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- // 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.
- // This file was modified by Oracle on 2020-2023.
- // Modifications copyright (c) 2020-2023 Oracle and/or its affiliates.
- // Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
- // Contributed and/or modified by Adam Wulkiewicz, 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.
- // Use, modification and distribution is subject to the Boost Software License,
- // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- #ifndef BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
- #define BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
- #include <boost/geometry/core/closure.hpp>
- #include <boost/geometry/core/point_order.hpp>
- #include <boost/geometry/core/ring_type.hpp>
- #include <boost/geometry/core/tag.hpp>
- #include <boost/geometry/core/tags.hpp>
- #include <boost/geometry/iterators/closing_iterator.hpp>
- #include <boost/geometry/views/identity_view.hpp>
- namespace boost { namespace geometry
- {
- #ifndef DOXYGEN_NO_DETAIL
- namespace detail
- {
- template <typename Range>
- struct closing_view
- {
- using iterator = closing_iterator<Range const>;
- using const_iterator = closing_iterator<Range const>;
- // Keep this explicit, important for nested views/ranges
- explicit inline closing_view(Range const& r)
- : m_begin(r)
- , m_end(r, true)
- {}
- inline const_iterator begin() const { return m_begin; }
- inline const_iterator end() const { return m_end; }
- private:
- const_iterator m_begin;
- const_iterator m_end;
- };
- template
- <
- typename Range,
- closure_selector Close = geometry::closure<Range>::value
- >
- struct closed_view
- : identity_view<Range>
- {
- explicit inline closed_view(Range const& r)
- : identity_view<Range const>(r)
- {}
- };
- template <typename Range>
- struct closed_view<Range, open>
- : closing_view<Range>
- {
- explicit inline closed_view(Range const& r)
- : closing_view<Range const>(r)
- {}
- };
- } // namespace detail
- #endif // DOXYGEN_NO_DETAIL
- /*!
- \brief View on a range, either closing it or leaving it as it is
- \details The closeable_view is used internally by the library to handle all rings,
- either closed or open, the same way. The default method is closed, all
- algorithms process rings as if they are closed. Therefore, if they are opened,
- a view is created which closes them.
- The closeable_view might be used by library users, but its main purpose is
- internally.
- \tparam Range Original range
- \tparam Close Specifies if it the range is closed, if so, nothing will happen.
- If it is open, it will iterate the first point after the last point.
- \ingroup views
- */
- template <typename Range, closure_selector Close>
- struct closeable_view {};
- #ifndef DOXYGEN_NO_SPECIALIZATIONS
- template <typename Range>
- struct closeable_view<Range, closed>
- {
- using type = identity_view<Range>;
- };
- template <typename Range>
- struct closeable_view<Range, open>
- {
- using type = detail::closing_view<Range>;
- };
- #endif // DOXYGEN_NO_SPECIALIZATIONS
- #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
- namespace traits
- {
- template <typename Range, closure_selector Close>
- struct tag<geometry::detail::closed_view<Range, Close> >
- : geometry::tag<Range>
- {};
- template <typename Range, closure_selector Close>
- struct point_order<geometry::detail::closed_view<Range, Close> >
- : geometry::point_order<Range>
- {};
- template <typename Range, closure_selector Close>
- struct closure<geometry::detail::closed_view<Range, Close> >
- {
- static const closure_selector value = closed;
- };
- } // namespace traits
- #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
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