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reflect: MethodByName

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It's more common to ask for methods by name than by index, so might
as well make it easy to do so.

R=rsc
CC=golang-dev
https://golang.org/cl/4639083
This commit is contained in:
Rob Pike 2011-06-29 13:11:49 +10:00
parent 161deaa85c
commit 22484e2262
3 changed files with 108 additions and 5 deletions
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46
src/pkg/reflect/all_test.go
View file

@ -1050,6 +1050,12 @@ type Point struct {
x, y int
}
// This will be index 0.
func (p Point) AnotherMethod(scale int) int {
return -1
}
// This will be index 1.
func (p Point) Dist(scale int) int {
// println("Point.Dist", p.x, p.y, scale)
return p.x*p.x*scale + p.y*p.y*scale
@ -1058,26 +1064,52 @@ func (p Point) Dist(scale int) int {
func TestMethod(t *testing.T) {
// Non-curried method of type.
p := Point{3, 4}
i := TypeOf(p).Method(0).Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int()
i := TypeOf(p).Method(1).Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Type Method returned %d; want 250", i)
}
i = TypeOf(&p).Method(0).Func.Call([]Value{ValueOf(&p), ValueOf(10)})[0].Int()
m, ok := TypeOf(p).MethodByName("Dist")
if !ok {
t.Fatalf("method by name failed")
}
m.Func.Call([]Value{ValueOf(p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Type MethodByName returned %d; want 250", i)
}
i = TypeOf(&p).Method(1).Func.Call([]Value{ValueOf(&p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Pointer Type Method returned %d; want 250", i)
}
m, ok = TypeOf(&p).MethodByName("Dist")
if !ok {
t.Fatalf("ptr method by name failed")
}
i = m.Func.Call([]Value{ValueOf(&p), ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Pointer Type MethodByName returned %d; want 250", i)
}
// Curried method of value.
i = ValueOf(p).Method(0).Call([]Value{ValueOf(10)})[0].Int()
i = ValueOf(p).Method(1).Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Value Method returned %d; want 250", i)
}
i = ValueOf(p).MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Value MethodByName returned %d; want 250", i)
}
// Curried method of pointer.
i = ValueOf(&p).Method(0).Call([]Value{ValueOf(10)})[0].Int()
i = ValueOf(&p).Method(1).Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Value Method returned %d; want 250", i)
t.Errorf("Pointer Value Method returned %d; want 250", i)
}
i = ValueOf(&p).MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Pointer Value MethodByName returned %d; want 250", i)
}
// Curried method of interface value.
@ -1094,6 +1126,10 @@ func TestMethod(t *testing.T) {
if i != 250 {
t.Errorf("Interface Method returned %d; want 250", i)
}
i = pv.MethodByName("Dist").Call([]Value{ValueOf(10)})[0].Int()
if i != 250 {
t.Errorf("Interface MethodByName returned %d; want 250", i)
}
}
func TestInterfaceSet(t *testing.T) {