March 2014 - Boost - lists.preview.boost.org

[ANN] Registration for CppCon 2014 is Open
by Boris Kolpackov 18 Mar '14

18 Mar '14

CppCon, The C++ Conference Opening Keynote by Bjarne Stroustrup September 7–12, 2014 Bellevue, Washington, USA Registration is now open for CppCon 2014 to be held September 7–12, 2014 at the Meydenbauer Center in Bellevue, Washington, USA. This year the conference starts with the keynote by Bjarne Stroustrup titled "Make Simple Tasks Simple!" CppCon is the annual, week-long face-to-face gathering for the entire C++ community. The conference is organized by the C++ community for the community. You will enjoy inspirational talks and a friendly atmosphere designed to help attendees learn from each other, meet interesting people, and generally have a stimulating experience. Taking place this year in the beautiful Seattle neighborhood and including multiple diverse tracks, the conference will appeal to anyone from C++ novices to experts. What you can expect at CppCon: * Invited talks and panels: CppCon keynote by Bjarne Stroustrup will start off a week full of insight from some of the world’s leading experts in C++. Still have questions? Ask them at one of CppCon's panels featuring those at the cutting edge of the language. * Presentations by the C++ community: What do embedded systems, game development, high frequency trading, and particle accelerators have in common? C++, of course! Expect talks from a broad range of domains focused on practical C++ techniques, libraries, and tools. * Lightning talks: Get informed at a fast pace during special sessions of short, informal talks. Never presented at a conference before? This is your chance to share your thoughts on a C++-related topic in an informal setting. * Evening events and "unconference" time: Relax, socialize, or start an impromptu coding session. CppCon’s goal is to encourage the best use of C++ while preserving the diversity of viewpoints and experiences, but other than that it is non-partisan and has no agenda. The conference is a project of the Standard C++ Foundation, a not-for-profit organization whose purpose is to support the C++ software developer community and promote the understanding and use of modern, standard C++ on all compilers and platforms. For more information about the conference and to register, visit: http://cppcon.org

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Boost.Compute v0.1 Released
by Kyle Lutz 18 Mar '14

18 Mar '14

I'm proud to announce the initial release (version 0.1) of Boost.Compute! It is available on GitHub [1] and instructions for using the library can be found in the documentation [2]. Boost.Compute is a GPGPU and parallel-programming library based on OpenCL. It provides an STL-like API and implements many common containers (e.g. vector<T>, array<T, N>) as well as many common algorithms (e.g. sort(), accumulate(), transform()). A full list can be found in the header reference [3]. I hope to propose Boost.Compute for review in the next few months but for I'm looking for more wide-spread testing and feedback from the Boost community (please note the FAQ [4] and design rationale [5] where I hope to have answered some common questions). Thanks, Kyle [1] https://github.com/kylelutz/compute [2] http://kylelutz.github.io/compute/ [3] http://kylelutz.github.io/compute/compute/reference.html [4] http://kylelutz.github.io/compute/boost_compute/faq.html [5] http://kylelutz.github.io/compute/boost_compute/design.html

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[math] Extensive warnings when compiling with clang
by Brian Ravnsgaard Riis 18 Mar '14

