pub trait Cursor {
type Key<'a>: Copy + Clone + MyTrait<'a, Owned = Self::KeyOwned>;
type KeyOwned: Ord + Clone;
type Val<'a>: Copy + Clone + MyTrait<'a, Owned = Self::ValOwned> + for<'b> PartialOrd<Self::Val<'b>>;
type ValOwned: Ord + Clone;
type Time;
type Diff: ?Sized;
type Storage;
Show 15 methods
// Required methods
fn key_valid(&self, storage: &Self::Storage) -> bool;
fn val_valid(&self, storage: &Self::Storage) -> bool;
fn key<'a>(&self, storage: &'a Self::Storage) -> Self::Key<'a>;
fn val<'a>(&self, storage: &'a Self::Storage) -> Self::Val<'a>;
fn map_times<L: FnMut(&Self::Time, &Self::Diff)>(
&mut self,
storage: &Self::Storage,
logic: L,
);
fn step_key(&mut self, storage: &Self::Storage);
fn seek_key(&mut self, storage: &Self::Storage, key: Self::Key<'_>);
fn step_val(&mut self, storage: &Self::Storage);
fn seek_val(&mut self, storage: &Self::Storage, val: Self::Val<'_>);
fn rewind_keys(&mut self, storage: &Self::Storage);
fn rewind_vals(&mut self, storage: &Self::Storage);
// Provided methods
fn get_key<'a>(&self, storage: &'a Self::Storage) -> Option<Self::Key<'a>> { ... }
fn get_val<'a>(&self, storage: &'a Self::Storage) -> Option<Self::Val<'a>> { ... }
fn seek_key_owned(&mut self, storage: &Self::Storage, key: &Self::KeyOwned) { ... }
fn to_vec(
&mut self,
storage: &Self::Storage,
) -> Vec<((Self::KeyOwned, Self::ValOwned), Vec<(Self::Time, Self::Diff)>)>
where Self::Time: Clone,
Self::Diff: Clone { ... }
}Expand description
A cursor for navigating ordered (key, val, time, diff) updates.
Required Associated Types§
Sourcetype Key<'a>: Copy + Clone + MyTrait<'a, Owned = Self::KeyOwned>
type Key<'a>: Copy + Clone + MyTrait<'a, Owned = Self::KeyOwned>
Key by which updates are indexed.
Required Methods§
Sourcefn key_valid(&self, storage: &Self::Storage) -> bool
fn key_valid(&self, storage: &Self::Storage) -> bool
Indicates if the current key is valid.
A value of false indicates that the cursor has exhausted all keys.
Sourcefn val_valid(&self, storage: &Self::Storage) -> bool
fn val_valid(&self, storage: &Self::Storage) -> bool
Indicates if the current value is valid.
A value of false indicates that the cursor has exhausted all values for this key.
Sourcefn key<'a>(&self, storage: &'a Self::Storage) -> Self::Key<'a>
fn key<'a>(&self, storage: &'a Self::Storage) -> Self::Key<'a>
A reference to the current key. Asserts if invalid.
Sourcefn val<'a>(&self, storage: &'a Self::Storage) -> Self::Val<'a>
fn val<'a>(&self, storage: &'a Self::Storage) -> Self::Val<'a>
A reference to the current value. Asserts if invalid.
Sourcefn map_times<L: FnMut(&Self::Time, &Self::Diff)>(
&mut self,
storage: &Self::Storage,
logic: L,
)
fn map_times<L: FnMut(&Self::Time, &Self::Diff)>( &mut self, storage: &Self::Storage, logic: L, )
Applies logic to each pair of time and difference. Intended for mutation of the
closure’s scope.
Sourcefn seek_key(&mut self, storage: &Self::Storage, key: Self::Key<'_>)
fn seek_key(&mut self, storage: &Self::Storage, key: Self::Key<'_>)
Advances the cursor to the specified key.
Sourcefn seek_val(&mut self, storage: &Self::Storage, val: Self::Val<'_>)
fn seek_val(&mut self, storage: &Self::Storage, val: Self::Val<'_>)
Advances the cursor to the specified value.
Sourcefn rewind_keys(&mut self, storage: &Self::Storage)
fn rewind_keys(&mut self, storage: &Self::Storage)
Rewinds the cursor to the first key.
Sourcefn rewind_vals(&mut self, storage: &Self::Storage)
fn rewind_vals(&mut self, storage: &Self::Storage)
Rewinds the cursor to the first value for current key.
Provided Methods§
Sourcefn get_key<'a>(&self, storage: &'a Self::Storage) -> Option<Self::Key<'a>>
fn get_key<'a>(&self, storage: &'a Self::Storage) -> Option<Self::Key<'a>>
Returns a reference to the current key, if valid.
Sourcefn get_val<'a>(&self, storage: &'a Self::Storage) -> Option<Self::Val<'a>>
fn get_val<'a>(&self, storage: &'a Self::Storage) -> Option<Self::Val<'a>>
Returns a reference to the current value, if valid.
Sourcefn seek_key_owned(&mut self, storage: &Self::Storage, key: &Self::KeyOwned)
fn seek_key_owned(&mut self, storage: &Self::Storage, key: &Self::KeyOwned)
Convenience method to get access by reference to an owned key.
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety".