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Conan-center package.
by Philippe Groarke 17 Nov '17

17 Nov '17

Are there any plans to release an official Boost package on Conan-Center? If not, any specific reason? It would really help Windows builds and facilitate enterprise adoption. Thank you & good day.

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Weird compilation error when using boost::geometry
by 邓尧 16 Nov '17

16 Nov '17

Hi, I have implemented my own "point" as specified by the point concept http://www.boost.org/doc/libs/1_59_0/libs/geometry/doc/html/geometry/refere… When I use it along with boost::geometry::model::polygon/multi_polygon, GCC refuses to compile, tested on GCC 4.9/5.2. What's even more weird is that CLANG 3.6 would happy accept my code. BTW, the Point implementation is part of a large project, it difficult to replace it with boost::geometry::model::point. Here is my code: Point.hpp > #ifndef RAPTOR_POINT_HPP_INCLUDED_ > > #define RAPTOR_POINT_HPP_INCLUDED_ > > >> #include <boost/mpl/int.hpp> > > #include <boost/geometry/core/access.hpp> > > #include <boost/geometry/core/cs.hpp> > > #include <boost/geometry/core/coordinate_type.hpp> > > #include <boost/geometry/core/coordinate_system.hpp> > > #include <boost/geometry/core/coordinate_dimension.hpp> > > #include <boost/geometry/geometries/polygon.hpp> > > #include <boost/geometry/multi/geometries/multi_polygon.hpp> > > >> namespace raptor { > > >> template<typename T, int tDimension = 2> > > class Point { > > public: > > Point() = default; > > >> Point(T a, T b) { > > data[0] = a; > > data[1] = b; > > } > > >> Point(T a, T b, T c) { > > data[0] = a; > > data[1] = b; > > data[2] = c; > > } > > >> T& operator [] (long index) { > > return data[index]; > > } > > >> const T& operator [] (long index) const { > > return data[index]; > > } > > >> private: > > T data[tDimension]; > > }; > > >> using CubicPoint = Point<long, 3>; > > using PlanarPoint = Point<long>; > > using SphericalPoint = Point<double>; > > >> template<typename T> > > using Polygon = boost::geometry::model::polygon<T>; > > >> template<typename T> > > using PolySet = boost::geometry::model::multi_polygon<Polygon<T>>; > > >> } // namespace raptor > > >> namespace boost { namespace geometry { namespace traits { > > >> template<typename Type, std::size_t tDimension> > > struct tag<::raptor::Point<Type, tDimension>> { > > typedef point_tag type; > > }; > > >> template<typename Type, std::size_t tDimension> > > struct coordinate_type<::raptor::Point<Type, tDimension>> { > > typedef Type type; > > }; > > >> template<typename Type, std::size_t tDimension> > > struct coordinate_system<::raptor::Point<Type, tDimension>> { > > typedef boost::geometry::cs::cartesian type; > > }; > > >> template<typename Type, std::size_t tDimension> > > struct dimension<::raptor::Point<Type, tDimension>> > > : public boost::mpl::int_<tDimension> { > > // EMPTY > > }; > > >> template<typename Type, std::size_t tDimension, std::size_t tIndex> > > struct access<::raptor::Point<Type, tDimension>, tIndex> { > > static Type get(const ::raptor::Point<Type, tDimension>& p) { > > return p[tIndex]; > > } > > >> static void set(::raptor::Point<Type, tDimension>& p, > > const Type& value) { > > p[tIndex] = value; > > } > > }; > > >> }}} // namespace boost::geometry::traits > > >> #endif // RAPTOR_POINT_HPP_INCLUDED_ > > A real simple main.cpp: > #include "Point.hpp" > > >> int main() { > > raptor::Polygon<raptor::SphericalPoint> pl; > > raptor::PolySet<raptor::SphericalPoint> set; > > return sizeof(pl) + sizeof(set); > > } > > > GCC compilation error: g++ main.cpp -std=c++14 > In file included from /usr/include/boost/geometry/core/access.hpp:20:0, from Point.hpp:5, from main.cpp:1: /usr/include/boost/geometry/core/point_type.hpp: In instantiation of > 'struct boost::geometry::traits::point_type<raptor::Point<double> >': /usr/include/boost/geometry/core/point_type.hpp:66:17: required from > 'struct boost::geometry::core_dispatch::point_type<void, > raptor::Point<double> >' /usr/include/boost/geometry/core/coordinate_type.hpp:58:62: required from > 'struct boost::geometry::core_dispatch::coordinate_type<void, > raptor::Point<double> >' /usr/include/boost/geometry/core/coordinate_type.hpp:92:25: required from > 'struct boost::geometry::coordinate_type<raptor::Point<double> >' /usr/include/boost/geometry/geometries/concepts/point_concept.hpp:90:54: > required from 'class boost::geometry::concept::Point<raptor::Point<double> > >' /usr/include/boost/concept/detail/has_constraints.hpp:32:62: required by > substitution of 'template<class Model> boost::concepts::detail::yes > boost::concepts::detail::has_constraints_(Model*, > boost::concepts::detail::wrap_constraints<Model, (& Model:: constraints)>*) > [with Model = boost::geometry::concept::Point<raptor::Point<double> >]' /usr/include/boost/concept/detail/has_constraints.hpp:42:5: required from > 'const bool > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >::value' /usr/include/boost/concept/detail/has_constraints.hpp:45:31: required > from 'struct > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >' /usr/include/boost/mpl/if.hpp:67:11: required from 'struct > boost::mpl::if_<boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >, > boost::concepts::constraint<boost::geometry::concept::Point<raptor::Point<double> > > >, boost::concepts::requirement<boost::concepts::failed************ > boost::geometry::concept::Point<raptor::Point<double> >::************> >' /usr/include/boost/concept/detail/general.hpp:50:8: required from 'struct > boost::concepts::requirement_<void > (*)(boost::geometry::concept::Point<raptor::Point<double> >)>' /usr/include/boost/geometry/geometries/ring.hpp:60:5: required from > 'class boost::geometry::model::polygon<raptor::Point<double>, true, true, > std::vector, std::vector, std::allocator, std::allocator>' main.cpp:4:42: required from here /usr/include/boost/geometry/core/point_type.hpp:45:5: error: no matching > function for call to 'assertion_failed(mpl_::failed************ > (boost::geometry::traits::point_type<raptor::Point<double> > >::NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE::************)(mpl_::assert_::types<raptor::Point<double>, > mpl_::na, mpl_::na, mpl_::na>))' BOOST_MPL_ASSERT_MSG ^ /usr/include/boost/mpl/assert.hpp:82:5: note: candidate: 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:82:5: note: template argument > deduction/substitution failed: /usr/include/boost/geometry/core/point_type.hpp:45:5: note: cannot > convert > 'boost::geometry::traits::point_type<Geometry>::NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE48::assert_arg<raptor::Point<double> > >()' (type 'mpl_::failed************ > (boost::geometry::traits::point_type<raptor::Point<double> > >::NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE::************)(mpl_::assert_::types<raptor::Point<double>, > mpl_::na, mpl_::na, mpl_::na>)') to type 'mpl_::assert<false>::type {aka > mpl_::assert<false>}' BOOST_MPL_ASSERT_MSG ^ In file included from > /usr/include/boost/geometry/core/coordinate_type.hpp:21:0, from /usr/include/boost/geometry/core/access.hpp:24, from Point.hpp:5, from main.cpp:1: /usr/include/boost/geometry/core/point_type.hpp: In instantiation of > 'struct boost::geometry::core_dispatch::point_type<void, > raptor::Point<double> >': /usr/include/boost/geometry/core/coordinate_type.hpp:58:62: required from > 'struct boost::geometry::core_dispatch::coordinate_type<void, > raptor::Point<double> >' /usr/include/boost/geometry/core/coordinate_type.hpp:92:25: required from > 'struct boost::geometry::coordinate_type<raptor::Point<double> >' /usr/include/boost/geometry/geometries/concepts/point_concept.hpp:90:54: > required from 'class boost::geometry::concept::Point<raptor::Point<double> > >' /usr/include/boost/concept/detail/has_constraints.hpp:32:62: required by > substitution of 'template<class Model> boost::concepts::detail::yes > boost::concepts::detail::has_constraints_(Model*, > boost::concepts::detail::wrap_constraints<Model, (& Model:: constraints)>*) > [with Model = boost::geometry::concept::Point<raptor::Point<double> >]' /usr/include/boost/concept/detail/has_constraints.hpp:42:5: required from > 'const bool > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >::value' /usr/include/boost/concept/detail/has_constraints.hpp:45:31: required > from 'struct > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >' /usr/include/boost/mpl/if.hpp:67:11: required from 'struct > boost::mpl::if_<boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >, > boost::concepts::constraint<boost::geometry::concept::Point<raptor::Point<double> > > >, boost::concepts::requirement<boost::concepts::failed************ > boost::geometry::concept::Point<raptor::Point<double> >::************> >' /usr/include/boost/concept/detail/general.hpp:50:8: required from 'struct > boost::concepts::requirement_<void > (*)(boost::geometry::concept::Point<raptor::Point<double> >)>' /usr/include/boost/geometry/geometries/ring.hpp:60:5: required from > 'class boost::geometry::model::polygon<raptor::Point<double>, true, true, > std::vector, std::vector, std::allocator, std::allocator>' main.cpp:4:42: required from here /usr/include/boost/geometry/core/point_type.hpp:66:17: error: no type named > 'type' in 'struct boost::geometry::traits::point_type<raptor::Point<double> > >' >::type type; ^ In file included from > /usr/include/boost/geometry/geometries/polygon.hpp:26:0, from Point.hpp:10, from main.cpp:1: /usr/include/boost/geometry/geometries/concepts/point_concept.hpp: In > instantiation of 'class > boost::geometry::concept::Point<raptor::Point<double> >': /usr/include/boost/concept/detail/has_constraints.hpp:32:62: required by > substitution of 'template<class Model> boost::concepts::detail::yes > boost::concepts::detail::has_constraints_(Model*, > boost::concepts::detail::wrap_constraints<Model, (& Model:: constraints)>*) > [with Model = boost::geometry::concept::Point<raptor::Point<double> >]' /usr/include/boost/concept/detail/has_constraints.hpp:42:5: required from > 'const bool > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >::value' /usr/include/boost/concept/detail/has_constraints.hpp:45:31: required > from 'struct > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >' /usr/include/boost/mpl/if.hpp:67:11: required from 'struct > boost::mpl::if_<boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >, > boost::concepts::constraint<boost::geometry::concept::Point<raptor::Point<double> > > >, boost::concepts::requirement<boost::concepts::failed************ > boost::geometry::concept::Point<raptor::Point<double> >::************> >' /usr/include/boost/concept/detail/general.hpp:50:8: required from 'struct > boost::concepts::requirement_<void > (*)(boost::geometry::concept::Point<raptor::Point<double> >)>' /usr/include/boost/geometry/geometries/ring.hpp:60:5: required from > 'class boost::geometry::model::polygon<raptor::Point<double>, true, true, > std::vector, std::vector, std::allocator, std::allocator>' main.cpp:4:42: required from here /usr/include/boost/geometry/geometries/concepts/point_concept.hpp:93:10: > error: 'value' is not a member of > 'boost::geometry::dimension<raptor::Point<double> >' enum { ccount = dimension<Geometry>::value }; ^ Where is the problem ? or it's a GCC bug ? Thanks

