Enum lockfree::map::Preview

source · 
pub enum Preview<V> {
    Discard,
    Keep,
    New(V),
}
Expand description

The preview of an interactive insertion. It is used by the insert_with method and it is the return value of the closure passed to the method.

Variants

Discard

Tells the Map to discard the currently generated value. After this return value, the insertion is probably canceled and it fails. However, concurrent accesses to the Map may cause the conditions to be tested again.

Keep

Tells the Map to keep the currently generated value. If there was no generated value, this has the same effect as Preview::Discard.

New(V)

Tells the `Map to use this value instead of the previously generated (if any).

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.