include/boost/corosio/detail/op_base.hpp

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op_base.hpp

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1			//
2			// Copyright (c) 2026 Michael Vandeberg
3			//
4			// Distributed under the Boost Software License, Version 1.0. (See accompanying
5			// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6			//
7			// Official repository: https://github.com/cppalliance/corosio
8			//
9
10			#ifndef BOOST_COROSIO_DETAIL_OP_BASE_HPP
11			#define BOOST_COROSIO_DETAIL_OP_BASE_HPP
12
13			#include <boost/capy/io_result.hpp>
14			#include <boost/capy/ex/executor_ref.hpp>
15			#include <boost/capy/ex/io_env.hpp>
16
17			#include <coroutine>
18			#include <cstddef>
19			#include <stop_token>
20			#include <system_error>
21
22			namespace boost::corosio::detail {
23
24			/* CRTP base for awaitables that return io_result<std::size_t>.
25
26			Derived classes must provide:
27
28			std::coroutine_handle<> dispatch(
29			std::coroutine_handle<> h,
30			capy::executor_ref ex) const;
31
32			which forwards to the backend implementation method, passing
33			token_, &ec_, and &bytes_ as the cancellation/output parameters.
34			*/
35			template<class Derived>
36			class bytes_op_base
37			{
38			friend Derived;
39		2270270x	bytes_op_base() = default;
40
41			public:
42			std::stop_token token_;
43			mutable std::error_code ec_;
44		1135135x	mutable std::size_t bytes_ = 0;
45
46		1135135x	bool await_ready() const noexcept
47			{
48		1135135x	return token_.stop_requested();
49			}
50
51		1135135x	capy::io_result<std::size_t> await_resume() const noexcept
52			{
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56		1135135x	}
57
58		1135135x	auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env)
59			-> std::coroutine_handle<>
60			{
61		1135135x	token_ = env->stop_token;
62		1135135x	return static_cast<Derived const*>(this)->dispatch(
63		1135135x	h, env->executor);
64			}
65			};
66
67			/* CRTP base for awaitables that return io_result<>.
68
69			Derived classes must provide:
70
71			std::coroutine_handle<> dispatch(
72			std::coroutine_handle<> h,
73			capy::executor_ref ex) const;
74
75			which forwards to the backend implementation method, passing
76			token_ and &ec_ as the cancellation/output parameters.
77			*/
78			template<class Derived>
79			class void_op_base
80			{
81			friend Derived;
82		5792x	void_op_base() = default;
83
84			public:
85			std::stop_token token_;
86			mutable std::error_code ec_;
87
88		5792x	bool await_ready() const noexcept
89			{
90		5792x	return token_.stop_requested();
91			}
92
93		5792x	capy::io_result<> await_resume() const noexcept
94			{
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98		5792x	}
99
100		5792x	auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env)
101			-> std::coroutine_handle<>
102			{
103		5792x	token_ = env->stop_token;
104		5792x	return static_cast<Derived const*>(this)->dispatch(
105		5792x	h, env->executor);
106			}
107			};
108
109			} // namespace boost::corosio::detail
110
111			#endif // BOOST_COROSIO_DETAIL_OP_BASE_HPP
112