116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
// Copyright (c) 2013 Tel-Aviv University (Israel).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Arrangement_on_surface_2/include/CGAL/Arr_point_location_result.h $
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// $Id: Arr_point_location_result.h 254d60f 2019-10-19T15:23:19+02:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Efi Fogel <efif@post.tau.ac.il>
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#ifndef CGAL_ARR_POINT_LOCATION_RESULT_H
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#define CGAL_ARR_POINT_LOCATION_RESULT_H
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#include <CGAL/license/Arrangement_on_surface_2.h>
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#include <CGAL/disable_warnings.h>
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// The macro CGAL_ARR_POINT_LOCATION_VERSION controls which version of the
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// point location is used. Currently two values are supported:
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// 1. Point location with CGAL::Object
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// 2. Point location with boost::optional<boost::variant<...> >
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// The default value is 2.
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#if !defined(CGAL_ARR_POINT_LOCATION_VERSION)
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#define CGAL_ARR_POINT_LOCATION_VERSION 2
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#endif
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#include <CGAL/Object.h>
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#include <boost/optional.hpp>
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#include <boost/variant.hpp>
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#ifdef CGAL_CFG_BOOST_VARIANT_SWAP_BUG
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#if CGAL_ARR_POINT_LOCATION_VERSION > 1
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#include <CGAL/Arrangement_2/Arrangement_2_iterators.h>
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// workaround for this bug:
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// https://svn.boost.org/trac/boost/ticket/2839
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namespace boost{ namespace detail { namespace variant {
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template <class CI, class F, class MI, class V, class D, class C>
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inline void move_swap(
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::CGAL::I_Filtered_const_iterator<CI, F, MI, V, D, C>& lhs,
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::CGAL::I_Filtered_const_iterator<CI, F, MI, V, D, C>& rhs)
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{
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::CGAL::I_Filtered_const_iterator<CI, F, MI, V, D, C> tmp( boost::detail::variant::move(lhs) );
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lhs = boost::detail::variant::move(rhs);
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rhs = boost::detail::variant::move(tmp);
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}
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} } }
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#endif
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#endif
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namespace CGAL {
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template <typename Arrangement_>
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struct Arr_point_location_result {
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typedef Arrangement_ Arrangement_2;
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typedef typename Arrangement_2::Vertex_const_handle Vertex_const_handle;
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typedef typename Arrangement_2::Halfedge_const_handle Halfedge_const_handle;
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typedef typename Arrangement_2::Face_const_handle Face_const_handle;
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#if CGAL_ARR_POINT_LOCATION_VERSION < 2
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typedef CGAL::Object Type;
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#else
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typedef typename boost::variant<Vertex_const_handle,
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Halfedge_const_handle,
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Face_const_handle> Type;
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#endif
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typedef Type type;
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// This function returns either make_object() or a result_type constructor
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// to generate return values. The Object version takes a dummy template
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// argument, which is needed for the return of the other option, e.g.,
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// boost::optional<boost::variant> >.
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// In theory a one parameter variant could be returned, but this _could_
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// lead to conversion overhead, and so we rather go for the real type.
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// Overloads for empty returns are also provided.
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#if CGAL_ARR_POINT_LOCATION_VERSION < 2
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template<typename T>
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static
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inline CGAL::Object make_result(T t) { return CGAL::make_object(t); }
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static
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inline CGAL::Object empty_optional_result() { return CGAL::Object(); }
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template<typename T>
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const T* assign(CGAL::Object obj) const { return CGAL::object_cast<T>(&obj); }
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#else
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template<typename T>
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static
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inline Type make_result(T t) { return Type(t); }
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inline
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static
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boost::optional<Type> empty_optional_result() { return boost::optional<Type>(); }
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template<typename T>
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const T* assign(const Type& obj) const { return boost::get<T>(&obj); }
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#endif // CGAL_ARR_POINT_LOCATION_VERSION < 2
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//this one is only to remove warnings in functions
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static
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inline Type default_result(){
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CGAL_error_msg("This functions should never have been called!");
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return Type();
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}
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};
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} //namespace CGAL
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#include <CGAL/enable_warnings.h>
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#endif
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