forked from boostorg/fusion
Overhaul the fusion::fold family to make SFINAE-friendly.
This commit is contained in:
Kohei Takahashi
@ -2,6 +2,7 @@
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2006 Dan Marsden
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Copyright (c) 2009-2010 Christopher Schmidt
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Copyright (c) 2015 Kohei Takahashi
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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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@ -45,374 +46,121 @@ namespace boost { namespace fusion
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{
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namespace detail
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{
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template<typename State, typename It, typename F>
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struct BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)
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: fusion::detail::result_of_with_decltype<
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F(
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typename add_reference<typename add_const<State>::type>::type,
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BOOST_FUSION_FOLD_IMPL_INVOKE_IT_META_TRANSFORM(It))
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>
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template<int SeqSize, typename It, typename State, typename F, typename = void>
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struct BOOST_PP_CAT(result_of_it_,BOOST_FUSION_FOLD_NAME)
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{};
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template<typename Result,int N>
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struct BOOST_PP_CAT(unrolled_,BOOST_FUSION_FOLD_NAME)
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template<typename It, typename State, typename F>
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struct BOOST_PP_CAT(result_of_it_,BOOST_FUSION_FOLD_NAME)<0,It,State,F
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, typename boost::enable_if_has_type<typename State::type>::type>
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{
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template<typename State3, typename It3, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call_3(State3 const& state3,It3 const& it3,F& f)
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{
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return BOOST_PP_CAT(unrolled_,BOOST_FUSION_FOLD_NAME)<
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Result
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, N-4
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>::call(
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f(state3,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it3)),
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fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it3),
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f);
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}
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template<typename State2, typename It2, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call_2(State2 const& state2,It2 const& it2,F& f)
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{
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return call_3(
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f(state2,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it2)),
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fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it2),
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f);
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}
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template<typename State1, typename It1, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call_1(State1 const& state1,It1 const& it1,F& f)
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{
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return call_2(
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f(state1,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it1)),
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fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it1),
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f);
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}
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template<typename State, typename It0, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call(State const& state,It0 const& it0,F f)
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{
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return call_1(
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f(state,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it0)),
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fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it0),
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f);
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}
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typedef typename State::type type;
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};
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template<typename Result>
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struct BOOST_PP_CAT(unrolled_,BOOST_FUSION_FOLD_NAME)<Result,3>
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{
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template<typename State2, typename It2, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call_2(State2 const& state2,It2 const& it2,F& f)
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{
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return f(state2,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it2));
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}
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template<typename State1, typename It1, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call_1(State1 const& state1,It1 const& it1,F& f)
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{
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return call_2(
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f(state1,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it1)),
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fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it1),
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f);
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}
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template<typename State, typename It0, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call(State const& state,It0 const& it0,F f)
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{
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return call_1(
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f(state,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it0)),
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fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it0),
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f);
