codekingpro/portable-devtools

1// run2 3// Copyright 2009 The Go Authors. All rights reserved.4// Use of this source code is governed by a BSD-style5// license that can be found in the LICENSE file.6 7// Test all the different interface conversion runtime functions.8 9package main10 11type Stringer interface {12	String() string13}14type StringLengther interface {15	String() string16	Length() int17}18type Empty interface{}19 20type T string21 22func (t T) String() string {23	return string(t)24}25func (t T) Length() int {26	return len(t)27}28 29type U string30 31func (u U) String() string {32	return string(u)33}34 35var t = T("hello")36var u = U("goodbye")37var e Empty38var s Stringer = t39var sl StringLengther = t40var i int41var ok bool42 43func hello(s string) {44	if s != "hello" {45		println("not hello: ", s)46		panic("fail")47	}48}49 50func five(i int) {51	if i != 5 {52		println("not 5: ", i)53		panic("fail")54	}55}56 57func true(ok bool) {58	if !ok {59		panic("not true")60	}61}62 63func false(ok bool) {64	if ok {65		panic("not false")66	}67}68 69func main() {70	// T2I71	s = t72	hello(s.String())73 74	// I2T75	t = s.(T)76	hello(t.String())77 78	// T2E79	e = t80 81	// E2T82	t = e.(T)83	hello(t.String())84 85	// T2I again86	sl = t87	hello(sl.String())88	five(sl.Length())89 90	// I2I static91	s = sl92	hello(s.String())93 94	// I2I dynamic95	sl = s.(StringLengther)96	hello(sl.String())97	five(sl.Length())98 99	// I2E (and E2T)100	e = s101	hello(e.(T).String())102 103	// E2I104	s = e.(Stringer)105	hello(s.String())106 107	// I2T2 true108	t, ok = s.(T)109	true(ok)110	hello(t.String())111 112	// I2T2 false113	_, ok = s.(U)114	false(ok)115 116	// I2I2 true117	sl, ok = s.(StringLengther)118	true(ok)119	hello(sl.String())120	five(sl.Length())121 122	// I2I2 false (and T2I)123	s = u124	sl, ok = s.(StringLengther)125	false(ok)126 127	// E2T2 true128	t, ok = e.(T)129	true(ok)130	hello(t.String())131 132	// E2T2 false133	i, ok = e.(int)134	false(ok)135 136	// E2I2 true137	sl, ok = e.(StringLengther)138	true(ok)139	hello(sl.String())140	five(sl.Length())141 142	// E2I2 false (and T2E)143	e = u144	sl, ok = e.(StringLengther)145	false(ok)146}147