Enum Cond 

pub enum Cond {
    Always,
    NotSet,
    AlreadySet,
    Greater,
    Less,
    LessAndSet,
}

The condition on a deadline being set, which is NX, XX, GT or LT.

A hash field command takes exactly one of the four keywords. EXPIRE on a whole key takes a set of them and accepts two, XX GT and XX LT, which is where Cond::LessAndSet comes from. XX GT is not a sixth case because GT already refuses a key with no deadline, so it means the same thing as GT alone.

Variants

Always

No condition. Set it whatever was there.

NotSet

Only if the field has no deadline now.

AlreadySet

Only if the field has one now.

Greater

Only if it moves the deadline later, or there was none.

Less

Only if it moves the deadline earlier, or there was none.

LessAndSet

Only if there is one now and this moves it earlier.

XX LT on a key. It is a separate case because LT on its own accepts a key with no deadline, on the reading that no deadline is infinitely far away, and XX is what takes that reading away.

Trait Implementations

impl Clone for Cond

fn clone(&self) -> Cond

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Cond

impl Debug for Cond

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Cond

fn default() -> Cond

Returns the “default value” for a type.

impl Eq for Cond

impl PartialEq for Cond

fn eq(&self, other: &Cond) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Cond