| Server IP : 91.108.119.75 / Your IP : 216.73.216.217 Web Server : LiteSpeed System : Linux id-dci-web1986.main-hosting.eu 5.14.0-611.26.1.el9_7.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Jan 29 05:24:47 EST 2026 x86_64 User : u686484674 ( 686484674) PHP Version : 8.0.30 Disable Function : system, exec, shell_exec, passthru, mysql_list_dbs, ini_alter, dl, symlink, link, chgrp, leak, popen, apache_child_terminate, virtual, mb_send_mail MySQL : OFF | cURL : ON | WGET : ON | Perl : OFF | Python : OFF | Sudo : OFF | Pkexec : OFF Directory : /proc/self/root/opt/golang/1.22.0/test/interface/ |
Upload File : |
// 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 all the different interface conversion runtime functions.
package main
type Stringer interface {
String() string
}
type StringLengther interface {
String() string
Length() int
}
type Empty interface{}
type T string
func (t T) String() string {
return string(t)
}
func (t T) Length() int {
return len(t)
}
type U string
func (u U) String() string {
return string(u)
}
var t = T("hello")
var u = U("goodbye")
var e Empty
var s Stringer = t
var sl StringLengther = t
var i int
var ok bool
func hello(s string) {
if s != "hello" {
println("not hello: ", s)
panic("fail")
}
}
func five(i int) {
if i != 5 {
println("not 5: ", i)
panic("fail")
}
}
func true(ok bool) {
if !ok {
panic("not true")
}
}
func false(ok bool) {
if ok {
panic("not false")
}
}
func main() {
// T2I
s = t
hello(s.String())
// I2T
t = s.(T)
hello(t.String())
// T2E
e = t
// E2T
t = e.(T)
hello(t.String())
// T2I again
sl = t
hello(sl.String())
five(sl.Length())
// I2I static
s = sl
hello(s.String())
// I2I dynamic
sl = s.(StringLengther)
hello(sl.String())
five(sl.Length())
// I2E (and E2T)
e = s
hello(e.(T).String())
// E2I
s = e.(Stringer)
hello(s.String())
// I2T2 true
t, ok = s.(T)
true(ok)
hello(t.String())
// I2T2 false
_, ok = s.(U)
false(ok)
// I2I2 true
sl, ok = s.(StringLengther)
true(ok)
hello(sl.String())
five(sl.Length())
// I2I2 false (and T2I)
s = u
sl, ok = s.(StringLengther)
false(ok)
// E2T2 true
t, ok = e.(T)
true(ok)
hello(t.String())
// E2T2 false
i, ok = e.(int)
false(ok)
// E2I2 true
sl, ok = e.(StringLengther)
true(ok)
hello(sl.String())
five(sl.Length())
// E2I2 false (and T2E)
e = u
sl, ok = e.(StringLengther)
false(ok)
}