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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(FUSION_CATEGORY_OF_07202005_0308)
#define FUSION_CATEGORY_OF_07202005_0308
#include <boost/fusion/support/detail/category_of.hpp>
#include <boost/fusion/support/tag_of.hpp>
#include <boost/type_traits/is_base_of.hpp>
namespace boost { namespace fusion
{
// Special tags:
struct boost_tuple_tag; // boost::tuples::tuple tag
struct boost_array_tag; // boost::array tag
struct mpl_sequence_tag; // mpl sequence tag
struct std_pair_tag; // std::pair tag
struct incrementable_traversal_tag {};
struct single_pass_traversal_tag
: incrementable_traversal_tag {};
struct forward_traversal_tag
: single_pass_traversal_tag {};
struct bidirectional_traversal_tag
: forward_traversal_tag {};
struct random_access_traversal_tag
: bidirectional_traversal_tag {};
struct associative_tag {};
namespace extension
{
template<typename Tag>
struct category_of_impl
{
template<typename T>
struct apply : detail::fusion_category_of<T> {};
};
template <>
struct category_of_impl<boost_tuple_tag>;
template <>
struct category_of_impl<boost_array_tag>;
template <>
struct category_of_impl<mpl_sequence_tag>;
template <>
struct category_of_impl<std_pair_tag>;
}
namespace traits
{
template <typename T>
struct category_of
: extension::category_of_impl<typename fusion::detail::tag_of<T>::type>::
template apply<T>
{};
template <typename T>
struct is_associative
: is_base_of<
associative_tag
, typename category_of<T>::type>
{};
template <typename T>
struct is_incrementable
: is_base_of<
incrementable_traversal_tag
, typename category_of<T>::type>
{};
template <typename T>
struct is_single_pass
: is_base_of<
single_pass_traversal_tag
, typename category_of<T>::type>
{};
template <typename T>
struct is_forward
: is_base_of<
forward_traversal_tag
, typename category_of<T>::type>
{};
template <typename T>
struct is_bidirectional
: is_base_of<
bidirectional_traversal_tag
, typename category_of<T>::type>
{};
template <typename T>
struct is_random_access
: is_base_of<
random_access_traversal_tag
, typename category_of<T>::type>
{};
}
}}
#endif
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