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/*=============================================================================
Copyright (c) 2005-2011 Joel de Guzman
Copyright (c) 2005-2006 Dan Marsden
Distributed under 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)
==============================================================================*/
#if !defined(BOOST_FUSION_DEQUE_DETAIL_KEYED_ELEMENT_26112006_1330)
#define BOOST_FUSION_DEQUE_DETAIL_KEYED_ELEMENT_26112006_1330
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/fusion/iterator/deref.hpp>
#include <boost/fusion/iterator/next.hpp>
namespace boost { namespace fusion {
struct fusion_sequence_tag;
namespace detail {
struct nil_keyed_element
{
typedef fusion_sequence_tag tag;
void get();
template<typename It>
static nil_keyed_element
from_iterator(It const&)
{
return nil_keyed_element();
}
};
template<typename Key, typename Value, typename Rest>
struct keyed_element
: Rest
{
typedef Rest base;
typedef fusion_sequence_tag tag;
using Rest::get;
template<typename It>
static keyed_element
from_iterator(It const& it)
{
return keyed_element(
*it, base::from_iterator(fusion::next(it)));
}
template<typename U, typename Rst>
keyed_element(keyed_element<Key, U, Rst> const& rhs)
: Rest(rhs.get_base()), value_(rhs.value_)
{}
Rest const get_base() const
{
return *this;
}
typename add_reference<typename add_const<Value>::type>::type get(Key) const
{
return value_;
}
typename add_reference<Value>::type get(Key)
{
return value_;
}
keyed_element(typename add_reference<typename add_const<Value>::type>::type value, Rest const& rest)
: Rest(rest), value_(value)
{}
keyed_element()
: Rest(), value_()
{}
template<typename U, typename Rst>
keyed_element& operator=(keyed_element<Key, U, Rst> const& rhs)
{
base::operator=(static_cast<Rst const&>(rhs)); // cast for msvc-7.1
value_ = rhs.value_;
return *this;
}
keyed_element& operator=(keyed_element const& rhs)
{
base::operator=(rhs);
value_ = rhs.value_;
return *this;
}
Value value_;
};
template<typename Elem, typename Key>
struct keyed_element_value_at
: keyed_element_value_at<typename Elem::base, Key>
{};
template<typename Key, typename Value, typename Rest>
struct keyed_element_value_at<keyed_element<Key, Value, Rest>, Key>
{
typedef Value type;
};
}}}
#endif
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