map_go120.go

//go:build go1.20

package synx

// Swap swaps the value for a key and returns the previous value if any.
// The loaded result reports whether the key was present.
func (m *Map[K, V]) Swap(key K, value V) (previous V, loaded bool) {
	v, ok := m.m.Swap(key, value)
	if v != nil {
		previous = v.(V)
	}
	return previous, ok
}

// CompareAndSwap swaps the old and new values for key
// if the value stored in the map is equal to old.
// The old value must be of a comparable type.
func (m *Map[K, V]) CompareAndSwap(key K, old, new V) bool {
	return m.m.CompareAndSwap(key, old, new)
}

// CompareAndDelete deletes the entry for key if its value is equal to old.
// The old value must be of a comparable type.
//
// If there is no current value for key in the map, CompareAndDelete
// returns false (even if the old value is the nil interface value).
func (m *Map[K, V]) CompareAndDelete(key K, old V) (deleted bool) {
	return m.m.CompareAndDelete(key, old)
}