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spec: result type of a comparison is always untyped bool

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For details see the cited issue.

Fixes #4793.

R=rsc, r, iant, ken
CC=golang-dev
https://golang.org/cl/7524044
This commit is contained in:
Robert Griesemer 2013-03-11 09:16:29 -07:00
parent fadeafac93
commit c729ed631f
1 changed files with 9 additions and 12 deletions
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21
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of March 7, 2013",
"Subtitle": "Version of March 11, 2013",
"Path": "/ref/spec"
}-->
@ -3108,7 +3108,7 @@ not occur. For instance, it may not assume that <code>x &lt; x + 1</code> is alw
<h3 id="Comparison_operators">Comparison operators</h3>
<p>
Comparison operators compare two operands and yield a boolean value.
Comparison operators compare two operands and yield an untyped boolean value.
</p>
<pre class="grammar">
@ -3216,20 +3216,17 @@ Comparison of pointer, channel, and interface values to <code>nil</code>
is also allowed and follows from the general rules above.
</p>
<p>
The result of a comparison can be assigned to any boolean type.
If the context does not demand a specific boolean type,
the result has type <code>bool</code>.
</p>
<pre>
type MyBool bool
const c = 3 < 4 // c is the untyped bool constant true
type MyBool bool
var x, y int
var (
b1 MyBool = x == y // result of comparison has type MyBool
b2 bool = x == y // result of comparison has type bool
b3 = x == y // result of comparison has type bool
// The result of a comparison is an untyped bool.
// The usual assignment rules apply.
b3 = x == y // b3 has type bool
b4 bool = x == y // b4 has type bool
b5 MyBool = x == y // b5 has type MyBool
)
</pre>