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116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
2 years ago
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2020-2021.
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// Modifications copyright (c) 2020-2021 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
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#define BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
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#include <boost/geometry/core/closure.hpp>
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#include <boost/geometry/core/ring_type.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/iterators/closing_iterator.hpp>
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#include <boost/geometry/views/identity_view.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail
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{
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template <typename Range>
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struct closing_view
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{
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using iterator = closing_iterator<Range const>;
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using const_iterator = closing_iterator<Range const>;
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// Keep this explicit, important for nested views/ranges
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explicit inline closing_view(Range const& r)
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: m_begin(r)
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, m_end(r, true)
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{}
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inline const_iterator begin() const { return m_begin; }
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inline const_iterator end() const { return m_end; }
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private:
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const_iterator m_begin;
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const_iterator m_end;
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};
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// As template alias for now. It's possible that this should be a struct.
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// It'd also prevent instantiating the other, unneeded view.
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template
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<
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typename Range,
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closure_selector Close = geometry::closure<Range>::value
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>
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using closed_view = std::conditional_t
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<
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Close == open,
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closing_view<Range>,
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identity_view<Range>
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>;
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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/*!
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\brief View on a range, either closing it or leaving it as it is
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\details The closeable_view is used internally by the library to handle all rings,
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either closed or open, the same way. The default method is closed, all
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algorithms process rings as if they are closed. Therefore, if they are opened,
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a view is created which closes them.
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The closeable_view might be used by library users, but its main purpose is
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internally.
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\tparam Range Original range
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\tparam Close Specifies if it the range is closed, if so, nothing will happen.
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If it is open, it will iterate the first point after the last point.
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\ingroup views
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*/
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template <typename Range, closure_selector Close>
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struct closeable_view {};
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#ifndef DOXYGEN_NO_SPECIALIZATIONS
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template <typename Range>
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struct closeable_view<Range, closed>
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{
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using type = identity_view<Range>;
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};
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template <typename Range>
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struct closeable_view<Range, open>
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{
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using type = detail::closing_view<Range>;
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};
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#endif // DOXYGEN_NO_SPECIALIZATIONS
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
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