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spec: clarify unsafe.Offsetof

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Fixes #4905.

R=rsc, r, iant, ken
CC=golang-dev
https://golang.org/cl/7583043
This commit is contained in:
Robert Griesemer 2013-03-07 20:11:37 -08:00
parent 7663ffcae6
commit 51338095eb
1 changed files with 5 additions and 3 deletions
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8
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of March 4, 2013",
"Subtitle": "Version of March 7, 2013",
"Path": "/ref/spec"
}-->
@ -5734,8 +5734,10 @@ as if <code>v</code> was declared via <code>var v = x</code>.
</p>
<p>
The function <code>Offsetof</code> takes a (possibly parenthesized) <a href="#Selectors">selector</a>
denoting a struct field of any type and returns the field offset in bytes relative to the
struct's address.
<code>s.f</code>, denoting a field <code>f</code> of the struct denoted by <code>s</code>
or <code>*s</code>, and returns the field offset in bytes relative to the struct's address.
If <code>f</code> is an <a href="#Struct_types">embedded field</a>, it must be reachable
without pointer indirections through fields of the struct.
For a struct <code>s</code> with field <code>f</code>:
</p>