Re: Does boost promise/future support corroutines?

From: Gavin Lambert (boost_at_[hidden])
Date: 2020-10-18 21:55:34

On 17/10/2020 05:45, David Frank wrote:
> Does boost promise/future support coroutines?
> 
> For example, the get call only block the running coroutine, instead of 
> the whole thread?

That depends which ones you mean (on both ends).

The promise/future from Boost.Thread will block the whole thread, naturally.

The promise/future from Boost.Fiber will block the whole fiber (which is 
a type of coroutine, but is different from C++20 coroutines).

Futures and coroutines aren't really a great fit together, since the 
former only has a blocking interface while the latter is intended to be 
used in an entirely non-blocking fashion.

If you're wanting to work with C++20 style coroutines, probably your 
best bet is to use a library such as CppCoro.  While this doesn't have a 
"future" class per se, it does have the equivalent async version as 
"task", and it's possible to do sync waits or wrap it in a future if you 
do want to block a thread for some reason.