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}
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};
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template<typename Result>
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struct BOOST_PP_CAT(unrolled_,BOOST_FUSION_FOLD_NAME)<Result,2>
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{
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template<typename State1, typename It1, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call_1(State1 const& state1,It1 const& it1,F& f)
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{
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return f(state1,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it1));
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}
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template<typename State, typename It0, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call(State const& state,It0 const& it0,F f)
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{
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return call_1(
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f(state,BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it0)),
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fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it0),
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f);
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}
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};
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template<typename Result>
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struct BOOST_PP_CAT(unrolled_,BOOST_FUSION_FOLD_NAME)<Result,1>
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{
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template<typename State, typename It0, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call(State const& state,It0 const& it0,F f)
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{
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return f(state,
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BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it0));
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}
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};
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template<typename Result>
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struct BOOST_PP_CAT(unrolled_,BOOST_FUSION_FOLD_NAME)<Result,0>
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{
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template<typename State, typename It0, typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static Result
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call(State const& state,It0 const&, F)
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{
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return static_cast<Result>(state);
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}
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};
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template<typename StateRef, typename It0, typename F, int N>
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struct BOOST_PP_CAT(result_of_unrolled_,BOOST_FUSION_FOLD_NAME)
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{
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typedef typename
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BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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StateRef
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, It0 const
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, F
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>::type
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rest1;
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typedef typename
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result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<
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It0 const
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>::type
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it1;
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typedef typename
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BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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rest1
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, it1
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, F
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>::type
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rest2;
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typedef typename
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result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<it1>::type
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it2;
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typedef typename
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BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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rest2
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, it2
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, F
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>::type
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rest3;
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typedef typename
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result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<it2>::type
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it3;
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typedef typename
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BOOST_PP_CAT(result_of_unrolled_,BOOST_FUSION_FOLD_NAME)<
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typename BOOST_PP_CAT(
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BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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rest3
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, it3
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, F
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>::type
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, typename result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<
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it3
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>::type
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, F
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, N-4
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>::type
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type;
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};
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template<typename StateRef, typename It0, typename F>
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struct BOOST_PP_CAT(result_of_unrolled_,BOOST_FUSION_FOLD_NAME)<
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StateRef
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, It0
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, F
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, 3
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>
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{
