288 lines
7.4 KiB
C++
288 lines
7.4 KiB
C++
// Boost.Geometry
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// Copyright (c) 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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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_UTIL_ALGORITHM_HPP
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#define BOOST_GEOMETRY_UTIL_ALGORITHM_HPP
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#include <boost/geometry/util/type_traits_std.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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// Other implementations can be found in the history of this file.
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// The discussion and benchmarks can be found here:
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// https://github.com/boostorg/geometry/pull/827
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// O(logN) version 2
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template <std::size_t N>
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struct for_each_index_impl2
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{
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static const std::size_t N1 = N / 2;
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static const std::size_t N2 = N - N1;
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template <std::size_t Offset, typename UnaryFunction>
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constexpr static inline void apply(UnaryFunction& function)
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{
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for_each_index_impl2<N1>::template apply<Offset>(function);
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for_each_index_impl2<N2>::template apply<Offset + N1>(function);
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}
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};
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template <>
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struct for_each_index_impl2<3>
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{
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template <std::size_t Offset, typename UnaryFunction>
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constexpr static inline void apply(UnaryFunction& function)
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{
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function(util::index_constant<Offset>());
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function(util::index_constant<Offset + 1>());
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function(util::index_constant<Offset + 2>());
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}
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};
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template <>
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struct for_each_index_impl2<2>
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{
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template <std::size_t Offset, typename UnaryFunction>
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constexpr static inline void apply(UnaryFunction& function)
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{
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function(util::index_constant<Offset>());
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function(util::index_constant<Offset + 1>());
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}
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};
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template <>
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struct for_each_index_impl2<1>
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{
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template <std::size_t Offset, typename UnaryFunction>
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constexpr static inline void apply(UnaryFunction& function)
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{
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function(util::index_constant<Offset>());
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}
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};
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template <>
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struct for_each_index_impl2<0>
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{
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template <std::size_t Offset, typename UnaryFunction>
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constexpr static inline void apply(UnaryFunction& )
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{}
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};
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// Interface
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template <std::size_t N, typename UnaryFunction>
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constexpr inline UnaryFunction for_each_index(UnaryFunction function)
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{
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for_each_index_impl2
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<
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N
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>::template apply<0>(function);
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return function;
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}
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template <typename Geometry, typename UnaryFunction>
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constexpr inline UnaryFunction for_each_dimension(UnaryFunction function)
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{
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for_each_index_impl2
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<
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geometry::dimension<Geometry>::value
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>::template apply<0>(function);
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return function;
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}
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// ----------------------------------------------------------------------------
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// O(logN) version 2
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template <std::size_t N>
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struct all_indexes_of_impl2
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{
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static const std::size_t N1 = N / 2;
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static const std::size_t N2 = N - N1;
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return all_indexes_of_impl2<N1>::template apply<Offset>(predicate)
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&& all_indexes_of_impl2<N2>::template apply<Offset + N1>(predicate);
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}
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};
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template <>
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struct all_indexes_of_impl2<3>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return predicate(util::index_constant<Offset>())
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&& predicate(util::index_constant<Offset + 1>())
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&& predicate(util::index_constant<Offset + 2>());
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}
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};
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template <>
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struct all_indexes_of_impl2<2>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return predicate(util::index_constant<Offset>())
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&& predicate(util::index_constant<Offset + 1>());
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}
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};
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template <>
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struct all_indexes_of_impl2<1>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return predicate(util::index_constant<Offset>());
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}
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};
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template <>
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struct all_indexes_of_impl2<0>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& )
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{
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return true;
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}
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};
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// Interface
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template <std::size_t N, typename UnaryPredicate>
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constexpr inline bool all_indexes_of(UnaryPredicate predicate)
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{
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return all_indexes_of_impl2<N>::template apply<0>(predicate);
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}
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template <typename Geometry, typename UnaryPredicate>
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constexpr inline bool all_dimensions_of(UnaryPredicate predicate)
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{
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return all_indexes_of_impl2
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<
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geometry::dimension<Geometry>::value
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>::template apply<0>(predicate);
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}
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// ----------------------------------------------------------------------------
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// O(logN) version 2
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template <std::size_t N>
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struct any_index_of_impl2
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{
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static const std::size_t N1 = N / 2;
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static const std::size_t N2 = N - N1;
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return any_index_of_impl2<N1>::template apply<Offset>(predicate)
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|| any_index_of_impl2<N2>::template apply<Offset + N1>(predicate);
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}
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};
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template <>
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struct any_index_of_impl2<3>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return predicate(util::index_constant<Offset>())
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|| predicate(util::index_constant<Offset + 1>())
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|| predicate(util::index_constant<Offset + 2>());
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}
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};
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template <>
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struct any_index_of_impl2<2>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return predicate(util::index_constant<Offset>())
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|| predicate(util::index_constant<Offset + 1>());
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}
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};
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template <>
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struct any_index_of_impl2<1>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& predicate)
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{
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return predicate(util::index_constant<Offset>());
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}
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};
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template <>
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struct any_index_of_impl2<0>
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{
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template <std::size_t Offset, typename UnaryPredicate>
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constexpr static inline bool apply(UnaryPredicate& )
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{
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return false;
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}
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};
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// Interface
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template <std::size_t N, typename UnaryPredicate>
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constexpr inline bool any_index_of(UnaryPredicate predicate)
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{
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return any_index_of_impl2<N>::template apply<0>(predicate);
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}
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template <typename Geometry, typename UnaryPredicate>
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constexpr inline bool any_dimension_of(UnaryPredicate predicate)
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{
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return any_index_of_impl2
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<
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geometry::dimension<Geometry>::value
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>::template apply<0>(predicate);
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}
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template <std::size_t N, typename UnaryPredicate>
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constexpr inline bool none_index_of(UnaryPredicate predicate)
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{
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return ! any_index_of_impl2<N>::template apply<0>(predicate);
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}
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template <typename Geometry, typename UnaryPredicate>
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constexpr inline bool none_dimension_of(UnaryPredicate predicate)
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{
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return ! any_index_of_impl2
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<
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geometry::dimension<Geometry>::value
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>::template apply<0>(predicate);
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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 boost::geometry
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#endif // BOOST_GEOMETRY_UTIL_ALGORITHM_HPP
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