id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6021	Cannot compile code to compute convex hull of multipoint geometry	Crispin Cooper <cooperch@…>	Barend Gehrels	"Hello once again...

Attached is a program to compute the convex hull of a multipoint geometry.  Compilation fails (msvc).  

Compilation works if either a polygon is used instead of a multipoint, or the convex_hull function is not called.

Compiler output pasted below.

Many thanks for developing this useful library, I hope this is me failing to use it correctly rather than problems your end!

1>------ Build started: Project: boost_geom_test, Configuration: Debug Win32 ------
1>Compiling...
1>boost_geom_test_no_multipoint.cpp
1>d:\boost\boost_1_47_0\boost\geometry\algorithms\detail\for_each_range.hpp(115) : error C2039: 'apply' : is not a member of 'boost::geometry::dispatch::for_each_range<Tag,Geometry,Actor,IsConst>'
1>        with
1>        [
1>            Tag=boost::geometry::multi_point_tag,
1>            Geometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            Actor=boost::geometry::strategy::convex_hull::detail::get_extremes<range_type,range_iterator,boost::geometry::less<boost::geometry::model::d2::point_xy<float>,0>,boost::geometry::greater<boost::geometry::model::d2::point_xy<float>,0>>,
1>            IsConst=true
1>        ]
1>        d:\boost\boost_1_47_0\boost\geometry\strategies\agnostic\hull_graham_andrew.hpp(294) : see reference to function template instantiation 'void boost::geometry::detail::for_each_range<InputGeometry,boost::geometry::strategy::convex_hull::detail::get_extremes<InputRange,RangeIterator,StrategyLess,StrategyGreater>>(const Geometry &,Actor &)' being compiled
1>        with
1>        [
1>            InputGeometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            InputRange=range_type,
1>            RangeIterator=range_iterator,
1>            StrategyLess=boost::geometry::less<boost::geometry::model::d2::point_xy<float>,0>,
1>            StrategyGreater=boost::geometry::greater<boost::geometry::model::d2::point_xy<float>,0>,
1>            Geometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            Actor=boost::geometry::strategy::convex_hull::detail::get_extremes<range_type,range_iterator,boost::geometry::less<boost::geometry::model::d2::point_xy<float>,0>,boost::geometry::greater<boost::geometry::model::d2::point_xy<float>,0>>
1>        ]
1>        d:\boost\boost_1_47_0\boost\geometry\strategies\agnostic\hull_graham_andrew.hpp(274) : while compiling class template member function 'void boost::geometry::strategy::convex_hull::graham_andrew<InputGeometry,OutputPoint>::apply(const InputGeometry &,boost::geometry::strategy::convex_hull::graham_andrew<InputGeometry,OutputPoint>::partitions &) const'
1>        with
1>        [
1>            InputGeometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            OutputPoint=point_type
1>        ]
1>        d:\boost\boost_1_47_0\boost\geometry\algorithms\convex_hull.hpp(179) : see reference to class template instantiation 'boost::geometry::strategy::convex_hull::graham_andrew<InputGeometry,OutputPoint>' being compiled
1>        with
1>        [
1>            InputGeometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            OutputPoint=point_type
1>        ]
1>        d:\test\boost_geom_test\boost_geom_test_no_multipoint.cpp(20) : see reference to function template instantiation 'void boost::geometry::convex_hull<boost::geometry::model::multi_point<Point>,boost::geometry::model::polygon<Point>>(const Geometry1 &,Geometry2 &)' being compiled
1>        with
1>        [
1>            Point=boost::geometry::model::d2::point_xy<float>,
1>            Geometry1=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            Geometry2=boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<float>>
1>        ]
1>d:\boost\boost_1_47_0\boost\geometry\algorithms\detail\for_each_range.hpp(115) : error C3861: 'apply': identifier not found
1>d:\boost\boost_1_47_0\boost\geometry\algorithms\detail\for_each_range.hpp(115) : error C2039: 'apply' : is not a member of 'boost::geometry::dispatch::for_each_range<Tag,Geometry,Actor,IsConst>'
1>        with
1>        [
1>            Tag=boost::geometry::multi_point_tag,
1>            Geometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            Actor=boost::geometry::strategy::convex_hull::detail::assign_range<range_type,range_iterator,std::vector<boost::geometry::model::d2::point_xy<float>,std::allocator<boost::geometry::model::d2::point_xy<float>>>,boost::geometry::strategy::side::side_by_triangle<void>>,
1>            IsConst=true
1>        ]
1>        d:\boost\boost_1_47_0\boost\geometry\strategies\agnostic\hull_graham_andrew.hpp(307) : see reference to function template instantiation 'void boost::geometry::detail::for_each_range<InputGeometry,boost::geometry::strategy::convex_hull::detail::assign_range<InputRange,RangeIterator,Container,SideStrategy>>(const Geometry &,Actor &)' being compiled
1>        with
1>        [
1>            InputGeometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            InputRange=range_type,
1>            RangeIterator=range_iterator,
1>            Container=std::vector<boost::geometry::model::d2::point_xy<float>,std::allocator<boost::geometry::model::d2::point_xy<float>>>,
1>            SideStrategy=boost::geometry::strategy::side::side_by_triangle<void>,
1>            Geometry=boost::geometry::model::multi_point<boost::geometry::model::d2::point_xy<float>>,
1>            Actor=boost::geometry::strategy::convex_hull::detail::assign_range<range_type,range_iterator,std::vector<boost::geometry::model::d2::point_xy<float>,std::allocator<boost::geometry::model::d2::point_xy<float>>>,boost::geometry::strategy::side::side_by_triangle<void>>
1>        ]
1>d:\boost\boost_1_47_0\boost\geometry\algorithms\detail\for_each_range.hpp(115) : error C3861: 'apply': identifier not found
1>Build log was saved at ""file://d:\test\boost_geom_test\Debug\BuildLog.htm""
1>boost_geom_test - 4 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
"	Bugs	closed	Boost 1.49.0	geometry	Boost 1.47.0	Showstopper	fixed	convex hull multipoint