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

[Concept.Check] BOOST_CONCEPT_ASSERT and OutputIterator
by Jens Müller 15 May '14

15 May '14

Hi, what might be wrong about this concept check? BOOST_CONCEPT_ASSERT( ( OutputIterator< std::back_insert_iterator< std::vector< bool > >, bool > ) ); It causes this compiler error: > In file included from /home/jens/hacon/build/boost-1.46.1/boost/concept/assert.hpp:36:0, > from /home/jens/hacon/build/boost-1.46.1/boost/concept_check.hpp:20, > from /home/jens/hacon/build/boost-1.46.1/boost/bimap/detail/bimap_core.hpp:31, > from /home/jens/hacon/build/boost-1.46.1/boost/bimap/bimap.hpp:61, > from /home/jens/hacon/build/boost-1.46.1/boost/bimap.hpp:13, > from src/XYZ.cpp:8: > src/xyz.cpp: In function ‘{anonymous}::triboolInheritFromAnyNeighborConverter_c<BoolOutputIterator> {anonymous}::makeTriboolInheritFromAnyNeighborConverter(BoolOutputIterator)’: > src/xyz.cpp:546:5: error: ‘*’ cannot appear in a constant-expression > BOOST_CONCEPT_ASSERT( ( OutputIterator< std::back_insert_iterator< std::vector< bool > >, bool > ) ); > ^ > src/XYZ.cpp:546:5: error: a call to a constructor cannot appear in a constant-expression > BOOST_CONCEPT_ASSERT( ( OutputIterator< std::back_insert_iterator< std::vector< bool > >, bool > ) ); > ^ > src/XYZ.cpp:546:5: error: template argument 1 is invalid > BOOST_CONCEPT_ASSERT( ( OutputIterator< std::back_insert_iterator< std::vector< bool > >, bool > ) ); > ^ > src/XYZ.cpp:546:5: error: template argument 1 is invalid > BOOST_CONCEPT_ASSERT( ( OutputIterator< std::back_insert_iterator< std::vector< bool > >, bool > ) ); > ^ > src/XYZ.cpp:546:105: error: invalid type in declaration before ‘;’ token > BOOST_CONCEPT_ASSERT( ( OutputIterator< std::back_insert_iterator< std::vector< bool > >, bool > ) ); Thanks, Jens P.S.: I of course have: #include <vector> #include <boost/concept_check.hpp> #include <boost/concept/assert.hpp>

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[ASIO] Multicast Regression?
by Aaron_Wright＠selinc.com 14 May '14

14 May '14

I previously used ASIO from Boost 1.49 to send out multicast UDP messages up to 64K bytes in size without a problem. Now with ASIO from Boost 1.55 I can't seem to send out a multicast UDP message greater than 1500 bytes. I get this error: Code=1784 Category=system Message=The supplied user buffer is not valid for the requested operation I've looked at the code between Boost 1.49 and 1.55, (basic_datagram_socket.hpp, datagram_socket_services.hpp, win_iocp_socket_service_base.hpp and ipp) and very little has changed. Am I missing something that changed between the two? I'm using Windows and Microsoft Visual Studio 2010 for both 1.49 and 1.55. Hopefully someone has an idea of where to look. Thanks. --- Aaron Wright

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[Graph] Caching Dijkstra results
by Sensei 14 May '14

14 May '14

Dear all, I need to find the shortest path from a node to another, and this operation will be performed several times with different source/destination nodes. In many cases, I would need the same source, so I was thinking about caching the results from Dijkstra. Sincerely, I don't know what I should cache. My initial thought is creating a hashmap with key being the source node, and value something that allows me to easily retrieve the path. What do you think I need to cache? Does it suffices to have a map from node index (std::size_t) to the node's predecessor map? Thanks & Cheers!

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[thread] pthread/once.cpp doesn't compile for iOS
by Igor R 14 May '14

14 May '14

I'm upgrading Boost in an iOS project form 1.53 to 1.55, and getting the following error: cc1plus: error in backend: Couldn't allocate input reg for constraint 'Q'! cc1plus: error in backend: Couldn't allocate input reg for constraint 'Q'! lipo: can't figure out the architecture type of: /var/folders/j1/9fz1wymd0xs91683nq8gzwhr0000gn/T//ccBue08f.out "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -pedantic -gdwarf-2 -fexceptions -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -pthread -arch arm -Wextra -Wno-long-long -Wno-variadic-macros -Wunused-function -arch armv7 -arch armv7s -fpermissive -pedantic -DBOOST_ALL_NO_LIB=1 -DBOOST_ATOMIC_STATIC_LINK=1 -DBOOST_SYSTEM_STATIC_LINK=1 -DBOOST_THREAD_BUILD_LIB=1 -DBOOST_THREAD_DONT_USE_CHRONO -DBOOST_THREAD_POSIX -DNDEBUG -D_LITTLE_ENDIAN -I"." -c -o "bin.v2/libs/thread/build/darwin-6.1~iphone/release/architecture-arm/link-static/macosx-version-iphone-6.1/target-os-iphone/threading-multi/pthread/once.o" "libs/thread/src/pthread/once.cpp" Is it a known issue? Is there a workaround? Thanks.

