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spec: clarify that iota is incremented even if not used in a const spec

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Slightly modified an example.

Fixes #13371.

Change-Id: I25d260d4200086a0ef9725950132b760657610c5
Reviewed-on: https://go-review.googlesource.com/17209
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Robert Griesemer 2015-11-25 13:18:49 -08:00
parent 8818cc8885
commit 09e900eb33
1 changed files with 9 additions and 8 deletions
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17
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of October 20, 2015",
"Subtitle": "Version of November 25, 2015",
"Path": "/ref/spec"
}-->
@ -1789,26 +1789,27 @@ It can be used to construct a set of related constants:
</p>
<pre>
const ( // iota is reset to 0
const ( // iota is reset to 0
c0 = iota // c0 == 0
c1 = iota // c1 == 1
c2 = iota // c2 == 2
)
const (
a = 1 &lt;&lt; iota // a == 1 (iota has been reset)
const ( // iota is reset to 0
a = 1 &lt;&lt; iota // a == 1
b = 1 &lt;&lt; iota // b == 2
c = 1 &lt;&lt; iota // c == 4
c = 3 // c == 3 (iota is not used but still incremented)
d = 1 &lt;&lt; iota // d == 8
)
const (
const ( // iota is reset to 0
u = iota * 42 // u == 0 (untyped integer constant)
v float64 = iota * 42 // v == 42.0 (float64 constant)
w = iota * 42 // w == 84 (untyped integer constant)
)
const x = iota // x == 0 (iota has been reset)
const y = iota // y == 0 (iota has been reset)
const x = iota // x == 0 (iota has been reset)
const y = iota // y == 0 (iota has been reset)
</pre>
<p>