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//-----------------------------------------------------------------------------
// boost variant/detail/enable_recursive.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2003
// Eric Friedman
//
// 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_VARIANT_DETAIL_ENABLE_RECURSIVE_HPP
#define BOOST_VARIANT_DETAIL_ENABLE_RECURSIVE_HPP
#include "boost/variant/detail/enable_recursive_fwd.hpp"
#include "boost/variant/variant_fwd.hpp"
#if !defined(BOOST_VARIANT_NO_FULL_RECURSIVE_VARIANT_SUPPORT)
# include "boost/mpl/apply.hpp"
# include "boost/mpl/eval_if.hpp"
# include "boost/mpl/lambda.hpp"
#endif
#include "boost/variant/detail/substitute.hpp"
#include "boost/mpl/aux_/config/ctps.hpp"
#include "boost/mpl/bool_fwd.hpp"
#include "boost/mpl/if.hpp"
#include "boost/mpl/or.hpp"
#include "boost/type_traits/is_pointer.hpp"
#include "boost/type_traits/is_reference.hpp"
#include "boost/type_traits/is_same.hpp"
#include "boost/variant/recursive_wrapper.hpp"
namespace boost {
namespace detail { namespace variant {
#if !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
# define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL(T,Dest,Source) \
substitute< T , Dest , Source > \
/**/
#else // defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
///////////////////////////////////////////////////////////////////////////////
// (detail) class template rebind1
//
// Limited workaround in case 'substitute' metafunction unavailable.
//
template <typename T, typename U1>
struct rebind1
{
private:
typedef typename mpl::lambda<
mpl::identity<T>
>::type le_;
public:
typedef typename mpl::eval_if<
is_same< le_, mpl::identity<T> >
, le_ // identity<T>
, mpl::apply1<le_, U1>
>::type type;
};
# define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL(T,Dest,Source) \
rebind1< T , Dest > \
/**/
#endif // !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
///////////////////////////////////////////////////////////////////////////////
// (detail) metafunction enable_recursive
//
// See boost/variant/detail/enable_recursive_fwd.hpp for more information.
//
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template <typename T, typename RecursiveVariant, typename NoWrapper>
struct enable_recursive
: BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL(
T, RecursiveVariant, ::boost::recursive_variant_
)
{
};
template <typename T, typename RecursiveVariant>
struct enable_recursive< T,RecursiveVariant,mpl::false_ >
{
private: // helpers, for metafunction result (below)
typedef typename BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL(
T, RecursiveVariant, ::boost::recursive_variant_
)::type t_;
public: // metafunction result
// [Wrap with recursive_wrapper only if rebind really changed something:]
typedef typename mpl::if_<
mpl::or_<
is_same< t_,T >
, is_reference<t_>
, is_pointer<t_>
>
, t_
, boost::recursive_wrapper<t_>
>::type type;
};
#else // defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template <typename T, typename RecursiveVariant, typename NoWrapper>
struct enable_recursive
{
private: // helpers, for metafunction result (below)
typedef typename BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL(
T, RecursiveVariant, ::boost::recursive_variant_
)::type t_;
public: // metafunction result
// [Wrap with recursive_wrapper only if rebind really changed something:]
typedef typename mpl::if_<
mpl::or_<
NoWrapper
, is_same< t_,T >
, is_reference<t_>
, is_pointer<t_>
>
, t_
, boost::recursive_wrapper<t_>
>::type type;
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION workaround
///////////////////////////////////////////////////////////////////////////////
// (detail) metafunction class quoted_enable_recursive
//
// Same behavior as enable_recursive metafunction (see above).
//
template <typename RecursiveVariant, typename NoWrapper>
struct quoted_enable_recursive
{
template <typename T>
struct apply
: enable_recursive<T, RecursiveVariant, NoWrapper>
{
};
};
}} // namespace detail::variant
} // namespace boost
#endif // BOOST_VARIANT_DETAIL_ENABLE_RECURSIVE_HPP
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