Struct common_types::state_diff::StateDiff

pub struct StateDiff {
    pub raw: BTreeMap<Address, AccountDiff>,
}

Expression for the delta between two system states. Encoded the delta of every altered account.

Fields

raw: BTreeMap<Address, AccountDiff>

Raw diff key-value

Methods

impl StateDiff

pub fn get(&self) -> &BTreeMap<Address, AccountDiff>

Get the actual data.

Methods from Deref<Target = BTreeMap<Address, AccountDiff>>

pub fn get<Q>(&self, key: &Q) -> Option<&V> where     K: Borrow<Q>,     Q: Ord + ?Sized,

Returns a reference to the value corresponding to the key.

The key may be any borrowed form of the map's key type, but the ordering on the borrowed form must match the ordering on the key type.

Examples

Basic usage:

use std::collections::BTreeMap;

let mut map = BTreeMap::new();
map.insert(1, "a");
assert_eq!(map.get(&1), Some(&"a"));
assert_eq!(map.get(&2), None);

pub fn get_key_value<Q>(&self, k: &Q) -> Option<(&K, &V)> where     K: Borrow<Q>,     Q: Ord + ?Sized,

🔬 This is a nightly-only experimental API. (map_get_key_value)

Returns the key-value pair corresponding to the supplied key.

The supplied key may be any borrowed form of the map's key type, but the ordering on the borrowed form must match the ordering on the key type.

Examples

#![feature(map_get_key_value)]
use std::collections::BTreeMap;

let mut map = BTreeMap::new();
map.insert(1, "a");
assert_eq!(map.get_key_value(&1), Some((&1, &"a")));
assert_eq!(map.get_key_value(&2), None);

pub fn contains_key<Q>(&self, key: &Q) -> bool where     K: Borrow<Q>,     Q: Ord + ?Sized,

Returns true if the map contains a value for the specified key.

The key may be any borrowed form of the map's key type, but the ordering on the borrowed form must match the ordering on the key type.

Examples

Basic usage:

use std::collections::BTreeMap;

let mut map = BTreeMap::new();
map.insert(1, "a");
assert_eq!(map.contains_key(&1), true);
assert_eq!(map.contains_key(&2), false);

Important traits for Range<'a, K, V>

impl<'a, K, V> Iterator for Range<'a, K, V> type Item = (&'a K, &'a V);

pub fn range<T, R>(&self, range: R) -> Range<K, V> where     K: Borrow<T>,     R: RangeBounds<T>,     T: Ord + ?Sized,

Constructs a double-ended iterator over a sub-range of elements in the map. The simplest way is to use the range syntax min..max, thus range(min..max) will yield elements from min (inclusive) to max (exclusive). The range may also be entered as (Bound<T>, Bound<T>), so for example range((Excluded(4), Included(10))) will yield a left-exclusive, right-inclusive range from 4 to 10.

Panics

Panics if range start > end. Panics if range start == end and both bounds are Excluded.

Examples

Basic usage:

use std::collections::BTreeMap;
use std::ops::Bound::Included;

let mut map = BTreeMap::new();
map.insert(3, "a");
map.insert(5, "b");
map.insert(8, "c");
for (&key, &value) in map.range((Included(&4), Included(&8))) {
    println!("{}: {}", key, value);
}
assert_eq!(Some((&5, &"b")), map.range(4..).next());

Important traits for Iter<'a, K, V>

impl<'a, K, V> Iterator for Iter<'a, K, V> where
    K: 'a,
    V: 'a,  type Item = (&'a K, &'a V);

pub fn iter(&self) -> Iter<K, V>

Gets an iterator over the entries of the map, sorted by key.

Examples

Basic usage:

use std::collections::BTreeMap;

let mut map = BTreeMap::new();
map.insert(3, "c");
map.insert(2, "b");
map.insert(1, "a");

for (key, value) in map.iter() {
    println!("{}: {}", key, value);
}

let (first_key, first_value) = map.iter().next().unwrap();
assert_eq!((*first_key, *first_value), (1, "a"));

Important traits for Keys<'a, K, V>

impl<'a, K, V> Iterator for Keys<'a, K, V> type Item = &'a K;

pub fn keys(&'a self) -> Keys<'a, K, V>

Gets an iterator over the keys of the map, in sorted order.

Examples

Basic usage:

use std::collections::BTreeMap;

let mut a = BTreeMap::new();
a.insert(2, "b");
a.insert(1, "a");

let keys: Vec<_> = a.keys().cloned().collect();
assert_eq!(keys, [1, 2]);

Important traits for Values<'a, K, V>

impl<'a, K, V> Iterator for Values<'a, K, V> type Item = &'a V;

pub fn values(&'a self) -> Values<'a, K, V>

Gets an iterator over the values of the map, in order by key.

Examples

Basic usage:

use std::collections::BTreeMap;

let mut a = BTreeMap::new();
a.insert(1, "hello");
a.insert(2, "goodbye");

let values: Vec<&str> = a.values().cloned().collect();
assert_eq!(values, ["hello", "goodbye"]);

pub fn len(&self) -> usize

Returns the number of elements in the map.

Examples

Basic usage:

use std::collections::BTreeMap;

let mut a = BTreeMap::new();
assert_eq!(a.len(), 0);
a.insert(1, "a");
assert_eq!(a.len(), 1);

pub fn is_empty(&self) -> bool

Returns true if the map contains no elements.

Examples

Basic usage:

use std::collections::BTreeMap;

let mut a = BTreeMap::new();
assert!(a.is_empty());
a.insert(1, "a");
assert!(!a.is_empty());

Trait Implementations

impl Debug for StateDiff

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl PartialEq for StateDiff

fn eq(&self, other: &StateDiff) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &StateDiff) -> bool

This method tests for !=.

impl Eq for StateDiff

impl Clone for StateDiff

fn clone(&self) -> StateDiff

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Display for StateDiff

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Deref for StateDiff

type Target = BTreeMap<Address, AccountDiff>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.