Server : Apache/2.4.41 (Ubuntu) System : Linux absol.cf 5.4.0-198-generic #218-Ubuntu SMP Fri Sep 27 20:18:53 UTC 2024 x86_64 User : www-data ( 33) PHP Version : 7.4.33 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, Directory :  /usr/include/boost/hana/concept/

Upload File : current_dir [ Writeable ] document_root [ Writeable ]

/*!
@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