulting test.exe is fine (with or without /O2) > > So does look like a problem with vs2008 specifically (sorry don't have one > available to try any longer) > > Alex > >

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C++ Developers - ADVANCED AI PLATFORM (Artificial General Intelligence)
by B Hart 01 Nov '12

01 Nov '12

I am putting together a Google Plus Group for C++ developers who are (or would be) passionately interested in building a platform for strong AI (and eventual commercialization). If you want to be in this Google Plus Group please e-mail me at bhartsb at gmail dot com. Subject line "AI NOW" Please state a few details about yourself. Below is a link to a very abbreviated presentation. More details will be forthcoming if you join. Regards, Brian Hart Presentation: Building A Platform For Strong AI<https://docs.google.com/presentation/d/1OhPurShl7CP4qHDBRyW1cn2Aj2rYGKX3-eR…>

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C++ Now 2013 Call for Submissions
by Hartmut Kaiser 31 Oct '12

31 Oct '12

---------------------------------------------------------------------------- C++ NOW CONFERENCE 2013 - Aspen CO, USA, May 13-17, 2013, www.cppnow.org ---------------------------------------------------------------------------- CALL FOR SUBMISSIONS -------------------- We invite you to submit session proposals to the 2nd annual C++ Now Conference (Aspen CO, USA, May 13-17, 2013). Building upon the resounding success of C++ Now 2012 and five years of BoostCon, C++ Now 2013 will present leading speakers from the whole C++ community. The C++ Now Conference is dedicated to discussion and education about C++, an open and free language and standard. Our Conference will focus on discussion and education about open source software usage and developments in the C++ developer and user community. To reflect the breadth of the C++ and Boost communities, the conference includes sessions aimed at three constituencies: C++ and Boost end-users, hard-core Boost library and tool developers, and researchers pushing the boundaries of computation. The program fosters interaction and engagement within and across those groups, with an emphasis on hands-on, participatory sessions. As a multi-paradigm language, C++ is a melting pot where the most compelling ideas from other programming communities are blended in powerful ways. Historically, some of the most popular sessions at C++ Now have highlighted these concepts, from DSLs to functional programming to transactional memory and more. Bring your C#, Python, Ruby or Haskell influences to bear in an environment that will broaden their exposure. At C++ Now 2013 we would like to focus on parallel and distributed computing with C++. However, by no means this is intended to restrict the topics of proposals we hope to see. Any other topic related to C++ as outlined below is perfectly fine for submission. IMPORTANT DATES --------------- New proposal submissions due: December 15th, 2013. Proposals decisions sent (tentative program available): January 30th, 2013. Fully scheduled program available: February 24th, 2013. BEST PRESENTATION AWARDS ------------------------ We know how much effort it takes to prepare talks for our conference. For this reason we will award the best presentations in the following categories: Best Presentation, Best Short Presentation, Best Tutorial, and Best Workshop. The awards will be given based on the audience's voting. Each award will include the author's name listed on the cover of the C++ Now website for that year and a plaque containing all the C++ Now conference information. SESSION TOPICS -------------- Topics of interest include, but are not restricted to, the following: * Parallelism in the new C++11 standard * Parallel, distributed and GPGPU topics relating to C++ * C++11 and how it changes life for users and library writers * General tutorial sessions on C++11, the C++11 Standards library, and one or more Boost libraries * In-depth sessions on using specific Boost libraries * Case studies on using Boost * Experts panels * Advanced sessions on implementation techniques used within Boost libraries * Development workshops to extend or enhance existing Boost libraries * Workshops on design process * Infrastructure workshops such as Build tools, Website, Testing * Concepts and Generic Programming * Hardware and infrastructure presentations focused on how libraries can make better use of the technology * Software development tools and their application to C++ and or Boost * Other topics likely to be of great interest to C++ users and developers Interactive and collaborative sessions are encouraged, as this is the style of learning and participation that has proven most successful at such events. Sessions can be tutorial