mirror of
https://github.com/golang/go
synced 2024-11-17 21:04:43 -07:00
640a49b8d4
Make sure that an embedded field like "MyStruct[T]" works and can be referenced via the name MyStruct. Change-Id: I8be1f1184dd42c4e54e4144aff2fd85e30af722f Reviewed-on: https://go-review.googlesource.com/c/go/+/356312 Trust: Dan Scales <danscales@google.com> Reviewed-by: Robert Griesemer <gri@golang.org>
47 lines
815 B
Go
47 lines
815 B
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.
|
|
|
|
// 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))
|
|
}
|
|
}
|