107 lines
3.7 KiB
Rust
107 lines
3.7 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Container traits
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use option::Option;
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/// A trait to represent the abstract idea of a container. The only concrete
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/// knowledge known is the number of elements contained within.
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pub trait Container {
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/// Return the number of elements in the container
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fn len(&self) -> uint;
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/// Return true if the container contains no elements
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#[inline]
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fn is_empty(&self) -> bool {
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self.len() == 0
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}
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}
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/// A trait to represent mutable containers
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pub trait Mutable: Container {
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/// Clear the container, removing all values.
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fn clear(&mut self);
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}
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/// A map is a key-value store where values may be looked up by their keys. This
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/// trait provides basic operations to operate on these stores.
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pub trait Map<K, V>: Container {
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/// Return a reference to the value corresponding to the key
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fn find<'a>(&'a self, key: &K) -> Option<&'a V>;
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/// Return true if the map contains a value for the specified key
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#[inline]
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fn contains_key(&self, key: &K) -> bool {
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self.find(key).is_some()
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}
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}
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/// This trait provides basic operations to modify the contents of a map.
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pub trait MutableMap<K, V>: Map<K, V> + Mutable {
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/// Insert a key-value pair into the map. An existing value for a
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/// key is replaced by the new value. Return true if the key did
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/// not already exist in the map.
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#[inline]
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fn insert(&mut self, key: K, value: V) -> bool {
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self.swap(key, value).is_none()
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}
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/// Remove a key-value pair from the map. Return true if the key
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/// was present in the map, otherwise false.
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#[inline]
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fn remove(&mut self, key: &K) -> bool {
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self.pop(key).is_some()
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}
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/// Insert a key-value pair from the map. If the key already had a value
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/// present in the map, that value is returned. Otherwise None is returned.
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fn swap(&mut self, k: K, v: V) -> Option<V>;
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/// Removes a key from the map, returning the value at the key if the key
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/// was previously in the map.
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fn pop(&mut self, k: &K) -> Option<V>;
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/// Return a mutable reference to the value corresponding to the key
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fn find_mut<'a>(&'a mut self, key: &K) -> Option<&'a mut V>;
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}
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/// A set is a group of objects which are each distinct from one another. This
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/// trait represents actions which can be performed on sets to iterate over
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/// them.
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pub trait Set<T>: Container {
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/// Return true if the set contains a value
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fn contains(&self, value: &T) -> bool;
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/// Return true if the set has no elements in common with `other`.
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/// This is equivalent to checking for an empty intersection.
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fn is_disjoint(&self, other: &Self) -> bool;
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/// Return true if the set is a subset of another
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fn is_subset(&self, other: &Self) -> bool;
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/// Return true if the set is a superset of another
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fn is_superset(&self, other: &Self) -> bool;
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// FIXME #8154: Add difference, sym. difference, intersection and union iterators
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}
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/// This trait represents actions which can be performed on sets to mutate
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/// them.
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pub trait MutableSet<T>: Set<T> + Mutable {
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/// Add a value to the set. Return true if the value was not already
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/// present in the set.
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fn insert(&mut self, value: T) -> bool;
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/// Remove a value from the set. Return true if the value was
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/// present in the set.
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fn remove(&mut self, value: &T) -> bool;
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}
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