[−][src]Struct exonum_merkledb::indexes::SparseListIndex
A list of items similar to ListIndex
; however, it may contain "spaces". For instance,
a list might contain six elements with indexes: 1, 2, 3, 5, 7, 8
(missing 4 and 6). And if you
try to get the element for index 4 or 6, you will get None
.
Later, elements can be added to the spaces, if required. Elements in this list are added to the end of the list and are removed either from the end of the list or from certain indexes.
SparseListIndex
has length and capacity. Length is the number of non-empty
elements in the list. Capacity is the number of all elements in the list, both
empty and non-empty.
SparseListIndex
implements an array list, storing an element as a value and using u64
as an index.
SparseListIndex
requires that elements should implement the BinaryValue
trait.
Methods
impl<T, V> SparseListIndex<T, V> where
T: RawAccess,
V: BinaryValue,
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T: RawAccess,
V: BinaryValue,
pub fn get(&self, index: u64) -> Option<V>
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Returns an element at the indicated position or None
if the indicated
position is out of bounds or if it does not exist.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let fork = db.fork(); let mut index = fork.get_sparse_list("name"); assert_eq!(None, index.get(0)); index.push(42); assert_eq!(Some(42), index.get(0)); index.push(1); index.remove(0); assert_eq!(None, index.get(0)); assert_eq!(Some(1), index.get(1));
pub fn is_empty(&self) -> bool
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Returns true
if the list contains no elements.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let fork = db.fork(); let mut index = fork.get_sparse_list("name"); assert!(index.is_empty()); index.push(42); assert!(!index.is_empty());
pub fn capacity(&self) -> u64
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Returns the total amount of elements, including empty elements, in the list. The value of capacity is determined by the maximum index of an element ever inserted into the given index.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let fork = db.fork(); let mut index = fork.get_sparse_list("name"); assert_eq!(0, index.capacity()); index.push(10); index.push(12); assert_eq!(2, index.capacity()); index.remove(0); index.push(100); assert_eq!(3, index.capacity());
pub fn len(&self) -> u64
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Returns the total amount of non-empty elements in the list.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let fork = db.fork(); let mut index = fork.get_sparse_list("name"); assert_eq!(0, index.len()); index.push(10); assert_eq!(1, index.len()); index.remove(0); index.push(100); assert_eq!(1, index.len());
pub fn iter(&self) -> Entries<u64, V>
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Returns an iterator over the list elements with corresponding indexes.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let fork = db.fork(); let mut index = fork.get_sparse_list("name"); index.extend([1, 2, 3, 4, 5].iter().cloned()); for val in index.iter() { println!("{:?}", val); }
pub fn indexes(&self) -> Keys<u64>
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Returns an iterator over the indexes of the SparseListIndex
.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); index.extend([1, 2, 3, 4, 5].iter().cloned()); for val in index.indexes() { println!("{}", val); }
pub fn values(&self) -> Values<V>
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Returns an iterator over list elements.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); index.extend([1, 2, 3, 4, 5].iter().cloned()); for val in index.values() { println!("{}", val); }
pub fn iter_from(&self, from: u64) -> Entries<u64, V>
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Returns an iterator over the list elements starting from the specified position. Elements are yielded with the corresponding index.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); index.extend([1, 2, 3, 4, 5].iter().cloned()); index.remove(3); for val in index.iter_from(3) { println!("{:?}", val); }
impl<T, V> SparseListIndex<T, V> where
T: RawAccessMut,
V: BinaryValue,
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T: RawAccessMut,
V: BinaryValue,
pub fn push(&mut self, value: V)
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Appends an element to the back of the SparseListIndex
.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); index.push(1); assert!(!index.is_empty());
pub fn remove(&mut self, index: u64) -> Option<V>
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Removes the element with the given index from the list and returns it,
or returns None
if it is empty.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); assert_eq!(0, index.capacity()); index.push(10); index.push(12); assert_eq!(Some(10), index.remove(0)); assert_eq!(None, index.remove(0)); assert_eq!(2, index.capacity()); assert_eq!(1, index.len()); assert_eq!(Some(12), index.remove(1)); assert_eq!(2, index.capacity());
pub fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = V>,
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I: IntoIterator<Item = V>,
Extends the list with the contents of an iterator.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); assert!(index.is_empty()); index.extend([1, 2, 3].iter().cloned()); assert_eq!(3, index.capacity());
pub fn set(&mut self, index: u64, value: V) -> Option<V>
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Changes a value at a specified position. If the position contains an empty value, it also increments the elements count. If the index value of the new element is greater than the current capacity, the capacity of the list is considered index + 1 and all further elements without specific index values will be appended after this index.
