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    // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Implementations of serialization for structures found in libcollections

    use std::hash::Hash;

    use {Decodable, Encodable, Decoder, Encoder, cap_capacity};
    use std::collections::{LinkedList, VecDeque, BTreeMap, BTreeSet, HashMap, HashSet};

    impl<
        T: Encodable
    > Encodable for LinkedList<T> {
        fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
            s.emit_seq(self.len(), |s| {
                for (i, e) in self.iter().enumerate() {
                    try!(s.emit_seq_elt(i, |s| e.encode(s)));
                }
                Ok(())
            })
        }
    }

    impl<T:Decodable> Decodable for LinkedList<T> {
        fn decode<D: Decoder>(d: &mut D) -> Result<LinkedList<T>, D::Error> {
            d.read_seq(|d, len| {
                let mut list = LinkedList::new();
                for i in 0..len {
                    list.push_back(try!(d.read_seq_elt(i, |d| Decodable::decode(d))));
                }
                Ok(list)
            })
        }
    }

    impl<T: Encodable> Encodable for VecDeque<T> {
        fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
            s.emit_seq(self.len(), |s| {
                for (i, e) in self.iter().enumerate() {
                    try!(s.emit_seq_elt(i, |s| e.encode(s)));
                }
                Ok(())
            })
        }
    }

    impl<T:Decodable> Decodable for VecDeque<T> {
        fn decode<D: Decoder>(d: &mut D) -> Result<VecDeque<T>, D::Error> {
            d.read_seq(|d, len| {
                let mut deque: VecDeque<T> = VecDeque::new();
                for i in 0..len {
                    deque.push_back(try!(d.read_seq_elt(i, |d| Decodable::decode(d))));
                }
                Ok(deque)
            })
        }
    }

    impl<
        K: Encodable + Ord,
        V: Encodable
    > Encodable for BTreeMap<K, V> {
        fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
            e.emit_map(self.len(), |e| {
                let mut i = 0;
                for (key, val) in self.iter() {
                    try!(e.emit_map_elt_key(i, |e| key.encode(e)));
                    try!(e.emit_map_elt_val(i, |e| val.encode(e)));
                    i += 1;
                }
                Ok(())
            })
        }
    }

    impl<
        K: Decodable + Ord,
        V: Decodable
    > Decodable for BTreeMap<K, V> {
        fn decode<D: Decoder>(d: &mut D) -> Result<BTreeMap<K, V>, D::Error> {
            d.read_map(|d, len| {
                let mut map = BTreeMap::new();
                for i in 0..len {
                    let key = try!(d.read_map_elt_key(i, |d| Decodable::decode(d)));
                    let val = try!(d.read_map_elt_val(i, |d| Decodable::decode(d)));
                    map.insert(key, val);
                }
                Ok(map)
            })
        }
    }

    impl<
        T: Encodable + Ord
    > Encodable for BTreeSet<T> {
        fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
            s.emit_seq(self.len(), |s| {
                let mut i = 0;
                for e in self.iter() {
                    try!(s.emit_seq_elt(i, |s| e.encode(s)));
                    i += 1;
                }
                Ok(())
            })
        }
    }

    impl<
        T: Decodable + Ord
    > Decodable for BTreeSet<T> {
        fn decode<D: Decoder>(d: &mut D) -> Result<BTreeSet<T>, D::Error> {
            d.read_seq(|d, len| {
                let mut set = BTreeSet::new();
                for i in 0..len {
                    set.insert(try!(d.read_seq_elt(i, |d| Decodable::decode(d))));
                }
                Ok(set)
            })
        }
    }

    impl<K, V> Encodable for HashMap<K, V>
        where K: Encodable + Hash + Eq,
              V: Encodable,
    {
        fn encode<E: Encoder>(&self, e: &mut E) -> Result<(), E::Error> {
            e.emit_map(self.len(), |e| {
                let mut i = 0;
                for (key, val) in self.iter() {
                    try!(e.emit_map_elt_key(i, |e| key.encode(e)));
                    try!(e.emit_map_elt_val(i, |e| val.encode(e)));
                    i += 1;
                }
                Ok(())
            })
        }
    }

    impl<K, V> Decodable for HashMap<K, V>
        where K: Decodable + Hash + Eq,
              V: Decodable,
    {
        fn decode<D: Decoder>(d: &mut D) -> Result<HashMap<K, V>, D::Error> {
            d.read_map(|d, len| {
                let mut map = HashMap::with_capacity(cap_capacity::<(K, V)>(len));
                for i in 0..len {
                    let key = try!(d.read_map_elt_key(i, |d| Decodable::decode(d)));
                    let val = try!(d.read_map_elt_val(i, |d| Decodable::decode(d)));
                    map.insert(key, val);
                }
                Ok(map)
            })
        }
    }

    impl<T> Encodable for HashSet<T> where T: Encodable + Hash + Eq {
        fn encode<E: Encoder>(&self, s: &mut E) -> Result<(), E::Error> {
            s.emit_seq(self.len(), |s| {
                let mut i = 0;
                for e in self.iter() {
                    try!(s.emit_seq_elt(i, |s| e.encode(s)));
                    i += 1;
                }
                Ok(())
            })
        }
    }

    impl<T> Decodable for HashSet<T> where T: Decodable + Hash + Eq, {
        fn decode<D: Decoder>(d: &mut D) -> Result<HashSet<T>, D::Error> {
            d.read_seq(|d, len| {
                let mut set = HashSet::with_capacity(cap_capacity::<T>(len));
                for i in 0..len {
                    set.insert(try!(d.read_seq_elt(i, |d| Decodable::decode(d))));
                }
                Ok(set)
            })
        }
    }

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