Re: What is the most useful potential feature which Emacs lacks? A: Autocompletion

[Dmitry Gutov]

On 03.06.2020 15:50, Konstantin Kharlamov wrote:
> On Wed, 2020-06-03 at 15:36 +0300, Dmitry Gutov wrote:
> > On 03.06.2020 14:39, Konstantin Kharlamov wrote:
> > > Lack of such simple but immensely useful feature is so
> > > disappointing
> > > that some years ago I was trying to migrate over to some other
> > > editor.
> >
> > What simple feature? Prediction? Is that like mind reading?
>
> You misunderstand what I say. In technical terms "prediction" here
> means "the timeout set to 0".

Timeout set to 0 means firing completion requests right after every user 
input. If completion is synchronous, that will of course lead to a 
slowdown (depending on how slow the backend is).

For asynchronous ones, it could be fine, if the backing process can 
handle requests at such frequency.

In general, the value of 0 seems wasteful to me, but it should work.

> > As far a multithreading goes, try some backend that uses an external
> > program (either of the LSP clients, or irony, rtags, etc). That's a
> > basic kind of concurrency already available in Emacs.
>
>
> Just to make sure: and it not gonna lag if I set timeout to 0? If yes,
> then great to know, maybe I fell behind recent developments, I should
> try it then.

To be 100% sure, you should try it yourself (I don't do C/C++). Maybe 
someone else here can testify, though.