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go spec: clarify address operators.

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Fixes #1445.

R=r, rsc, iant, ken2
CC=golang-dev
https://golang.org/cl/4109041
This commit is contained in:
Robert Griesemer 2011-01-26 11:21:23 -08:00
parent 4e2218968c
commit 0e1d941e5c
1 changed files with 13 additions and 9 deletions
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22
doc/go_spec.html
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@ -1,5 +1,5 @@
<!-- title The Go Programming Language Specification -->
<!-- subtitle Version of January 18, 2011 -->
<!-- subtitle Version of January 26, 2011 -->
<!--
TODO
@ -2053,7 +2053,7 @@ For array and slice literals the following rules apply:
<p>
Taking the address of a composite literal (§<a href="#Address_operators">Address operators</a>)
generates a unique pointer to an instance of the literal's value.
generates a pointer to a unique instance of the literal's value.
</p>
<pre>
var pointer *Point3D = &amp;Point3D{y: 1000}
@ -2983,15 +2983,19 @@ The right operand is evaluated conditionally.
<h3 id="Address_operators">Address operators</h3>
<p>
The address-of operator <code>&amp;</code> generates the address of its operand,
which must be <i>addressable</i>,
For an operand <code>x</code> of type <code>T</code>, the address operation
<code>&amp;x</code> generates a pointer of type <code>*T</code> to <code>x</code>.
The operand must be <i>addressable</i>,
that is, either a variable, pointer indirection, or slice indexing
operation;
or a field selector of an addressable struct operand;
operation; or a field selector of an addressable struct operand;
or an array indexing operation of an addressable array.
Given an operand of pointer type, the pointer indirection
operator <code>*</code> retrieves the value pointed
to by the operand.
As an exception to the addressability requirement, <code>x</code> may also be a
<a href="#Composite_literals">composite literal</a>.
</p>
<p>
For an operand <code>x</code> of pointer type <code>*T</code>, the pointer
indirection <code>*x</code> denotes the value of type <code>T</code> pointed
to by <code>x</code>.
</p>
<pre>