May 2015 - Boost - lists.preview.boost.org

[Voronoi] Weighted Voronoi diagram
by Sybren A. Stüvel 06 May '15

06 May '15

Dear Boost mailing list, Currently I'm working on a Voronoi-based crowd simulation system. We model crowd agents as line segments, and feed them to the Boost Voronoi library. It would be very nice if we could give different line segments different weights. Does the Boost Voronoi library support different weights for its inputs? If not (which I'm afraid is the case, as it isn't mentioned in the documentation), how difficult would it be to add support for this? Kind regards, -- Sybren A. Stüvel http://stuvelfoto.nl/ http://stuvel.eu/

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[threads] Unexpected behaviour of Thread loal storage
by Fu ji 06 May '15

06 May '15

Hello, I would like to ask if there is everything ok with my way of thinking. I have 3 solutions (projects) in MS Visual Studio. Let say: SolutionA (static lib) SolutionB (linked with Solution A) SolutionC (linked with Solution A) In Header file of solutionA I have delaration of TLS from boost static boost::thread_specific_ptr<int> TLS; And now in SolutionB I set tls (TLS.reset(uVariable)) - uVariable is integer 2 Call function from SolutionC and call TLS.get() but there is different value than 2. But when i return from function to SolutionB and call TLS.get there is everything ok (return 2). It's ok ? Why in solutionC there is no visibilty of value set in solutionB ? It's the same thread (with the same threadId). Best regards

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[tuple] Changes living in develop
by Marcel Raad 06 May '15

06 May '15

Hi, there are three commits from last year in develop that haven't been merged to master yet. Could someone merge them please? 8bdf2a9 Make tuple constructor explicit 4fb2618 Add metadata file. b4f0590 Ported documentation to boostbook I always have to apply 8bdf2a9 manually to new Boost releases.

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Re: [boost] [Boost-testing] Attempt to redeclare already registered project id '/check/predef'
by Tom Kent 06 May '15

06 May '15

On Tue, May 5, 2015 at 2:43 AM, Dmitry Moskalchuk <dm(a)crystax.net> wrote: > > Hello, > > Running tests of 'develop' branch, I've bumped with error today: > > error: at /home/cislave/.crystax/ci-boost/regression/android-19-x86-develop/test/develop/regression/x86/test/boost_bb/src/build/project.jam:1069 > error: Attempt to redeclare already registered project id '/check/predef'. > error: Original project: > error: Name: ../check/predef > error: Module: ../check/predef > error: Main id: /check/predef > error: File: ../check/predef.jam > error: Location: ../check/predef > error: New project: > error: Module: ../../predef/check/predef > error: File: ../../predef/check/predef.jam > error: Location: ../check/predef > > > It happens only when run regression tests for 'develop' branch ('master' > is OK). Is this known problem? > I'm getting the same error (which is stopping the regression run) on all my develop testers (windows and linux). Tom

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[Master project] GitHub issues disabled
by Louis Dionne 06 May '15

06 May '15

Hi, The title pretty much says it all. Is there a reason for disabling GitHub issues on the master project? Also, I'd like to know when will the master project be tagged with the 1.58.0 release. Thanks, Louis

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Re: [boost] Interest in a container which can hold multiple data types?
by James Armstrong 05 May '15

05 May '15

On 5/5/2015 7:49 PM, Joaquin M Lopez Munoz wrote: > TONGARI J <tongari95 <at> gmail.com> writes: > >> If the data sequence shows some affinity, I guess an ordered >> tuple_vector-based sequence can provide some performance benefit in >> traversal (with some crafted for_each method). >> >> That is, a sequence of [AAABBB] may be traversed faster than [ABABAB] for >> such a container, and I believe in the later case such that the types are >> uniformly distributed, vector<variant> will perform better. > I wrote something on this some time ago, maybe worth having a look at: > > http://bannalia.blogspot.com/2014/05/fast-polymorphic-collections.html > http://bannalia.blogspot.com/2014/05/fast-polymorphic-collections-with.html > Nice analysis. If we can identify different use cases, we may be able to come up with several implementations of heterogeneous containers which balance efficiency and flexibility. I think it would be an interesting project to work on and surely useful if the containers all the a similar 'feel' -- James Armstrong

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[filesystem] copy_file compilation error
by Rob Conde 05 May '15

05 May '15

In boost 1.55 the following code compiled file on visual studio 2013 and g++ 4.4.7: #include "boost/filesystem/operations.hpp" void myFunc() { using namespace boost::filesystem; copy_option opt(copy_option::overwrite_if_exists); copy_file(path("p1"),path("p2"),opt); } in boost 1.58 I get the following error on g++ 4.4.7 (Visual Studio 2013 continues to work): test.cpp: In function 'void myFunc()': test.cpp:9: error: no matching function for call to 'copy_file(boost::filesystem::path, boost::filesystem::path, boost::filesystem::copy_option&)' boost/filesystem/operations.hpp:494: note: candidates are: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&, boost::filesystem::copy_option::enum_type) boost/filesystem/operations.hpp:500: note: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&) boost/filesystem/operations.hpp:505: note: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&, boost::filesystem::copy_option::enum_type, boost::system::error_code&) boost/filesystem/operations.hpp:511: note: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&, boost::system::error_code&) is this a bug in filesystem on gcc, a bug in gcc, a non-standard behavior in visual studio 2013, or an intended change? Rob Conde

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Re: [boost] Description of pre-requisites for building Boost 1.58.0?
by Marko Asplund 05 May '15

05 May '15

On 2015-04-24 22:17:55 Ben Pope wrote: > This doesn't really answer the question, but as a practical note, you > can do: > sudo apt-get build-dep libboost* > Which will install the build dependencies for the version of Boost in > your repository, rather than the version you're trying to build, but it > should get you where you want to be most of the time. FYI, I submitted a documentation pull request for adding a short section about pre-requisite software installation: https://github.com/boostorg/boost/pull/78 marko

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Another variant type (was: [peer review queue tardiness] [was Cleaning out the Boost review queue] Review Queue member requirements)
by Nevin Liber 05 May '15

05 May '15

On 2 April 2015 at 08:13, Niall Douglas <s_sourceforge(a)nedprod.com> wrote: > I > was recently working with eggs.variant for example, and that is Boost > quality written to Boost guidelines and yet I understand there is > zero interest in it entering Boost, despite it being superior to > Boost.Variant in almost every way. I don't remember anyone asking if they'd like to see this in Boost. Could you point to a thread? Even though you claim it is superior in almost every way, if I'm reading it correctly it has one fundamental difference in that it models "at-most-one-of" vs. Boost.Variant which models "exactly-one-of". And yes, I would like to see it in Boost, because as variant gets proposed for the standard, it would be better to have a lot more user experience to help us decide that fundamental question. That certainly fits the current mission in that "We aim to establish 'existing practice' and provide reference implementations so that Boost libraries are suitable for eventual standardization." -- Nevin ":-)" Liber <mailto:nevin@eviloverlord.com> (847) 691-1404

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Interested in contributing
by suryansh tiwari 05 May '15

05 May '15

Hey I'm new, but I'd like to contribute to your organisation, can someone please guide me along? I have done some good amount of competetive programming in c++ and I am completely new to open source.

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