721 lines
20 KiB
C++
Executable File
721 lines
20 KiB
C++
Executable File
///////////////////////////////////////////////////////////////////////////////
|
|
/// \file fusion.hpp
|
|
/// Make any Proto expression a valid Fusion sequence
|
|
//
|
|
// Copyright 2008 Eric Niebler. 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)
|
|
|
|
#ifndef BOOST_PROTO_FUSION_HPP_EAN_11_04_2006
|
|
#define BOOST_PROTO_FUSION_HPP_EAN_11_04_2006
|
|
|
|
#include <boost/config.hpp>
|
|
#include <boost/mpl/if.hpp>
|
|
#include <boost/mpl/bool.hpp>
|
|
#include <boost/mpl/long.hpp>
|
|
#include <boost/mpl/sequence_tag_fwd.hpp>
|
|
#include <boost/utility/enable_if.hpp>
|
|
#include <boost/fusion/include/is_view.hpp>
|
|
#include <boost/fusion/include/tag_of_fwd.hpp>
|
|
#include <boost/fusion/include/category_of.hpp>
|
|
#include <boost/fusion/include/iterator_base.hpp>
|
|
#include <boost/fusion/include/intrinsic.hpp>
|
|
#include <boost/fusion/include/single_view.hpp>
|
|
#include <boost/fusion/include/transform.hpp>
|
|
#include <boost/fusion/include/as_list.hpp>
|
|
#include <boost/fusion/include/is_segmented.hpp>
|
|
#include <boost/fusion/sequence/comparison/enable_comparison.hpp>
|
|
#include <boost/proto/proto_fwd.hpp>
|
|
#include <boost/proto/traits.hpp>
|
|
#include <boost/proto/eval.hpp>
|
|
#include <boost/proto/make_expr.hpp>
|
|
|
|
#ifdef BOOST_MSVC
|
|
#pragma warning(push)
|
|
#pragma warning(disable : 4510) // default constructor could not be generated
|
|
#pragma warning(disable : 4512) // assignment operator could not be generated
|
|
#pragma warning(disable : 4610) // can never be instantiated - user defined constructor required
|
|
#endif
|
|
|
|
namespace boost { namespace proto
|
|
{
|
|
namespace detail
|
|
{
|
|
template<typename Expr, long Pos>
|
|
struct expr_iterator
|
|
: fusion::iterator_base<expr_iterator<Expr, Pos> >
|
|
{
|
|
typedef Expr expr_type;
|
|
static const long index = Pos;
|
|
typedef fusion::random_access_traversal_tag category;
|
|
typedef
|
|
tag::proto_expr_iterator<
|
|
typename Expr::proto_tag
|
|
, typename Expr::proto_domain
|
|
>
|
|
fusion_tag;
|
|
|
|
explicit expr_iterator(Expr &e)
|
|
: expr(e)
|
|
{}
|
|
|
|
Expr &expr;
|
|
};
|
|
|
|
template<typename Tag>
|
|
struct as_element
|
|
{
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
: result<This(Expr const &)>
|
|
{};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr &)>
|
|
: mpl::if_c<
|
|
is_same<Tag, typename Expr::proto_tag>::value
|
|
, flat_view<Expr>
|
|
, fusion::single_view<Expr &>
|
|
>
|
|
{};
|
|
|
|
template<typename Expr>
|
|
typename result<as_element(Expr &)>::type const
|
|
operator ()(Expr &e) const
|
|
{
|
|
return typename result<as_element(Expr &)>::type(e);
|
|
}
|
|
|
|
template<typename Expr>
|
|
typename result<as_element(Expr const &)>::type const
|
|
operator ()(Expr const &e) const
|
|
{
|
|
return typename result<as_element(Expr const &)>::type(e);
|
|
}
|
|
};
|
|
|
|
template<typename Expr>
|
|
struct flat_view
|
|
: fusion::sequence_base<flat_view<Expr> >
|
|
{
|
|
typedef fusion::forward_traversal_tag category;
|
|
typedef
|
|
tag::proto_flat_view<
|
|
typename Expr::proto_tag
|
|
, typename Expr::proto_domain
|
|
>
|
|
fusion_tag;
|
|
typedef
|
|
typename fusion::result_of::as_list<
|
|
typename fusion::result_of::transform<
|
|
Expr
|
|
, as_element<typename Expr::proto_tag>
|
|
>::type
|
|
>::type
|
|
segments_type;
|
|
|
|
explicit flat_view(Expr &e)
|
|
: segs_(fusion::as_list(fusion::transform(e, as_element<typename Expr::proto_tag>())))
|
|
{}
|
|
|
|
segments_type segs_;
|
|
};
|
|
}
|
|
|
|
namespace result_of
|
|
{
|
|
template<typename Expr>
|
|
struct flatten
|
|
: flatten<Expr const &>
|
|
{};
|
|
|
|
template<typename Expr>
|
|
struct flatten<Expr &>
|
|
{
|
|
typedef detail::flat_view<Expr> type;
|
|
};
|
|
}
|
|
|
|
namespace functional
|
|
{
|
|
/// \brief A PolymorphicFunctionObject type that returns a "flattened"
|
|
/// view of a Proto expression tree.
