// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2018-2020.
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// Modifications copyright (c) 2018-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// 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_UTIL_CALCULATION_TYPE_HPP
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#define BOOST_GEOMETRY_UTIL_CALCULATION_TYPE_HPP
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#include <boost/static_assert.hpp>
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#include <boost/geometry/util/select_coordinate_type.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 util
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{
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namespace detail
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{
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struct default_integral
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{
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typedef long long type;
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};
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/*!
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\details Selects the most appropriate:
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- if calculation type is specified (not void), that one is used
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- else if type is non-fundamental (user defined e.g. Boost.Multiprecision), that one
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- else if type is floating point, the specified default FP is used
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- else it is integral and the specified default integral is used
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*/
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template
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<
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typename Type,
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typename CalculationType,
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typename DefaultFloatingPointCalculationType,
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typename DefaultIntegralCalculationType
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>
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struct calculation_type
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{
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BOOST_STATIC_ASSERT((
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std::is_fundamental
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<
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DefaultFloatingPointCalculationType
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>::value
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));
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BOOST_STATIC_ASSERT((
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std::is_fundamental
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<
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DefaultIntegralCalculationType
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>::value
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));
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typedef std::conditional_t
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<
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std::is_void<CalculationType>::value,
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std::conditional_t
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<
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std::is_floating_point<Type>::value,
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typename select_most_precise
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<
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DefaultFloatingPointCalculationType,
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Type
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>::type,
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typename select_most_precise
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<
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DefaultIntegralCalculationType,
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Type
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>::type
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>,
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CalculationType
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> type;
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};
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} // namespace detail
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namespace calculation_type
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{
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namespace geometric
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{
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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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typename DefaultFloatingPointCalculationType = double,
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typename DefaultIntegralCalculationType = detail::default_integral::type
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>
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struct unary
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{
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typedef typename detail::calculation_type
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<
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typename geometry::coordinate_type<Geometry>::type,
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CalculationType,
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DefaultFloatingPointCalculationType,
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DefaultIntegralCalculationType
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>::type type;
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};
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template
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<
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typename Geometry1,
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typename Geometry2,
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typename CalculationType,
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typename DefaultFloatingPointCalculationType = double,
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typename DefaultIntegralCalculationType = detail::default_integral::type
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>
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struct binary
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{
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typedef typename detail::calculation_type
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<
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typename select_coordinate_type<Geometry1, Geometry2>::type,
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CalculationType,
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DefaultFloatingPointCalculationType,
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DefaultIntegralCalculationType
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>::type type;
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};
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/*!
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\brief calculation type (ternary, for three geometry types)
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*/
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template
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<
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typename Geometry1,
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typename Geometry2,
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typename Geometry3,
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typename CalculationType,
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typename DefaultFloatingPointCalculationType = double,
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typename DefaultIntegralCalculationType = detail::default_integral::type
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>
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struct ternary
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{
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typedef typename detail::calculation_type
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<
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typename select_most_precise
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<
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typename coordinate_type<Geometry1>::type,
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typename select_coordinate_type
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<
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Geometry2,
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Geometry3
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>::type
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>::type,
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CalculationType,
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DefaultFloatingPointCalculationType,
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DefaultIntegralCalculationType
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>::type type;
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};
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}} // namespace calculation_type::geometric
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} // namespace util
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_UTIL_CALCULATION_TYPE_HPP
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