Enum Cond 

pub enum Cond {
    None,
    CreateOnly,
    IfGeneration(u64),
}

A write precondition.

Variants

None

Write unconditionally (replace whatever is there).

CreateOnly

Write only if no object exists under the key (Error::Conflict otherwise).

IfGeneration(u64)

Write only if the object is at exactly this generation (Error::PreconditionFailed otherwise, including when it does not exist).

Trait Implementations

impl Clone for Cond

fn clone(&self) -> Self

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() -> Self

Returns the “default value” for a type.

impl Eq for Cond

impl PartialEq for Cond

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Cond