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boost::geometry::model::linestring
by alev mutlu 13 May '14

13 May '14

Hi all, I have the following code. I can correctly print the content of line_smp with boost::geometry::dsv but get strange results when I copy line_smp into a vector and then print the content of the vector. Any ideas on what I am doing wrong? bg::model::d2::point_xy p; while(rs->next()){ bg::set<0>(p, i); bg::set<1>(p, rs->getDouble("num")); i++; line +=p; } boost::geometry::simplify(line, line_smp, 0.3); std::cout<< " original: " << boost::geometry::dsv(line) << std::endl << "simplified: " <<boost::geometry::dsv(line_smp) << std::endl; std::vector<xy> v; v.clear(); std::copy(line_smp.begin(), line_smp.end(), std::back_inserter(v)); stringstream sa, ssa; for(int ia = 0; ia < v.size(); ia++){ sa << bg::get<1>(v[i]); cout << sa; sa.str(""); }

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[boost] [mpl] Hard upper limit for range_c
by Javier Dehesa 13 May '14

13 May '14

I was testing for_each and range_c and I've discovered that there's a hard limit in the range_c template. I'm attaching an example (copied from the for_each docs http://www.boost.org/doc/libs/1_55_0/libs/mpl/doc/refmanual/for-each.html) to illustrate it. This program compiles fine for me (g++ 4.9.0), but if I set NUM to a number over 890, the compilation fails. I receive an error about template instantiation depth, so I guess I could tune it in the compiler to make it work. But, anyway, why is this template recursively defined? Is it on purpose? I get that maybe range_c was intended just for small ranges, but, is it the only way it can work? Also, it only allows for statically defined range limits. Also, whenever it compiles, the bigger the number you put, the longer it takes to compile. Thanks. -- Javier Dehesa

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geomety::within not compiling for model::box
by mark meijer 13 May '14

