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

Re: [boost] Review request for Boost.Align
by Glen Fernandes 28 Feb '14

28 Feb '14

Rob Stewart wrote: > Actually, you need Review Wizard approval as a review manager, and then the rest follows. *Nod*. I let Ronald know that Ahmed was kind enough to volunteer to be the review manager, and inquired about his approval, a few days ago. Hoping to hear back soon. Glen

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clang support for __sync_* intrinsics
by Peter Dimov 28 Feb '14

28 Feb '14

Does anyone know what is the earlier version of Clang that supports the __sync_* intrinsics?

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contributing to boost.ublas in gsoc 2014
by Rishabh Kumar 28 Feb '14

28 Feb '14

hello, myself Rishabh Kumar .currently I am pursuing my masters in applied mathematics from iit roorkee. I have a firm knowledge of c++ and python. i would like to contribute to boost.ublas and aspire to be one of the students of gsoc 2014.To start with , i have been following your ideas page for quite some time and i found the linear algebra vision very tempting. i have started working the library . looking forward for a good discussion on the idea and guidance from the respective mentor.

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[GSoC-2014] Has Boost been retained?
by Vicente J. Botet Escriba 28 Feb '14

28 Feb '14

Hi, all is in the title, Vicente

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[mpl] Pull request - Add constexpr to conversion operator for integral constants
by pfultz2 28 Feb '14

28 Feb '14

Hi, I added constexpr to conversion operator for integral constants, so the type traits will more closely match the type traits in C++14. Here is the pull request: https://github.com/boostorg/mpl/pull/1 Thanks, Paul Fultz II -- View this message in context: http://boost.2283326.n4.nabble.com/mpl-Pull-request-Add-constexpr-to-conver… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[interprocess] windows_intermodule_singleton breaks when calling a Debug dll from a Release executable
by Lars Hagström 27 Feb '14

27 Feb '14

Some time ago I reported this bug https://svn.boost.org/trac/boost/ticket/9262. Any ideas? /Lars

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Problem in thread or chrono: boost::this_thread::sleep_for() sometimes returns immediately on win32
by Lars Hagström 27 Feb '14

27 Feb '14

Hi, As I've just described in https://svn.boost.org/trac/boost/ticket/9720 I've had a problem with boost::this_thread::sleep_for. I'm guessing that this could be a problem with either chrono or thread. Just thought I'd post here since I don't know how much the devs check the tickets. Cheers Lars

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BGL in shared memory
by Alexandre Motin 27 Feb '14

27 Feb '14

Hello, I would like to know if BGL works in a shared memory environement. I would like to build a graph (with BGL) in a shared memory area in order to enable multiple processes to access the graph. Best regards, Alexandre Motin

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GSoC 2014 Implementation of Algorithms for Boost.
by Tejas Nikumbh 27 Feb '14

27 Feb '14

Hi Guys, I am Tejas Nikumbh, a Senior UG at IIT Bombay. I am very much interested in contributing to Boost this year. I'm primarily interested in implementing Algorithms and Data Structures or both. I have considerable experience template based data structures as well as algorithms. I'll shortly post a link to the relevant code as this discussion goes on further. Besides the traditional DS and Algos I also have in mind implementation of certain awesome data structures (like say, KDTree) to extend the Boost Libraries capabilities. I found the following algorithms to be of importance to Boost [as from the ideas page on SVN] - Radix sort - Approximate string matching - Full text search - Near Duplicate Detection (shingling) - Parallel algorithms (sort, for_each) - Algorithms for gpgpu - Kinetic scrolling I know some of the algorithms in this list and would research and provide a in depth proposal for implementation of these into boost. As of now, I'd like to know about the potential mentors for this kind of project and whether it is something that Boost is looking forward to. I am pretty enthusiastic about this project so I would like to know how high the project is on Boost's priority list. Also, I wish to start early and get a head start by implementing one simple algorithm for Boost before GSoC so that I increase my chances of being selected. Please let me know what you guys think. -- Tejas Nikumbh, Fourth Year Undergraduate, Electrical Engineering Department, IIT Bombay.

