diff options
Diffstat (limited to 'pkg/com/atomic.go')
-rw-r--r-- | pkg/com/atomic.go | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/pkg/com/atomic.go b/pkg/com/atomic.go new file mode 100644 index 0000000..316413d --- /dev/null +++ b/pkg/com/atomic.go @@ -0,0 +1,38 @@ +package com + +import "sync/atomic" + +// Atomic is a type-safe wrapper around atomic.Value. +type Atomic[T any] struct { + v atomic.Value +} + +func (a *Atomic[T]) Load() (_ T, ok bool) { + if v, ok := a.v.Load().(box[T]); ok { + return v.v, true + } + + return +} + +func (a *Atomic[T]) Store(v T) { + a.v.Store(box[T]{v}) +} + +func (a *Atomic[T]) Swap(new T) (old T, ok bool) { + if old, ok := a.v.Swap(box[T]{new}).(box[T]); ok { + return old.v, true + } + + return +} + +func (a *Atomic[T]) CompareAndSwap(old, new T) (swapped bool) { + return a.v.CompareAndSwap(box[T]{old}, box[T]{new}) +} + +// box allows, for the case T is an interface, nil values and values of different specific types implementing T +// to be stored in Atomic[T]#v (bypassing atomic.Value#Store()'s policy) by wrapping it (into a non-interface). +type box[T any] struct { + v T +} |