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typedef typename
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BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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StateRef
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, It0 const
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, F
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>::type
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rest1;
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typedef typename
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result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<
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It0 const
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>::type
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it1;
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typedef typename
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BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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typename BOOST_PP_CAT(
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BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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rest1
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, it1
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, F
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>::type
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, typename result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<
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it1 const
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>::type const
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, F
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>::type
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type;
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};
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template<typename StateRef, typename It0, typename F>
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struct BOOST_PP_CAT(result_of_unrolled_,BOOST_FUSION_FOLD_NAME)<
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StateRef
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, It0
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, F
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, 2
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>
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: BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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typename BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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StateRef
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, It0 const
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, F
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>::type
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, typename result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<
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It0 const
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>::type const
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, F
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>
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{};
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template<typename StateRef, typename It0, typename F>
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struct BOOST_PP_CAT(result_of_unrolled_,BOOST_FUSION_FOLD_NAME)<
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StateRef
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, It0
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, F
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, 1
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>
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: BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME, _lvalue_state)<
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StateRef
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, It0 const
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, F
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>
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{};
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template<typename StateRef, typename It0, typename F>
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struct BOOST_PP_CAT(result_of_unrolled_,BOOST_FUSION_FOLD_NAME)<
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StateRef
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, It0
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, F
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, 0
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>
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{
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typedef StateRef type;
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};
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template<typename StateRef, typename It0, typename F, int SeqSize>
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struct BOOST_PP_CAT(result_of_first_unrolled,BOOST_FUSION_FOLD_NAME)
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{
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typedef typename
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BOOST_PP_CAT(result_of_unrolled_,BOOST_FUSION_FOLD_NAME)<
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typename fusion::detail::result_of_with_decltype<
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F(
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StateRef,
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BOOST_FUSION_FOLD_IMPL_INVOKE_IT_META_TRANSFORM(
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It0 const)
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)
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>::type
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, typename result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<
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It0 const
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>::type
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, F
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, SeqSize-1
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>::type
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type;
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};
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template<int SeqSize, typename StateRef, typename Seq, typename F>
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struct BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME,_impl)
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{
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typedef typename
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BOOST_PP_CAT(
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result_of_first_unrolled,BOOST_FUSION_FOLD_NAME)<
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StateRef
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, BOOST_FUSION_FOLD_IMPL_FIRST_IT_META_TRANSFORM(
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typename result_of::BOOST_FUSION_FOLD_IMPL_FIRST_IT_FUNCTION<Seq>::type
