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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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)
==============================================================================*/
#if !defined(BOOST_SPIRIT_EXTENDED_VARIANT_AUGUST_6_2011_0859AM)
#define BOOST_SPIRIT_EXTENDED_VARIANT_AUGUST_6_2011_0859AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/variant.hpp>
#include <boost/mpl/limits/list.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
#if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
#define BOOST_SPIRIT_EXTENDED_VARIANT_LIMIT_TYPES BOOST_MPL_LIMIT_LIST_SIZE
#else
#define BOOST_SPIRIT_EXTENDED_VARIANT_LIMIT_TYPES BOOST_VARIANT_LIMIT_TYPES
#endif
#define BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(T) \
BOOST_PP_ENUM_PARAMS(BOOST_SPIRIT_EXTENDED_VARIANT_LIMIT_TYPES, T) \
/**/
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit
{
template <
BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(
BOOST_VARIANT_LIMIT_TYPES,
typename T, boost::detail::variant::void_)
// We should not be depending on detail::variant::void_
// but I'm not sure if this can fixed. Any other way is
// clumsy at best.
>
struct extended_variant
{
// tell spirit that this is an adapted variant
struct adapted_variant_tag;
typedef boost::variant<
BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(T)>
variant_type;
typedef typename variant_type::types types;
typedef extended_variant<
BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(T)
> base_type;
extended_variant() : var() {}
template <typename T>
extended_variant(T const& var)
: var(var) {}
template <typename T>
extended_variant(T& var)
: var(var) {}
template <typename F>
typename F::result_type apply_visitor(F const& v)
{
return var.apply_visitor(v);
}
template <typename F>
typename F::result_type apply_visitor(F const& v) const
{
return var.apply_visitor(v);
}
template <typename F>
typename F::result_type apply_visitor(F& v)
{
return var.apply_visitor(v);
}
template <typename F>
typename F::result_type apply_visitor(F& v) const
{
return var.apply_visitor(v);
}
variant_type const& get() const
{
return var;
}
variant_type& get()
{
return var;
}
variant_type var;
};
}}
namespace boost
{
template <typename T, BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(typename T)>
inline T const&
get(boost::spirit::extended_variant<
BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(T)> const& x)
{
return boost::get<T>(x.get());
}
template <typename T, BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(typename T)>
inline T&
get(boost::spirit::extended_variant<
BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(T)>& x)
{
return boost::get<T>(x.get());
}
template <typename T, BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(typename T)>
inline T const*
get(boost::spirit::extended_variant<
BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(T)> const* x)
{
return boost::get<T>(&x->get());
}
template <typename T, BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(typename T)>
inline T*
get(boost::spirit::extended_variant<
BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS(T)>* x)
{
return boost::get<T>(&x->get());
}
}
#undef BOOST_SPIRIT_EXTENDED_VARIANT_ENUM_PARAMS
#undef BOOST_SPIRIT_EXTENDED_VARIANT_LIMIT_TYPES
#endif
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