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// $G $D/$F.go && $L $F.$A && ./$A.out
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Implicit methods for embedded types.
// Mixed pointer and non-pointer receivers.
package main
type T int
var nv, np int
func (t T) V() {
if t != 42 {
panic(t)
}
nv++
}
func (t *T) P() {
if *t != 42 {
println(t, *t)
panic("fail")
}
np++
}
type V interface {
V()
}
type P interface {
P()
V()
}
type S struct {
T
}
type SP struct {
*T
}
func main() {
var t T
var v V
var p P
t = 42
t.P()
t.V()
v = t
v.V()
p = &t
p.P()
p.V()
v = &t
v.V()
// p = t // ERROR
var i interface{} = t
if _, ok := i.(P); ok {
println("dynamic i.(P) succeeded incorrectly")
panic("fail")
}
// println("--struct--");
var s S
s.T = 42
s.P()
s.V()
v = s
s.V()
p = &s
p.P()
p.V()
v = &s
v.V()
// p = s // ERROR
var j interface{} = s
if _, ok := j.(P); ok {
println("dynamic j.(P) succeeded incorrectly")
panic("fail")
}
// println("--struct pointer--");
var sp SP
sp.T = &t
sp.P()
sp.V()
v = sp
sp.V()
p = &sp
p.P()
p.V()
v = &sp
v.V()
p = sp // not error
p.P()
p.V()
if nv != 13 || np != 7 {
println("bad count", nv, np)
panic("fail")
}
}
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