|
||||
template<int SeqSize, typename It, typename State, typename F>
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struct BOOST_PP_CAT(result_of_it_,BOOST_FUSION_FOLD_NAME)<SeqSize,It,State,F
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, typename boost::enable_if_has_type<typename State::type>::type>
|
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: BOOST_PP_CAT(result_of_it_,BOOST_FUSION_FOLD_NAME)<
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SeqSize-1
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, typename result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<It>::type
|
||||
, boost::result_of<
|
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F(
|
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typename State::type const&,
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BOOST_FUSION_FOLD_IMPL_INVOKE_IT_META_TRANSFORM(It const)
|
||||
)
|
||||
, F
|
||||
, SeqSize
|
||||
>::type
|
||||
type;
|
||||
|
||||
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||||
static type
|
||||
call(StateRef state, Seq& seq, F f)
|
||||
{
|
||||
typedef
|
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BOOST_PP_CAT(unrolled_,BOOST_FUSION_FOLD_NAME)<
|
||||
type
|
||||
, SeqSize
|
||||
>
|
||||
unrolled_impl;
|
||||
|
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return unrolled_impl::call(
|
||||
state,
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BOOST_FUSION_FOLD_IMPL_FIRST_IT_TRANSFORM(
|
||||
fusion::BOOST_FUSION_FOLD_IMPL_FIRST_IT_FUNCTION(seq)),
|
||||
f);
|
||||
}
|
||||
};
|
||||
|
||||
template<typename StateRef, typename Seq, typename F>
|
||||
struct BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME,_impl)<0,StateRef,Seq,F>
|
||||
{
|
||||
typedef StateRef type;
|
||||
|
||||
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||||
static StateRef
|
||||
call(StateRef state, Seq&, F)
|
||||
{
|
||||
return static_cast<StateRef>(state);
|
||||
}
|
||||
};
|
||||
|
||||
template<typename Seq, typename State, typename F, bool IsSegmented>
|
||||
struct BOOST_PP_CAT(result_of_, BOOST_FUSION_FOLD_NAME)
|
||||
: BOOST_PP_CAT(BOOST_FUSION_FOLD_NAME,_impl)<
|
||||
result_of::size<Seq>::value
|
||||
, typename add_reference<
|
||||
typename add_const<State>::type
|
||||
>::type
|
||||
, Seq
|
||||
>
|
||||
, F
|
||||
>
|
||||
{};
|
||||
|
||||
template<typename It, typename State, typename F>
|
||||
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||||
inline typename BOOST_PP_CAT(result_of_it_,BOOST_FUSION_FOLD_NAME)<
|
||||
0
|
||||
, It
|
||||
, State
|
||||
, F
|
||||
>::type
|
||||
BOOST_PP_CAT(it_,BOOST_FUSION_FOLD_NAME)(mpl::int_<0>, It const&, typename State::type state, F&)
|
||||
{
|
||||
return state;
|
||||
}
|
||||
|
||||
template<typename It, typename State, typename F, int SeqSize>
|
||||
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||||
inline typename lazy_enable_if_c<
|
||||
SeqSize != 0
|
||||
, BOOST_PP_CAT(result_of_it_,BOOST_FUSION_FOLD_NAME)<
|
||||
SeqSize
|
||||
, It
|
||||
, State
|
||||
, F
|
||||
>
|
||||
>::type
|
||||
BOOST_PP_CAT(it_,BOOST_FUSION_FOLD_NAME)(mpl::int_<SeqSize>, It const& it, typename State::type state, F& f)
|
||||
{
|
||||
return BOOST_PP_CAT(it_,BOOST_FUSION_FOLD_NAME)<
|
||||
typename result_of::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION<It>::type
|
||||
, boost::result_of<
|
||||
F(
|
||||
typename State::type const&,
|
||||
BOOST_FUSION_FOLD_IMPL_INVOKE_IT_META_TRANSFORM(It const)
|
||||
)
|
||||
>
|
||||
, F
|
||||
>(
|
||||
mpl::int_<SeqSize-1>()
|
||||
, fusion::BOOST_FUSION_FOLD_IMPL_NEXT_IT_FUNCTION(it)
|
||||
, f(state, BOOST_FUSION_FOLD_IMPL_INVOKE_IT_TRANSFORM(it))
|
||||
, f
|
||||
);
|
||||
}
|
||||
|
||||
template<typename Seq, typename State, typename F
|
||||
, bool = traits::is_sequence<Seq>::value
|
||||
, bool = traits::is_segmented<Seq>::value>
|
||||
struct BOOST_PP_CAT(result_of_,BOOST_FUSION_FOLD_NAME)
|
||||
{};
|
||||
|
||||
template<typename Seq, typename State, typename F>
|
||||
struct BOOST_PP_CAT(result_of_,BOOST_FUSION_FOLD_NAME)<Seq, State, F, true, false>
|
||||
: BOOST_PP_CAT(result_of_it_,BOOST_FUSION_FOLD_NAME)<
|
||||
result_of::size<Seq>::value
|
||||
, BOOST_FUSION_FOLD_IMPL_FIRST_IT_META_TRANSFORM(
|
||||
typename result_of::BOOST_FUSION_FOLD_IMPL_FIRST_IT_FUNCTION<Seq>::type
|
||||
)
|
||||
, add_reference<typename add_const<State>::type>
|
||||
, F
|
||||
>
|
||||
{};
|
||||
|
||||
template<typename Seq, typename State, typename F>
|
||||
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||||
inline typename BOOST_PP_CAT(result_of_,BOOST_FUSION_FOLD_NAME)<Seq, State, F>::type
|
||||
BOOST_FUSION_FOLD_NAME(Seq& seq, State& state, F& f)
|
||||
{
|
||||
return BOOST_PP_CAT(it_,BOOST_FUSION_FOLD_NAME)<
|
||||
BOOST_FUSION_FOLD_IMPL_FIRST_IT_META_TRANSFORM(
|
||||
typename result_of::BOOST_FUSION_FOLD_IMPL_FIRST_IT_FUNCTION<Seq>::type
|
||||
)
|
||||
, add_reference<typename add_const<State>::type>
|
||||
, F
|
||||
>(
|
||||
typename result_of::size<Seq>::type()
|
||||
, BOOST_FUSION_FOLD_IMPL_FIRST_IT_TRANSFORM(
|
||||
fusion::BOOST_FUSION_FOLD_IMPL_FIRST_IT_FUNCTION(seq)
|
||||
)
|
||||
, state
|
||||
, f
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
namespace result_of
|
||||
{
|
||||
template<typename Seq, typename State, typename F>
|
||||
struct BOOST_FUSION_FOLD_NAME
|
||||
: detail::BOOST_PP_CAT(result_of_, BOOST_FUSION_FOLD_NAME)<
|
||||
Seq
|
||||
, State
|
||||
, F
|
||||
, traits::is_segmented<Seq>::type::value
|
||||
>
|
||||
: detail::BOOST_PP_CAT(result_of_,BOOST_FUSION_FOLD_NAME)<Seq, State, F>
|
||||
{};
|
||||
}
|
||||
|
||||
@ -425,10 +173,7 @@ namespace boost { namespace fusion
|
||||
>::type
|
||||
BOOST_FUSION_FOLD_NAME(Seq& seq, State const& state, F f)
|
||||
{
|
||||
return result_of::BOOST_FUSION_FOLD_NAME<Seq,State const,F>::call(
|
||||
state,
|
||||
seq,
|
||||
f);
|
||||
return detail::BOOST_FUSION_FOLD_NAME<Seq, State const, F>(seq, state, f);
|
||||
}
|
||||
|
||||
template<typename Seq, typename State, typename F>
|
||||
@ -440,10 +185,7 @@ namespace boost { namespace fusion
|
||||
>::type
|
||||
BOOST_FUSION_FOLD_NAME(Seq const& seq, State const& state, F f)
|
||||
{
|
||||
return result_of::BOOST_FUSION_FOLD_NAME<Seq const,State const,F>::call(
|
||||
state,
|
||||
seq,
|
||||
f);
|
||||
return detail::BOOST_FUSION_FOLD_NAME<Seq const, State const, F>(seq, state, f);
|
||||
}
|
||||
|
||||
template<typename Seq, typename State, typename F>
|
||||
@ -455,10 +197,7 @@ namespace boost { namespace fusion
|
||||
>::type
|
||||
BOOST_FUSION_FOLD_NAME(Seq& seq, State& state, F f)
|
||||
{
|
||||
return result_of::BOOST_FUSION_FOLD_NAME<Seq,State,F>::call(
|
||||
state,
|
||||
seq,
|
||||
f);
|
||||
return detail::BOOST_FUSION_FOLD_NAME<Seq, State, F>(seq, state, f);
|
||||
}
|
||||
|
||||
template<typename Seq, typename State, typename F>
|
||||
@ -470,10 +209,7 @@ namespace boost { namespace fusion
|
||||
>::type
|
||||
BOOST_FUSION_FOLD_NAME(Seq const& seq, State& state, F f)
|
||||
{
|
||||
return result_of::BOOST_FUSION_FOLD_NAME<Seq const,State,F>::call(
|
||||
state,
|
||||
seq,
|
||||
f);
|
||||
return detail::BOOST_FUSION_FOLD_NAME<Seq const, State, F>(seq, state, f);
|
||||
}
|
||||
}}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user