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GSoC 2014 Boost.odeint project
by SHANTANU SHAHANE 26 Feb '14

26 Feb '14

Hello, I am a pre-final year engineering student. I am interested in the project of developing implicit routines in odeint library as a part of GSoc 2014. I have experience of C++ programming and also, I have studied basic numerical methods like Euler and Runge-Kutta. I would be grateful if someone would guide me as how to proceed further as in if I need to read some reference or to code some small problem etc. Thanks in advance. Regards: Shantanu Shahane, Fourth Year Undergraduate, Dept. of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076 (India). Mobile No.: 9967330927, 9370029097

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Can we consider BOOST_DEDUCED_TYPENAME deprecated?
by Neil Groves 26 Feb '14

26 Feb '14

Hi! I'm finally getting around to spending some decent time tackling tickets on Boost.Range and I'm finding the rather verbose BOOST_DEDUCED_TYPENAME to be considerably worsening the readability of my new code. I believe this existed to cope with very old compilers which we no longer officially support in new versions of Boost. Should I continue to put this in, or is it reasonably to drop a painful workaround for such an old compiler issue? Neil Groves

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[GitHelp] (Mis-)Understanding merge
by Edward Diener 26 Feb '14

26 Feb '14

I was following Modular Boost document "Establishing a merge point after SVN Conversion" (https://svn.boost.org/trac/boost/wiki/PostCvtMergePoint) and everything appeared to go well. I did my 'merge', 'commit', and 'push' specified at the end of the document and things seemed pretty good so I was confident I had established a correct merge point. Knowing that the latest 'develop' had been pushed and tested I determined to update 'master' with the latest 'develop' prior to pushing it. So I did a merge from 'develop' to 'master' and after carefully fixing a few minor conflicts in favor of the 'develop' versions the merge was successful. Yet when I looked at the files involved I noticed that a file which was in 'develop' was not in 'master'. How can this be ? If I merge from 'develop' to 'master' are not any files in 'develop' which are not in 'master' added automatically to 'master' ? If this is not the case it seems that a 'merge' is not doing what I expect it to do. Am I really expected to have to manually add files to 'master' which are in 'develop' and not in 'master' prior to the merge, or I have I missed some 'merge' functionality that would have done this for me automatically ?

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[gsoc14] About "Boost.Functional / Monads"
by Manasij Mukherjee 26 Feb '14

26 Feb '14

Hello everyone, I am interested in working on the Monad idea posted on the project ideas page. I have some academic experience with functional languages like SML and Haskell and find monads interesting. Should I come up with some proof of concept code to show how I'd design it before submitting a proposal when it is time? Or would it be preferrable to follow boost style (which I do not have much idea about) from before starting? In that case, I'd like some pointers to boost code implementing similar stuff. Manasij Mukherjee

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[Boost-users][icl] Icl broken for c++11's hint semantics. Fix provided.
by Joachim Faulhaber 25 Feb '14

25 Feb '14

Dear Icl users, due to a subtle effect of the changed hint semantics for associative containers, the icl library is broken in versions <= 1.55.0 when used with new STL-libraries that implement the new c++11 standard. This bug is fixed in the upcoming Boost 1.56.0. (see regression tests at http://www.boost.org/development/tests/master/developer/icl.html) Since the release of boost 1.56.0 seems to take longer than planned due to restructuring efforts for modular-boost, users of Boost.Icl affected by the problem may choose to pull the fixed Boost.Icl directly from the git repository and replace your_boost_1_55_0/boost/icl with the new code. The libs/icl part does not need an update. Another possibility is to apply the patch-file diff_icl_1_55_0_and_master.patch that is attached to this post to your local boost library 1.55.0: 1. cd to your_boost_1_55_0 root directory. your_boost_1_55_0> 2. From the command line type your_boost_1_55_0> patch -p2 < diff_icl_1_55_0_and_master.patch You may check the patched library by moving to your_boost_1_55_0/libs/icl/test and run your_boost_1_55_0/libs/icl/test> bjam Sorry for the inconvenience. Best regards, Joachim P.S.: For those interested in details of the issue here is a report: The semantics of insertion with hint in associative containers changed in c++11 form insert-after-hint (c++98/03) to insert-before-hint (c++11) see e.g. proposal N1780: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1780.html so for an associative container c of type C, a value x and an iterator hint c.insert(hint, x); //tries to insert x right after hint in c++98 c.insert(hint, x); //tries to insert x before hint in c++11 In accordance with this behavior, if using the insert function std::pair<bool, iterator> C::insert(value_type const& x); (success, hint) = c.insert(x); the iterator hint of unsuccessful insertion is the matching hint, pointing to [c++98] the last element y in c that is not greater x, so x can be inserted *after* that hint. [c++11] the first element z in c that is greater than x, so x can be inserted *before* that hint. In Boost.Icl I used the returned hint-iterator of the insert function, that always returned the last overlapping interval y for an inserted interval x given the interval's exclusive-less ordering under c++98. With the changed hint semantics, this returned hint-iterator did not point to the last interval y overlapping x anymore but to the first interval z not overlapping x. Therefore the code was broken and returned false results. -- Interval Container Library [Boost.Icl] http://www.joachim-faulhaber.de