|
|
///
|
|
/// A PolymorphicFunctionObject type that returns a "flattened"
|
|
/// view of a Proto expression tree. For a tree with a top-most node
|
|
/// tag of type \c T, the elements of the flattened sequence are
|
|
/// determined by recursing into each child node with the same
|
|
/// tag type and returning those nodes of different type. So for
|
|
/// instance, the Proto expression tree corresponding to the
|
|
/// expression <tt>a | b | c</tt> has a flattened view with elements
|
|
/// [a, b, c], even though the tree is grouped as
|
|
/// <tt>((a | b) | c)</tt>.
|
|
struct flatten
|
|
{
|
|
BOOST_PROTO_CALLABLE()
|
|
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
: result<This(Expr const &)>
|
|
{};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr &)>
|
|
{
|
|
typedef proto::detail::flat_view<Expr> type;
|
|
};
|
|
|
|
template<typename Expr>
|
|
proto::detail::flat_view<Expr> const
|
|
operator ()(Expr &e) const
|
|
{
|
|
return proto::detail::flat_view<Expr>(e);
|
|
}
|
|
|
|
template<typename Expr>
|
|
proto::detail::flat_view<Expr const> const
|
|
operator ()(Expr const &e) const
|
|
{
|
|
return proto::detail::flat_view<Expr const>(e);
|
|
}
|
|
};
|
|
}
|
|
|
|
/// \brief A function that returns a "flattened"
|
|
/// view of a Proto expression tree.
|
|
///
|
|
/// For a tree with a top-most node
|
|
/// tag of type \c T, the elements of the flattened sequence are
|
|
/// determined by recursing into each child node with the same
|
|
/// tag type and returning those nodes of different type. So for
|
|
/// instance, the Proto expression tree corresponding to the
|
|
/// expression <tt>a | b | c</tt> has a flattened view with elements
|
|
/// [a, b, c], even though the tree is grouped as
|
|
/// <tt>((a | b) | c)</tt>.
|
|
template<typename Expr>
|
|
proto::detail::flat_view<Expr> const
|
|
flatten(Expr &e)
|
|
{
|
|
return proto::detail::flat_view<Expr>(e);
|
|
}
|
|
|
|
/// \overload
|
|
///
|
|
template<typename Expr>
|
|
proto::detail::flat_view<Expr const> const
|
|
flatten(Expr const &e)
|
|
{
|
|
return proto::detail::flat_view<Expr const>(e);
|
|
}
|
|
|
|
/// INTERNAL ONLY
|
|
///
|
|
template<typename Context>
|
|
struct eval_fun
|
|
: proto::callable
|
|
{
|
|
explicit eval_fun(Context &ctx)
|
|
: ctx_(ctx)
|
|
{}
|
|
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
: result<This(Expr const &)>
|
|
{};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr &)>
|
|
: proto::result_of::eval<Expr, Context>
|
|
{};
|
|
|
|
template<typename Expr>
|
|
typename proto::result_of::eval<Expr, Context>::type
|
|
operator ()(Expr &e) const
|
|
{
|
|
return proto::eval(e, this->ctx_);
|
|
}
|
|
|
|
template<typename Expr>
|
|
typename proto::result_of::eval<Expr const, Context>::type
|
|
operator ()(Expr const &e) const
|
|
{
|
|
return proto::eval(e, this->ctx_);
|
|
}
|
|
|
|
private:
|
|
Context &ctx_;
|
|
};
|
|
|
|
/// INTERNAL ONLY
|
|
///
|
|
template<typename Context>
|
|
struct is_callable<eval_fun<Context> >
|
|
: mpl::true_
|
|
{};
|
|
}}
|
|
|
|
namespace boost { namespace fusion
|
|
{
|
|
namespace extension
|
|
{
|
|
template<typename Tag>
|
|
struct is_sequence_impl;
|
|
|
|
template<typename Tag, typename Domain>
|
|
struct is_sequence_impl<proto::tag::proto_flat_view<Tag, Domain> >
|
|
{
|
|
template<typename Sequence>
|
|
struct apply
|
|
: mpl::true_
|
|
{};
|
|
};
|
|
|
|
template<typename Tag, typename Domain>
|
|
struct is_sequence_impl<proto::tag::proto_expr<Tag, Domain> >
|
|
{
|
|
template<typename Sequence>
|
|
struct apply
|
|
: mpl::true_
|
|
{};
|
|
};
|
|
|
|
template<typename Tag>
|
|
struct is_view_impl;
|
|
|
|
template<typename Tag, typename Domain>
|
|
struct is_view_impl<proto::tag::proto_flat_view<Tag, Domain> >
|
|
{
|
|
template<typename Sequence>
|
|
struct apply
|
|
: mpl::true_
|
|
{};
|
|
};
|
|
|
|
template<typename Tag, typename Domain>
|
|
struct is_view_impl<proto::tag::proto_expr<Tag, Domain> >
|
|
{
|
|
template<typename Sequence>
|
|
struct apply
|
|
: mpl::false_
|
|
{};
|
|
};
|
|
|
|
template<typename Tag>
|
|
struct value_of_impl;
|
|
|
|
template<typename Tag, typename Domain>
|
|
struct value_of_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
|
|
>::value_type
|
|
type;
|
|
};
|
|
|
|
template<typename Iterator>
|
|
struct apply<Iterator, 0>
|
|
{
|
|
typedef
|
|
typename proto::result_of::value<
|
|
typename Iterator::expr_type
|
|
>::value_type
|
|
type;
|
|
};
|
|
};
|
|
|
|
template<typename Tag>
|
|
struct deref_impl;
|
|
|
|
template<typename Tag, typename Domain>
|
|
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);
|
|
}
|
|
};
|
|
};
|
|
|
|
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
|