18 Mar '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I realise these are not that serious, just annoying. See example below. I'm building with clang++, modified to default in C++11 mode. /Brian Riis clang-linux.compile.c++.with-pch bin.v2/libs/math/build/clang-linux-3.4/release/link-static/threading-multi/fminf.o In file included from <built-in>:168: In file included from <command line>:4: In file included from /home/brian/programming/boost/libs/math/build/../src/tr1/pch.hpp:9: In file included from ./boost/math/special_functions.hpp:15: In file included from ./boost/math/special_functions/airy.hpp:10: In file included from ./boost/math/special_functions/bessel.hpp:18: In file included from ./boost/math/special_functions/detail/bessel_jy.hpp:14: In file included from ./boost/math/special_functions/gamma.hpp:28: In file included from ./boost/math/special_functions/lanczos.hpp:1288: ./boost/math/special_functions/detail/lanczos_sse2.hpp:54:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d vx = _mm_load1_pd(&x); ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:55:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d sum_even = _mm_load_pd(coeff); ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:56:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d sum_odd = _mm_load_pd(coeff+2); ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:57:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d nc_odd, nc_even; ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:57:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d nc_odd, nc_even; ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:58:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d vx2 = _mm_mul_pd(vx, vx); ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:139:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d vx = _mm_load1_pd(&x); ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:140:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d sum_even = _mm_load_pd(coeff); ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:141:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d sum_odd = _mm_load_pd(coeff+2); ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:142:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d nc_odd, nc_even; ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:142:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d nc_odd, nc_even; ^~~~~~~~~ ./boost/math/special_functions/detail/lanczos_sse2.hpp:143:4: warning: 'register' storage class specifier is deprecated [-Wdeprecated-register] register __m128d vx2 = _mm_mul_pd(vx, vx); ^~~~~~~~~ 12 warnings generated. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTKAqhAAoJEFES4N8QrEodTJ4H/1Hl2vyJ/Ki7JCK+YZsgwLvr MztU3H4IFfaUf4+EXPjnJbhu5f19Fhupn7RH6PLIJElUBYQGvKSEp2DRNddalrDK vKZVxGe25pDAD1HOsPRKH+74xXqSfeAAbYi/PvwusXLwhS2kYH+k6KzdXn6POsEe PrdweMusGLp9TH36DYNM59+SU16oGPdOj53acZSG06ftG8+1FcFXtb2jTMZY7fZX l/3gUBkQ7kl7ZkAoezNNlKcb/r+dIXNfb2oaV7TwSUGD+7ioQvvsSFjr2ytl3cb8 q01hLY4ih2mjMkrvCfflbAwGXH6noyEm/ySmjAxxekyCyP4na/W648+hAhnlimg= =vvz8 -----END PGP SIGNATURE-----

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GSoC '14 - Boost.Compute
by Roshan 18 Mar '14

18 Mar '14

Hey, I wish to propose a project regarding Boost.Compute. I would love to hear your views on it. Here is a link to my proposal: Dropbox Link <https://www.dropbox.com/s/tkpdomvoxpzisg7/GSoC.pdf> Thanks. -- Warm regards Roshan

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GSoC Boost/Monads
by Дмитрий Карпов 17 Mar '14

17 Mar '14

Hello! My name is Dmitry. I have submitted my prorposal in GSoC. But I'd like change it little bit. What is your expectation from this project? I'd like: - to implement common monad's interface: - functions for async and futures (then(), is_ready and I hope I will have enough time to implement some others) - make some experiment with Either and Maybe monads to implement fmap() for smart pointers and containers Should I keep in my mind some other tasks? Can you advise something about State monad? What should be it used for, input/output or, maybe, for secure operation with implicit type conversion or for something else? This is link to my proposal: http://www.google-melange.com/gsoc/proposal/review/student/google/gsoc2014/… -- Best regards, Dmitry Karpov Cell phone: +7 905 271 94 14

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[Boost.Functional][GSoC] Boost.Functional / Monad project proposal
by Benjamin, John C. (MU-Student) 17 Mar '14