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[testing][jc-bell] Test compilation output truncated
by Andrey Semashev 25 Feb '14

25 Feb '14

Hi, I'm facing the problem with the too low limit for the compiler output size. See here: http://www.boost.org/development/tests/develop/developer/output/FBSD-64%20j… The output contains 2 warnings and part of what may be the actual error. This log is not really helpful, so I have 2 questions: 1. Can this limit be increased? 2. Can I get the full output somehow? Thanks.

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[data-structure] uncompleted data-structure/Algorithm projects
by Prabhat Kumar 23 Feb '14

23 Feb '14

Hello, I'm new to boost community and I don't know where I can find uncompleted projects on data-structure/Algorithms to work on. Please tell where I can find them and how to contribute to those projects. Thanks, Prabhat Kumar

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Boost.Odeint GSoc 2014
by Animesh Gaitonde 23 Feb '14

23 Feb '14

Hi everyone , I am Animesh Gaitonde , 4th year student from Bits-Pilani,India.My major is Electronics & Instrumentation Engineering and I am interested in contributing to Boost during GSoC 2014.I have gone through the different GSoC projects and idea's on Boost' C++ Libraries' homepage for the Summer of Code(SoC). I found the numerical library Boost.Odeint interesting.I have completed a course on Numerical Analysis and also used Boost.Odeint for algorithmic assignments.Moreover,I have been using C++ for around 3 years and I am familiar with STL and to some extent with numerical algorithms. I have gone through the documentation of Odeint and learnt about its structure.I solved a few examples and used different explicit Steppers for solving the ODE's.Currently since Odeint supports only explicit methods it would be better to expand it by adding implicit routines and also to make the existing implicit methods(Euler and Rosenbrock) independent of Boost.uBlas to have greater flexibility.I am learning about the different numeric algorithms for solving ODE's,their implementation in Odeint and along with it solving the ordinary differential equations whose solution cannot be determined analytically. I would like to get in touch with Mario Mulansky or Karsten Ahnert , the mentors for this project to provide me with further pointers for developing the proposal and any tasks which they would like to give me so that I get familiar with Odeint. Regards Animesh Gaitonde 4th year Undergraduate Bits-Pilani,Goa Campus

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[hash] Type trait for hash functions that are well distributed.
by Daniel James 23 Feb '14

23 Feb '14

Hi, I'm thinking about adding a type trait for hash functions to indicate if it's appropriate to use them with a "power of 2" hash table. This would let hash tables be more efficient when using an appropriate hash function, especially when compiling for 64 bit. Any thoughts on how this should be designed? I have a rough design in mind (similar to the allocator_traits propagation traits), but would like to hear other's ideas first. thanks, Daniel

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[testing] No test results?
by Andrey Semashev 23 Feb '14

23 Feb '14

Hi, I'm trying to see test results, but see this error instead: Error extracting file: The specified zipfile was not found. The page is: http://www.boost.org/development/tests/develop/developer/summary.html The same error is for the master branch. Is this a known problem?