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Could guys help me on a boost MPI link error
by Renfan Luo 16 Nov '17

16 Nov '17

Hi All I have built boost binary library on my PC workstation in windows 10 using VS 2017 for boost 1.65.1 successfully for application of MPI in my project. I had a simple test for MPI which worked perfectly. So I moved to a further test using boost example "odeint-v2/examples/mpi/phase_chain.cpp", which is applied to solve ODE with MPI capacity. When I tried to build the project, it gives me an error Severity Code Description Project File Line Suppression State Error LNK1112 module machine type 'x86' conflicts with target machine type 'x64' MPI-test2 C:\Users\renfanluo\source\repos\MPI-test2\MPI-test2\libboost_mpi-vc141-mt-1_65_1.lib(environment.obj) 1 I googled, then I went to properties->Linker->Advanced->Target Machine, changed to "MachineX86 (/MACHINE:X86)", then rebuild the project, now the error changes to Severity Code Description Project File Line Suppression State Error LNK1112 module machine type 'x64' conflicts with target machine type 'x86' MPI-test2 C:\Users\renfanluo\source\repos\MPI-test2\MPI-test2\x64\Release\MPItest2.obj 1 So this shows that simply changing the target machine setting in VS will not work. Could you guys give me some indications of how to fix this problem. Best regards Renfan

2 1

Boost.Chrono custom I/O
by Leo Cacciari 15 Nov '17

15 Nov '17

Hi, I'm using boost.chrono in a project and I need some non-standard input-output. First of all, I need to print days as days. Consider the following code namespace testing { typedef boost::chrono::duration<long double,boost::ratio<86400>> day; } int main(int argc,char *argv[]) { using namespace testing; day d(10.5); std::cout << "Value: " << d << std::endl; } This prints Value: 10.5 [86400/1]seconds Which is obviously right; but I'd rather have: Value 10.5 days Obviously, a solution is to define operator<<(ostream&,const & day), however I'd rather use the facet approach, which looks like easier to extend to parsing and more flexible (e.g. allowing to print the above value as "10.5 days" somewhere and as "10.5 d" elsewhere.) If I understand the documentation, I must define a subclass of boost::chrono::duration_units and then imbue the facet into the stream. Is this right? Where can I found some guidelines on how to do that? Thanks for the help lc -- Leo Cacciari Aliae nationes servitutem pati possunt. Populi Romani est propria libertas.

