Re: [go-nuts] Is there a way to clear a map similar to slice = slice[:0]?

[Peter Edge]

Yes, actually saw that a bit after I sent this email. Thanks for the link
though, appreciate it :-)

On Mon, Aug 13, 2018 at 11:08 AM roger peppe  wrote:

> I believe this optimisation has been implemented now.
> Have you tried using Go 1.11 beta (or Go tip) ?
> See https://tip.golang.org/doc/go1.11#performance-compiler
>
>
> On 12 August 2018 at 11:07, Peter Edge  wrote:
> > With slices, you can do
> >
> > slice = slice[:0]
> >
> > to remove the values from the slice, but keep the backing slice with the
> > same capacity (although the elements aren't marked for GC I believe, if
> > that's a concern). With maps, is there a similar pattern? I've tried:
> >
> > for key := range m {
> >  delete(m, key)
> > }
> >
> > But this doesn't seem to work, I still see allocations (and it causes a
> > significant performance hit, which makes sense).
> >
> > Even something similar to https://golang.org/cl/137880043 if we had to
> clear
> > the actual values would be great.
> >
> > --
> > You received this message because you are subscribed to the Google Groups
> > "golang-nuts" group.
> > To unsubscribe from this group and stop receiving emails from it, send an
> > email to golang-nuts+unsubscr...@googlegroups.com.
> > For more options, visit https://groups.google.com/d/optout.
>

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[go-nuts] Is there a way to clear a map similar to slice = slice[:0]?

[Peter Edge]

With slices, you can do

slice = slice[:0]

to remove the values from the slice, but keep the backing slice with the 
same capacity (although the elements aren't marked for GC I believe, if 
that's a concern). With maps, is there a similar pattern? I've tried:

for key := range m {
 delete(m, key)
}

But this doesn't seem to work, I still see allocations (and it causes a 
significant performance hit, which makes sense).

Even something similar to https://golang.org/cl/137880043 if we had to 
clear the actual values would be great.

-- 
You received this message because you are subscribed to the Google Groups 
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.