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[regression] Where's boost/assert.hpp ??
by Rene Rivera 22 Feb '14

22 Feb '14

While making changes to the regression testing tools to deal with the new locations I ran into a severe blocker. It seems that nothing compiles any more because somehow "boost/assert.hpp" is no longer around and just about all Boost code depends on that one file. Where did the file go? And if was intentionally removed, why wasn't all the uses fixed by now? What's going on? -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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Review Request: Boost.Align
by Glen Fernandes 22 Feb '14

22 Feb '14

I'd like to request a formal review of Boost.Align Description: Boost.Align is a tiny library that provides alignment related utilities that several Boost libraries (Boost.Log, Boost.Smart_Ptr, etc.) re-implement themselves. Specifically it provides a function for pointer alignment (boost::align, as many vendors do not provide the C++11 std::align), functions for aligned allocation (boost::aligned_alloc, and boost:: aligned_free), and a class template for a C++ allocator that respects type (or minimum) alignment (boost::aligned_ that can serve as a replacement for std::allocator that works with over-aligned types). Source code: https://github.com/glenfe/align Documentation: http://glenfe.com/align/doc/align.html Satisfies following requirements for a fast-track review: 1. The component must be small. 2. The technique must be already in use in Boost libraries and the new component provides a common implementation. 3. A full Boost-conformant implementation is available. Thanks, Glen

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Developing a (nearly new) library possibly to be proposed for Boost
by Paul A. Bristow 22 Feb '14

22 Feb '14

I'm revisiting https://svn.boost.org/trac/boost/wiki/StartModDev to try set up a new library. I've started by trying to use the simple 'library' I created over a year ago using a previous version of this document. Is it intended that users should place their 'Boost-Wannabe' libraries in the modular-boost in /libs/mylibrary as other real Boost libraries ? When I assumed this, I found it impossible to GIT clone my existing 'simple' library into the /libs folder as it is not empty, so the 2nd line git clone <mailto:git@github.com:Beman/simple.git> git@github.com:Beman/simple.git fails. This feels the right place for Or is recommended to use some folder like sandbox/libs/mylibrary/ for one's stuff, including of course a sandbox/libs/mylibrary/include/boost/mylibrary/ to hold my .hpp files? Either way I presume I need a link from modular-boost/boost to point to sandbox/libs/mylibrary/include/ Should I provide a symbolic link /D or a hardlink (as b2 headers creates)? C:\Windows\system32>mklink /D I:\modular-boost\boost\ mylibrary I:\sandbox\libs\ mylibrary \include\boost\ mylibrary symbolic link created for I:\modular-boost\boost\ mylibrary <<===>> I:\sandbox\libs\ mylibrary \include\boost\ mylibrary seems to work. Or do I add this folder to the Include directory list? (Tiresome) Suggestions? Paul --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow(a)hetp.u-net.com

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Gsoc project discussion
by Abhishek Kumar 21 Feb '14

21 Feb '14

Hi, I am interested in participating gsoc (google summer of code) this year with Boost. I went through the ideas page and at the bottom section i found some ideas related to data-structures and algorithms. But the page said that students have to propose their own project using the ideas listed there. I need to discuss what things i can do related to the ideas as my gsoc project..? Frankly, at present i dont have any idea on what to propose, how to propose etc.. any help on this would be appreciated..! Thanks! Abhishek Kumar

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Project Idea for 2014 GSoC
by Prabhat Kumar 21 Feb '14

21 Feb '14

Hello, In forthcoming google summer of code I'm thinking of implementing *Suffix Array* data structure. As a data structure, it is widely used in areas such as data compression, bioinformatics and, in general, in any area that deals with strings and string matching problems. So I think It would be very cool to add this data structure in Boost Libraries. Here is some brief description of some method which I have planned so far :- 1) Creation of Suffix array in O(n log n ), there is a relatively easy implementation in O(n (log n)^2) using STL's sort function, but radix sort we can achieve O(n log n) .... :) 2) Longest common prefix of any two suffix in O (log n) 3) Total distinct substring of given string in O(n log n) I'll be glad to hear some suggestion. Prabhat Kumar Indian Institute of Information Technology, Allahabad , India

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[log] Default logging configuration for trivial logger
by Ben Pope 21 Feb '14

21 Feb '14

Hi, I'm using the trivial logging interface, but I need to tweak the default configuration. I want to be able to flush after every log entry, and I also want to be able to do file rolling. As far as I can tell, in order to configure it this way, I pretty much need to configure the whole thing from scratch including formatters, but I can't find the code that sets up the default logger to replicate it. Any pointers? Cheers, Ben

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