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721 lines
20 KiB
721 lines
20 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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/// \file fusion.hpp
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/// Make any Proto expression a valid Fusion sequence
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROTO_FUSION_HPP_EAN_11_04_2006
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#define BOOST_PROTO_FUSION_HPP_EAN_11_04_2006
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#include <boost/config.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/long.hpp>
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#include <boost/mpl/sequence_tag_fwd.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/fusion/include/is_view.hpp>
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#include <boost/fusion/include/tag_of_fwd.hpp>
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#include <boost/fusion/include/category_of.hpp>
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#include <boost/fusion/include/iterator_base.hpp>
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#include <boost/fusion/include/intrinsic.hpp>
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#include <boost/fusion/include/single_view.hpp>
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#include <boost/fusion/include/transform.hpp>
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#include <boost/fusion/include/as_list.hpp>
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#include <boost/fusion/include/is_segmented.hpp>
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#include <boost/fusion/sequence/comparison/enable_comparison.hpp>
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#include <boost/proto/proto_fwd.hpp>
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#include <boost/proto/traits.hpp>
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#include <boost/proto/eval.hpp>
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#include <boost/proto/make_expr.hpp>
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#ifdef BOOST_MSVC
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#pragma warning(push)
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#pragma warning(disable : 4510) // default constructor could not be generated
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#pragma warning(disable : 4512) // assignment operator could not be generated
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#pragma warning(disable : 4610) // can never be instantiated - user defined constructor required
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#endif
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namespace boost { namespace proto
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{
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namespace detail
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{
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template<typename Expr, long Pos>
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struct expr_iterator
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: fusion::iterator_base<expr_iterator<Expr, Pos> >
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{
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typedef Expr expr_type;
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static const long index = Pos;
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typedef fusion::random_access_traversal_tag category;
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typedef
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tag::proto_expr_iterator<
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typename Expr::proto_tag
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, typename Expr::proto_domain
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>
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fusion_tag;
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explicit expr_iterator(Expr &e)
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: expr(e)
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{}
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Expr &expr;
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};
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template<typename Tag>
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struct as_element
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{
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template<typename Sig>
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struct result;
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template<typename This, typename Expr>
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struct result<This(Expr)>
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: result<This(Expr const &)>
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{};
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template<typename This, typename Expr>
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struct result<This(Expr &)>
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: mpl::if_c<
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is_same<Tag, typename Expr::proto_tag>::value
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, flat_view<Expr>
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, fusion::single_view<Expr &>
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>
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{};
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template<typename Expr>
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typename result<as_element(Expr &)>::type const
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operator ()(Expr &e) const
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{
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return typename result<as_element(Expr &)>::type(e);
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}
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template<typename Expr>
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typename result<as_element(Expr const &)>::type const
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operator ()(Expr const &e) const
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{
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return typename result<as_element(Expr const &)>::type(e);
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}
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};
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template<typename Expr>
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struct flat_view
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: fusion::sequence_base<flat_view<Expr> >
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{
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typedef fusion::forward_traversal_tag category;
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typedef
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tag::proto_flat_view<
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typename Expr::proto_tag
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, typename Expr::proto_domain
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>
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fusion_tag;
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typedef
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typename fusion::result_of::as_list<
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typename fusion::result_of::transform<
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Expr
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, as_element<typename Expr::proto_tag>
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>::type
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>::type
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segments_type;
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explicit flat_view(Expr &e)
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: segs_(fusion::as_list(fusion::transform(e, as_element<typename Expr::proto_tag>())))
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{}
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segments_type segs_;
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};
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}
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namespace result_of
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{
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template<typename Expr>
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struct flatten
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: flatten<Expr const &>
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{};
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template<typename Expr>
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struct flatten<Expr &>
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{
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typedef detail::flat_view<Expr> type;
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};
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}
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namespace functional
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{
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/// \brief A PolymorphicFunctionObject type that returns a "flattened"
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/// view of a Proto expression tree.
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///
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/// A PolymorphicFunctionObject type that returns a "flattened"
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/// view of a Proto expression tree. For a tree with a top-most node
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/// tag of type \c T, the elements of the flattened sequence are
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/// determined by recursing into each child node with the same
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/// tag type and returning those nodes of different type. So for
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/// instance, the Proto expression tree corresponding to the
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/// expression <tt>a | b | c</tt> has a flattened view with elements
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/// [a, b, c], even though the tree is grouped as
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/// <tt>((a | b) | c)</tt>.
