mirror of
https://github.com/matrix-construct/construct
synced 2024-10-31 10:58:54 +01:00
106 lines
2.6 KiB
C++
106 lines
2.6 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_CTX_ASYNC_H
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namespace ircd::ctx
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{
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template<class F,
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class... A>
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constexpr bool is_void_result();
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template<class F,
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class... A>
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using future_void = typename std::enable_if<is_void_result<F, A...>(), future<void>>::type;
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template<class F,
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class... A>
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using future_value = typename std::enable_if<!is_void_result<F, A...>(),
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future<typename std::result_of<F (A...)>::type>>::type;
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template<size_t stack_size = DEFAULT_STACK_SIZE,
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context::flags flags = context::flags(0),
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class F,
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class... A>
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future_value<F, A...> async(F&& f, A&&... a);
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template<size_t stack_size = DEFAULT_STACK_SIZE,
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context::flags flags = context::flags(0),
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class F,
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class... A>
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future_void<F, A...> async(F&& f, A&&... a);
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}
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template<size_t stack_size,
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ircd::ctx::context::flags flags,
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class F,
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class... A>
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ircd::ctx::future_value<F, A...>
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ircd::ctx::async(F&& f,
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A&&... a)
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{
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using R = typename std::result_of<F (A...)>::type;
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promise<R> p;
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future<R> ret{p};
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auto wrapper
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{
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[p(std::move(p)), func(std::bind(std::forward<F>(f), std::forward<A>(a)...))]
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() mutable
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{
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p.set_value(func());
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}
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};
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//TODO: DEFER_POST?
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context(stack_size, std::move(wrapper), context::DETACH | context::POST | flags);
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return ret;
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}
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template<size_t stack_size,
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ircd::ctx::context::flags flags,
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class F,
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class... A>
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ircd::ctx::future_void<F, A...>
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ircd::ctx::async(F&& f,
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A&&... a)
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{
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using R = typename std::result_of<F (A...)>::type;
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auto func
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{
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std::bind(std::forward<F>(f), std::forward<A>(a)...)
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};
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promise<R> p;
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future<R> ret{p};
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auto wrapper
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{
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[p(std::move(p)), func(std::bind(std::forward<F>(f), std::forward<A>(a)...))]
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() mutable
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{
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func();
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p.set_value();
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}
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};
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//TODO: DEFER_POST?
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context(stack_size, std::move(wrapper), context::DETACH | context::POST | flags);
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return ret;
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}
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template<class F,
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class... A>
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constexpr bool
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ircd::ctx::is_void_result()
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{
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return std::is_void<typename std::result_of<F (A...)>::type>::value;
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}
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