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 Hu Chunming
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/*!
@file
Defines `boost::hana::Comonad`.
Copyright Louis Dionne 2013-2022
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_COMONAD_HPP
#define BOOST_HANA_CONCEPT_COMONAD_HPP
#include <boost/hana/fwd/concept/comonad.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/duplicate.hpp>
#include <boost/hana/extend.hpp>
#include <boost/hana/extract.hpp>
namespace boost { namespace hana {
template <typename W>
struct Comonad
: hana::integral_constant<bool,
!is_default<extract_impl<typename tag_of<W>::type>>::value &&
(!is_default<duplicate_impl<typename tag_of<W>::type>>::value ||
!is_default<extend_impl<typename tag_of<W>::type>>::value)
>
{ };
}} // end namespace boost::hana
#endif // !BOOST_HANA_CONCEPT_COMONAD_HPP
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