Re: [boost] Promise/A+ like javascript in cpp

Subject: Re: [boost] Promise/A+ like javascript in cpp
From: hawk x (xhawk18_at_[hidden])
Date: 2018-07-27 02:13:39

boost::coroutine and std::future are all excellent solutions for
concurrency programming.
But if there's many concurrent tasks, event-loop based multi-task in SINGLE
thread will have the best performance.

while std::future is designed for mulitthread, and std::future::then is not
suitable for event-loop based multi-task in SINGLE thread,
that's why I wrote "promise-cpp".

2018-07-27 8:50 GMT+08:00 Gavin Lambert via Boost <boost_at_[hidden]>:

> On 26/07/2018 00:15, hawk x wrote:
>
>> Javascript Promise creates a task chain to help develop asynchronized
>> application with single thread.
>>
>> I did not find a good implement of this kind of "Promise" in c++
>>
>
> std::future::then was proposed for C++17, but didn't make it in.  Boost
> does support it, however, as does an STL that implements the Concurrency TS
> (as std::experimental::future::then).
>
> https://www.boost.org/doc/libs/1_67_0/doc/html/thread/synchr
> onization.html#thread.synchronization.futures.then
>
>
> Additionally, Boost.Asio supports using coroutines for implementing
> asynchronous tasks, which are even better than a then-chain and read even
> more like plain synchronous code.
>
> https://www.boost.org/doc/libs/1_67_0/doc/html/boost_asio/
> overview/core/spawn.html
>
> https://www.boost.org/doc/libs/1_67_0/doc/html/boost_asio/
> example/cpp11/spawn/echo_server.cpp
>
>
> Currently coroutines are a pure library feature (supported by
> Boost.Context and Boost.Coroutine), but they are expected to be supported
> directly by C++20 compilers, and by C++17 compilers that implement the
> Coroutine TS (VS 2017 already supports co_await, for example).
>
> https://www.boost.org/doc/libs/1_67_0/doc/html/boost_asio/
> overview/core/coroutines_ts.html
>
> https://www.boost.org/doc/libs/1_67_0/doc/html/boost_asio/
> examples/cpp17_examples.html
>
>
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