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[voronoi]medial axis
by Louis Lavery 29 Aug '13

29 Aug '13

Hello, I'm hoping to use boost voronoi to construct the (internal) medial axis for closed shapes (with holes). I need to work out which vertices of the voronoi are inside, outside and on a boundary. So my first goal is to determine which vertices correspond to the ends of the input segments (boundary vertices). The way I do this at the moment, is to look at each edge and test if its source vertex, vertex0(), is equal to either end point of the segment contained by the edge's cell. (1) If it is then it's a boundary vertex otherwise it's not. Is that correct? (2) When comparing a vertex with an input point can I do an exact compare (==) or should I use a tolerance (epsilon)? Thanks, fuzzy.

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[RPC] Boost.Asio to write *concurrency ready* code
by Niall Douglas 28 Aug '13

28 Aug '13

On 27 Aug 2013 at 12:00, boost-request(a)lists.boost.org wrote: > I am *not sure* if anyone else has made such discovery, anyway, > comment is welcomed. What you have discovered is well known I am afraid. Indeed, proposed Boost.AFIO from this year's GSoC implements an asynchronous chainable closure execution engine on ASIO, and you can read documentation on how AFIO is equivalent to Google's and Microsoft's WG21 closure execution engine proposals here: https://ci.nedprod.com/job/Boost.AFIO%20Build%20Documentation/Boost.AF IO_Documentation/doc/html/afio/quickstart/closure_execution_engines/ho w_boost_afio_relates_to_exisit.html Paul did up a great matrix mapping APIs from those engines to AFIO equivalents at https://ci.nedprod.com/job/Boost.AFIO%20Build%20Documentation/Boost.AF IO_Documentation/doc/html/afio/quickstart/closure_execution_engines/ho w_boost_afio_relates_to_exisit/comparison_of_afio_with_other_cl.html and https://ci.nedprod.com/job/Boost.AFIO%20Build%20Documentation/Boost.AF IO_Documentation/doc/html/afio/quickstart/closure_execution_engines/ho w_boost_afio_relates_to_exisit/other_useful_comparisons.html. If we get time before GSoC closes, we may just go ahead and implement N3562 (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3562.pdf) using AFIO as it would be incredibly trivial to do so. However, the Boost community only voted closure execution support as third most important - they ranked directory change monitoring as highest, so that's what me and Paul are implementing now. (FYI to those interested, we're going to deliver some *seriously* performant directory monitoring. Testing of our direct kernel syscall based implementation suggests watching a 1 million file entry directory for changes will actually work on Windows, albeit pegging a 3.5Ghz 4 core machine at 75-85% of all CPUs. Linux sadly lacks the syscalls to match Windows, but a 100,000 entry directory may well work just fine) Niall -- Currently unemployed and looking for work. Work Portfolio: http://careers.stackoverflow.com/nialldouglas/

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Problem with boost::function on BlackBerry10
by Jens Weller 28 Aug '13

28 Aug '13

Hi boost Community, I've got a little problem with getting boost::function to run on BlackBerry10. So far, I was able to compile, link and run successfully when I do comment out some stuff in boost. Surely not the right way to do it, but proves to me that those lines are the problem, I'm looking for a fix, maybe a define I need to add to let this compile without changing boost headers. In total its only 3 errors, where 2 boil down to the same macro: /home/jweller/cpp/libraries/boost_1_54_0/boost/type_traits/detail/cv_traits_impl.hpp:25: Parenthesis/brace mismatch between #if and #else branches; using #if branch /home/jweller/cpp/libraries/boost_1_54_0/boost/type_traits/detail/cv_traits_impl.hpp:93: Excess closing brace in C++ code (or abuse of the C++ preprocessor) /home/jweller/cpp/libraries/boost_1_54_0/boost/type_traits/msvc/typeof.hpp:43: Ignoring definition of undeclared qualified class These two are in cv_traits_impl.hpp in boost/type_traits/detail/, caused by this line: #if !(BOOST_WORKAROUND(__GNUC__,== 3) && BOOST_WORKAROUND(__GNUC_MINOR__, <= 2)) This line is twice in this fiel, hence the 2 errors. qcc version is gcc 4.6.3. It looks to me like BOOST_WORKAROUND isn't doing the right thing here to me. The 2nd error is more strange. /home/jweller/cpp/libraries/boost_1_54_0/boost/type_traits/msvc/typeof.hpp:43: Ignoring definition of undeclared qualified class Somehow typeof.hpp of msvc is getting pulled in. I've tried also the from BlackBerry provided boost version from https://github.com/blackberry/Boost, which shows exact the same errors. And is the one I (cruely) patched currently. Commenting out the #if !(is < 3.2) resolves the problem, but msvc is still pulled in. Also commenting in this header the cause out lets it compile, but thats nothing then a bad workaround. Currently I have only build for the simulator, but the problem is most likely also existing for the device build chain. At least the first two errors might be caused by BOOST_WORKAROUND, maybe there is a value that isn't configured correctly on this platform. Also how do I get closer to the source of the msvc code being dragged in? So, question is, is there maybe a define to help boost getting digested by the qcc toolchain? kind regards, Jens Weller

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Migrating lists.boost.org
by DongInn Kim 28 Aug '13

28 Aug '13

Dear Boost community, I think it is time to move mailing lists and mail archives of lists.boost.org to the new server (wowbagger.crest.iu.edu) If it is not a bad time, can we migrate the services at 9am (E.T.) on Aug 28th? Date: Wednesday, Aug 28th, 2013 Time: 6:00am-8:00am Pacific US time 7:00am-9:00am Mountain US time 8:00am-10:00am Central US time 9:00am-11:00am Eastern US time 1:00pm-3:00pm GMT The following services may not be available during the migration. - Web services (e.g., http://lists.boost.org/) - Mailing lists: boost boost-announce boost-bugs boost-build boost-cmake boost-commit boost-docs boost-interest boost-mpi boost-test boost-testing boost-users geometry glas proto threads-devel ublas Please let me know if you have any questions or concerns about this migration. Regards, -- - DongInn

