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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.
- // Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland.
- // 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_STRATEGIES_AREA_HPP
- #define BOOST_GEOMETRY_STRATEGIES_AREA_HPP
- #include <boost/geometry/core/coordinate_type.hpp>
- #include <boost/geometry/util/select_most_precise.hpp>
- #include <boost/mpl/assert.hpp>
- namespace boost { namespace geometry
- {
- namespace strategy { namespace area
- {
- #ifndef DOXYGEN_NO_DETAIL
- namespace detail
- {
- // If user specified a CalculationType, use that type, whatever it is
- // and whatever the Geometry is.
- // Else, use Geometry's coordinate-type promoted to double if needed.
- template
- <
- typename Geometry,
- typename CalculationType
- >
- struct result_type
- {
- typedef CalculationType type;
- };
- template
- <
- typename Geometry
- >
- struct result_type<Geometry, void>
- : select_most_precise
- <
- typename coordinate_type<Geometry>::type,
- double
- >
- {};
- } // namespace detail
- #endif // DOXYGEN_NO_DETAIL
-
- namespace services
- {
- /*!
- \brief Traits class binding a default area strategy to a coordinate system
- \ingroup area
- \tparam Tag tag of coordinate system
- */
- template <typename Tag>
- struct default_strategy
- {
- BOOST_MPL_ASSERT_MSG
- (
- false, NOT_IMPLEMENTED_FOR_THIS_COORDINATE_SYSTEM
- , (types<Tag>)
- );
- };
- } // namespace services
- }} // namespace strategy::area
- }} // namespace boost::geometry
- #endif // BOOST_GEOMETRY_STRATEGIES_AREA_HPP
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