153 lines
3.7 KiB
C++
153 lines
3.7 KiB
C++
//
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// experimental/cancellation_condition.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2024 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP
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#define ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include <exception>
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#include "asio/cancellation_type.hpp"
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#include "asio/error_code.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace experimental {
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/// Wait for all operations to complete.
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class wait_for_all
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{
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public:
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template <typename... Args>
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constexpr cancellation_type_t operator()(Args&&...) const noexcept
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{
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return cancellation_type::none;
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}
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};
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/// Wait until an operation completes, then cancel the others.
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class wait_for_one
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{
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public:
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constexpr explicit wait_for_one(
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cancellation_type_t cancel_type = cancellation_type::all)
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: cancel_type_(cancel_type)
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{
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}
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template <typename... Args>
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constexpr cancellation_type_t operator()(Args&&...) const noexcept
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{
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return cancel_type_;
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}
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private:
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cancellation_type_t cancel_type_;
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};
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/// Wait until an operation completes without an error, then cancel the others.
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/**
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* If no operation completes without an error, waits for completion of all
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* operations.
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*/
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class wait_for_one_success
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{
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public:
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constexpr explicit wait_for_one_success(
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cancellation_type_t cancel_type = cancellation_type::all)
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: cancel_type_(cancel_type)
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{
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}
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constexpr cancellation_type_t
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operator()() const noexcept
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{
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return cancel_type_;
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}
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template <typename E, typename... Args>
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constexpr constraint_t<
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!is_same<decay_t<E>, asio::error_code>::value
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&& !is_same<decay_t<E>, std::exception_ptr>::value,
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cancellation_type_t
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> operator()(const E&, Args&&...) const noexcept
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{
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return cancel_type_;
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}
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template <typename E, typename... Args>
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constexpr constraint_t<
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is_same<decay_t<E>, asio::error_code>::value
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|| is_same<decay_t<E>, std::exception_ptr>::value,
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cancellation_type_t
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> operator()(const E& e, Args&&...) const noexcept
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{
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return !!e ? cancellation_type::none : cancel_type_;
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}
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private:
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cancellation_type_t cancel_type_;
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};
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/// Wait until an operation completes with an error, then cancel the others.
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/**
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* If no operation completes with an error, waits for completion of all
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* operations.
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*/
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class wait_for_one_error
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{
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public:
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constexpr explicit wait_for_one_error(
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cancellation_type_t cancel_type = cancellation_type::all)
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: cancel_type_(cancel_type)
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{
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}
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constexpr cancellation_type_t operator()() const noexcept
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{
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return cancellation_type::none;
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}
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template <typename E, typename... Args>
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constexpr constraint_t<
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!is_same<decay_t<E>, asio::error_code>::value
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&& !is_same<decay_t<E>, std::exception_ptr>::value,
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cancellation_type_t
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> operator()(const E&, Args&&...) const noexcept
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{
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return cancellation_type::none;
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}
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template <typename E, typename... Args>
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constexpr constraint_t<
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is_same<decay_t<E>, asio::error_code>::value
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|| is_same<decay_t<E>, std::exception_ptr>::value,
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cancellation_type_t
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> operator()(const E& e, Args&&...) const noexcept
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{
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return !!e ? cancel_type_ : cancellation_type::none;
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}
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private:
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cancellation_type_t cancel_type_;
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};
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} // namespace experimental
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP
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