boost/spirit/home/x3/support/traits/attribute_category.hpp
/*=============================================================================
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_ATTRIBUTE_CATEGORY_JAN_4_2012_1150AM)
#define BOOST_SPIRIT_X3_ATTRIBUTE_CATEGORY_JAN_4_2012_1150AM
#include <boost/mpl/identity.hpp>
#include <boost/mpl/logical.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/fusion/include/copy.hpp>
#include <boost/fusion/include/is_sequence.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/spirit/home/x3/support/traits/is_variant.hpp>
#include <boost/spirit/home/x3/support/traits/container_traits.hpp>
namespace boost { namespace spirit { namespace x3
{
struct unused_type;
}}}
namespace boost { namespace spirit { namespace x3 { namespace traits
{
struct unused_attribute {};
struct plain_attribute {};
struct container_attribute {};
struct tuple_attribute {};
struct associative_attribute {};
struct variant_attribute {};
struct optional_attribute {};
template <typename T, typename Enable = void>
struct attribute_category
: mpl::identity<plain_attribute> {};
template <>
struct attribute_category<unused_type>
: mpl::identity<unused_attribute> {};
template <>
struct attribute_category<unused_type const>
: mpl::identity<unused_attribute> {};
template <typename T>
struct attribute_category< T
, typename enable_if<
typename mpl::eval_if<
fusion::traits::is_sequence<T>
, fusion::traits::is_associative<T>
, mpl::false_
>::type >::type >
: mpl::identity<associative_attribute> {};
template <typename T>
struct attribute_category< T
, typename enable_if<
mpl::and_<
fusion::traits::is_sequence<T>
, mpl::not_<fusion::traits::is_associative<T> >
> >::type >
: mpl::identity<tuple_attribute> {};
template <typename T>
struct attribute_category<T,
typename enable_if<traits::is_variant<T>>::type>
: mpl::identity<variant_attribute> {};
template <typename T>
struct attribute_category<T,
typename enable_if<traits::is_container<T>>::type>
: mpl::identity<container_attribute> {};
}}}}
#endif
