April 2014 - Boost-users - lists.preview.boost.org

can not compile nearest neighbors in d dimensions
by Georgios Samaras 16 Apr '14

16 Apr '14

I can not create a point in d(in the code M is dimensions) dimensions. The error is this: error: the value of ‘M’ is not usable in a constant expression note: ‘int M’ is not const error: template argument 2 is invalid and the line is this: int M; .. typedef bg::model::point<float, M, bg::cs::cartesian> point; Then, I am trying to create an Rtree (I have already the data in a 2D array), like this: // create the rtree using default constructor bgi::rtree< point, bgi::quadratic<16> > rtree; point tmp; for ( unsigned i = 0 ; i < N ; ++i ) { // insert new value for(int j = 0 ; j < M ; ++j) { bg::set<M>(tmp, a[i][j]); } rtree.insert(tmp); } and I think the error is in insert(). I am attaching a file with the minimal code and one with the errors I receive (I receive another one too). I am struggling to achieve that all day long. :/

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Interprenting nearest's neighbor's output
by Georgios Samaras 15 Apr '14

15 Apr '14

I am running the code found here http://www.boost.org/doc/libs/1_54_0_beta1/libs/geometry/doc/html/geometry/… (not the intersect query, only the nn). The output is this: " knn query point: POINT(0 0) knn query result: POLYGON((4 4,4 4.5,4.5 4.5,4.5 4,4 4)) - 4 POLYGON((3 3,3 3.5,3.5 3.5,3.5 3,3 3)) - 3 POLYGON((2 2,2 2.5,2.5 2.5,2.5 2,2 2)) - 2 POLYGON((0 0,0 0.5,0.5 0.5,0.5 0,0 0)) - 0 POLYGON((1 1,1 1.5,1.5 1.5,1.5 1,1 1)) - 1 " What are the integers on the right? Indices of the polygons? Actually is not really clear to me what are we inserting in the tree..I tried finding some documentation on these methods, but I only found info on how to call them... What I want, is simply inserting some points in the tree and then search for nn of a query point. Thanks in advance, George

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[Boost-Interprocess] Suggested approach for message_queue with dynamically sized messages
by Rob Conde 14 Apr '14

14 Apr '14

I want to use boost::interprocess and message_queue...however, the need to specify a max message size is an inhibitor because my message data doesn't necessarily have a limit in size. What is the suggested approach for this scenario? The best I can think of at the moment is to have a "start object" and "stop object" message, and then a "data" message. Then I just send the object in chunks of max_msg_size and reconstitute on the other side. This is all quite possible of course, but if there was a prescribed way to handle this without opening myself to these complexities it would be nice. Thanks in advance, Rob Conde

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Boost Universal Build
by •°o.O sαмι O.o°• 14 Apr '14

14 Apr '14

Hi, I am trying to build boost for all Mac platforms universally, I am having PPC and Intel architecture both. I am using this command to build boost 1_46_1. * ./bjam architecture=combined address-model=32_64 * and got following errors for almost every file: *./boost/python/detail/make_tuple.hpp:25: error: no matching function for call to \'91incref(<type error>)\'92\./boost/python/detail/make_tuple.hpp:25: error: \'91class boost::python::tuple\'92 has no member named \'91ptr\'92\ ./boost/python/detail/make_tuple.hpp:25: error: there are no arguments to \'91PyTuple_SET_ITEM\'92 that depend on a template parameter, so a declaration of \'91PyTuple_SET_ITEM\'92 must be available\* and "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -dynamic -no-cpp-precomp -gdwarf-2 -Wno-long-double -fPIC -arch i386 -arch ppc -arch x86_64 -DBOOST_ALL_NO_LIB=1 -DBOOST_PYTHON_SOURCE -DNDEBUG -I"." -I"/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6" -c -o "bin.v2/libs/python/build/darwin-4.0.1/release/address-model-32_64/architecture-combined/threading-multi/object/stl_iterator.o" "libs/python/src/object/stl_iterator.cpp"\ \ *...failed darwin.compile.c++ bin.v2/libs/python/build/darwin-4.0.1/release/address-model-32_64/architecture-combined/threading-multi/object/stl_iterator.o...\* please help me out if I am doing anything wrong or there is any other way of doing this. kind regards;

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Re: [Boost-users] Is selective header including supposed to work?
by Johannes Lorenz 14 Apr '14

14 Apr '14

Joel de Guzman wrote: > It should work, but the savings in compile time will be minimal. > If you want to reduce compile and build time, follow the example > in the compiler tutorial from calc7 up. The trick is to modularize > your grammars and put the definitions in separate cpp files (TUs). I think I start getting how it works. However, the dependency between statement and expression is not circular in calc7: expression seems to have no knowledge about statement. So if my dependency is circular (like e.g. expression and factor in calc2_ast), is it possible to separate them, as you suggest? Also, is there any documentation for calc7 or about TUs (what does TU mean?)? Again, many thanks for your kind answers.