17 Mar '14

Name: John Benjamin College/University?: University of Missouri - Columbia Course/Major?: Computer Science Degree Program (B.Sc., M, Sc., PhD, etc.) M.S. Email: jcb638(a)mail.missouri.edu Homepage: github.com/jchbenjamin Availability: How much time do you plan to spend on your GSoC? 30-40 hours per week What are your intended start and end dates? May 16 - August 19 What other factors affect your availability (exams, courses, moving, work, etc.)? I will be doing 3 credit hours of research Background Information I am a master's student in computer science. I've been hacking and programming computers since I was in Junior High. Please summarize your educational background (degrees earned, courses taken, etc.). I have a B.S. in economics from the University of Kansas. Between Spring 2012 and Spring 2013 I did post-baccalaureate study in Computer Science. I have the equivalent coursework for an undergraduate major in Computer Science. Please summarize your programming background (OSS projects, internships, jobs, etc.). I work for a lab associated with the government on campus where we perform remote sensing work across large sets of satellite data. The focus is on high-performance computing and database design. There is a large SVN repository of C++ code for which I am a regular contributor. Please tell us a little about your programming interests. Please tell us why you are interested in contributing to the Boost C++ Libraries. I am interested in Boost because I have been working with Boost for my work and for many classes. Boost has always been the most satisfying library. It is general purpose, always fast, and really attuned to the needs of the programmer. It is an amazing blend of practical use, solid theory, and good engineering. It would be a huge honor to be able to work with this project. What is your interest in the project you are proposing? I am interested in helping to implement a common monad framework for Boost. Have you done any previous work in this area before or on similar projects? I have worked with Haskell for a year with Prof. William Harrison at my school. Last summer I did research with Haskell and wrote a nifty little program that uses a state monad. What are your plans beyond this Summer of Code time frame for your proposed work?. I hope to continue contributing with this work and to help foster awareness and use of monads. I think that Haskell is on to something with some of its language features. Features like lambdas are already becoming part of the new way of structuring programs. I think monads are a powerful way to reason about and understand the properties of a program. But I don't think a full-blown functional language is practical or necessary for most problems. When typical programmers see that Monads can fit into a language used in industry and that builds on what they already know and expect of the behavior of a language they will be more open to thinking about higher level structural concepts from Category Theory. Please rate, from 0 to 5 (0 being no experience, 5 being expert), your knowledge of the following languages, technologies, or tools: C++ :: 4 C++ Standard Library :: 4 Boost C++ Libraries :: 3 Subversion :: 3 What software development environments are you most familiar with (Visual Studio, Eclipse, KDevelop, etc.)? Eclipse, gnu autotools What software documentation tool are you most familiar with (Doxygen, DocBook, Quickbook, etc.)? Doxygen Project Proposal The proposal is not too creative, just what is described in Boost.Functional / Monads Please provide a description of your proposed work. I will work to make sure the Monad implementation meets the actual description of a monad. One thing I think is important is to be able to have recursive monads that are efficient. The IO monad for example is particularly amenable to recursive structures that allow for easy sanitation of input and output. Proposed Milestones and Schedule Rough draft of milestones and schedules: May 19 - June 2 : review Monads and Category Theory. Understand the current state of Boost.Functional / Monad. Read through Pure and discuss how our implementation is different. June 2 - June 30 : Propose, discuss, and finalize working prototype which implements all the required existing instances of monads and meets syntactic conventions. Begin coding July 1 - July 21 : Implement finalized proposal and prepare for testing July 21- end of summer : test and document my work Please provide any feedback. If you need more information or a more specific proposal please let me know. John Benjamin?

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GSoC 2014 proposal for Boost.Chrono/Date
by Arun Sori 17 Mar '14

17 Mar '14

Hey all, I am interested in the Boost.Chrono/Date project for this year's GSoC. I've made a proposal here<https://docs.google.com/document/d/1jzqAuVh_GZL2TihIlMlG6qX6IfMfOrRw1hOfUre…>, with some good help from the project's mentor. It's open for reviews. Please have a look and point out any mistakes,typos or anything else I am missing. Any feedback is much appreciated. Thanks, Arun

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[GSoC 2014] Http Server Proposal
by Vinícius dos Santos Oliveira 17 Mar '14

17 Mar '14

Hi guys, I'm interested in develop an asynchronous HTTP server for Boost as part of GSoC. The design would be inspired from Node.js without the facilities or inspirations that were created to overcome JavaScript quirks and limitations. The library would be modular to the point where you can use only small parts of it and you could also replace components that you don't like. The library should have a small overhead to be used on embedded projects, but the modular design will allow you to use higher abstractions when such concerns don't exist. Of course it's difficult to find the "right" answer to the problem, then I'll limit the higher-abstractions to "proven" techniques and avoid controversial features. I hope to give more details in the middle of the next week. The library will not be about writing template-driven web pages, but it will be about HTTP and you will be able to do things like video live stream via HTTP (try to do that with Django or PHP). I also intend to allow a efficient use in multithreaded environment with high-load of data (although network applications are usually I/O bound and not CPU bound). Of course it'll be possible to use WebSocket with this library too. Another thing I want to allow is to mock HTTP requests and transparently replace parts of the stack without affecting already written code. The purpose of this feature is to allow other transport mechanism such as FastCGI and also provide a future-proof approach by better allowing HTTP/2.0 when released. I would implement such library on top of Boost ASIO and I'd include facilities that I'm sure would work on long-term. Because the success of such project is very sensible to the chosen design, I'd limit its scope to things that I know it will work long-term. If the implementation project end up being too small, I can also implement WebSocket support (I had implemented it before and it wouldn't be such challenge for me), where the implementation effort is higher than the interface effort. I'm not sure about the deliverables (yet!), but I hope to give more details soon, once I have written nice texts. I'm particularly interested in an elegant way to represent some data structures, but I'll detail the plans soon (lots of text to write, ideas to explain and references to convince, among other). The text was a bit long, but it's because I already have something in mind. I hope to deliver a proposal explaining all the design, why I think it would work and other matters in the middle of the next week. I'm also open to suggestions and modifications in the not-yet-presented-proposal. I can provide background about my experiences later, but for now I want to know what do you guys think about the idea. TL;DR: For now I want to know what do you guys think about having a core HTTP server library in Boost. -- Vinícius dos Santos Oliveira https://about.me/vinipsmaker

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Library metadata
by Daniel James 17 Mar '14

17 Mar '14

Hi, I'm starting to add metadata to modules for updating the website, and hopefully other uses in the future. I added the metadata to Boost.Unordered and Boost.Functional to give you an idea of what this will look like: https://github.com/boostorg/functional/tree/develop/meta https://github.com/boostorg/unordered/tree/develop/meta You can see several libraries listed in the Boost.Functional file. I'll write some documentation soon, but it should be fairly easy to understand. I basically took what was in the website library list and split it up into modules. Quick summary of the fields: key - Used to be the website to identify each library. Don't change it, or the website will think it's a new library. boost-version - The version in which the library was released. name - The name of the library. authors - The authors of the library - will probably add a 'maintainers' field later. description - Library description - this is used in the library list, so keep it short. std-proposal - Is the library proposed for the standard. std-tr1 - Is the library part of TR1. category - The categories the library belongs to. one element for each category. The documentation will include a list of available categories. documentation - Path to the documentation. The documentation field is optional. If it isn't included, it'll use the default path: /libs/module-name/. If it is included, relative paths are resolved relative to the module directory, absolute paths from boost root - although I'd suggest you always use a path within the module, and if there's only a single library in a module, use the default path. This isn't the final format - I think the standards status fields could do with an overhaul to support C++11 etc. You also don't need to write the initial files yourself, I'll generate them and create pull requests once this is settled. Let me know what you think. thanks, Daniel

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Submitting Proposal
by Pulkit Mendiratta 17 Mar '14

17 Mar '14

Hello! I am not able to find a link to submit my proposal. After logging in to google-melange, and requesting a role from boost community, i am not able to find a link to submit it. -- Cheers, Pulkit Mendiratta

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Possible problem in boost::enable_if_c or MSVC 11
by Emil Dotchevski 17 Mar '14

17 Mar '14

I've noticed that for some reason some of the tests of the QVM library (which is in the queue for Boost review) are failing on MSVC 11. The tests that fail use boost::enable_if_c. Before I investigate further, I'm wondering if anyone else has had problems with enable_if_c and MSVC 11 (this code works with earlier versions of MSVC and with GCC.) Thanks, Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode

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Boost.odeint Applicant Test
by Zeshawn Shaheen 16 Mar '14