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struct flatten
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{
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BOOST_PROTO_CALLABLE()
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template<typename Sig>
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struct result;
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template<typename This, typename Expr>
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struct result<This(Expr)>
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: result<This(Expr const &)>
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{};
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template<typename This, typename Expr>
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struct result<This(Expr &)>
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{
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typedef proto::detail::flat_view<Expr> type;
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};
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template<typename Expr>
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proto::detail::flat_view<Expr> const
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operator ()(Expr &e) const
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{
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return proto::detail::flat_view<Expr>(e);
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}
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template<typename Expr>
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proto::detail::flat_view<Expr const> const
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operator ()(Expr const &e) const
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{
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return proto::detail::flat_view<Expr const>(e);
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}
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};
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}
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/// \brief A function that returns a "flattened"
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/// view of a Proto expression tree.
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///
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/// For a tree with a top-most node
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/// tag of type \c T, the elements of the flattened sequence are
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/// determined by recursing into each child node with the same
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/// tag type and returning those nodes of different type. So for
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/// instance, the Proto expression tree corresponding to the
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/// expression <tt>a | b | c</tt> has a flattened view with elements
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/// [a, b, c], even though the tree is grouped as
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/// <tt>((a | b) | c)</tt>.
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template<typename Expr>
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proto::detail::flat_view<Expr> const
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flatten(Expr &e)
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{
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return proto::detail::flat_view<Expr>(e);
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}
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/// \overload
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///
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template<typename Expr>
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proto::detail::flat_view<Expr const> const
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flatten(Expr const &e)
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{
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return proto::detail::flat_view<Expr const>(e);
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}
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/// INTERNAL ONLY
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///
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template<typename Context>
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struct eval_fun
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: proto::callable
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{
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explicit eval_fun(Context &ctx)
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: ctx_(ctx)
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{}
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template<typename Sig>
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struct result;
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template<typename This, typename Expr>
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struct result<This(Expr)>
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: result<This(Expr const &)>
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{};
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template<typename This, typename Expr>
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struct result<This(Expr &)>
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: proto::result_of::eval<Expr, Context>
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{};
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template<typename Expr>
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typename proto::result_of::eval<Expr, Context>::type
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operator ()(Expr &e) const
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{
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return proto::eval(e, this->ctx_);
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}
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template<typename Expr>
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typename proto::result_of::eval<Expr const, Context>::type
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operator ()(Expr const &e) const
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{
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return proto::eval(e, this->ctx_);
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}
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private:
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Context &ctx_;
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};
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/// INTERNAL ONLY
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///
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template<typename Context>
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struct is_callable<eval_fun<Context> >
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: mpl::true_
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{};
