1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use std::default::Default;
13 use std::iter::FromIterator;
16 use serialize::{Encodable, Decodable, Encoder, Decoder};
18 /// A non-growable owned slice. This is a separate type to allow the
19 /// representation to change.
20 #[derive(Hash, PartialEq, Eq, PartialOrd, Ord)]
21 pub struct OwnedSlice<T> {
25 impl<T:fmt::Show> fmt::Show for OwnedSlice<T> {
26 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
31 impl<T> OwnedSlice<T> {
32 pub fn empty() -> OwnedSlice<T> {
33 OwnedSlice { data: box [] }
37 pub fn from_vec(v: Vec<T>) -> OwnedSlice<T> {
38 OwnedSlice { data: v.into_boxed_slice() }
42 pub fn into_vec(self) -> Vec<T> {
46 pub fn as_slice<'a>(&'a self) -> &'a [T] {
50 pub fn move_iter(self) -> vec::IntoIter<T> {
51 self.into_vec().into_iter()
54 pub fn map<U, F: FnMut(&T) -> U>(&self, f: F) -> OwnedSlice<U> {
55 self.iter().map(f).collect()
59 impl<T> Deref for OwnedSlice<T> {
62 fn deref(&self) -> &[T] {
67 impl<T> Default for OwnedSlice<T> {
68 fn default() -> OwnedSlice<T> {
73 impl<T: Clone> Clone for OwnedSlice<T> {
74 fn clone(&self) -> OwnedSlice<T> {
75 OwnedSlice::from_vec(self.as_slice().to_vec())
79 impl<T> FromIterator<T> for OwnedSlice<T> {
80 fn from_iter<I: Iterator<Item=T>>(iter: I) -> OwnedSlice<T> {
81 OwnedSlice::from_vec(iter.collect())
85 impl<S: Encoder<E>, T: Encodable<S, E>, E> Encodable<S, E> for OwnedSlice<T> {
86 fn encode(&self, s: &mut S) -> Result<(), E> {
87 self.as_slice().encode(s)
91 impl<D: Decoder<E>, T: Decodable<D, E>, E> Decodable<D, E> for OwnedSlice<T> {
92 fn decode(d: &mut D) -> Result<OwnedSlice<T>, E> {
93 Ok(OwnedSlice::from_vec(match Decodable::decode(d) {
95 Err(e) => return Err(e)