pub enum LeveledHashMapError<K> {
KeyTooMany,
KeyNotExist {
level: usize,
key: Arc<K>,
},
KeyChainEmpty,
KeyChainIncorrect {
level: usize,
key: Arc<K>,
last_key: Option<Arc<K>>,
},
}
Expand description
Possible errors come from LeveledHashMap
.
Variants
KeyTooMany
The length of a key chain is over the max level of a LeveledHashMap
.
use std::sync::Arc;
use leveled_hash_map::{LeveledHashMap, LeveledHashMapError};
let mut map = LeveledHashMap::new();
map.insert(&[Arc::new("food")], 100).unwrap();
// now the map has "Level 0", "Level 0" is available to be got, "Level 0" and "Level 1" are available to be inserted
assert_eq!(&100, map.get_advanced(&[Arc::new("food")], 0).unwrap());
// try to get value at "Level 1"
match map.get_professional(&[Arc::new("food"), Arc::new("dessert")], 0) {
Ok(_) => unreachable!(),
Err(err) => match err {
LeveledHashMapError::KeyTooMany => (),
_ => unreachable!()
}
}
// try to insert value to "Level 2"
match map.insert(&[Arc::new("food"), Arc::new("dessert"), Arc::new("cake")], 10) {
Ok(_) => unreachable!(),
Err(err) => match err {
LeveledHashMapError::KeyTooMany => (),
_ => unreachable!()
}
}
// try to insert value to "Level 1"
match map.insert(&[Arc::new("food"), Arc::new("dessert")], 10) {
Ok(_) => (),
Err(err) => unreachable!()
}
KeyNotExist
The key chain is correct, but the last key in the key chain does not exist.
use std::sync::Arc;
use leveled_hash_map::{LeveledHashMap, LeveledHashMapError};
let mut map = LeveledHashMap::new();
map.insert(&[Arc::new("food")], 100).unwrap();
map.insert(&[Arc::new("food"), Arc::new("dessert")], 100).unwrap();
map.insert(&[Arc::new("food"), Arc::new("dessert"), Arc::new("cake")], 100).unwrap();
// try to get "food/dessert/chocolate"
match map.get_professional(&[Arc::new("food"), Arc::new("dessert"), Arc::new("chocolate")], 0) {
Ok(_) => unreachable!(),
Err(err) => {
match err {
LeveledHashMapError::KeyNotExist {
level,
key,
} => {
assert_eq!(2, level);
assert_eq!(Arc::new("chocolate"), key);
}
_ => unreachable!(),
}
}
}
KeyChainEmpty
The key chain is empty.
use std::sync::Arc;
use leveled_hash_map::{LeveledHashMap, LeveledHashMapError};
let mut map = LeveledHashMap::new();
map.insert(&[Arc::new("food")], 100).unwrap();
// try to get ""
match map.get_professional(&[], 0) {
Ok(_) => unreachable!(),
Err(err) => {
match err {
LeveledHashMapError::KeyChainEmpty => (),
_ => unreachable!(),
}
}
}
KeyChainIncorrect
The key chain is incorrect.
use std::sync::Arc;
use leveled_hash_map::{LeveledHashMap, LeveledHashMapError};
let mut map = LeveledHashMap::new();
map.insert(&[Arc::new("food")], 100).unwrap();
map.insert(&[Arc::new("food"), Arc::new("meat")], 200).unwrap();
map.insert(&[Arc::new("food"), Arc::new("dessert")], 100).unwrap();
map.insert(&[Arc::new("food"), Arc::new("dessert"), Arc::new("cake")], 100).unwrap();
// try to get "food/meat/chocolate", here "food/meat" exists
match map.get_professional(&[Arc::new("food"), Arc::new("meat"), Arc::new("cake")], 0) {
Ok(_) => unreachable!(),
Err(err) => {
match err {
LeveledHashMapError::KeyChainIncorrect {
level,
key,
last_key,
} => {
assert_eq!(2, level);
assert_eq!(Arc::new("cake"), key);
assert_eq!(Some(Arc::new("dessert")), last_key);
}
_ => unreachable!(),
}
}
}
Trait Implementations
sourceimpl<K> Debug for LeveledHashMapError<K>
impl<K> Debug for LeveledHashMapError<K>
sourceimpl<K> Display for LeveledHashMapError<K>
impl<K> Display for LeveledHashMapError<K>
sourceimpl<K> Error for LeveledHashMapError<K>
impl<K> Error for LeveledHashMapError<K>
1.30.0 · sourcefn source(&self) -> Option<&(dyn Error + 'static)>
fn source(&self) -> Option<&(dyn Error + 'static)>
The lower-level source of this error, if any. Read more
sourcefn backtrace(&self) -> Option<&Backtrace>
fn backtrace(&self) -> Option<&Backtrace>
🔬 This is a nightly-only experimental API. (
backtrace
)Returns a stack backtrace, if available, of where this error occurred. Read more
1.0.0 · sourcefn description(&self) -> &str
fn description(&self) -> &str
👎 Deprecated since 1.42.0:
use the Display impl or to_string()
Auto Trait Implementations
impl<K> RefUnwindSafe for LeveledHashMapError<K> where
K: RefUnwindSafe,
impl<K> Send for LeveledHashMapError<K> where
K: Send + Sync,
impl<K> Sync for LeveledHashMapError<K> where
K: Send + Sync,
impl<K> Unpin for LeveledHashMapError<K>
impl<K> UnwindSafe for LeveledHashMapError<K> where
K: RefUnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more