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 :  /proc/thread-self/root/usr/include/boost/hana/

Upload File : current_dir [ Writeable ] document_root [ Writeable ]

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

@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_FOR_EACH_HPP
#define BOOST_HANA_FOR_EACH_HPP

#include <boost/hana/fwd/for_each.hpp>

#include <boost/hana/concept/foldable.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/unpack.hpp>


BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename Xs, typename F>
    constexpr void for_each_t::operator()(Xs&& xs, F&& f) const {
        using S = typename hana::tag_of<Xs>::type;
        using ForEach = BOOST_HANA_DISPATCH_IF(for_each_impl<S>,
            hana::Foldable<S>::value
        );

    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Foldable<S>::value,
        "hana::for_each(xs, f) requires 'xs' to be Foldable");
    #endif

        return ForEach::apply(static_cast<Xs&&>(xs), static_cast<F&&>(f));
    }
    //! @endcond

    namespace detail {
        template <typename F>
        struct on_each {
            F f;
            template <typename ...Xs>
            constexpr void operator()(Xs&& ...xs) const {
                using Swallow = int[];
                (void)Swallow{0, ((void)(*f)(static_cast<Xs&&>(xs)), 0)...};
            }
        };
    }

    template <typename T, bool condition>
    struct for_each_impl<T, when<condition>> : default_ {
        template <typename Xs, typename F>
        static constexpr void apply(Xs&& xs, F&& f) {
            // We use a pointer instead of a reference to avoid a Clang ICE.
            hana::unpack(static_cast<Xs&&>(xs),
                         detail::on_each<decltype(&f)>{&f});
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_FOR_EACH_HPP