1 // run 2 3 // Copyright 2009 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Test interfaces and methods. 8 9 package main 10 11 type S struct { 12 a,b int; 13 } 14 15 type I1 interface { 16 f ()int; 17 } 18 19 type I2 interface { 20 g() int; 21 f() int; 22 } 23 24 func (this *S) f()int { 25 return this.a; 26 } 27 28 func (this *S) g()int { 29 return this.b; 30 } 31 32 func 33 main() { 34 var i1 I1; 35 var i2 I2; 36 var g *S; 37 38 s := new(S); 39 s.a = 5; 40 s.b = 6; 41 42 // call structure 43 if s.f() != 5 { panic(11); } 44 if s.g() != 6 { panic(12); } 45 46 i1 = s; // convert S to I1 47 i2 = i1.(I2); // convert I1 to I2 48 49 // call interface 50 if i1.f() != 5 { panic(21); } 51 if i2.f() != 5 { panic(22); } 52 if i2.g() != 6 { panic(23); } 53 54 g = i1.(*S); // convert I1 to S 55 if g != s { panic(31); } 56 57 g = i2.(*S); // convert I2 to S 58 if g != s { panic(32); } 59 } 60
