libs/capy/include/boost/capy/detail/await_suspend_helper.hpp

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1		//
2		// Copyright (c) 2025 Vinnie Falco (vinnie dot falco at gmail dot 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 <boost/capy/coro.hpp>
14		#include <boost/capy/ex/executor_ref.hpp>
15
16		#include <stop_token>
17		#include <type_traits>
18
19		namespace boost {
20		namespace capy {
21		namespace detail {
22
23		// Helper to normalize await_suspend return types to coro
24		template<typename Awaitable>
25	✗	coro call_await_suspend(
26		Awaitable* a,
27		coro h,
28		executor_ref ex,
29		std::stop_token token)
30		{
31		using R = decltype(a->await_suspend(h, ex, token));
32		if constexpr (std::is_void_v<R>)
33		{
34	✗	a->await_suspend(h, ex, token);
35	✗	return std::noop_coroutine();
36		}
37		else if constexpr (std::is_same_v<R, bool>)
38		{
39		if(a->await_suspend(h, ex, token))
40		return std::noop_coroutine();
41		return h;
42		}
43		else
44		{
45		return a->await_suspend(h, ex, token);
46		}
47		}
48
49		} // namespace detail
50		} // namespace capy
51		} // namespace boost
52
53		#endif
54