| /*============================================================================= |
| 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 |
