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111 lines
2.9 KiB
111 lines
2.9 KiB
/*============================================================================= |
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Copyright (c) 2005-2011 Joel de Guzman |
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Copyright (c) 2005-2006 Dan Marsden |
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Distributed under the Boost Software License, Version 1.0. (See accompanying |
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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==============================================================================*/ |
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#if !defined(BOOST_FUSION_DEQUE_DETAIL_KEYED_ELEMENT_26112006_1330) |
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#define BOOST_FUSION_DEQUE_DETAIL_KEYED_ELEMENT_26112006_1330 |
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#include <boost/type_traits/add_reference.hpp> |
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#include <boost/type_traits/add_const.hpp> |
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#include <boost/fusion/iterator/deref.hpp> |
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#include <boost/fusion/iterator/next.hpp> |
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namespace boost { namespace fusion { |
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struct fusion_sequence_tag; |
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namespace detail { |
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struct nil_keyed_element |
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{ |
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typedef fusion_sequence_tag tag; |
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void get(); |
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template<typename It> |
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static nil_keyed_element |
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from_iterator(It const&) |
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{ |
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return nil_keyed_element(); |
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} |
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}; |
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template<typename Key, typename Value, typename Rest> |
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struct keyed_element |
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: Rest |
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{ |
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typedef Rest base; |
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typedef fusion_sequence_tag tag; |
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using Rest::get; |
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template<typename It> |
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static keyed_element |
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from_iterator(It const& it) |
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{ |
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return keyed_element( |
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*it, base::from_iterator(fusion::next(it))); |
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} |
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template<typename U, typename Rst> |
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keyed_element(keyed_element<Key, U, Rst> const& rhs) |
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: Rest(rhs.get_base()), value_(rhs.value_) |
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{} |
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Rest const get_base() const |
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{ |
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return *this; |
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} |
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typename add_reference<typename add_const<Value>::type>::type get(Key) const |
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{ |
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return value_; |
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} |
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typename add_reference<Value>::type get(Key) |
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{ |
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return value_; |
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} |
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keyed_element(typename add_reference<typename add_const<Value>::type>::type value, Rest const& rest) |
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: Rest(rest), value_(value) |
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{} |
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keyed_element() |
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: Rest(), value_() |
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{} |
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template<typename U, typename Rst> |
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keyed_element& operator=(keyed_element<Key, U, Rst> const& rhs) |
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{ |
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base::operator=(static_cast<Rst const&>(rhs)); // cast for msvc-7.1 |
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value_ = rhs.value_; |
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return *this; |
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} |
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keyed_element& operator=(keyed_element const& rhs) |
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{ |
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base::operator=(rhs); |
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value_ = rhs.value_; |
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return *this; |
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} |
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Value value_; |
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}; |
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template<typename Elem, typename Key> |
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struct keyed_element_value_at |
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: keyed_element_value_at<typename Elem::base, Key> |
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{}; |
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template<typename Key, typename Value, typename Rest> |
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struct keyed_element_value_at<keyed_element<Key, Value, Rest>, Key> |
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{ |
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typedef Value type; |
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}; |
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}}} |
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#endif
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