Struct differential_dataflow::trace::wrappers::freeze::CursorFreeze
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pub struct CursorFreeze<K, V, T, R, C: Cursor<K, V, T, R>, F> { /* fields omitted */ }
Wrapper to provide cursor to nested scope.
Trait Implementations
impl<K, V, T, R, C, F> Cursor<K, V, T, R> for CursorFreeze<K, V, T, R, C, F> where
C: Cursor<K, V, T, R>,
F: Fn(&T) -> Option<T>,
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C: Cursor<K, V, T, R>,
F: Fn(&T) -> Option<T>,
type Storage = C::Storage
Type the cursor addresses data in.
fn key_valid(&self, storage: &Self::Storage) -> bool
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Indicates if the current key is valid. Read more
fn val_valid(&self, storage: &Self::Storage) -> bool
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Indicates if the current value is valid. Read more
fn key<'a>(&self, storage: &'a Self::Storage) -> &'a K
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A reference to the current key. Asserts if invalid.
fn val<'a>(&self, storage: &'a Self::Storage) -> &'a V
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A reference to the current value. Asserts if invalid.
fn map_times<L: FnMut(&T, R)>(&mut self, storage: &Self::Storage, logic: L)
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Applies logic
to each pair of time and difference. Intended for mutation of the closure's scope. Read more
fn step_key(&mut self, storage: &Self::Storage)
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Advances the cursor to the next key. Indicates if the key is valid.
fn seek_key(&mut self, storage: &Self::Storage, key: &K)
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Advances the cursor to the specified key. Indicates if the key is valid.
fn step_val(&mut self, storage: &Self::Storage)
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Advances the cursor to the next value. Indicates if the value is valid.
fn seek_val(&mut self, storage: &Self::Storage, val: &V)
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Advances the cursor to the specified value. Indicates if the value is valid.
fn rewind_keys(&mut self, storage: &Self::Storage)
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Rewinds the cursor to the first key.
fn rewind_vals(&mut self, storage: &Self::Storage)
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Rewinds the cursor to the first value for current key.
fn get_key<'a>(&self, storage: &'a Self::Storage) -> Option<&'a K>
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Returns a reference to the current key, if valid.
fn get_val<'a>(&self, storage: &'a Self::Storage) -> Option<&'a V>
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Returns a reference to the current value, if valid.