67vc33-b1a78eb8b39a7a2f.ithost.pongsawadi.ac.th

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/usr/share/go-1.22/test/interface/

Edit File: convert.go

// 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)
}

Cancel

Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
assertinline.go	1.77 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
bigdata.go	1.45 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
convert.go	1.88 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
convert1.go	393 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
convert2.go	393 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
embed.go	924 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
embed1.dir	DIR	29.06.2025 20:01:27	0/0	drwxr-xr-x	Edit Rename
embed1.go	250 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
embed2.go	1.48 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
embed3.dir	DIR	29.06.2025 20:01:27	0/0	drwxr-xr-x	Edit Rename
embed3.go	187 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
explicit.go	1.96 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
fail.go	544 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
fake.go	1.75 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
noeq.go	641 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
pointer.go	758 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
private.dir	DIR	29.06.2025 20:01:27	0/0	drwxr-xr-x	Edit Rename
private.go	285 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
receiver.go	1.26 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
receiver1.go	790 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
recursive.go	374 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
recursive1.dir	DIR	29.06.2025 20:01:27	0/0	drwxr-xr-x	Edit Rename
recursive1.go	267 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
returntype.go	670 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
struct.go	2.43 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download

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