95 lines
2.1 KiB
C++
95 lines
2.1 KiB
C++
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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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// Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland.
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// This file was modified by Oracle on 2020.
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// Modifications copyright (c) 2020 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_STRATEGY_AREA_HPP
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#define BOOST_GEOMETRY_STRATEGY_AREA_HPP
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/static_assert.hpp>
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#include <boost/geometry/util/select_most_precise.hpp>
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namespace boost { namespace geometry
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{
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namespace strategy { namespace area
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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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// If user specified a CalculationType, use that type, whatever it is
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// and whatever the Geometry is.
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// Else, use Geometry's coordinate-type promoted to double if needed.
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template
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<
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typename Geometry,
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typename CalculationType
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>
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struct result_type
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{
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typedef CalculationType type;
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};
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template
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<
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typename Geometry
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>
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struct result_type<Geometry, void>
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: select_most_precise
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<
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typename coordinate_type<Geometry>::type,
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double
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>
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{};
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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namespace services
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{
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/*!
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\brief Traits class binding a default area strategy to a coordinate system
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\ingroup area
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\tparam Tag tag of coordinate system
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*/
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template <typename Tag>
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struct default_strategy
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{
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BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
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"Not implemented for this coordinate system.",
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Tag);
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};
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} // namespace services
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}} // namespace strategy::area
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGY_AREA_HPP
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