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///////////////////////////////////////////////////////////////////////////////
// cons.hpp
//
// 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_XPRESSIVE_DETAIL_UTILITY_CONS_HPP_EAN_11_19_2005
#define BOOST_XPRESSIVE_DETAIL_UTILITY_CONS_HPP_EAN_11_19_2005
#include <boost/version.hpp>
#if BOOST_VERSION >= 103300
// In Boost 1.33+, we have a cons list in Fusion, so just include it.
# if BOOST_VERSION >= 103500
# include <boost/fusion/include/cons.hpp> // Boost 1.35+ has Fusion2
# else
# include <boost/spirit/fusion/sequence/cons.hpp> // Fusion1
# endif
#else
// For earlier versions of Boost, put the definition of cons here
# include <boost/call_traits.hpp>
# include <boost/mpl/if.hpp>
# include <boost/mpl/eval_if.hpp>
# include <boost/mpl/identity.hpp>
# include <boost/type_traits/is_const.hpp>
# include <boost/type_traits/add_const.hpp>
# include <boost/type_traits/add_reference.hpp>
# include <boost/spirit/fusion/detail/config.hpp>
# include <boost/spirit/fusion/detail/access.hpp>
# include <boost/spirit/fusion/iterator/next.hpp>
# include <boost/spirit/fusion/iterator/equal_to.hpp>
# include <boost/spirit/fusion/iterator/as_fusion_iterator.hpp>
# include <boost/spirit/fusion/iterator/detail/iterator_base.hpp>
# include <boost/spirit/fusion/sequence/begin.hpp>
# include <boost/spirit/fusion/sequence/end.hpp>
# include <boost/spirit/fusion/sequence/as_fusion_sequence.hpp>
# include <boost/spirit/fusion/sequence/detail/sequence_base.hpp>
namespace boost { namespace fusion
{
struct nil;
struct cons_tag;
template <typename Car, typename Cdr>
struct cons;
struct cons_iterator_tag;
template <typename Cons>
struct cons_iterator;
namespace cons_detail
{
template <typename Iterator>
struct deref_traits_impl
{
typedef typename Iterator::cons_type cons_type;
typedef typename cons_type::car_type value_type;
typedef typename mpl::eval_if<
is_const<cons_type>
, add_reference<typename add_const<value_type>::type>
, add_reference<value_type> >::type
type;
static type
call(Iterator const& i)
{
return detail::ref(i.cons.car);
}
};
template <typename Iterator>
struct next_traits_impl
{
typedef typename Iterator::cons_type cons_type;
typedef typename cons_type::cdr_type cdr_type;
typedef cons_iterator<
typename mpl::eval_if<
is_const<cons_type>
, add_const<cdr_type>
, mpl::identity<cdr_type>
>::type>
type;
static type
call(Iterator const& i)
{
return type(detail::ref(i.cons.cdr));
}
};
template <typename Iterator>
struct value_traits_impl
{
typedef typename Iterator::cons_type cons_type;
typedef typename cons_type::car_type type;
};
template <typename Cons>
struct begin_traits_impl
{
typedef cons_iterator<Cons> type;
static type
call(Cons& t)
{
return type(t);
}
};
template <typename Cons>
struct end_traits_impl
{
typedef cons_iterator<
typename mpl::if_<is_const<Cons>, nil const, nil>::type>
type;
static type
call(Cons& t)
{
FUSION_RETURN_DEFAULT_CONSTRUCTED;
}
};
} // namespace cons_detail
namespace meta
{
template <typename Tag>
struct deref_impl;
template <>
struct deref_impl<cons_iterator_tag>
{
template <typename Iterator>
struct apply : cons_detail::deref_traits_impl<Iterator> {};
};
template <typename Tag>
struct next_impl;
template <>
struct next_impl<cons_iterator_tag>
{
template <typename Iterator>
struct apply : cons_detail::next_traits_impl<Iterator> {};
};
template <typename Tag>
struct value_impl;
template <>
struct value_impl<cons_iterator_tag>
{
template <typename Iterator>
struct apply : cons_detail::value_traits_impl<Iterator> {};
};
template <typename Tag>
struct begin_impl;
template <>
struct begin_impl<cons_tag>
{
template <typename Sequence>
struct apply : cons_detail::begin_traits_impl<Sequence>
{};
};
template <typename Tag>
struct end_impl;
template <>
struct end_impl<cons_tag>
{
template <typename Sequence>
struct apply : cons_detail::end_traits_impl<Sequence>
{};
};
} // namespace meta
template <typename Cons = nil>
struct cons_iterator : iterator_base<cons_iterator<Cons> >
{
typedef cons_iterator_tag tag;
typedef Cons cons_type;
explicit cons_iterator(cons_type& cons_)
: cons(cons_) {}
cons_type& cons;
};
template <>
struct cons_iterator<nil> : iterator_base<cons_iterator<nil> >
{
typedef cons_iterator_tag tag;
typedef nil cons_type;
cons_iterator() {}
explicit cons_iterator(nil const&) {}
};
template <>
struct cons_iterator<nil const> : iterator_base<cons_iterator<nil const> >
{
typedef cons_iterator_tag tag;
typedef nil const cons_type;
cons_iterator() {}
explicit cons_iterator(nil const&) {}
};
struct nil : sequence_base<nil>
{
typedef cons_tag tag;
typedef void_t car_type;
typedef void_t cdr_type;
};
template <typename Car, typename Cdr = nil>
struct cons : sequence_base<cons<Car,Cdr> >
{
typedef cons_tag tag;
typedef typename call_traits<Car>::value_type car_type;
typedef Cdr cdr_type;
cons()
: car(), cdr() {}
explicit cons(
typename call_traits<Car>::param_type car_
, typename call_traits<Cdr>::param_type cdr_ = Cdr())
: car(car_), cdr(cdr_) {}
car_type car;
cdr_type cdr;
};
template <typename Car>
inline cons<Car>
make_cons(Car const& car)
{
return cons<Car>(car);
}
template <typename Car, typename Cdr>
inline cons<Car, Cdr>
make_cons(Car const& car, Cdr const& cdr)
{
return cons<Car, Cdr>(car, cdr);
}
}} // namespace boost::fusion
namespace boost { namespace mpl
{
template <typename Tag>
struct begin_impl;
template <typename Tag>
struct end_impl;
template <>
struct begin_impl<fusion::cons_tag>
: fusion::meta::begin_impl<fusion::cons_tag>
{
};
template <>
struct end_impl<fusion::cons_tag>
: fusion::meta::end_impl<fusion::cons_tag>
{
};
}} // namespace boost::mpl
#endif
// Before Boost v1.33.1, Fusion cons lists were not valid MPL sequences.
#if BOOST_VERSION < 103301
namespace boost { namespace mpl
{
template<typename Iterator>
struct next;
template<typename Cons>
struct next<fusion::cons_iterator<Cons> >
: fusion::cons_detail::next_traits_impl<fusion::cons_iterator<Cons> >
{
};
template<typename Iterator>
struct deref;
template<typename Cons>
struct deref<fusion::cons_iterator<Cons> >
: fusion::cons_detail::value_traits_impl<fusion::cons_iterator<Cons> >
{
};
}} // namespace boost::mpl
#endif
#endif
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