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spec: clarify that slice a expression shares underlying array with operand

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The spec was not very precise as to what happens with respect to sharing
if a sliced operand is (a pointer to) an array. Added a small clarification
and a supporting example.

Fixes #31689.

Change-Id: Ic49351bec2033abd3f5428154ec3e9a7c2c9eaa5
Reviewed-on: https://go-review.googlesource.com/c/go/+/177139
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Robert Griesemer 2019-05-14 10:22:04 -07:00
parent 02d24fc252
commit 1e3ffb0c90
1 changed files with 9 additions and 1 deletions
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10
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of May 13, 2019",
"Subtitle": "Version of May 14, 2019",
"Path": "/ref/spec"
}-->
@ -3262,6 +3262,14 @@ is a <code>nil</code> slice. Otherwise, if the result is a slice, it shares its
array with the operand.
</p>
<pre>
var a [10]int
s1 := a[3:7] // underlying array of s1 is array a; &s1[2] == &a[5]
s2 := s1[1:4] // underlying array of s2 is underlying array of s1 which is array a; &s2[1] == &a[5]
s2[1] = 42 // s2[1] == s1[2] == a[5] == 42; they all refer to the same underlying array element
</pre>
<h4>Full slice expressions</h4>
<p>