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reflect: document and test TypeOf(nil)

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Fixes #3549.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/6107047
This commit is contained in:
Rob Pike 2012-04-23 12:07:02 +10:00
parent 0cc8ee9808
commit 53372903c7
2 changed files with 6 additions and 0 deletions
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5
src/pkg/reflect/all_test.go
View File

@ -638,6 +638,7 @@ var (
var deepEqualTests = []DeepEqualTest{ var deepEqualTests = []DeepEqualTest{
// Equalities // Equalities
{nil, nil, true},
{1, 1, true}, {1, 1, true},
{int32(1), int32(1), true}, {int32(1), int32(1), true},
{0.5, 0.5, true}, {0.5, 0.5, true},
@ -696,6 +697,10 @@ func TestDeepEqual(t *testing.T) {
} }
func TestTypeOf(t *testing.T) { func TestTypeOf(t *testing.T) {
// Special case for nil
if typ := TypeOf(nil); typ != nil {
t.Errorf("expected nil type for nil value; got %v", typ)
}
for _, test := range deepEqualTests { for _, test := range deepEqualTests {
v := ValueOf(test.a) v := ValueOf(test.a)
if !v.IsValid() { if !v.IsValid() {

1
src/pkg/reflect/type.go
View File

@ -940,6 +940,7 @@ func toType(p *runtimeType) Type {
} }
// TypeOf returns the reflection Type of the value in the interface{}. // TypeOf returns the reflection Type of the value in the interface{}.
// TypeOf(nil) returns nil.
func TypeOf(i interface{}) Type { func TypeOf(i interface{}) Type {
eface := *(*emptyInterface)(unsafe.Pointer(&i)) eface := *(*emptyInterface)(unsafe.Pointer(&i))
return toType(eface.typ) return toType(eface.typ)