13 May '14

Is this not supported for box type? NOT_IMPLEMENTED_FOR_THIS_TYPES Thanks for having a look, Mark typedef boost::geometry::model::d2::point_xy<int16_t, boost::geometry::cs::cartesian> FrameCoord_t; typedef boost::geometry::model::box<FrameCoord_t> FrameBox_t; FrameBox_t box1; FrameBox_t box2; boost::geometry::assign_values(box1, 10, 10, 20, 20); boost::geometry::assign_values(box2, 0, 0, 100, 100); bool is_within = boost::geometry::within(box1, box2); 15>ClCompile: 15> Main.cpp 15>G:\work\software-external\libs\Boost\boost_1_51_0\boost/geometry/strategies/within.hpp(57): error C2664: 'boost::mpl::assertion_failed' : cannot convert parameter 1 from 'boost::mpl::failed ************(__thiscall boost::geometry::strategy::within::services::default_strategy<TagContained,TagContaining,CastedTagContained,CastedTagContaining,CsTagContained,CsTagContaining,GeometryContained,GeometryContaining>::NOT_IMPLEMENTED_FOR_THIS_TYPES::* ***********)(boost::mpl::assert_::types<T1,T2>)' to 'boost::mpl::assert<false>::type' 15> with 15> [ 15> TagContained=boost::geometry::box_tag, 15> TagContaining=boost::geometry::box_tag, 15> CastedTagContained=boost::geometry::box_tag, 15> CastedTagContaining=boost::geometry::areal_tag, 15> CsTagContained=boost::geometry::cartesian_tag, 15> CsTagContaining=boost::geometry::cartesian_tag, 15> GeometryContained=Media::DetectionBox_t, 15> GeometryContaining=Media::DetectionBox_t, 15> T1=Media::DetectionBox_t, 15> T2=Media::DetectionBox_t 15> ] 15> No constructor could take the source type, or constructor overload resolution was ambiguous 15> G:\work\software-external\libs\Boost\boost_1_51_0\boost/geometry/algorithms/within.hpp(285) : see reference to class template instantiation 'boost::geometry::strategy::within::services::default_strategy<TagContained,TagContaining,CastedTagContained,CastedTagContaining,CsTagContained,CsTagContaining,GeometryContained,GeometryContaining>' being compiled 15> with 15> [ 15> TagContained=boost::geometry::box_tag, 15> TagContaining=boost::geometry::box_tag, 15> CastedTagContained=boost::geometry::box_tag, 15> CastedTagContaining=boost::geometry::areal_tag, 15> CsTagContained=boost::geometry::cartesian_tag, 15> CsTagContaining=boost::geometry::cartesian_tag, 15> GeometryContained=Media::DetectionBox_t, 15> GeometryContaining=Media::DetectionBox_t 15> ] 15> FrameProcessorVideoIq.cpp(357) : see reference to function template instantiation 'bool boost::geometry::within<Media::DetectionBox_t,Media::DetectionBox_t>(const Geometry1 &,const Geometry2 &)' being compiled 15> with 15> [ 15> Geometry1=Media::DetectionBox_t, 15> Geometry2=Media::DetectionBox_t 15> ] 15>G:\work\software-external\libs\Boost\boost_1_51_0\boost/geometry/strategies/within.hpp(57): error C2866: 'boost::geometry::strategy::within::services::default_strategy<TagContained,TagContaining,CastedTagContained,CastedTagContaining,CsTagContained,CsTagContaining,GeometryContained,GeometryContaining>::mpl_assertion_in_line_40' : a const static data member of a managed type must be initialized at the point of declaration 15> with 15> [ 15> TagContained=boost::geometry::box_tag, 15> TagContaining=boost::geometry::box_tag, 15> CastedTagContained=boost::geometry::box_tag, 15> CastedTagContaining=boost::geometry::areal_tag, 15> CsTagContained=boost::geometry::cartesian_tag, 15> CsTagContaining=boost::geometry::cartesian_tag, 15> GeometryContained=Media::DetectionBox_t, 15> GeometryContaining=Media::DetectionBox_t 15> ] 15>G:\work\software-external\libs\Boost\boost_1_51_0\boost/geometry/algorithms/within.hpp(285): error C2039: 'type' : is not a member of 'boost::geometry::strategy::within::services::default_strategy<TagContained,TagContaining,CastedTagContained,CastedTagContaining,CsTagContained,CsTagContaining,GeometryContained,GeometryContaining>' 15> with 15> [ 15> TagContained=boost::geometry::box_tag, 15> TagContaining=boost::geometry::box_tag, 15> CastedTagContained=boost::geometry::box_tag, 15> CastedTagContaining=boost::geometry::areal_tag, 15> CsTagContained=boost::geometry::cartesian_tag, 15> CsTagContaining=boost::geometry::cartesian_tag, 15> GeometryContained=Media::DetectionBox_t, 15> GeometryContaining=Media::DetectionBox_t 15> ] 15>G:\work\software-external\libs\Boost\boost_1_51_0\boost/geometry/algorithms/within.hpp(291): error C2955: 'boost::type' : use of class template requires template argument list 15> G:\work\software-external\libs\Boost\boost_1_51_0\boost/type.hpp(14) : see declaration of 'boost::type' 15> 15>Build FAILED. 15>

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DateTime library - how to count "working days"?
by qplace 13 May '14

13 May '14

I need to find a day that stands 30 working days from a specific date, ignoring holidays. Currently I am doing it like this: boost::gregorian::date lastdate; int maxdays(30); for (int i = maxdays; i != 0; --i) { // skip weekends gregorian_calendar::day_of_week_type dow = lastdate.day_of_week(); while ( (dow == Sunday ) || (dow == Saturday) ) { lastdate -= boost::gregorian::date_duration(1); dow = lastdate.day_of_week(); } lastdate -= boost::gregorian::date_duration(1); } I did not find the iterator that can do it cleaner, but may be there is one? Thanks.

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date_time output facet question
by Erik Türke 13 May '14

13 May '14

Hi all, i am trying to find out how to use date time output facet on a format like "%m-%d %T [%module:%level] %message" in a way that i get the date_time and the residual format ([%module:%level] %message). At the moment i am just getting the date and time without the rest of the format. Is there any chance to achieve that? Thanks in advance!

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date time output facet question
by Erik Türke 13 May '14

13 May '14

Hi all, i am trying to find out how to use date time output facet on a format like "%m-%d %T [%module:%level] %message" in a way that i get the date_time and the residual format ([%module:%level] %message). At the moment i am just getting the date and time without the rest of the format. Is there any chance to achieve that? Thanks in advance!

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