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keyed_element.hpp
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/*============================================================================= Copyright (c) 2005-2012 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/fusion/support/config.hpp> #include <boost/fusion/support/detail/access.hpp> #include <boost/fusion/iterator/deref.hpp> #include <boost/fusion/iterator/next.hpp> #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && BOOST_WORKAROUND(BOOST_GCC, / 100 == 404) #include <boost/core/enable_if.hpp> #include <boost/type_traits/is_same.hpp> #endif namespace boost { namespace fusion { struct fusion_sequence_tag; }} namespace boost { namespace fusion { namespace detail { struct nil_keyed_element { typedef fusion_sequence_tag tag; BOOST_FUSION_GPU_ENABLED void get(); template<typename It> BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED 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> BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED static keyed_element from_iterator(It const& it) { return keyed_element( *it, base::from_iterator(fusion::next(it))); } BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element(keyed_element const& rhs) : Rest(rhs.get_base()), value_(rhs.value_) {} #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element(keyed_element&& rhs) : Rest(rhs.forward_base()) , value_(BOOST_FUSION_FWD_ELEM(Value, rhs.value_)) {} #endif template <typename U, typename Rst> BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element(keyed_element<Key, U, Rst> const& rhs , typename enable_if<is_convertible<U, Value> >::type* = 0) : Rest(rhs.get_base()), value_(rhs.value_) {} #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) #endif BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED Rest& get_base() BOOST_NOEXCEPT { return *this; } BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED Rest const& get_base() const BOOST_NOEXCEPT { return *this; } #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED Rest&& forward_base() BOOST_NOEXCEPT { return std::move(*static_cast<Rest*>(this)); } #endif BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED typename cref_result<Value>::type get(Key) const { return value_; } BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED typename ref_result<Value>::type get(Key) { return value_; } BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element( typename detail::call_param<Value>::type value , Rest const& rest) : Rest(rest), value_(value) {} #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) #if BOOST_WORKAROUND(BOOST_GCC, / 100 == 404) template <typename Value_, typename = typename enable_if<is_same<Value_, Value> >::type> #else typedef Value Value_; #endif BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element(Value_&& value, Rest&& rest) : Rest(std::move(rest)) , value_(BOOST_FUSION_FWD_ELEM(Value, value)) {} #endif BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element() : Rest(), value_() {} template<typename U, typename Rst> BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED 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; } BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element& operator=(keyed_element const& rhs) { base::operator=(rhs); value_ = rhs.value_; return *this; } #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED keyed_element& operator=(keyed_element&& rhs) { base::operator=(rhs.forward_base()); value_ = std::move(rhs.value_); return *this; } #endif 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