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/*=============================================================================
Copyright (c) 2001-2014 Joel de Guzman
http://spirit.sourceforge.net/
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_X3_IS_VARIANT_JAN_10_2012_0823AM)
#define BOOST_SPIRIT_X3_IS_VARIANT_JAN_10_2012_0823AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/variant.hpp>
#include <boost/mpl/has_xxx.hpp>
#include <boost/mpl/bool.hpp>
namespace boost { namespace spirit { namespace x3 { namespace traits
{
namespace detail
{
// By declaring a nested struct in your class/struct, you tell
// spirit that it is regarded as a variant type. The minimum
// required interface for such a variant is that it has constructors
// for various types supported by your variant and a typedef 'types'
// which is an mpl sequence of the contained types.
//
// This is an intrusive interface. For a non-intrusive interface,
// use the is_variant trait.
BOOST_MPL_HAS_XXX_TRAIT_DEF(adapted_variant_tag)
}
template <typename T, typename Enable = void>
struct is_variant
: detail::has_adapted_variant_tag<T>
{};
template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct is_variant<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>>
: mpl::true_
{};
}}}}
#endif
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