mirror of
https://github.com/golang/go
synced 2024-11-24 19:00:13 -07:00
e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
47 lines
801 B
Go
47 lines
801 B
Go
// run
|
|
|
|
// 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.
|
|
|
|
// Test for declaration and use of a parameterized embedded field.
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
)
|
|
|
|
type MyStruct[T any] struct {
|
|
val T
|
|
}
|
|
|
|
type Lockable[T any] struct {
|
|
MyStruct[T]
|
|
mu sync.Mutex
|
|
}
|
|
|
|
// Get returns the value stored in a Lockable.
|
|
func (l *Lockable[T]) Get() T {
|
|
l.mu.Lock()
|
|
defer l.mu.Unlock()
|
|
return l.MyStruct.val
|
|
}
|
|
|
|
// Set sets the value in a Lockable.
|
|
func (l *Lockable[T]) Set(v T) {
|
|
l.mu.Lock()
|
|
defer l.mu.Unlock()
|
|
l.MyStruct = MyStruct[T]{v}
|
|
}
|
|
|
|
func main() {
|
|
var li Lockable[int]
|
|
|
|
li.Set(5)
|
|
if got, want := li.Get(), 5; got != want {
|
|
panic(fmt.Sprintf("got %d, want %d", got, want))
|
|
}
|
|
}
|