// 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. package a import ( "fmt" "sync" ) type WrapperWithLock[T any] interface { PrintWithLock() } func NewWrapperWithLock[T any](value T) WrapperWithLock[T] { return &wrapperWithLock[T]{ Object: value, } } type wrapperWithLock[T any] struct { Lock sync.Mutex Object T } func (w *wrapperWithLock[T]) PrintWithLock() { w.Lock.Lock() defer w.Lock.Unlock() fmt.Println(w.Object) }