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::{IntoIterator, FromIterator};
17 use serialize::{Encodable, Decodable, Encoder, Decoder};
19 /// A non-growable owned slice. This is a separate type to allow the
20 /// representation to change.
21 #[derive(Hash, PartialEq, Eq, PartialOrd, Ord)]
22 pub struct OwnedSlice<T> {
26 impl<T:fmt::Debug> fmt::Debug for OwnedSlice<T> {
27 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
32 impl<T> OwnedSlice<T> {
33 pub fn empty() -> OwnedSlice<T> {
34 OwnedSlice { data: Box::new([]) }
38 pub fn from_vec(v: Vec<T>) -> OwnedSlice<T> {
39 OwnedSlice { data: v.into_boxed_slice() }
43 pub fn into_vec(self) -> Vec<T> {
47 pub fn as_slice<'a>(&'a self) -> &'a [T] {
51 pub fn move_iter(self) -> vec::IntoIter<T> {
52 self.into_vec().into_iter()
55 pub fn map<U, F: FnMut(&T) -> U>(&self, f: F) -> OwnedSlice<U> {
56 self.iter().map(f).collect()
60 impl<T> Deref for OwnedSlice<T> {
63 fn deref(&self) -> &[T] {
68 impl<T> Default for OwnedSlice<T> {
69 fn default() -> OwnedSlice<T> {
74 impl<T: Clone> Clone for OwnedSlice<T> {
75 fn clone(&self) -> OwnedSlice<T> {
76 OwnedSlice::from_vec(self.to_vec())
80 impl<T> FromIterator<T> for OwnedSlice<T> {
81 fn from_iter<I: IntoIterator<Item=T>>(iter: I) -> OwnedSlice<T> {
82 OwnedSlice::from_vec(iter.into_iter().collect())
86 impl<'a, T> IntoIterator for &'a OwnedSlice<T> {
88 type IntoIter = slice::Iter<'a, T>;
89 fn into_iter(self) -> Self::IntoIter {
94 impl<T: Encodable> Encodable for OwnedSlice<T> {
95 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
96 Encodable::encode(&**self, s)
100 impl<T: Decodable> Decodable for OwnedSlice<T> {
101 fn decode<D: Decoder>(d: &mut D) -> Result<OwnedSlice<T>, D::Error> {
102 Ok(OwnedSlice::from_vec(match Decodable::decode(d) {
104 Err(e) => return Err(e)