diff options
Diffstat (limited to 'boost/geometry/algorithms/length.hpp')
| -rw-r--r-- | boost/geometry/algorithms/length.hpp | 161 |
1 files changed, 125 insertions, 36 deletions
diff --git a/boost/geometry/algorithms/length.hpp b/boost/geometry/algorithms/length.hpp index de53a39e8f..6cbec5303e 100644 --- a/boost/geometry/algorithms/length.hpp +++ b/boost/geometry/algorithms/length.hpp @@ -1,8 +1,13 @@ // Boost.Geometry (aka GGL, Generic Geometry Library) -// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. -// Copyright (c) 2008-2012 Bruno Lalande, Paris, France. -// Copyright (c) 2009-2012 Mateusz Loskot, London, UK. +// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands. +// Copyright (c) 2008-2014 Bruno Lalande, Paris, France. +// Copyright (c) 2009-2014 Mateusz Loskot, London, UK. + +// This file was modified by Oracle on 2014. +// Modifications copyright (c) 2014, Oracle and/or its affiliates. + +// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. @@ -16,18 +21,32 @@ #include <iterator> +#include <boost/concept_check.hpp> #include <boost/range.hpp> +#include <boost/mpl/fold.hpp> +#include <boost/mpl/greater.hpp> #include <boost/mpl/if.hpp> +#include <boost/mpl/insert.hpp> +#include <boost/mpl/int.hpp> +#include <boost/mpl/set.hpp> +#include <boost/mpl/size.hpp> +#include <boost/mpl/transform.hpp> #include <boost/type_traits.hpp> +#include <boost/variant/apply_visitor.hpp> +#include <boost/variant/static_visitor.hpp> +#include <boost/variant/variant_fwd.hpp> + #include <boost/geometry/core/cs.hpp> #include <boost/geometry/core/closure.hpp> +#include <boost/geometry/core/tags.hpp> #include <boost/geometry/geometries/concepts/check.hpp> #include <boost/geometry/algorithms/assign.hpp> #include <boost/geometry/algorithms/detail/calculate_null.hpp> +#include <boost/geometry/algorithms/detail/multi_sum.hpp> // #include <boost/geometry/algorithms/detail/throw_on_empty_input.hpp> #include <boost/geometry/views/closeable_view.hpp> #include <boost/geometry/strategies/distance.hpp> @@ -43,9 +62,10 @@ namespace detail { namespace length { -template<typename Segment, typename Strategy> +template<typename Segment> struct segment_length { + template <typename Strategy> static inline typename default_length_result<Segment>::type apply( Segment const& segment, Strategy const& strategy) { @@ -63,14 +83,16 @@ struct segment_length \note for_each could be used here, now that point_type is changed by boost range iterator */ -template<typename Range, typename Strategy, closure_selector Closure> +template<typename Range, closure_selector Closure> struct range_length { typedef typename default_length_result<Range>::type return_type; + template <typename Strategy> static inline return_type apply( Range const& range, Strategy const& strategy) { + boost::ignore_unused_variable_warning(strategy); typedef typename closeable_view<Range const, Closure>::type view_type; typedef typename boost::range_iterator < @@ -106,35 +128,111 @@ namespace dispatch { -template <typename Tag, typename Geometry, typename Strategy> +template <typename Geometry, typename Tag = typename tag<Geometry>::type> struct length : detail::calculate_null - < - typename default_length_result<Geometry>::type, - Geometry, - Strategy - > -{}; +{ + typedef typename default_length_result<Geometry>::type return_type; + template <typename Strategy> + static inline return_type apply(Geometry const& geometry, Strategy const& strategy) + { + return calculate_null::apply<return_type>(geometry, strategy); + } +}; -template <typename Geometry, typename Strategy> -struct length<linestring_tag, Geometry, Strategy> - : detail::length::range_length<Geometry, Strategy, closed> + +template <typename Geometry> +struct length<Geometry, linestring_tag> + : detail::length::range_length<Geometry, closed> {}; // RING: length is currently 0; it might be argued that it is the "perimeter" -template <typename Geometry, typename Strategy> -struct length<segment_tag, Geometry, Strategy> - : detail::length::segment_length<Geometry, Strategy> +template <typename Geometry> +struct length<Geometry, segment_tag> + : detail::length::segment_length<Geometry> {}; +template <typename MultiLinestring> +struct length<MultiLinestring, multi_linestring_tag> : detail::multi_sum +{ + template <typename Strategy> + static inline typename default_length_result<MultiLinestring>::type + apply(MultiLinestring const& multi, Strategy const& strategy) + { + return multi_sum::apply + < + typename default_length_result<MultiLinestring>::type, + detail::length::range_length + < + typename boost::range_value<MultiLinestring>::type, + closed // no need to close it explicitly + > + >(multi, strategy); + + } +}; + + } // namespace dispatch #endif // DOXYGEN_NO_DISPATCH +namespace resolve_variant { + +template <typename Geometry> +struct length +{ + template <typename Strategy> + static inline typename default_length_result<Geometry>::type + apply(Geometry const& geometry, Strategy const& strategy) + { + return dispatch::length<Geometry>::apply(geometry, strategy); + } +}; + +template <BOOST_VARIANT_ENUM_PARAMS(typename T)> +struct length<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> > +{ + typedef typename default_length_result + < + boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> + >::type result_type; + + template <typename Strategy> + struct visitor + : static_visitor<result_type> + { + Strategy const& m_strategy; + + visitor(Strategy const& strategy) + : m_strategy(strategy) + {} + + template <typename Geometry> + inline typename default_length_result<Geometry>::type + operator()(Geometry const& geometry) const + { + return length<Geometry>::apply(geometry, m_strategy); + } + }; + + template <typename Strategy> + static inline result_type apply( + variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry, + Strategy const& strategy + ) + { + return apply_visitor(visitor<Strategy>(strategy), geometry); + } +}; + +} // namespace resolve_variant + + /*! \brief \brief_calc{length} \ingroup length @@ -147,24 +245,20 @@ struct length<segment_tag, Geometry, Strategy> \qbk{[length] [length_output]} */ template<typename Geometry> -inline typename default_length_result<Geometry>::type length( - Geometry const& geometry) +inline typename default_length_result<Geometry>::type +length(Geometry const& geometry) { concept::check<Geometry const>(); // detail::throw_on_empty_input(geometry); + // TODO put this into a resolve_strategy stage typedef typename strategy::distance::services::default_strategy < - point_tag, typename point_type<Geometry>::type + point_tag, point_tag, typename point_type<Geometry>::type >::type strategy_type; - return dispatch::length - < - typename tag<Geometry>::type, - Geometry, - strategy_type - >::apply(geometry, strategy_type()); + return resolve_variant::length<Geometry>::apply(geometry, strategy_type()); } @@ -183,19 +277,14 @@ inline typename default_length_result<Geometry>::type length( \qbk{[length_with_strategy] [length_with_strategy_output]} */ template<typename Geometry, typename Strategy> -inline typename default_length_result<Geometry>::type length( - Geometry const& geometry, Strategy const& strategy) +inline typename default_length_result<Geometry>::type +length(Geometry const& geometry, Strategy const& strategy) { concept::check<Geometry const>(); // detail::throw_on_empty_input(geometry); - - return dispatch::length - < - typename tag<Geometry>::type, - Geometry, - Strategy - >::apply(geometry, strategy); + + return resolve_variant::length<Geometry>::apply(geometry, strategy); } |