167 lines
4.4 KiB
C++
167 lines
4.4 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_INTERFACE_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_INTERFACE_HPP
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/geometries/concepts/check.hpp>
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#include <boost/geometry/algorithms/dispatch/is_simple.hpp>
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#include <boost/geometry/core/cs.hpp>
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#include <boost/geometry/strategies/default_strategy.hpp>
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#include <boost/geometry/strategies/detail.hpp>
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#include <boost/geometry/strategies/relate/services.hpp>
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namespace boost { namespace geometry
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{
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namespace resolve_strategy
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{
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template
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<
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typename Strategy,
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bool IsUmbrella = strategies::detail::is_umbrella_strategy<Strategy>::value
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>
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struct is_simple
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{
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template <typename Geometry>
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static inline bool apply(Geometry const& geometry,
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Strategy const& strategy)
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{
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return dispatch::is_simple<Geometry>::apply(geometry, strategy);
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}
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};
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template <typename Strategy>
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struct is_simple<Strategy, false>
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{
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template <typename Geometry>
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static inline bool apply(Geometry const& geometry,
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Strategy const& strategy)
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{
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using strategies::relate::services::strategy_converter;
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return dispatch::is_simple
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<
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Geometry
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>::apply(geometry, strategy_converter<Strategy>::get(strategy));
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}
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};
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template <>
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struct is_simple<default_strategy, false>
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{
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template <typename Geometry>
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static inline bool apply(Geometry const& geometry,
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default_strategy)
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{
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// NOTE: Currently the strategy is only used for Linear geometries
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typedef typename strategies::relate::services::default_strategy
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<
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Geometry, Geometry
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>::type strategy_type;
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return dispatch::is_simple<Geometry>::apply(geometry, strategy_type());
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}
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};
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} // namespace resolve_strategy
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namespace resolve_variant
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{
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template <typename Geometry>
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struct is_simple
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{
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template <typename Strategy>
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static inline bool apply(Geometry const& geometry, Strategy const& strategy)
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{
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concepts::check<Geometry const>();
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return resolve_strategy::is_simple<Strategy>::apply(geometry, strategy);
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}
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};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct is_simple<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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template <typename Strategy>
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struct visitor : boost::static_visitor<bool>
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{
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Strategy const& m_strategy;
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visitor(Strategy const& strategy)
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: m_strategy(strategy)
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{}
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template <typename Geometry>
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bool operator()(Geometry const& geometry) const
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{
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return is_simple<Geometry>::apply(geometry, m_strategy);
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}
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};
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template <typename Strategy>
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static inline bool
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apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry,
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Strategy const& strategy)
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{
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return boost::apply_visitor(visitor<Strategy>(strategy), geometry);
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}
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};
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} // namespace resolve_variant
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/*!
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\brief \brief_check{is simple}
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\ingroup is_simple
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\tparam Geometry \tparam_geometry
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\tparam Strategy \tparam_strategy{Is_simple}
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\param geometry \param_geometry
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\param strategy \param_strategy{is_simple}
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\return \return_check{is simple}
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\qbk{distinguish,with strategy}
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\qbk{[include reference/algorithms/is_simple.qbk]}
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*/
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template <typename Geometry, typename Strategy>
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inline bool is_simple(Geometry const& geometry, Strategy const& strategy)
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{
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return resolve_variant::is_simple<Geometry>::apply(geometry, strategy);
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}
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/*!
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\brief \brief_check{is simple}
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\ingroup is_simple
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\tparam Geometry \tparam_geometry
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\param geometry \param_geometry
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\return \return_check{is simple}
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\qbk{[include reference/algorithms/is_simple.qbk]}
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*/
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template <typename Geometry>
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inline bool is_simple(Geometry const& geometry)
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{
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return resolve_variant::is_simple<Geometry>::apply(geometry, default_strategy());
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_INTERFACE_HPP
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