based, with an emphasis on interaction and participant involvement, or workshop based, whether hands-on programming or paper-based, discussion-driven collaborative work. SESSION FORMATS --------------- Presentations Presentations focus on a practitioner's ideas and experience with anything relevant to C++11, Boost and users. Panels Panels feature three or four people presenting their ideas and experiences relating to C++11 and Boost's relevant, controversial, emerging, or unresolved issues. Panels may be conducted in several ways, such as comparative, analytic, or historic. Tutorials Tutorials are sessions at which instructors teach conference participants specific skills relevant to C++11 and Boost. Workshops Workshops provide an active arena for advancements in Boost-relevant topics. Workshops provide the opportunity for experienced practitioners to develop new ideas about a topic of common interest and experience. Author's Corner Presentations These were introduced at BoostCon 2008, and were a great success. They are short (30 minute) sessions, focusing on tips on usage and design. In addition, we're looking to uncover the hidden design gems in Boost libraries. Tool Vendors Presentations We actively encourage tool vendors and ISP's to submit proposals for a special Tool Vendors Session Track aimed at products related to Boost and C++ (compilers, libraries, tools, etc.). Other formats may also be of interest. Don't hold back a proposal just because it doesn't fit into a pigeonhole. SUBMITTING A PROPOSAL --------------------- Standard Sessions are 90 minutes. You may submit a proposal for fractions Or multiples of 90-minutes. Fractional proposals will be grouped into 90 Minute sessions covering related topics. Longer sessions, such as tutorials and classes, will be assigned three hour (i.e. half day), or six hour (i.e. full day) time slots. Please include: * The working title. * Type of session: presentation, panel, tutorial, workshop, authors corner, vendor track, other. * A paragraph or two describing the topic covered, suitable for the conference web site. * Proposed length: 10-20 minute short talks, 45 minutes, 90 minutes, half day, full day. * Alternate lengths, if you are willing to make adjustments: 10-20 minute short-talks, 45 minutes, 90 minutes, half-day, full day. * Audience: users, developers, both. * Level: basic, intermediate, advanced. * A biography, suitable for the conference web site. * Your contact information (will not be made public). SUBMISSION DETAILS ------------------ All submissions should be made through the EasyChair conference management system: http://www.easychair.org/conferences/?conf=cppnow2013. If you have not already registered at EasyChair, you will need to do so in order to submit your proposal. All submissions will go through a peer review process. Authors are invited (but are not required) to submit PDF versions of full papers of up to 10 pages in ACM conference proceedings format (see http://www.acm.org/sigs/publications/proceedings-templates) The full papers are not required unless you want them published in the proceedings. All accepted proposals will be made available in the Association for Computing Machinery (ACM) Digital Library (approval pending). Best papers, after further reviews, will be considered to be book chapters or journal articles in a renowned journal. The session materials go on the C++ Now website and will be available to attendees. For general information on the C++ Now 2013 paper submission or the scope of technical papers solicited; please refer to the conference website at www.cppnow.org. For any other questions about the submission process or paper format, please contact the Program Committee at cppnow2013(a)easychair.com. If you have any technical problems with EasyChair, please contact EasyChair for help. Note: Presenters must agree to grant a non-exclusive perpetual license to publish submitted materials, either electronically or in print, in any media related to C++ Now. Hartmut Kaiser, email: hartmut.kaiser(a)gmail.com (Program Committee Chair) Dave Abrahams, email: dave(a)boostpro.com (Conference Chair) On behalf of the conference organizers

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lockfree is part of the boost-1.52?
by niXman 31 Oct '12

31 Oct '12

Hi, As I can see, lockfree is in trunk, but in the documentation for boost-1.52 is not said about that. Why? And one more question: How can I determine what lockfree is part of the boost? Is there a macro for this? -- Regards, niXman ___________________________________________________ Dual-target(32 & 64-bit) MinGW compilers for 32 and 64-bit Windows: http://sourceforge.net/projects/mingwbuilds/

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