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[Beast] Problems in getting started with Beast
by Sharklaser Lasershark 14 Nov '17

14 Nov '17

Hello! I'm migrating a project from libcurl to Beast. I'm trying to compile http_client_async.cpp <https://github.com/boostorg/beast/blob/develop/example/http/client/async/ht…>, but 110 errors come from "file_win32.ipp" and "file_win32.hpp", mostly missing declarations and members. I'm using Visual Studio 2017 (warning level 4). Here is what I have done: 1. Downloaded and set up boost 1.65.1 according to the "getting started" tutorial <http://www.boost.org/doc/libs/1_65_1/more/getting_started/windows.html> - Built all binaries - Verified header only example and binary-dependent example 2. Downloaded beast/include/boost <https://github.com/boostorg/beast/tree/develop/include/boost> from GitHub and moved the folder and .hpp to - C:\Program Files\boost\boost_1_65_1\boost 3. Started an empty project and pasted in the http_client_async.cpp <https://github.com/boostorg/beast/blob/develop/example/http/client/async/ht…> example. I have spent too many days trying to get this up and running. Any help would be greatly appreciated! Kind regards

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help on how to build mpi library
by Renfan Luo 14 Nov '17

14 Nov '17

I am a new user of boost and have downloaded 1.65.1 and unzipped it to my C:\local\boost_1_65_1. Then chose the "MPI nearest neighbour coupled phase chain." Example, file "phase_chain.cpp" as my first test in VS2015, I have got a link error message "Error LNK1104 cannot open file 'libboost_mpi-vc141-mt-1_65_1.lib" . I have checked the boost root directory and sub-directories and did not this library file. Hope guys can suggest how I build mpi library and install it to windows.

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Customized installation
by mahmood n 11 Nov '17

11 Nov '17

Hi, It is possible to build one or two targets instead of all? When I run ../b2 install --prefix=/somewhere It build all libraries. Assume I only want filesystem. Is that possible or they all depend on each other? Regards, Mahmood

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error categories point to invalid data with boost log and asio
by priv＠mariusherzog.net 11 Nov '17

11 Nov '17

I have the following problem while using boost asio together with boost log and clang 3.9.0. When I want to print an error code for example passed to me by a asio completion handler, my program crashes. This is because the error category points to invalid data. If I put a breakpoint in get_misc_error category which is called upon program startup, the local static error category already contains junk data. When I compile with gcc 5.4.0 this error does not occur. Also if I do not link against boost log everything works fine as well. I use linux, and link all boost libraries dynamically. Boost version is 1.62.0. Would it help if I maybe link boost log statically? Is there anything else I can do?

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[signals2] Connect to overloaded slots
by Florian Lindner 10 Nov '17

10 Nov '17

Hello, this code compiles just fine: #include <boost/signals2.hpp> #include <iostream> // void slot() { std::cout << "No args slot called." << std::endl; } void slot(int i) { std::cout << "Int " << i << " arg slot called." << std::endl; } int main(int argc, char **argv) { boost::signals2::signal<void(int)> s; s.connect(&slot); return 0; } However, when I uncomment the slot() function, it does not do so, anymore: boostsignals.cpp:78:5: error: no matching member function for call to 'connect' s.connect(&slot); ~~^~~~~~~ /usr/include/boost/signals2/detail/signal_template.hpp:689:18: note: candidate function not viable: no overload of 'slot' matching 'const boost::signals2::signal<void (int), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (int)>, boost::function<void (const boost::signals2::connection &, int)>, boost::signals2::mutex>::slot_type' (aka 'const slot<void (int), boost::function<void (int)> >') for 1st argument connection connect(const slot_type &slot, connect_position position = at_back) ^ /usr/include/boost/signals2/detail/signal_template.hpp:693:18: note: candidate function not viable: requires at least 2 arguments, but 1 was provided connection connect(const group_type &group, ^ Is there a way to make it working with overloaded slot functions? Thanks, Florian

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(no subject)
by giridhar 08 Nov '17

08 Nov '17

Hi Boost http://bit.ly/2hcH687 giridhar

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