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}}
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namespace boost { namespace fusion
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{
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namespace extension
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{
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template<typename Tag>
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struct is_sequence_impl;
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template<typename Tag, typename Domain>
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struct is_sequence_impl<proto::tag::proto_flat_view<Tag, Domain> >
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{
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template<typename Sequence>
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struct apply
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: mpl::true_
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{};
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};
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template<typename Tag, typename Domain>
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struct is_sequence_impl<proto::tag::proto_expr<Tag, Domain> >
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{
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template<typename Sequence>
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struct apply
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: mpl::true_
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{};
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};
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template<typename Tag>
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struct is_view_impl;
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template<typename Tag, typename Domain>
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struct is_view_impl<proto::tag::proto_flat_view<Tag, Domain> >
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{
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template<typename Sequence>
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struct apply
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: mpl::true_
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{};
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};
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template<typename Tag, typename Domain>
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struct is_view_impl<proto::tag::proto_expr<Tag, Domain> >
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{
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template<typename Sequence>
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struct apply
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: mpl::false_
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{};
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};
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template<typename Tag>
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struct value_of_impl;
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template<typename Tag, typename Domain>
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struct value_of_impl<proto::tag::proto_expr_iterator<Tag, Domain> >
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{
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template<
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typename Iterator
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, long Arity = proto::arity_of<typename Iterator::expr_type>::value
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|
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>
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|
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struct apply
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|
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{
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|
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typedef
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|
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typename proto::result_of::child_c<
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|
|
typename Iterator::expr_type
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|
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, Iterator::index
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|
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>::value_type
|
||
|
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type;
|
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|
|
};
|
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|
|
|
||
|
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template<typename Iterator>
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|
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struct apply<Iterator, 0>
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|
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{
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|
|
typedef
|
||
|
|
typename proto::result_of::value<
|
||
|
|
typename Iterator::expr_type
|
||
|
|
>::value_type
|
||
|
|
type;
|
||
|
|
};
|
||
|
|
};
|
||
|
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|
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|
|
template<typename Tag>
|
||
|
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struct deref_impl;
|
||
|
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|
||
|
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template<typename Tag, typename Domain>
|
||
|
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struct deref_impl<proto::tag::proto_expr_iterator<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<
|
||
|
|
typename Iterator
|
||
|
|
, long Arity = proto::arity_of<typename Iterator::expr_type>::value
|
||
|
|
>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::child_c<
|
||
|
|
typename Iterator::expr_type &
|
||
|
|
, Iterator::index
|
||
|
|
>::type
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Iterator const &iter)
|
||
|
|
{
|
||
|
|
return proto::child_c<Iterator::index>(iter.expr);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Iterator>
|
||
|
|
struct apply<Iterator, 0>
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::value<
|
||
|
|
typename Iterator::expr_type &
|
||
|
|
>::type
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Iterator const &iter)
|
||
|
|
{
|
||
|
|
return proto::value(iter.expr);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct advance_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct advance_impl<proto::tag::proto_expr_iterator<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Iterator, typename N>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
proto::detail::expr_iterator<
|
||
|
|
typename Iterator::expr_type
|
||
|
|
, Iterator::index + N::value
|
||
|
|
>
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Iterator const &iter)
|
||
|
|
{
|
||
|
|
return type(iter.expr);
