// Boost.Geometry Index // // Copyright (c) 2011-2014 Adam Wulkiewicz, Lodz, Poland. // // 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_INDEX_EQUAL_TO_HPP #define BOOST_GEOMETRY_INDEX_EQUAL_TO_HPP #include <boost/geometry/algorithms/equals.hpp> #include <boost/geometry/index/indexable.hpp> namespace boost { namespace geometry { namespace index { namespace detail { template <typename Geometry, typename Tag = typename geometry::tag<Geometry>::type> struct equals { inline static bool apply(Geometry const& g1, Geometry const& g2) { return geometry::equals(g1, g2); } }; template <typename T> struct equals<T, void> { inline static bool apply(T const& v1, T const& v2) { return v1 == v2; } }; template <typename Tuple, size_t I, size_t N> struct tuple_equals { inline static bool apply(Tuple const& t1, Tuple const& t2) { typedef typename boost::tuples::element<I, Tuple>::type T; return equals<T>::apply(boost::get<I>(t1), boost::get<I>(t2)) && tuple_equals<Tuple, I+1, N>::apply(t1, t2); } }; template <typename Tuple, size_t I> struct tuple_equals<Tuple, I, I> { inline static bool apply(Tuple const&, Tuple const&) { return true; } }; // TODO: Consider this: Since equal_to<> is using geometry::equals() it's possible that // two compared Indexables are not exactly the same! They will be spatially equal // but not strictly equal. Consider 2 Segments with reversed order of points. // Therefore it's possible that during the Value removal different value will be // removed than the one that was passed. /*! \brief The function object comparing Values. It compares Geometries using geometry::equals() function. Other types are compared using operator==. The default version handles Values which are Indexables. This template is also specialized for std::pair<T1, T2> and boost::tuple<...>. \tparam Value The type of objects which are compared by this function object. \tparam IsIndexable If true, Values are compared using boost::geometry::equals() functions. */ template <typename Value, bool IsIndexable = is_indexable<Value>::value> struct equal_to { /*! \brief The type of result returned by function object. */ typedef bool result_type; /*! \brief Compare values. If Value is a Geometry geometry::equals() function is used. \param l First value. \param r Second value. \return true if values are equal. */ inline bool operator()(Value const& l, Value const& r) const { return detail::equals<Value>::apply(l ,r); } }; /*! \brief The function object comparing Values. This specialization compares values of type std::pair<T1, T2>. It compares pairs' first values, then second values. \tparam T1 The first type. \tparam T2 The second type. */ template <typename T1, typename T2> struct equal_to<std::pair<T1, T2>, false> { /*! \brief The type of result returned by function object. */ typedef bool result_type; /*! \brief Compare values. If pair<> Value member is a Geometry geometry::equals() function is used. \param l First value. \param r Second value. \return true if values are equal. */ inline bool operator()(std::pair<T1, T2> const& l, std::pair<T1, T2> const& r) const { return detail::equals<T1>::apply(l.first, r.first) && detail::equals<T2>::apply(l.second, r.second); } }; /*! \brief The function object comparing Values. This specialization compares values of type boost::tuple<...>. It compares all members of the tuple from the first one to the last one. */ template <typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9> struct equal_to<boost::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>, false> { typedef boost::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> value_type; /*! \brief The type of result returned by function object. */ typedef bool result_type; /*! \brief Compare values. If tuple<> Value member is a Geometry geometry::equals() function is used. \param l First value. \param r Second value. \return true if values are equal. */ inline bool operator()(value_type const& l, value_type const& r) const { return detail::tuple_equals< value_type, 0, boost::tuples::length<value_type>::value >::apply(l ,r); } }; }}}} // namespace boost::geometry::index::detail #if !defined(BOOST_NO_CXX11_HDR_TUPLE) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) #include <tuple> namespace boost { namespace geometry { namespace index { namespace detail { template <typename Tuple, size_t I, size_t N> struct std_tuple_equals { inline static bool apply(Tuple const& t1, Tuple const& t2) { typedef typename std::tuple_element<I, Tuple>::type T; return equals<T>::apply(std::get<I>(t1), std::get<I>(t2)) && std_tuple_equals<Tuple, I+1, N>::apply(t1, t2); } }; template <typename Tuple, size_t I> struct std_tuple_equals<Tuple, I, I> { inline static bool apply(Tuple const&, Tuple const&) { return true; } }; /*! \brief The function object comparing Values. This specialization compares values of type std::tuple<Args...>. It's defined if the compiler supports tuples and variadic templates. It compares all members of the tuple from the first one to the last one. */ template <typename ...Args> struct equal_to<std::tuple<Args...>, false> { typedef std::tuple<Args...> value_type; /*! \brief The type of result returned by function object. */ typedef bool result_type; /*! \brief Compare values. If tuple<> Value member is a Geometry geometry::equals() function is used. \param l First value. \param r Second value. \return true if values are equal. */ bool operator()(value_type const& l, value_type const& r) const { return detail::std_tuple_equals< value_type, 0, std::tuple_size<value_type>::value >::apply(l ,r); } }; }}}} // namespace boost::geometry::index::detail #endif // !defined(BOOST_NO_CXX11_HDR_TUPLE) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) namespace boost { namespace geometry { namespace index { /*! \brief The function object comparing Values. The default version handles Values which are Indexables, std::pair<T1, T2>, boost::tuple<...> and std::tuple<...> if STD tuples and variadic templates are supported. All members are compared from left to right, Geometries using boost::geometry::equals() function, other types using operator==. \tparam Value The type of objects which are compared by this function object. */ template <typename Value> struct equal_to : detail::equal_to<Value> { /*! \brief The type of result returned by function object. */ typedef typename detail::equal_to<Value>::result_type result_type; /*! \brief Compare Values. \param l First value. \param r Second value. \return true if Values are equal. */ inline bool operator()(Value const& l, Value const& r) const { return detail::equal_to<Value>::operator()(l ,r); } }; }}} // namespace boost::geometry::index #endif // BOOST_GEOMETRY_INDEX_EQUAL_TO_HPP