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spec: add example for method value in case of embedded method

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So it's clear to the reader that if "M" is a promoted method from
embedded field "T", then "x.M" will be expanded to "x.T.M" during the
evaluation of the method value.

Fixes #47863

Change-Id: Id3b82127a2054584b6842c487f6e15c3102dc9fe
Reviewed-on: https://go-review.googlesource.com/c/go/+/344209
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Cuong Manh Le 2021-08-22 12:07:14 +07:00
parent f457ecc7f0
commit aeec6dbfe0
1 changed files with 13 additions and 1 deletions
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14
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of Jul 26, 2021",
"Subtitle": "Version of Aug 23, 2021",
"Path": "/ref/spec"
}-->
@ -3000,6 +3000,18 @@ method value; the saved copy is then used as the receiver in any calls,
which may be executed later.
</p>
<pre>
type S struct { *T }
type T int
func (t T) M() { print(t) }
t := new(T)
s := S{T: t}
f := t.M // receiver *t is evaluated and stored in f
g := s.M // receiver *(s.T) is evaluated and stored in g
*t = 42 // does not affect stored receivers in f and g
</pre>
<p>
The type <code>T</code> may be an interface or non-interface type.
</p>