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      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 interface values containing structures.
      8 
      9 package main
     10 
     11 import "os"
     12 
     13 var fail int
     14 
     15 func check(b bool, msg string) {
     16 	if (!b) {
     17 		println("failure in", msg)
     18 		fail++
     19 	}
     20 }
     21 
     22 type I1 interface { Get() int; Put(int) }
     23 
     24 type S1 struct { i int }
     25 func (p S1) Get() int { return p.i }
     26 func (p S1) Put(i int) { p.i = i }
     27 
     28 func f1() {
     29 	s := S1{1}
     30 	var i I1 = s
     31 	i.Put(2)
     32 	check(i.Get() == 1, "f1 i")
     33 	check(s.i == 1, "f1 s")
     34 }
     35 
     36 func f2() {
     37 	s := S1{1}
     38 	var i I1 = &s
     39 	i.Put(2)
     40 	check(i.Get() == 1, "f2 i")
     41 	check(s.i == 1, "f2 s")
     42 }
     43 
     44 func f3() {
     45 	s := &S1{1}
     46 	var i I1 = s
     47 	i.Put(2)
     48 	check(i.Get() == 1, "f3 i")
     49 	check(s.i == 1, "f3 s")
     50 }
     51 
     52 type S2 struct { i int }
     53 func (p *S2) Get() int { return p.i }
     54 func (p *S2) Put(i int) { p.i = i }
     55 
     56 // Disallowed by restriction of values going to pointer receivers
     57 // func f4() {
     58 //	 s := S2{1}
     59 //	 var i I1 = s
     60 //	 i.Put(2)
     61 //	 check(i.Get() == 2, "f4 i")
     62 //	 check(s.i == 1, "f4 s")
     63 // }
     64 
     65 func f5() {
     66 	s := S2{1}
     67 	var i I1 = &s
     68 	i.Put(2)
     69 	check(i.Get() == 2, "f5 i")
     70 	check(s.i == 2, "f5 s")
     71 }
     72 
     73 func f6() {
     74 	s := &S2{1}
     75 	var i I1 = s
     76 	i.Put(2)
     77 	check(i.Get() == 2, "f6 i")
     78 	check(s.i == 2, "f6 s")
     79 }
     80 
     81 type I2 interface { Get() int64; Put(int64) }
     82 
     83 type S3 struct { i, j, k, l int64 }
     84 func (p S3) Get() int64 { return p.l }
     85 func (p S3) Put(i int64) { p.l = i }
     86 
     87 func f7() {
     88 	s := S3{1, 2, 3, 4}
     89 	var i I2 = s
     90 	i.Put(5)
     91 	check(i.Get() == 4, "f7 i")
     92 	check(s.l == 4, "f7 s")
     93 }
     94 
     95 func f8() {
     96 	s := S3{1, 2, 3, 4}
     97 	var i I2 = &s
     98 	i.Put(5)
     99 	check(i.Get() == 4, "f8 i")
    100 	check(s.l == 4, "f8 s")
    101 }
    102 
    103 func f9() {
    104 	s := &S3{1, 2, 3, 4}
    105 	var i I2 = s
    106 	i.Put(5)
    107 	check(i.Get() == 4, "f9 i")
    108 	check(s.l == 4, "f9 s")
    109 }
    110 
    111 type S4 struct { i, j, k, l int64 }
    112 func (p *S4) Get() int64 { return p.l }
    113 func (p *S4) Put(i int64) { p.l = i }
    114 
    115 // Disallowed by restriction of values going to pointer receivers
    116 // func f10() {
    117 //	 s := S4{1, 2, 3, 4}
    118 //	 var i I2 = s
    119 //	 i.Put(5)
    120 //	 check(i.Get() == 5, "f10 i")
    121 //	 check(s.l == 4, "f10 s")
    122 // }
    123 
    124 func f11() {
    125 	s := S4{1, 2, 3, 4}
    126 	var i I2 = &s
    127 	i.Put(5)
    128 	check(i.Get() == 5, "f11 i")
    129 	check(s.l == 5, "f11 s")
    130 }
    131 
    132 func f12() {
    133 	s := &S4{1, 2, 3, 4}
    134 	var i I2 = s
    135 	i.Put(5)
    136 	check(i.Get() == 5, "f12 i")
    137 	check(s.l == 5, "f12 s")
    138 }
    139 
    140 func main() {
    141 	f1()
    142 	f2()
    143 	f3()
    144 //	f4()
    145 	f5()
    146 	f6()
    147 	f7()
    148 	f8()
    149 	f9()
    150 //	f10()
    151 	f11()
    152 	f12()
    153 	if fail > 0 {
    154 		os.Exit(1)
    155 	}
    156 }
    157