| // Copyright (c) 2022 Uber Technologies, Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| //go:build go1.19 |
| // +build go1.19 |
| |
| package atomic |
| |
| import "sync/atomic" |
| |
| // Pointer is an atomic pointer of type *T. |
| type Pointer[T any] struct { |
| _ nocmp // disallow non-atomic comparison |
| p atomic.Pointer[T] |
| } |
| |
| // NewPointer creates a new Pointer. |
| func NewPointer[T any](v *T) *Pointer[T] { |
| var p Pointer[T] |
| if v != nil { |
| p.p.Store(v) |
| } |
| return &p |
| } |
| |
| // Load atomically loads the wrapped value. |
| func (p *Pointer[T]) Load() *T { |
| return p.p.Load() |
| } |
| |
| // Store atomically stores the passed value. |
| func (p *Pointer[T]) Store(val *T) { |
| p.p.Store(val) |
| } |
| |
| // Swap atomically swaps the wrapped pointer and returns the old value. |
| func (p *Pointer[T]) Swap(val *T) (old *T) { |
| return p.p.Swap(val) |
| } |
| |
| // CompareAndSwap is an atomic compare-and-swap. |
| func (p *Pointer[T]) CompareAndSwap(old, new *T) (swapped bool) { |
| return p.p.CompareAndSwap(old, new) |
| } |