From: Rob Pike <r@golang.org>
Date: Mon, 4 Jul 2011 01:45:31 +0000 (+1000)
Subject: reflect: allow Len on String values.
X-Git-Tag: weekly.2011-07-07~43
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=db0e3580225ef11a3a8be0de608cb56ddd4aee55;p=gostls13.git

reflect: allow Len on String values.
It's probably just an oversight that it doesn't work,
perhaps caused by analogy with Cap.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4634125
---

diff --git a/src/pkg/reflect/value.go b/src/pkg/reflect/value.go
index 889d9455bd..bfeb3267c7 100644
--- a/src/pkg/reflect/value.go
+++ b/src/pkg/reflect/value.go
@@ -933,7 +933,7 @@ func (v Value) Kind() Kind {
 }
 
 // Len returns v's length.
-// It panics if v's Kind is not Array, Chan, Map, or Slice.
+// It panics if v's Kind is not Array, Chan, Map, Slice, or String.
 func (v Value) Len() int {
 	iv := v.internal()
 	switch iv.kind {
@@ -945,6 +945,8 @@ func (v Value) Len() int {
 		return int(maplen(iv.word))
 	case Slice:
 		return (*SliceHeader)(iv.addr).Len
+	case String:
+		return (*StringHeader)(iv.addr).Len
 	}
 	panic(&ValueError{"reflect.Value.Len", iv.kind})
 }