16 Mar '14

Hi, I am Zeshawn Shaheen, a junior at the University of the Pacific in Stockton, CA, US. I am a double major in computer science and mathematics and was interested in partaking in developing implicit routines for Boost.odeint. I've read in the Boost Developers Archive that a small test is given regarding the applicant's coding skills and the odeint library. I would appreciate it if I could be given the test. Thank you. Sincerely, Zeshawn Shaheen

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[GSoC 2014] [Computation of generalized hypergeometric functions]
by Cosmin Boaca 16 Mar '14

16 Mar '14

Hello, I am Cosmin Boaca, and I want to contribute to boost during GSoC 2014. Here is my proposal [0] . Please give me some feedback about it. [0] https://www.google-melange.com/gsoc/proposal/review/student/google/gsoc2014… Thank you, Cosmin Boaca

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Re: [boost] [GSoC] Boost.Thread executors proposal
by Ian Forbes 15 Mar '14

15 Mar '14

>First provide in addition a static polymorphic interface. The template >functions submit_at and submit_after would accept any chrono >`time_point` and `duration`. Is this with respect to the granularity of the time point? e.g. nano/micro/mille etc? If it is I'm assuming this would take an executor and then convert the time point to the desired granularity (nanoseconds by default) then add it to the executor. >Second, provide an adaptor that wraps an scheduled executor and makes it >a polymorphic one. Polymorphic with respect to what? >Third, provide an adaptor that wraps an executor, manage the time based >operations using a specific thread and forward all the operations to the >wrapped executor. So this would take a reference to an executor or a shared_ptr then spawn a single thread that would loop and add the submitted closures at the desired time to the given executor? Ian, ________________________________________ From: Boost [boost-bounces(a)lists.boost.org] on behalf of Vicente J. Botet Escriba [vicente.botet(a)wanadoo.fr] Sent: Friday, March 14, 2014 3:34 AM To: boost(a)lists.boost.org Subject: Re: [boost] [Boost.Thread][GSoC] Boost.Thread executors proposal Le 13/03/14 04:59, Ian Forbes a écrit : > Hi, > > Here is my GSoC proposal for working on the scheduled executors classes. It can be found here: www.cs.mcgill.ca/~iforbe/ > > This proposal mainly deals with the implementation of classes extending the `scheduled_executor` interface. I have already written thread pool implementations with very similar functionality to the ones proposed. > > I feel that the current proposal could use a little bit of touching up so please feel free to leave comments/criticisms. > > I would also be willing to take on any other work related to executors such the the dynamic/work-stealing thread pool implementation or the parallel algorithms library and add it into my proposal. > > Hi, I like your proposal on scheduled_executor and possibly extend it to a priority thread pool. I would let the work-stealing outside the proposal. Just to note that the closure would not be a std::function<void()> as this class doesn't accept a movable only function. Boost.Thread would include (version 1.56) a boost::executors::work as a type-erased class for closures. I'm looking for a different approach respect to scheduled work of the N3785 proposal. First provide in addition a static polymorphic interface. The template functions submit_at and submit_after would accept any chrono `time_point` and `duration`. Second, provide an adaptor that wraps an scheduled executor and makes it a polymorphic one. Third, provide an adaptor that wraps an executor, manage the time based operations using a specific thread and forward all the operations to the wrapped executor. What do you think of this approach? Best, Vicente _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Re: [boost] [GSoC] pipelines questions
by Thaler Benedek 14 Mar '14

14 Mar '14

> I'm interested in the Boost.Pipelines proposal of GSoC 2014. [snip] Hi, I created a preview [0] with a working example. Please see the readme file and example/hello.cpp. This demo does not have parallel abilities and supports only 1-to-1 transformations in the pipeline. The purpose of this is to showcase my programming abilities and ask your opinions regarding the design and implementation. I intend to have this repository as a supplement of my proposal. Thanks, Benedek [0]: https://github.com/erenon/pipeline

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Permissions in boost::iostreams::mapped_file output
by Patrick Reynolds 14 Mar '14

