mirror of
https://github.com/golang/go
synced 2024-09-18 15:32:18 +00:00
61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
|
// run -gcflags=-G=3
|
||
|
|
||
|
// Copyright 2021 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.
|
||
|
|
||
|
// This test illustrates how a type bound method (String below) can be implemented
|
||
|
// either by a concrete type (myint below) or a instantiated generic type
|
||
|
// (StringInt[myint] below).
|
||
|
|
||
|
package main
|
||
|
|
||
|
import (
|
||
|
"fmt"
|
||
|
"reflect"
|
||
|
"strconv"
|
||
|
)
|
||
|
|
||
|
type myint int
|
||
|
|
||
|
//go:noinline
|
||
|
func (m myint) String() string {
|
||
|
return strconv.Itoa(int(m))
|
||
|
}
|
||
|
|
||
|
type Stringer interface {
|
||
|
String() string
|
||
|
}
|
||
|
|
||
|
func stringify[T Stringer](s []T) (ret []string) {
|
||
|
for _, v := range s {
|
||
|
ret = append(ret, v.String())
|
||
|
}
|
||
|
return ret
|
||
|
}
|
||
|
|
||
|
type StringInt[T any] T
|
||
|
|
||
|
//go:noinline
|
||
|
func (m StringInt[T]) String() string {
|
||
|
return "aa"
|
||
|
}
|
||
|
|
||
|
func main() {
|
||
|
x := []myint{myint(1), myint(2), myint(3)}
|
||
|
|
||
|
got := stringify(x)
|
||
|
want := []string{"1", "2", "3"}
|
||
|
if !reflect.DeepEqual(got, want) {
|
||
|
panic(fmt.Sprintf("got %s, want %s", got, want))
|
||
|
}
|
||
|
|
||
|
x2 := []StringInt[myint]{StringInt[myint](1), StringInt[myint](2), StringInt[myint](3)}
|
||
|
|
||
|
got2 := stringify(x2)
|
||
|
want2 := []string{"aa", "aa", "aa"}
|
||
|
if !reflect.DeepEqual(got2, want2) {
|
||
|
panic(fmt.Sprintf("got %s, want %s", got2, want2))
|
||
|
}
|
||
|
}
|