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||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct distance_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct distance_impl<proto::tag::proto_expr_iterator<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename IteratorFrom, typename IteratorTo>
|
||
|
|
struct apply
|
||
|
|
: mpl::long_<IteratorTo::index - IteratorFrom::index>
|
||
|
|
{};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct next_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct next_impl<proto::tag::proto_expr_iterator<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Iterator>
|
||
|
|
struct apply
|
||
|
|
: advance_impl<proto::tag::proto_expr_iterator<Tag, Domain> >::template apply<Iterator, mpl::long_<1> >
|
||
|
|
{};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct prior_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct prior_impl<proto::tag::proto_expr_iterator<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Iterator>
|
||
|
|
struct apply
|
||
|
|
: advance_impl<proto::tag::proto_expr_iterator<Tag, Domain> >::template apply<Iterator, mpl::long_<-1> >
|
||
|
|
{};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct category_of_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct category_of_impl<proto::tag::proto_expr<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef random_access_traversal_tag type;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct size_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct size_impl<proto::tag::proto_expr<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
: mpl::long_<0 == Sequence::proto_arity_c ? 1 : Sequence::proto_arity_c>
|
||
|
|
{};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct begin_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct begin_impl<proto::tag::proto_expr<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef proto::detail::expr_iterator<Sequence, 0> type;
|
||
|
|
|
||
|
|
static type call(Sequence &seq)
|
||
|
|
{
|
||
|
|
return type(seq);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct end_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct end_impl<proto::tag::proto_expr<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
proto::detail::expr_iterator<
|
||
|
|
Sequence
|
||
|
|
, 0 == Sequence::proto_arity_c ? 1 : Sequence::proto_arity_c
|
||
|
|
>
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Sequence &seq)
|
||
|
|
{
|
||
|
|
return type(seq);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct value_at_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct value_at_impl<proto::tag::proto_expr<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<
|
||
|
|
typename Sequence
|
||
|
|
, typename Index
|
||
|
|
, long Arity = proto::arity_of<Sequence>::value
|
||
|
|
>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::child_c<
|
||
|
|
Sequence
|
||
|
|
, Index::value
|
||
|
|
>::value_type
|
||
|
|
type;
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Sequence, typename Index>
|
||
|
|
struct apply<Sequence, Index, 0>
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::value<
|
||
|
|
Sequence
|
||
|
|
>::value_type
|
||
|
|
type;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct at_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct at_impl<proto::tag::proto_expr<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<
|
||
|
|
typename Sequence
|
||
|
|
, typename Index
|
||
|
|
, long Arity = proto::arity_of<Sequence>::value
|
||
|
|
>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::child_c<
|
||
|
|
Sequence &
|
||
|
|
, Index::value
|
||
|
|
>::type
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Sequence &seq)
|
||
|
|
{
|
||
|
|
return proto::child_c<Index::value>(seq);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Sequence, typename Index>
|
||
|
|
struct apply<Sequence, Index, 0>
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::value<
|
||
|
|
Sequence &
|
||
|
|
>::type
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Sequence &seq)
|
||
|
|
{
|
||
|
|
return proto::value(seq);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct convert_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct convert_impl<proto::tag::proto_expr<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::unpack_expr<
|
||
|
|
Tag
|
||
|
|
, Domain
|
||
|
|
, Sequence
|
||
|
|
>::type
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Sequence& seq)
|
||
|
|
{
|
||
|
|
return proto::unpack_expr<Tag, Domain>(seq);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct convert_impl<proto::tag::proto_flat_view<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef
|
||
|
|
typename proto::result_of::unpack_expr<
|
||
|
|
Tag
|
||
|
|
, Domain
|
||
|
|
, Sequence
|
||
|
|
>::type
|
||
|
|
type;
|
||
|
|
|
||
|
|
static type call(Sequence& seq)
|
||
|
|
{
|
||
|
|
return proto::unpack_expr<Tag, Domain>(seq);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct is_segmented_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct is_segmented_impl<proto::tag::proto_flat_view<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Iterator>
|
||
|
|
struct apply
|
||
|
|
: mpl::true_
|
||
|
|
{};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag>
|
||
|
|
struct segments_impl;
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct segments_impl<proto::tag::proto_flat_view<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef typename Sequence::segments_type const &type;
|
||
|
|
|
||
|
|
static type call(Sequence &sequence)
|
||
|
|
{
|
||
|
|
return sequence.segs_;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag, typename Domain>
|
||
|
|
struct category_of_impl<proto::tag::proto_flat_view<Tag, Domain> >
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef forward_traversal_tag type;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace traits
|
||
|
|
{
|
||
|
|
template<typename Seq1, typename Seq2>
|
||
|
|
struct enable_equality<
|
||
|
|
Seq1
|
||
|
|
, Seq2
|
||
|
|
, typename enable_if_c<
|
||
|
|
mpl::or_<
|
||
|
|
proto::is_expr<Seq1>
|
||
|
|
, proto::is_expr<Seq2>
|
||
|
|
>::value
|
||
|
|
>::type
|
||
|
|
>
|
||
|
|
: mpl::false_
|
||
|
|
{};
|
||
|
|
|
||
|
|
template<typename Seq1, typename Seq2>
|
||
|
|
struct enable_comparison<
|
||
|
|
Seq1
|
||
|
|
, Seq2
|
||
|
|
, typename enable_if_c<
|
||
|
|
mpl::or_<
|
||
|
|
proto::is_expr<Seq1>
|
||
|
|
, proto::is_expr<Seq2>
|
||
|
|
>::value
|
||
|
|
>::type
|
||
|
|
>
|
||
|
|
: mpl::false_
|
||
|
|
{};
|
||
|
|
}
|
||
|
|
}}
|
||
|
|
|
||
|
|
namespace boost { namespace mpl
|
||
|
|
{
|
||
|
|
template<typename Tag, typename Args, long Arity>
|
||
|
|
struct sequence_tag< proto::expr<Tag, Args, Arity> >
|
||
|
|
{
|
||
|
|
typedef fusion::fusion_sequence_tag type;
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Tag, typename Args, long Arity>
|
||
|
|
struct sequence_tag< proto::basic_expr<Tag, Args, Arity> >
|
||
|
|
{
|
||
|
|
typedef fusion::fusion_sequence_tag type;
|
||
|
|
};
|
||
|
|
}}
|
||
|
|
|
||
|
|
#ifdef BOOST_MSVC
|
||
|
|
#pragma warning(pop)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|