106 lines
2.8 KiB
Rust
106 lines
2.8 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of OpenEthereum.
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// OpenEthereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// OpenEthereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
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//! This crate allows automatic caching of `T.len()` with an api that
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//! allows drop in replacement for `parking_lot`
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//! [`Mutex`](../lock_api/struct.Mutex.html)
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//! and [`RwLock`](../lock_api/struct.RwLock.html) for most common use-cases.
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//!
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//! This crate implements `Len` for the following types:
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//! `std::collections::{VecDeque, LinkedList, HashMap, BTreeMap, HashSet, BTreeSet, BinaryHeap}`
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//!
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//! ## Example
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//!
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//! ```rust
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//! extern crate len_caching_lock;
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//! use len_caching_lock::LenCachingMutex;
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//!
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//! fn main() {
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//! let vec: Vec<i32> = Vec::new();
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//! let len_caching_mutex = LenCachingMutex::new(vec);
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//! assert_eq!(len_caching_mutex.lock().len(), len_caching_mutex.load_len());
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//! len_caching_mutex.lock().push(0);
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//! assert_eq!(1, len_caching_mutex.load_len());
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//! }
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//! ```
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extern crate parking_lot;
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use std::{
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collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, LinkedList, VecDeque},
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hash::Hash,
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};
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pub mod mutex;
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pub mod rwlock;
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pub use mutex::LenCachingMutex;
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pub use rwlock::LenCachingRwLock;
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/// Implement to allow a type with a len() method to be used
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/// with [`LenCachingMutex`](mutex/struct.LenCachingMutex.html)
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/// or [`LenCachingRwLock`](rwlock/struct.LenCachingRwLock.html)
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pub trait Len {
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fn len(&self) -> usize;
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}
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impl<T> Len for Vec<T> {
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fn len(&self) -> usize {
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Vec::len(self)
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}
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}
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impl<T> Len for VecDeque<T> {
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fn len(&self) -> usize {
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VecDeque::len(self)
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}
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}
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impl<T> Len for LinkedList<T> {
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fn len(&self) -> usize {
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LinkedList::len(self)
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}
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}
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impl<K: Eq + Hash, V> Len for HashMap<K, V> {
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fn len(&self) -> usize {
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HashMap::len(self)
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}
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}
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impl<K, V> Len for BTreeMap<K, V> {
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fn len(&self) -> usize {
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BTreeMap::len(self)
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}
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}
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impl<T: Eq + Hash> Len for HashSet<T> {
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fn len(&self) -> usize {
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HashSet::len(self)
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}
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}
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impl<T> Len for BTreeSet<T> {
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fn len(&self) -> usize {
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BTreeSet::len(self)
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}
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}
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impl<T: Ord> Len for BinaryHeap<T> {
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fn len(&self) -> usize {
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BinaryHeap::len(self)
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}
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}
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