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/usr/include/boost/beast/core/detail

Name	Size	Mode	Actions
impl/	-	0755	rm
allocator.hpp	945	0644	edit dl rm
async_base.hpp	901	0644	edit dl rm
base64.hpp	1942	0644	edit dl rm
base64.ipp	6170	0644	edit dl rm
bind_continuation.hpp	3504	0644	edit dl rm
bind_default_executor.hpp	3243	0644	edit dl rm
bind_handler.hpp	10959	0644	edit dl rm
buffer.hpp	1825	0644	edit dl rm
buffers_pair.hpp	2636	0644	edit dl rm
buffers_range_adaptor.hpp	2651	0644	edit dl rm
buffers_ref.hpp	1648	0644	edit dl rm
buffer_traits.hpp	2095	0644	edit dl rm
chacha.hpp	4167	0644	edit dl rm
char_buffer.hpp	1407	0644	edit dl rm
clamp.hpp	1229	0644	edit dl rm
config.hpp	2884	0644	edit dl rm
cpu_info.hpp	1787	0644	edit dl rm
flat_stream.hpp	1919	0644	edit dl rm
get_io_context.hpp	2338	0644	edit dl rm
is_invocable.hpp	1888	0644	edit dl rm
ostream.hpp	7004	0644	edit dl rm
pcg.hpp	1464	0644	edit dl rm
read.hpp	9217	0644	edit dl rm
remap_post_to_defer.hpp	2152	0644	edit dl rm
service_base.hpp	850	0644	edit dl rm
sha1.hpp	1624	0644	edit dl rm
sha1.ipp	7998	0644	edit dl rm
static_const.hpp	1154	0644	edit dl rm
static_ostream.hpp	3030	0644	edit dl rm
static_string.hpp	3030	0644	edit dl rm
stream_base.hpp	2685	0644	edit dl rm
stream_traits.hpp	2796	0644	edit dl rm
string.hpp	898	0644	edit dl rm
temporary_buffer.hpp	1611	0644	edit dl rm
tuple.hpp	2194	0644	edit dl rm
type_traits.hpp	2779	0644	edit dl rm
variant.hpp	4889	0644	edit dl rm
varint.hpp	1712	0644	edit dl rm
win32_unicode_path.hpp	2148	0644	edit dl rm
work_guard.hpp	1851	0644	edit dl rm

Edit: /usr/include/boost/beast/core/detail/work_guard.hpp (1851B)

#ifndef BOOST_BEAST_CORE_DETAIL_WORK_GUARD_HPP
#define BOOST_BEAST_CORE_DETAIL_WORK_GUARD_HPP

#include <boost/asio/executor_work_guard.hpp>
#include <boost/asio/execution.hpp>
#include <boost/optional.hpp>

namespace boost {
namespace beast {
namespace detail {

template<class Executor, class Enable = void>
struct select_work_guard;

template<class Executor>
using select_work_guard_t = typename
    select_work_guard<Executor>::type;

#if !defined(BOOST_ASIO_NO_TS_EXECUTORS)
template<class Executor>
struct select_work_guard
<
    Executor,
    typename std::enable_if
    <
        net::is_executor<Executor>::value
    >::type
>
{
    using type = net::executor_work_guard<Executor>;
};
#endif

template<class Executor>
struct execution_work_guard
{
    using executor_type = decltype(
        net::prefer(std::declval<Executor const&>(),
            net::execution::outstanding_work.tracked));

execution_work_guard(Executor const& exec)
    : ex_(net::prefer(exec, net::execution::outstanding_work.tracked))
    {

}

executor_type
    get_executor() const noexcept
    {
        BOOST_ASSERT(ex_.has_value());
        return *ex_;
    }

void reset() noexcept
    {
        ex_.reset();
    }

private:

boost::optional<executor_type> ex_;
};

template<class Executor>
struct select_work_guard
<
    Executor,
    typename std::enable_if
    <
        net::execution::is_executor<Executor>::value
#if defined(BOOST_ASIO_NO_TS_EXECUTORS)
        || net::is_executor<Executor>::value
#else
        && !net::is_executor<Executor>::value
#endif
    >::type
>
{
    using type = execution_work_guard<Executor>;
};

template<class Executor>
select_work_guard_t<Executor>
make_work_guard(Executor const& exec) noexcept
{
    return select_work_guard_t<Executor>(exec);
}

}
}
}

#endif // BOOST_BEAST_CORE_DETAIL_WORK_GUARD_HPP

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