From: Rob Pike <r@golang.org>
Date: Wed, 20 Oct 2010 04:25:28 +0000 (-0700)
Subject: reflect: add InterfaceValue.Get to enable setting of an interface
X-Git-Tag: weekly.2010-10-20~14
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=97f3a80d9319a644da91c8d49b3fd788bee185c0;p=gostls13.git

reflect: add InterfaceValue.Get to enable setting of an interface
value (through unsafe means) without having a reflect.Type
of type *interface{} (pointer to interface).  This is needed to make
gob able to handle interface values by a method analogous to
the way it handles maps.

R=rsc
CC=golang-dev
https://golang.org/cl/2597041
---

diff --git a/src/pkg/reflect/value.go b/src/pkg/reflect/value.go
index dd677b4ea8..60e0d90deb 100644
--- a/src/pkg/reflect/value.go
+++ b/src/pkg/reflect/value.go
@@ -843,11 +843,17 @@ type InterfaceValue struct {
 	value "interface"
 }
 
-// No Get because v.Interface() is available.
-
 // IsNil returns whether v is a nil interface value.
 func (v *InterfaceValue) IsNil() bool { return v.Interface() == nil }
 
+// No single uinptr Get because v.Interface() is available.
+
+// Get returns the two words that represent an interface in the runtime.
+// Those words are useful only when playing unsafe games.
+func (v *InterfaceValue) Get() [2]uintptr {
+	return *(*[2]uintptr)(v.addr)
+}
+
 // Elem returns the concrete value stored in the interface value v.
 func (v *InterfaceValue) Elem() Value { return NewValue(v.Interface()) }