gcc/testsuite/go.test/test/ken/interfun.go

   1 // $G $D/$F.go && $L $F.$A && ./$A.out
   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 package main
   8
   9 type S struct {
  10         a,b     int;
  11 }
  12
  13 type I1 interface {
  14         f       ()int;
  15 }
  16
  17 type I2 interface {
  18         g() int;
  19         f() int;
  20 }
  21
  22 func (this *S) f()int {
  23         return this.a;
  24 }
  25
  26 func (this *S) g()int {
  27         return this.b;
  28 }
  29
  30 func
  31 main() {
  32         var i1 I1;
  33         var i2 I2;
  34         var g *S;
  35
  36         s := new(S);
  37         s.a = 5;
  38         s.b = 6;
  39
  40         // call structure
  41         if s.f() != 5 { panic(11); }
  42         if s.g() != 6 { panic(12); }
  43
  44         i1 = s;         // convert S to I1
  45         i2 = i1.(I2);   // convert I1 to I2
  46
  47         // call interface
  48         if i1.f() != 5 { panic(21); }
  49         if i2.f() != 5 { panic(22); }
  50         if i2.g() != 6 { panic(23); }
  51
  52         g = i1.(*S);            // convert I1 to S
  53         if g != s { panic(31); }
  54
  55         g = i2.(*S);            // convert I2 to S
  56         if g != s { panic(32); }
  57 }