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spec: clarify unsafe.Pointer conversions

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A pointer type of underlying type unsafe.Pointer can be used in
unsafe conversions. Document unfortunate status quo.

Fixes #19306.

Change-Id: I28172508a200561f8df366bbf2c2807ef3b48c97
Reviewed-on: https://go-review.googlesource.com/42132
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2017-04-28 10:32:31 -07:00
parent 541029636a
commit 86f5f7fdfa
1 changed files with 3 additions and 3 deletions
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6
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of May 3, 2017",
"Subtitle": "Version of May 9, 2017",
"Path": "/ref/spec"
}-->
@ -5968,7 +5968,7 @@ println like print but prints spaces between arguments and a newline at the e
<p>
Implementation restriction: <code>print</code> and <code>println</code> need not
accept arbitrary argument types, but printing of boolean, numeric, and string
<a href="#Types">types</a> must be supported.
<a href="#Types">types</a> must be supported.
</p>
<h2 id="Packages">Packages</h2>
@ -6431,7 +6431,7 @@ func Sizeof(variable ArbitraryType) uintptr
A <code>Pointer</code> is a <a href="#Pointer_types">pointer type</a> but a <code>Pointer</code>
value may not be <a href="#Address_operators">dereferenced</a>.
Any pointer or value of <a href="#Types">underlying type</a> <code>uintptr</code> can be converted to
a <code>Pointer</code> type and vice versa.
a type of underlying type <code>Pointer</code> and vice versa.
The effect of converting between <code>Pointer</code> and <code>uintptr</code> is implementation-defined.
</p>