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+//
+// experimental/cancellation_condition.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_EXPERIMENTAL_CANCELLATION_CONDITION_HPP
+#define ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <exception>
+#include "asio/cancellation_type.hpp"
+#include "asio/error_code.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace experimental {
+
+/// Wait for all operations to complete.
+class wait_for_all
+{
+public:
+ template <typename... Args>
+ ASIO_CONSTEXPR cancellation_type_t operator()(
+ Args&&...) const ASIO_NOEXCEPT
+ {
+ return cancellation_type::none;
+ }
+};
+
+/// Wait until an operation completes, then cancel the others.
+class wait_for_one
+{
+public:
+ ASIO_CONSTEXPR explicit wait_for_one(
+ cancellation_type_t cancel_type = cancellation_type::all)
+ : cancel_type_(cancel_type)
+ {
+ }
+
+ template <typename... Args>
+ ASIO_CONSTEXPR cancellation_type_t operator()(
+ Args&&...) const ASIO_NOEXCEPT
+ {
+ return cancel_type_;
+ }
+
+private:
+ cancellation_type_t cancel_type_;
+};
+
+/// Wait until an operation completes without an error, then cancel the others.
+/**
+ * If no operation completes without an error, waits for completion of all
+ * operations.
+ */
+class wait_for_one_success
+{
+public:
+ ASIO_CONSTEXPR explicit wait_for_one_success(
+ cancellation_type_t cancel_type = cancellation_type::all)
+ : cancel_type_(cancel_type)
+ {
+ }
+
+ ASIO_CONSTEXPR cancellation_type_t
+ operator()() const ASIO_NOEXCEPT
+ {
+ return cancel_type_;
+ }
+
+ template <typename E, typename... Args>
+ ASIO_CONSTEXPR typename constraint<
+ !is_same<typename decay<E>::type, asio::error_code>::value
+ && !is_same<typename decay<E>::type, std::exception_ptr>::value,
+ cancellation_type_t
+ >::type operator()(const E&, Args&&...) const ASIO_NOEXCEPT
+ {
+ return cancel_type_;
+ }
+
+ template <typename E, typename... Args>
+ ASIO_CONSTEXPR typename constraint<
+ is_same<typename decay<E>::type, asio::error_code>::value
+ || is_same<typename decay<E>::type, std::exception_ptr>::value,
+ cancellation_type_t
+ >::type operator()(const E& e, Args&&...) const ASIO_NOEXCEPT
+ {
+ return !!e ? cancellation_type::none : cancel_type_;
+ }
+
+private:
+ cancellation_type_t cancel_type_;
+};
+
+/// Wait until an operation completes with an error, then cancel the others.
+/**
+ * If no operation completes with an error, waits for completion of all
+ * operations.
+ */
+class wait_for_one_error
+{
+public:
+ ASIO_CONSTEXPR explicit wait_for_one_error(
+ cancellation_type_t cancel_type = cancellation_type::all)
+ : cancel_type_(cancel_type)
+ {
+ }
+
+ ASIO_CONSTEXPR cancellation_type_t
+ operator()() const ASIO_NOEXCEPT
+ {
+ return cancellation_type::none;
+ }
+
+ template <typename E, typename... Args>
+ ASIO_CONSTEXPR typename constraint<
+ !is_same<typename decay<E>::type, asio::error_code>::value
+ && !is_same<typename decay<E>::type, std::exception_ptr>::value,
+ cancellation_type_t
+ >::type operator()(const E&, Args&&...) const ASIO_NOEXCEPT
+ {
+ return cancellation_type::none;
+ }
+
+ template <typename E, typename... Args>
+ ASIO_CONSTEXPR typename constraint<
+ is_same<typename decay<E>::type, asio::error_code>::value
+ || is_same<typename decay<E>::type, std::exception_ptr>::value,
+ cancellation_type_t
+ >::type operator()(const E& e, Args&&...) const ASIO_NOEXCEPT
+ {
+ return !!e ? cancel_type_ : cancellation_type::none;
+ }
+
+private:
+ cancellation_type_t cancel_type_;
+};
+
+} // namespace experimental
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP