// run | |
// 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. | |
package main | |
import "fmt" | |
type Element interface { | |
} | |
type Vector struct { | |
nelem int | |
elem []Element | |
} | |
func New() *Vector { | |
v := new(Vector) | |
v.nelem = 0 | |
v.elem = make([]Element, 10) | |
return v | |
} | |
func (v *Vector) At(i int) Element { | |
return v.elem[i] | |
} | |
func (v *Vector) Insert(e Element) { | |
v.elem[v.nelem] = e | |
v.nelem++ | |
} | |
func main() { | |
type I struct{ val int } | |
i0 := new(I) | |
i0.val = 0 | |
i1 := new(I) | |
i1.val = 11 | |
i2 := new(I) | |
i2.val = 222 | |
i3 := new(I) | |
i3.val = 3333 | |
i4 := new(I) | |
i4.val = 44444 | |
v := New() | |
r := "hi\n" | |
v.Insert(i4) | |
v.Insert(i3) | |
v.Insert(i2) | |
v.Insert(i1) | |
v.Insert(i0) | |
for i := 0; i < v.nelem; i++ { | |
var x *I | |
x = v.At(i).(*I) | |
r += fmt.Sprintln(i, x.val) // prints correct list | |
} | |
for i := 0; i < v.nelem; i++ { | |
r += fmt.Sprintln(i, v.At(i).(*I).val) | |
} | |
expect := `hi | |
0 44444 | |
1 3333 | |
2 222 | |
3 11 | |
4 0 | |
0 44444 | |
1 3333 | |
2 222 | |
3 11 | |
4 0 | |
` | |
if r != expect { | |
panic(r) | |
} | |
} | |
/* | |
bug027.go:50: illegal types for operand | |
(<Element>I{}) CONV (<I>{}) | |
bug027.go:50: illegal types for operand | |
(<Element>I{}) CONV (<I>{}) | |
*/ |