mirror of https://github.com/minio/minio.git
67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
package pubsub
|
|
|
|
import (
|
|
"math"
|
|
"math/bits"
|
|
)
|
|
|
|
// Mask allows filtering by a bitset mask.
|
|
type Mask uint64
|
|
|
|
const (
|
|
// MaskAll is the mask for all entries.
|
|
MaskAll Mask = math.MaxUint64
|
|
)
|
|
|
|
// MaskFromMaskable extracts mask from an interface.
|
|
func MaskFromMaskable(m Maskable) Mask {
|
|
return Mask(m.Mask())
|
|
}
|
|
|
|
// Contains returns whether *all* flags in other is present in t.
|
|
func (t Mask) Contains(other Mask) bool {
|
|
return t&other == other
|
|
}
|
|
|
|
// Overlaps returns whether *any* flags in t overlaps with other.
|
|
func (t Mask) Overlaps(other Mask) bool {
|
|
return t&other != 0
|
|
}
|
|
|
|
// SingleType returns whether t has a single type set.
|
|
func (t Mask) SingleType() bool {
|
|
return bits.OnesCount64(uint64(t)) == 1
|
|
}
|
|
|
|
// FromUint64 will set a mask to the uint64 value.
|
|
func (t *Mask) FromUint64(m uint64) {
|
|
*t = Mask(m)
|
|
}
|
|
|
|
// Merge will merge other into t.
|
|
func (t *Mask) Merge(other Mask) {
|
|
*t |= other
|
|
}
|
|
|
|
// MergeMaskable will merge other into t.
|
|
func (t *Mask) MergeMaskable(other Maskable) {
|
|
*t |= Mask(other.Mask())
|
|
}
|
|
|
|
// SetIf will add other if b is true.
|
|
func (t *Mask) SetIf(b bool, other Mask) {
|
|
if b {
|
|
*t |= other
|
|
}
|
|
}
|
|
|
|
// Mask returns the mask as a uint64.
|
|
func (t Mask) Mask() uint64 {
|
|
return uint64(t)
|
|
}
|
|
|
|
// Maskable implementations must return their mask as a 64 bit uint.
|
|
type Maskable interface {
|
|
Mask() uint64
|
|
}
|