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Re: [boost] [cpo-proposal] presentation of the idea
by Santiago Tapia 28 Aug '13

28 Aug '13

>Date: Tue, 13 Aug 2013 07:42:03 -0500 >From: Larry Evans <cppljevans(a)suddenlink.net> >To: boost(a)lists.boost.org >Subject: Re: [boost] [cpo-proposal] presentation of the idea > > What if the class hierarchy is used to model a graph that > contains cycles. For example, something like a spirit grammar > where a non-terminal on the rhs of a non-terminals definition? I don't see any problem, as long as they fulfill the requirements of the classifier container, i.e. the objects to be inserted should be copyable and derived from the base class in the template argument of the classifier. > Wouldn't this require some sort of smart pointer or other > garbage collection method with the ability to collect cycles? > I don't think so, the classifier container should be able to replace any occurence of something like: vector< shared_ptr <base> > in almost in any circunstance. Beside, you could avoid virtual destructors because the classifier will destroy the object directly not from a base* pointer.

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Seeking "lazy piranha fedora 19 64 intel C++11" tester's contact info
by Jim Bell 27 Aug '13

27 Aug '13

Over on the boost-testing list, we're seeking the regression tester for "lazy piranha fedora 19 64 intel C++11". Please reply directly to me (off-list) if you have contact information for this person. Thanks, -Jim

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Modular boost directory structure
by Edward Diener 27 Aug '13

27 Aug '13

I am seeing at https://svn.boost.org/trac/boost/wiki/StartModDev that the modular Boost directory structure is: simple include boost simple twice.hpp test twice_test.cpp Jamfile.v2 doc // from the notes on the page index.html Is this the latest correct information ? I am asking because the original recommended structure was, as I understood it: simple boost simple twice.hpp libs simple test twice_test.cpp Jamfile.v2 doc html index.html I want to make sure I have this right before I modularize my sandbox libraries for git using the correct directory structure. BTW I have not been able to figure out how to add and move directories using git in a local copy. Instead I have just done so using the OS and git seems to figure it out but I have a feeling I have lost git history in doing so.

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[Boost.Log] SimpleEventLog configuration
by Pieter 27 Aug '13

27 Aug '13

LS, I am currently configuring my logging configuration using a property tree. When I include a simple_event_log_backend sink, it does not seem possible (yet) to configure an event type mapping to that sink from the property tree. The source code does contain the following comment: "For now we use only the default level mapping. Will add support for configuration later." so I guess my first question would be whether such support is indeed in the works? My second question would be whether it is possible to add such a mapping after the sink was created and added to the core. In the documentation an example is given where the mapping is done before the sink is added to the core: typedef sinks::synchronous_sink< sinks::simple_event_log_backend > sink_t; boost::shared_ptr< sink_t > sink(new sink_t()); sinks::event_log::custom_event_type_mapping< severity_level > mapping("Severity"); // . define mapping here . sink->locked_backend()->set_event_type_mapper(mapping); // Add the sink to the core logging::core::get()->add_sink(sink); but in the case at hand adding the sink happens behind the scenes when using the configuration utilities. It seems to me that there is no easy way to manipulate the sink in any way once it is added to the core (unless as in the example the shared_ptr to the sink is kept to access the sink maybe). Is this correct? Many thanks, Pieter P.s. BTW, in the section "Simplified library initialization tools" of the documentation Table 1.15 seems to miss a 'Format' parameter that I assume is still needed?

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doubts about python3 support
by Neal Becker 26 Aug '13

26 Aug '13

I'm building using: bjam -d+2 -j8 cxxflags='-march=native -Wno-unused-local-typedefs' -sHAVE_ICU=1 - sEXPAT_INCLUDE=/usr -sEXPAT_LIBPATH=/usr/lib64 --layout=tagged threading=single,multi link=shared stage In user-config.jam I added: using python : 3.3 : /usr/bin/python3 : /usr/include/python3.3m ; I wind up with stage/lib/libboost_python.so stage/lib/libboost_python3.so But AFAICT, they were build the same way. It's be nice if one was built against python2 and the other python3, but that doesn't appear to be true. AFAICT, both were built from the same sources (using /usr/include/python3.3m). What I'd like is to build both python2 and python3 from the same source tree, installing the final shared libs into the same destination dir. Right now I have 2 different source trees, and build switching the one line in user- config.jam.

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MSVC doesn't support "not"?!
by Daryle Walker 26 Aug '13

26 Aug '13

Just checked the regression testing pages. Most of the testing stations that reported fails for Boost.Rational have switched to pass since I've uploaded updates. Besides the stations that haven't run new tests, and the "teeks" team that run Clang tests although it seemingly isn't actually installed, the newly-run MSVC stations report fails. The old errors are gone, but the new error is: ..\libs\rational\test\rational_test.cpp(1012) : error C2065: 'not' : undeclared identifier ..\libs\rational\test\rational_test.cpp(1012) : error C2146: syntax error : missing ')' before identifier 'dummy' ..\libs\rational\test\rational_test.cpp(1012) : error C2059: syntax error : ')' This happens with MSVC 10.0 and 11.0. Hasn't "not" been an alternate symbol for "!" since C++98? I'll change it to "!", but that doesn't excuse not fixing it for 15 years! What happened? (I think some of the MSVC authors lurk here.) Daryle W.

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