mirror of
https://github.com/matrix-construct/construct
synced 2024-11-26 00:32:35 +01:00
d9a4f06bf6
This is not a move to c++17. If the compiler happens to have support for c++17 namespace scope resolution, they have been kind enough to backport it to gnu++14. This limits our support for really old c++14 compilers, but that was limited anyway. GCC 6.1 and clang 3.6 tested.
108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
/*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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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auto func(std::bind(std::forward<F>(f), std::forward<A>(a)...));
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auto p(std::make_shared<promise<R>>());
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auto wrapper([p, func(std::move(func))]
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() mutable -> void
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{
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p->set_value(func());
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});
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future<R> ret(*p);
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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(std::bind(std::forward<F>(f), std::forward<A>(a)...));
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auto p(std::make_shared<promise<R>>());
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auto wrapper([p, func(std::move(func))]
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() mutable -> void
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{
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func();
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p->set_value();
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});
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future<R> ret(*p);
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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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