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// Boost.Geometry Index
//
// Copyright (c) 2011-2013 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_DETAIL_TUPLES_HPP
#define BOOST_GEOMETRY_INDEX_DETAIL_TUPLES_HPP
#include <boost/tuple/tuple.hpp>
#include <boost/type_traits/is_same.hpp>
// TODO move this to index/tuples and separate algorithms
namespace boost { namespace geometry { namespace index { namespace detail {
namespace tuples {
// find_index
namespace detail {
template <typename Tuple, typename El, size_t N>
struct find_index;
template <typename Tuple, typename El, size_t N, typename CurrentEl>
struct find_index_impl
{
static const size_t value = find_index<Tuple, El, N - 1>::value;
};
template <typename Tuple, typename El, size_t N>
struct find_index_impl<Tuple, El, N, El>
{
static const size_t value = N - 1;
};
template <typename Tuple, typename El, typename CurrentEl>
struct find_index_impl<Tuple, El, 1, CurrentEl>
{
BOOST_MPL_ASSERT_MSG(
(false),
ELEMENT_NOT_FOUND,
(find_index_impl));
};
template <typename Tuple, typename El>
struct find_index_impl<Tuple, El, 1, El>
{
static const size_t value = 0;
};
template <typename Tuple, typename El, size_t N>
struct find_index
{
static const size_t value =
find_index_impl<
Tuple,
El,
N,
typename boost::tuples::element<N - 1, Tuple>::type
>::value;
};
} // namespace detail
template <typename Tuple, typename El>
struct find_index
{
static const size_t value =
detail::find_index<
Tuple,
El,
boost::tuples::length<Tuple>::value
>::value;
};
// has
namespace detail {
template <typename Tuple, typename El, size_t N>
struct has
{
static const bool value
= boost::is_same<
typename boost::tuples::element<N - 1, Tuple>::type,
El
>::value
|| has<Tuple, El, N - 1>::value;
};
template <typename Tuple, typename El>
struct has<Tuple, El, 1>
{
static const bool value
= boost::is_same<
typename boost::tuples::element<0, Tuple>::type,
El
>::value;
};
} // namespace detail
template <typename Tuple, typename El>
struct has
{
static const bool value
= detail::has<
Tuple,
El,
boost::tuples::length<Tuple>::value
>::value;
};
// add
template <typename Tuple, typename El>
struct add
{
BOOST_MPL_ASSERT_MSG(
(false),
NOT_IMPLEMENTED_FOR_THIS_TUPLE_TYPE,
(add));
};
template <typename T1, typename T>
struct add<boost::tuple<T1>, T>
{
typedef boost::tuple<T1, T> type;
};
template <typename T1, typename T2, typename T>
struct add<boost::tuple<T1, T2>, T>
{
typedef boost::tuple<T1, T2, T> type;
};
// add_if
template <typename Tuple, typename El, bool Cond>
struct add_if
{
typedef Tuple type;
};
template <typename Tuple, typename El>
struct add_if<Tuple, El, true>
{
typedef typename add<Tuple, El>::type type;
};
// add_unique
template <typename Tuple, typename El>
struct add_unique
{
typedef typename add_if<
Tuple,
El,
!has<Tuple, El>::value
>::type type;
};
template <typename Tuple, typename T, size_t I, size_t N>
struct push_back_impl
{
typedef
boost::tuples::cons<
typename boost::tuples::element<I, Tuple>::type,
typename push_back_impl<Tuple, T, I+1, N>::type
> type;
static type apply(Tuple const& tup, T const& t)
{
return
type(
boost::get<I>(tup),
push_back_impl<Tuple, T, I+1, N>::apply(tup, t)
);
}
};
template <typename Tuple, typename T, size_t N>
struct push_back_impl<Tuple, T, N, N>
{
typedef boost::tuples::cons<T, boost::tuples::null_type> type;
static type apply(Tuple const&, T const& t)
{
return type(t, boost::tuples::null_type());
}
};
} // namespace tuples
}}}} // namespace boost::geometry::index::detail
#endif // BOOST_GEOMETRY_INDEX_DETAIL_RTREE_TAGS_HPP
|
