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spec: unsafe.Alignof/Sizeof also accept non-variable arguments

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Both gc and gccgo permit calls such as unsafe.Sizeof(42). The
spec only permits variable arguments. This is a (backward-compatible)
spec change reflecting the status quo. Seems preferrable over
restricting the compilers.

R=r, rsc, iant, ken
CC=golang-dev
https://golang.org/cl/6494140
This commit is contained in:
Robert Griesemer 2012-09-17 12:23:41 -07:00
parent af832ac0b9
commit c7631f555f
1 changed files with 4 additions and 3 deletions
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7
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{ <!--{
"Title": "The Go Programming Language Specification", "Title": "The Go Programming Language Specification",
"Subtitle": "Version of September 13, 2012", "Subtitle": "Version of September 17, 2012",
"Path": "/ref/spec" "Path": "/ref/spec"
}--> }-->
@ -5487,8 +5487,9 @@ Any pointer or value of <a href="#Types">underlying type</a> <code>uintptr</code
a <code>Pointer</code> and vice versa. a <code>Pointer</code> and vice versa.
</p> </p>
<p> <p>
The function <code>Sizeof</code> takes an expression denoting a The functions <code>Alignof</code> and <code>Sizeof</code> take an expression <code>x</code>
variable of any type and returns the size of the variable in bytes. of any type and return the alignment or size, respectively, of a hypothetical variable <code>v</code>
as if <code>v</code> was declared via <code>var v = x</code>.
</p> </p>
<p> <p>
The function <code>Offsetof</code> takes a selector (§<a href="#Selectors">Selectors</a>) denoting a struct The function <code>Offsetof</code> takes a selector (§<a href="#Selectors">Selectors</a>) denoting a struct