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View File Name : foldable.hpp

/*!
@file
Defines `boost::hana::Foldable`.

@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
 */

#ifndef BOOST_HANA_CONCEPT_FOLDABLE_HPP
#define BOOST_HANA_CONCEPT_FOLDABLE_HPP

#include <boost/hana/fwd/concept/foldable.hpp>

#include <boost/hana/config.hpp>
#include <boost/hana/core/default.hpp>
#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/detail/integral_constant.hpp>
#include <boost/hana/fold_left.hpp>
#include <boost/hana/unpack.hpp>


BOOST_HANA_NAMESPACE_BEGIN
    template <typename T>
    struct Foldable
        : hana::integral_constant<bool,
            !is_default<fold_left_impl<typename tag_of<T>::type>>::value ||
            !is_default<unpack_impl<typename tag_of<T>::type>>::value
        >
    { };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_CONCEPT_FOLDABLE_HPP