golang interfun 代码
文件路径：/test/ken/interfun.go
/ 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.
/ Test interfaces and methods.
package main
type S struct {
a,b int;
}
type I1 interface {
f ()int;
}
type I2 interface {
g() int;
f() int;
}
func (this *S) f()int {
return this.a;
}
func (this *S) g()int {
return this.b;
}
func
main() {
var i1 I1;
var i2 I2;
var g *S;
s := new(S);
s.a = 5;
s.b = 6;
/ call structure
if s.f() != 5 { panic(11); }
if s.g() != 6 { panic(12); }
i1 = s; / convert S to I1
i2 = i1.(I2); / convert I1 to I2
/ call interface
if i1.f() != 5 { panic(21); }
if i2.f() != 5 { panic(22); }
if i2.g() != 6 { panic(23); }
g = i1.(*S); / convert I1 to S
if g != s { panic(31); }
g = i2.(*S); / convert I2 to S
if g != s { panic(32); }
}