222 lines
6.1 KiB
C++
222 lines
6.1 KiB
C++
// Boost.Geometry Index
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//
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// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
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//
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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_INDEX_EQUAL_TO_HPP
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#define BOOST_GEOMETRY_INDEX_EQUAL_TO_HPP
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#include <boost/geometry/algorithms/equals.hpp>
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namespace boost { namespace geometry { namespace index {
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namespace detail {
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template <typename Geometry, typename Tag>
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struct equals
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{
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static bool apply(Geometry const& g1, Geometry const& g2)
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{
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return geometry::equals(g1, g2);
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}
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};
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template <typename T>
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struct equals<T, void>
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{
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static bool apply(T const& v1, T const& v2)
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{
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return v1 == v2;
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}
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};
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template <typename Tuple, size_t I, size_t N>
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struct tuple_equals
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{
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inline static bool apply(Tuple const& t1, Tuple const& t2)
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{
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typedef typename boost::tuples::element<I, Tuple>::type T;
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return
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equals<
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T, typename geometry::traits::tag<T>::type
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>::apply(boost::get<I>(t1), boost::get<I>(t2))
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&&
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tuple_equals<Tuple, I+1, N>::apply(t1, t2);
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}
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};
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template <typename Tuple, size_t I>
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struct tuple_equals<Tuple, I, I>
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{
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inline static bool apply(Tuple const&, Tuple const&)
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{
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return true;
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}
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};
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} // namespace detail
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/*!
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\brief The function object comparing Values.
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It compares Geometries using geometry::equals() function. Other types are compared using operator==.
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The default version handles Values which are Indexables.
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This template is also specialized for std::pair<T1, T2> and boost::tuple<...>.
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\tparam Value The type of objects which are compared by this function object.
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*/
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template <typename Value>
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struct equal_to
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{
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/*! \brief The type of result returned by function object. */
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typedef bool result_type;
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/*!
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\brief Compare values. If Value is a Geometry geometry::equals() function is used.
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\param l First value.
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\param r Second value.
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\return true if values are equal.
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*/
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bool operator()(Value const& l, Value const& r) const
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{
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return detail::equals<Value, typename geometry::traits::tag<Value>::type>::apply(l ,r);
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}
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};
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/*!
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\brief The function object comparing Values.
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This specialization compares values of type std::pair<T1, T2>.
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It compares pairs' first values, then second values.
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\tparam T1 The first type.
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\tparam T2 The second type.
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*/
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template <typename T1, typename T2>
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struct equal_to< std::pair<T1, T2> >
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{
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/*! \brief The type of result returned by function object. */
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typedef bool result_type;
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/*!
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\brief Compare values. If pair<> Value member is a Geometry geometry::equals() function is used.
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\param l First value.
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\param r Second value.
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\return true if values are equal.
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*/
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bool operator()(std::pair<T1, T2> const& l, std::pair<T1, T2> const& r) const
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{
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typedef detail::equals<T1, typename geometry::traits::tag<T1>::type> equals1;
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typedef detail::equals<T2, typename geometry::traits::tag<T2>::type> equals2;
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return equals1::apply(l.first, r.first) && equals2::apply(l.second, r.second);
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}
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};
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/*!
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\brief The function object comparing Values.
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This specialization compares values of type boost::tuple<...>.
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It compares all members of the tuple from the first one to the last one.
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*/
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template <typename T0, typename T1, typename T2, typename T3, typename T4,
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typename T5, typename T6, typename T7, typename T8, typename T9>
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struct equal_to< boost::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> >
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{
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typedef boost::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> value_type;
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/*! \brief The type of result returned by function object. */
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typedef bool result_type;
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/*!
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\brief Compare values. If tuple<> Value member is a Geometry geometry::equals() function is used.
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\param l First value.
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\param r Second value.
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\return true if values are equal.
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*/
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bool operator()(value_type const& l, value_type const& r) const
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{
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return detail::tuple_equals<
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value_type, 0, boost::tuples::length<value_type>::value
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>::apply(l ,r);
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}
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};
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}}} // namespace boost::geometry::index
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#if !defined(BOOST_NO_CXX11_HDR_TUPLE) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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#include <tuple>
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namespace boost { namespace geometry { namespace index {
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namespace detail {
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template <typename Tuple, size_t I, size_t N>
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struct std_tuple_equals
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{
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inline static bool apply(Tuple const& t1, Tuple const& t2)
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{
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typedef typename std::tuple_element<I, Tuple>::type T;
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return
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equals<
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T, typename geometry::traits::tag<T>::type
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>::apply(std::get<I>(t1), std::get<I>(t2))
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&&
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std_tuple_equals<Tuple, I+1, N>::apply(t1, t2);
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}
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};
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template <typename Tuple, size_t I>
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struct std_tuple_equals<Tuple, I, I>
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{
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inline static bool apply(Tuple const&, Tuple const&)
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{
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return true;
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}
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};
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} // namespace detail
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/*!
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\brief The function object comparing Values.
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This specialization compares values of type std::tuple<Args...>.
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It's defined if the compiler supports tuples and variadic templates.
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It compares all members of the tuple from the first one to the last one.
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*/
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template <typename ...Args>
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struct equal_to< std::tuple<Args...> >
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{
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typedef std::tuple<Args...> value_type;
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/*! \brief The type of result returned by function object. */
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typedef bool result_type;
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/*!
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\brief Compare values. If tuple<> Value member is a Geometry geometry::equals() function is used.
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\param l First value.
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\param r Second value.
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\return true if values are equal.
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*/
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bool operator()(value_type const& l, value_type const& r) const
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{
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return detail::std_tuple_equals<
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value_type, 0, std::tuple_size<value_type>::value
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>::apply(l ,r);
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}
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};
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}}} // namespace boost::geometry::index
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#endif // !defined(BOOST_NO_CXX11_HDR_TUPLE) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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#endif // BOOST_GEOMETRY_INDEX_EQUAL_TO_HPP
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