14 Mar '14

Boost folks, Working with mapped_files in a project, I recently discovered that the files were being written to disk with unexpected permissions on the linux systems. I discussed this further in a pull request here: https://github.com/boostorg/iostreams/pull/2 Is this the proper avenue for making such a contribution? If not, where can I go to get started. Thanks, Patrick

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[modular-boost] Errors on submodule update
by Marcel Raad 14 Mar '14

14 Mar '14

Hi, I'm using TortoiseGit 1.8.7 with msysgit 1.8.5.2 on Windows and have checked out the develop branch of the boost repository. On every submodule update, I get the following errors. Is the submodule configuration corrupt? Git seems to believe that there are msm and polygon submodules which are not in the libs directory: ... git.exe submodule update -- "libs/msm" ... git.exe submodule update -- "libs/polygon" ... git.exe submodule update -- "msm" error: pathspec 'msm' did not match any file(s) known to git. Did you forget to 'git add'? git.exe submodule update -- "polygon" error: pathspec 'polygon' did not match any file(s) known to git. Did you forget to 'git add'? ...

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[Boost.Thread][GSoC] Boost.Thread executors proposal
by Ian Forbes 14 Mar '14

14 Mar '14

Hi, Here is my GSoC proposal for working on the scheduled executors classes. It can be found here: www.cs.mcgill.ca/~iforbe/ This proposal mainly deals with the implementation of classes extending the `scheduled_executor` interface. I have already written thread pool implementations with very similar functionality to the ones proposed. I feel that the current proposal could use a little bit of touching up so please feel free to leave comments/criticisms. I would also be willing to take on any other work related to executors such the the dynamic/work-stealing thread pool implementation or the parallel algorithms library and add it into my proposal. Thank, Ian

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[GSoC] [RFC] Proposal: A C++11 enabled TMP library
by Louis Dionne 14 Mar '14

14 Mar '14

Hi, As suggested earlier on this list, I am posting my GSoC proposal here in an attempt to gather comments and to improve the proposal. Basically, if you would not give the proposal 10/10, then I would like to know the reason so I can change it accordingly. I am strongly motivated with this project and I want to maximize my chances of getting in. The proposal is written in Markdown because that's easier to read than plain text; it is available here (secret gists are just hidden from search engines): http://gist.github.com/ldionne/d05528280db79105e30d Please post all constructive comments that come to your mind. Thank you, Louis Dionne

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GSoC Proposal for Boost.numeric.uBLAS (Review Request)
by Ganesh Prasad 13 Mar '14

13 Mar '14

Hi I have tried to write a feasible proposal for uBLAS, but I am not exactly sure about the time line I have proposed. I have considered my own efficiency and estimated the time considering the dependencies among the proposed algorithms. I will be glad to receive some advice regarding this project. Best Wishes Ganesh Prasad

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[atomic] gcc-atomic.hpp errors with Clang 3.4
by Richard Hadsell 12 Mar '14

