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go spec: adjust notion of Assignability

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This change makes it legal to pass a struct value as receiver
outside the package declaring the struct even if the respective
struct type has non-exported fields.

This is a backwards-compatible language change motivated by the
fact that it is already possible to circumvent the assignment
restriction when calling methods through interfaces (see issue
1402).

R=r, rsc, iant, ken2
CC=golang-dev
https://golang.org/cl/3926044
This commit is contained in:
Robert Griesemer 2011-02-03 10:53:31 -08:00
parent ab15a978fb
commit fa3d0d73f0
1 changed files with 5 additions and 4 deletions
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9
doc/go_spec.html
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@ -1349,11 +1349,12 @@ by a value of type <code>T</code>.
</ul>
<p>
If <code>T</code> is a struct type, either all fields of <code>T</code>
must be <a href="#Exported_identifiers">exported</a>, or the assignment must be in
the same package in which <code>T</code> is declared.
If <code>T</code> is a struct type with non-<a href="#Exported_identifiers">exported</a>
fields, the assignment must be in the same package in which <code>T</code> is declared,
or <code>x</code> must be the receiver of a method call.
In other words, a struct value can be assigned to a struct variable only if
every field of the struct may be legally assigned individually by the program.
every field of the struct may be legally assigned individually by the program,
or if the assignment is initializing the receiver of a method of the struct type.
</p>
<p>