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Call for Papers for Meeting C++ 2014 - one more week
by Jens Weller 13 Apr '14

13 Apr '14

Hello boost community, there is one week left to submit your talk to Meeting C++ 2014: http://meetingcpp.com/index.php/submit-your-talk.html Newsentry at Meeting C++ http://meetingcpp.com/index.php/newsreader/items/call-for-papers-one-more-w… So far 20 talks are submitted, a few of them also cover boost, most C++11/Modern C++. I also could announce the keynotes yesterday: Opening Keynote - Scott Meyers Closing Keynote - Hartmut Kaiser thanks, Jens

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phoenix bind vs boost bind?
by Robert Dailey 13 Apr '14

13 Apr '14

First of all, I'm using boost 1.55.0 on MSVC9. I've been using boost::phoenix in various places in my code base for easier usage of std::for_each and friends. However, I do not create lazy functions for a lot of the functions I bind to because they are only needed in one place most of the time. As a result, I use boost::phoenix::bind the same as I'd use boost::bind(). However I have read in various places that boost::bind is being deprecated. I'm not sure if there is truth to this, but is there a reason to choose one over the other? Is phx::bind() basically an "upgrade" to boost::bind? If I intermingle them, I have a lot of issues out of placeholder ambiguities that results in more boilerplate code (i.e. using boost::phoenix::placeholders::_1 everywhere). Any tips? I haven't used boost in a few years so I just want to make sure I'm not using it incorrectly. Thanks in advance.

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Is selective header including supposed to work?
by Johannes Lorenz 12 Apr '14

12 Apr '14

Hello, I like Qi, but the compile times are terrible sometimes. My example is similar to this in [1], but it needs 3x as much time to compile. I thought this problem might be omitted by including selectively what is needed. So I went into [1] and replaced #include <boost/spirit/include/qi.hpp> by #include <boost/spirit/include/qi_action.hpp> #include <boost/spirit/include/qi_grammar.hpp> #include <boost/spirit/include/qi_uint.hpp> #include <boost/spirit/include/qi_char.hpp> . I got far, but then, there comes up a long error message, beginning like in [2]. My questions are: * is selectively including from "boost/spirit/include" supposed to work, or should this never be done? * if it should work, what is still left to be included in my case? My version of boost is 1.53. Many thanks on advance. Kind regards, Johannes [1] http://www.boost.org/doc/libs/1_41_0/libs/spirit/example/qi/calc2_ast.cpp [2] [...]/usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:176:13: error: no matching function for call to ‘assertion_failed[...] /usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:176:13: note: candidate is: /usr/include/boost/mpl/assert.hpp:79:5: note: template<bool C> int mpl_::assertion_failed(typename mpl_::assert<C>::type) int assertion_failed( typename assert<C>::type ); ^ /usr/include/boost/mpl/assert.hpp:79:5: note: template argument deduction/substitution failed:[...]

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Re: [Boost-users] Is selective header including supposed to work?
by Johannes Lorenz 12 Apr '14

12 Apr '14

Hi, > #include <boost/spirit/include/qi_operator.hpp> sadly, it did not. It did for the AST example, but it does not for mine I uploaded the code on github [3 (mostly) and 4]. Can you please help me with this file? Is there any generic approach if you hit such errors? > BTW, if you care about the compile time, there's Spirit X3 in develope > which utilizes c++11/14 and it claims to compile faster. I am really looking forward to this Regards, Johannes [3] https://github.com/JohannesLorenz/sca-toolsuite/blob/master/src/res/equatio… [4] https://github.com/JohannesLorenz/sca-toolsuite/blob/master/src/res/equatio…

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Building Boost from Modular Boost Repository
by Baptiste Wicht 11 Apr '14

11 Apr '14

Hi, I wanted to test some experimental features of Boost Spirit X3, so I tried to install Boost from the "Modular Boost" Git repository, but without success. I followed the instructions on https://svn.boost.org/trac/boost/wiki/TryModBoost and the b2 command failed: /home/wichtounet/src/modular-boost/tools/build/src/build/feature.jam:493: > in feature.validate-value-string from module feature > error: "none" is not a known value of feature <optimization> > error: legal values: "off" "speed" "space" > /home/wichtounet/src/modular-boost/tools/build/src/build/property.jam:273: > in validate1 from module property > /home/wichtounet/src/modular-boost/tools/build/src/build/property.jam:299: > in property.validate from module property > /home/wichtounet/src/modular-boost/tools/build/src/tools/builtin.jam:377: > in variant from module builtin > /usr/share/boost-build/site-config.jam:9: in modules.load from module > site-config > /home/wichtounet/src/modular-boost/tools/build/src/build-system.jam:249: > in load-config from module build-system > /home/wichtounet/src/modular-boost/tools/build/src/build-system.jam:351: > in load-configuration-files from module build-system > /home/wichtounet/src/modular-boost/tools/build/src/build-system.jam:524: > in load from module build-system > /home/wichtounet/src/modular-boost/tools/build/src/kernel/modules.jam:289: > in import from module modules > /home/wichtounet/src/modular-boost/tools/build/src/kernel/bootstrap.jam:139: > in boost-build from module > /home/wichtounet/src/modular-boost/boost-build.jam:17: in module scope > from module > I tried adding optimization=speed on the command line, but it didn't changed a thing. I tried the master and develop branches. Is there some configuration that is necessary ? Or is there another procedure to follow ? Thanks -- Baptiste Wicht, HES-SO University of applied Sciences My personal website - http://baptiste-wicht.com

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