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+//
+// detail/base_from_cancellation_state.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP
+#define ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/associated_cancellation_slot.hpp"
+#include "asio/cancellation_state.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Handler, typename = void>
+class base_from_cancellation_state
+{
+public:
+ typedef cancellation_slot cancellation_slot_type;
+
+ cancellation_slot_type get_cancellation_slot() const ASIO_NOEXCEPT
+ {
+ return cancellation_state_.slot();
+ }
+
+ cancellation_state get_cancellation_state() const ASIO_NOEXCEPT
+ {
+ return cancellation_state_;
+ }
+
+protected:
+ explicit base_from_cancellation_state(const Handler& handler)
+ : cancellation_state_(
+ asio::get_associated_cancellation_slot(handler))
+ {
+ }
+
+ template <typename Filter>
+ base_from_cancellation_state(const Handler& handler, Filter filter)
+ : cancellation_state_(
+ asio::get_associated_cancellation_slot(handler), filter, filter)
+ {
+ }
+
+ template <typename InFilter, typename OutFilter>
+ base_from_cancellation_state(const Handler& handler,
+ ASIO_MOVE_ARG(InFilter) in_filter,
+ ASIO_MOVE_ARG(OutFilter) out_filter)
+ : cancellation_state_(
+ asio::get_associated_cancellation_slot(handler),
+ ASIO_MOVE_CAST(InFilter)(in_filter),
+ ASIO_MOVE_CAST(OutFilter)(out_filter))
+ {
+ }
+
+ void reset_cancellation_state(const Handler& handler)
+ {
+ cancellation_state_ = cancellation_state(
+ asio::get_associated_cancellation_slot(handler));
+ }
+
+ template <typename Filter>
+ void reset_cancellation_state(const Handler& handler, Filter filter)
+ {
+ cancellation_state_ = cancellation_state(
+ asio::get_associated_cancellation_slot(handler), filter, filter);
+ }
+
+ template <typename InFilter, typename OutFilter>
+ void reset_cancellation_state(const Handler& handler,
+ ASIO_MOVE_ARG(InFilter) in_filter,
+ ASIO_MOVE_ARG(OutFilter) out_filter)
+ {
+ cancellation_state_ = cancellation_state(
+ asio::get_associated_cancellation_slot(handler),
+ ASIO_MOVE_CAST(InFilter)(in_filter),
+ ASIO_MOVE_CAST(OutFilter)(out_filter));
+ }
+
+ cancellation_type_t cancelled() const ASIO_NOEXCEPT
+ {
+ return cancellation_state_.cancelled();
+ }
+
+private:
+ cancellation_state cancellation_state_;
+};
+
+template <typename Handler>
+class base_from_cancellation_state<Handler,
+ typename enable_if<
+ is_same<
+ typename associated_cancellation_slot<
+ Handler, cancellation_slot
+ >::asio_associated_cancellation_slot_is_unspecialised,
+ void
+ >::value
+ >::type>
+{
+public:
+ cancellation_state get_cancellation_state() const ASIO_NOEXCEPT
+ {
+ return cancellation_state();
+ }
+
+protected:
+ explicit base_from_cancellation_state(const Handler&)
+ {
+ }
+
+ template <typename Filter>
+ base_from_cancellation_state(const Handler&, Filter)
+ {
+ }
+
+ template <typename InFilter, typename OutFilter>
+ base_from_cancellation_state(const Handler&,
+ ASIO_MOVE_ARG(InFilter),
+ ASIO_MOVE_ARG(OutFilter))
+ {
+ }
+
+ void reset_cancellation_state(const Handler&)
+ {
+ }
+
+ template <typename Filter>
+ void reset_cancellation_state(const Handler&, Filter)
+ {
+ }
+
+ template <typename InFilter, typename OutFilter>
+ void reset_cancellation_state(const Handler&,
+ ASIO_MOVE_ARG(InFilter),
+ ASIO_MOVE_ARG(OutFilter))
+ {
+ }
+
+ ASIO_CONSTEXPR cancellation_type_t cancelled() const ASIO_NOEXCEPT
+ {
+ return cancellation_type::none;
+ }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP