Trait ccache::hashmap::user::Meta[−][src]

pub trait Meta<V>: Default {
    fn new() -> Self
    where
        Self: Sized;

    fn on_insert(
        &mut self, 
        current_val: &mut V, 
        old_entry: Option<(&Self, &mut V)>
    );

    fn on_get(&mut self, val: &mut V);
}

The trait UserMeta defines operations that will be run on certain operations of the LRU

Required methods

fn new() -> Self where
    Self: Sized, [src]

create a new metadata struct with default values used if you don’t want to specify one on insert(…)

fn on_insert(&mut self, current_val: &mut V, old_entry: Option<(&Self, &mut V)>)[src]

run every time the key is added or re-added as extra parameters you have:

  • old_meta: ref to the old metadata. used when you are re-adding the same key, so that you can decide if you want to keep the old meta or start anew
  • val: if somehow you need to modify the value every time we have an access

fn on_get(&mut self, val: &mut V)[src]

run every time the key is requested

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Implementors

impl<V> Meta<V> for ZeroMeta[src]

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