code review 6333057: spec: clarify receive operator

spec: clarify receive operator

- receiving from a closed channel returns immediately
- in the ,ok form, the 2nd result is of type bool, not
  just boolean (gc and ggcgo agree).

Per dsymonds' suggestion.

[gri, 2012-06-22 21:55:59]

Hello r@golang.org, rsc@golang.org, ken@golang.org, iant@golang.org,
dsymonds@golang.org (cc: golang-dev@googlegroups.com),

I'd like you to review this change to
https://code.google.com/p/go

[dsymonds, 2012-06-22 22:10:33]

LGTM FWIW

[r, 2012-06-22 22:19:56]

http://codereview.appspot.com/6333057/diff/6001/doc/go_spec.html
File doc/go_spec.html (right):

http://codereview.appspot.com/6333057/diff/6001/doc/go_spec.html#newcode3188
doc/go_spec.html:3188: <a href="#The_zero_value">zero value</a>.
Receiving from a <a href="#Close">closed</a> channel always succeeds,
immediately returning the element type's <a href="#The_zero_value">zero
value</a>.

http://codereview.appspot.com/6333057/diff/6001/doc/go_spec.html#newcode3212
doc/go_spec.html:3212: received value is a zero value because the channel is
closed and empty.
s/zero value/& that was received/

[gri, 2012-06-22 23:39:51]

PTAL.

Modified and uploaded.

http://codereview.appspot.com/6333057/diff/6001/doc/go_spec.html
File doc/go_spec.html (right):

http://codereview.appspot.com/6333057/diff/6001/doc/go_spec.html#newcode3188
doc/go_spec.html:3188: <a href="#The_zero_value">zero value</a>.
On 2012/06/22 22:19:56, r wrote:
> Receiving from a <a href="#Close">closed</a> channel always succeeds,
> immediately returning the element type's <a href="#The_zero_value">zero
> value</a>.

Done.

http://codereview.appspot.com/6333057/diff/6001/doc/go_spec.html#newcode3212
doc/go_spec.html:3212: received value is a zero value because the channel is
closed and empty.
On 2012/06/22 22:19:56, r wrote:
> s/zero value/& that was received/

Modified.

[r, 2012-06-22 23:53:20]

LGTM

[iant, 2012-06-23 00:18:32]

LGTM

[gri, 2012-06-25 18:28:35]

*** Submitted as http://code.google.com/p/go/source/detail?r=c72ac7873261 ***

spec: clarify receive operator

- receiving from a closed channel returns immediately
- in the ,ok form, the 2nd result is of type bool, not
  just boolean (gc and ggcgo agree).

Per dsymonds' suggestion.

R=r, rsc, ken, iant, dsymonds
CC=golang-dev
http://codereview.appspot.com/6333057