include/boost/capy/detail/await_suspend_helper.hpp

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1		//
2		// Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com)
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/capy
8		//
9
10		#ifndef BOOST_CAPY_DETAIL_AWAIT_SUSPEND_HELPER_HPP
11		#define BOOST_CAPY_DETAIL_AWAIT_SUSPEND_HELPER_HPP
12
13		#include <coroutine>
14		#include <boost/capy/ex/io_env.hpp>
15
16		#include <type_traits>
17
18		namespace boost {
19		namespace capy {
20		namespace detail {
21
22		// Helper to normalize await_suspend return types to std::coroutine_handle<>
23		template<typename Awaitable>
24	7	std::coroutine_handle<> call_await_suspend(
25		Awaitable* a,
26		std::coroutine_handle<> h,
27		io_env const* env)
28		{
29		using R = decltype(a->await_suspend(h, env));
30		if constexpr (std::is_void_v<R>)
31		{
32	✗	a->await_suspend(h, env);
33	✗	return std::noop_coroutine();
34		}
35		else if constexpr (std::is_same_v<R, bool>)
36		{
37		if(a->await_suspend(h, env))
38		return std::noop_coroutine();
39		return h;
40		}
41		else
42		{
43	7	return a->await_suspend(h, env);
44		}
45		}
46
47		} // namespace detail
48		} // namespace capy
49		} // namespace boost
50
51		#endif
52