12 Mar '14

I am trying to build Boost 1.55 libraries with Clang 3.4 using g++ 4.8.2 as the toolchain on CentOS 6.5. I think these errors arise from trying to initialize 128-bit integers with 0: clang-linux.compile.c++.without-pth bin.v2/libs/atomic/build/clang-linux-3.4/release/address-model-64/instruction-set-core2/link-static/threading-multi/lockpool.o In file included from libs/atomic/src/lockpool.cpp:3: In file included from ./boost/atomic.hpp:12: In file included from ./boost/atomic/atomic.hpp:17: In file included from ./boost/atomic/detail/platform.hpp:22: ./boost/atomic/detail/gcc-atomic.hpp:961:64: error: no matching constructor for initialization of 'storage_type' (aka 'boost::atomics::detail::storage128_type') explicit base_atomic(value_type const& v) BOOST_NOEXCEPT : v_(0) ^ ~ ./boost/atomic/detail/gcc-atomic.hpp:932:28: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const boost::atomics::detail::storage128_type' for 1st argument struct BOOST_ALIGNMENT(16) storage128_type ^ ./boost/atomic/detail/gcc-atomic.hpp:932:28: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided ./boost/atomic/detail/gcc-atomic.hpp:968:22: error: no viable conversion from 'int' to 'storage_type' (aka 'boost::atomics::detail::storage128_type') storage_type tmp = 0; ^ ~ ./boost/atomic/detail/gcc-atomic.hpp:932:28: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const boost::atomics::detail::storage128_type &' for 1st argument struct BOOST_ALIGNMENT(16) storage128_type ^ Similar errors follow these. I think the initializations to 0 are superfluous, because they are followed by memcpy calls that overwrite them. I will try that fix myself, but I am looking for an official fix that will get into the next release. -- Dick Hadsell 203-992-6320 Fax: 203-992-6001 Reply-to: hadsell(a)blueskystudios.com Blue Sky Studioshttp://www.blueskystudios.com 1 American Lane, Greenwich, CT 06831-2560 Follow Blue Sky Studios on Facebook <http://www.facebook.com/BlueSkyStudios> and Twitter <http://twitter.com/#%21/blueskystudios>

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[1.55.0] link.jam: No such file or directory
by Richard Hadsell 12 Mar '14

12 Mar '14

I am trying to build Boost 1.55 libraries with Clang 3.4 using g++ 4.8.2 as the toolchain on CentOS 6.5. When I run the command that I used for building 1.52.0, I get a message that seems to be harmless but indicates something has changed in the bjam options: bin/bjam --user-config=user-config.LINUX_C65 threading=multi instruction-set=core2 address-model=64 variant=release link=static,shared --stagedir=stageC65 stage link.jam: No such file or directory ... What's up with that? -- Dick Hadsell 203-992-6320 Fax: 203-992-6001 Reply-to: hadsell(a)blueskystudios.com Blue Sky Studioshttp://www.blueskystudios.com 1 American Lane, Greenwich, CT 06831-2560 Follow Blue Sky Studios on Facebook <http://www.facebook.com/BlueSkyStudios> and Twitter <http://twitter.com/#%21/blueskystudios>

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[function] Multi-signature function?
by TONGARI J 12 Mar '14

12 Mar '14

Hi folks, I know it'd be better to say "overload", but I choose the word carefully because I'm aware of Boost.OverloadedFunction, which is not what I'm talking here (it's complementary, though). What I want is to have std/boost::function support multi-signature itself, instead of relying on some external wrapper which is less efficient. For example: struct A { int operator()() const; int operator()(int val) const; }; function<int(), int(int)> f(A{...}); f can store one instance of A internally, compared to the external approach, in which case each overload holds a standalone instance, plus the control data. I know Boost.Function has its baggage from C++98/03, so changing the interface may not be appropriate, in that case a new library can be considered (Boost.Overload?). A sample C++11 implementation can be found here: https://gist.github.com/jamboree/9489193 What do you think?

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[type_erasure] any_cast to a base class?
by Phil Endecott 12 Mar '14

12 Mar '14

Dear Experts, Can boost::type_erasure::any_cast cast to a base class? For example: class Base {}; class Derived: public Base {}; Derived d; any< ??? > a (d); Base* b = any_cast<Base*>(&a); assert(b); I know that this isn't possible with Boost.Any, but was hoping that Boost.TypeErasure would include some "magic" to make it possible. Failing that, are there any other options? (What I'd really like to do is to store a weak_ptr<Derived> and retrieve a shared_ptr<Base>, and other similar combinations, but I get stuck before I get that far.) Thanks, Phil.

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[spirit] hold_any missing assignment operator?
by Robert Carlsen 12 Mar '14

12 Mar '14

I ran into trouble when trying to do assignments between hold_any objects. The problem seems to be fixed by adding a missing assignment operator to basic_hold_any: basic_hold_any& operator=(basic_hold_any const& x) { return assign(x); } Here is some code that demonstrates the problem: int main(int argc, char* argv[]) { boost::spirit::hold_any v1 = std::string("val1"); { boost::spirit::hold_any v2 = std::string("val2"); v1 = v2; } return 0; } When executing that function, I get: *** Error in `./foo': double free or corruption (fasttop): 0x0000000001a50040 *** ======= Backtrace: ========= /usr/lib/libc.so.6(+0x731ff)[0x7f4800a331ff] /usr/lib/libc.so.6(+0x789ae)[0x7f4800a389ae] /usr/lib/libc.so.6(+0x796b6)[0x7f4800a396b6] /usr/lib/libstdc++.so.6(_ZNSsD1Ev+0x1f)[0x7f480133956f] ./foo[0x400e74] ./foo[0x400e10] ./foo[0x400cb7] /usr/lib/libc.so.6(__libc_start_main+0xf5)[0x7f48009e1b05] ./foo[0x400b04] ======= Memory map: ======== 00400000-00402000 r-xp 00000000 08:01 16813021 /home/robert/foo 00402000-00403000 rw-p 00001000 08:01 16813021 /home/robert/foo 01a50000-01a71000 rw-p 00000000 00:00 0 [heap] 7f48009c0000-7f4800b5e000 r-xp 00000000 08:01 6163783 /usr/lib/libc-2.19.so 7f4800b5e000-7f4800d5e000 ---p 0019e000 08:01 6163783 /usr/lib/libc-2.19.so 7f4800d5e000-7f4800d62000 r--p 0019e000 08:01 6163783 /usr/lib/libc-2.19.so 7f4800d62000-7f4800d64000 rw-p 001a2000 08:01 6163783 /usr/lib/libc-2.19.so 7f4800d64000-7f4800d68000 rw-p 00000000 00:00 0 7f4800d68000-7f4800d7d000 r-xp 00000000 08:01 6191352 /usr/lib/libgcc_s.so.1 7f4800d7d000-7f4800f7d000 ---p 00015000 08:01 6191352 /usr/lib/libgcc_s.so.1 7f4800f7d000-7f4800f7e000 rw-p 00015000 08:01 6191352 /usr/lib/libgcc_s.so.1 7f4800f7e000-7f480107e000 r-xp 00000000 08:01 6163651 /usr/lib/libm-2.19.so 7f480107e000-7f480127d000 ---p 00100000 08:01 6163651 /usr/lib/libm-2.19.so 7f480127d000-7f480127e000 r--p 000ff000 08:01 6163651 /usr/lib/libm-2.19.so 7f480127e000-7f480127f000 rw-p 00100000 08:01 6163651 /usr/lib/libm-2.19.so 7f480127f000-7f4801365000 r-xp 00000000 08:01 6191360 /usr/lib/libstdc++.so.6.0.19 7f4801365000-7f4801564000 ---p 000e6000 08:01 6191360 /usr/lib/libstdc++.so.6.0.19 7f4801564000-7f480156c000 r--p 000e5000 08:01 6191360 /usr/lib/libstdc++.so.6.0.19 7f480156c000-7f480156e000 rw-p 000ed000 08:01 6191360 /usr/lib/libstdc++.so.6.0.19 7f480156e000-7f4801583000 rw-p 00000000 00:00 0 7f4801583000-7f48015a3000 r-xp 00000000 08:01 6163762 /usr/lib/ld-2.19.so 7f4801778000-7f480177e000 rw-p 00000000 00:00 0 7f48017a1000-7f48017a3000 rw-p 00000000 00:00 0 7f48017a3000-7f48017a4000 r--p 00020000 08:01 6163762 /usr/lib/ld-2.19.so 7f48017a4000-7f48017a5000 rw-p 00021000 08:01 6163762 /usr/lib/ld-2.19.so 7f48017a5000-7f48017a6000 rw-p 00000000 00:00 0 7fff64671000-7fff64692000 rw-p 00000000 00:00 0 [stack] 7fff646a2000-7fff646a4000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] Aborted (core dumped)

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