Returns the value of a previous element at the indicated position or None
if it is empty.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); index.push(1); assert_eq!(Some(1), index.get(0)); index.set(0, 10); assert_eq!(Some(10), index.get(0));
pub fn clear(&mut self)
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Clears the list, removing all values.
Notes
Currently, this method is not optimized to delete a large set of data. During the execution of this method, the amount of allocated memory is linearly dependent on the number of elements in the index.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); index.push(1); assert!(!index.is_empty()); index.clear(); assert!(index.is_empty());
pub fn pop(&mut self) -> Option<V>
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Removes the first element from the SparseListIndex
and returns it, or
returns None
if it is empty.
Examples
use exonum_merkledb::{access::CopyAccessExt, TemporaryDB, Database, SparseListIndex}; let db = TemporaryDB::new(); let mut fork = db.fork(); let mut index = fork.get_sparse_list("name"); assert_eq!(None, index.pop()); index.push(1); assert_eq!(Some(1), index.pop());
Trait Implementations
impl<T: Debug + RawAccess, V: Debug> Debug for SparseListIndex<T, V>
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impl<T, V> FromAccess<T> for SparseListIndex<T::Base, V> where
T: Access,
V: BinaryValue,
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T: Access,
V: BinaryValue,
fn from_access(access: T, addr: IndexAddress) -> Result<Self, AccessError>
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fn from_root(access: T) -> Result<Self, AccessError>
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impl<T, V> IndexIterator for SparseListIndex<T, V> where
T: RawAccess,
V: BinaryValue,
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T: RawAccess,
V: BinaryValue,
type Key = u64
Type encompassing index keys.
type Value = V
Type encompassing index values.
fn index_iter(&self, from: Option<&u64>) -> Entries<u64, V>
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impl<'a, T, V> IntoIterator for &'a SparseListIndex<T, V> where
T: RawAccess,
V: BinaryValue,
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T: RawAccess,
V: BinaryValue,
Auto Trait Implementations
impl<T, V> RefUnwindSafe for SparseListIndex<T, V> where
T: RefUnwindSafe,
V: RefUnwindSafe,
<T as RawAccess>::Changes: RefUnwindSafe,
T: RefUnwindSafe,
V: RefUnwindSafe,
<T as RawAccess>::Changes: RefUnwindSafe,
impl<T, V> Send for SparseListIndex<T, V> where
T: Send,
V: Send,
<T as RawAccess>::Changes: Send,
T: Send,
V: Send,
<T as RawAccess>::Changes: Send,
impl<T, V> Sync for SparseListIndex<T, V> where
T: Sync,
V: Sync,
<T as RawAccess>::Changes: Sync,
T: Sync,
V: Sync,
<T as RawAccess>::Changes: Sync,
impl<T, V> Unpin for SparseListIndex<T, V> where
T: Unpin,
V: Unpin,
<T as RawAccess>::Changes: Unpin,
T: Unpin,
V: Unpin,
<T as RawAccess>::Changes: Unpin,
impl<T, V> UnwindSafe for SparseListIndex<T, V> where
T: UnwindSafe,
V: UnwindSafe,
<T as RawAccess>::Changes: UnwindSafe,
T: UnwindSafe,
V: UnwindSafe,
<T as RawAccess>::Changes: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,