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    // Copyright 2015 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.

    use core::cmp::Ordering;

    use borrow::Borrow;

    use super::node::{Handle, NodeRef, marker};

    use super::node::ForceResult::*;
    use self::SearchResult::*;

    pub enum SearchResult<BorrowType, K, V, FoundType, GoDownType> {
        Found(Handle<NodeRef<BorrowType, K, V, FoundType>, marker::KV>),
        GoDown(Handle<NodeRef<BorrowType, K, V, GoDownType>, marker::Edge>)
    }

    pub fn search_tree<BorrowType, K, V, Q: ?Sized>(
        mut node: NodeRef<BorrowType, K, V, marker::LeafOrInternal>,
        key: &Q
    ) -> SearchResult<BorrowType, K, V, marker::LeafOrInternal, marker::Leaf>
            where Q: Ord, K: Borrow<Q> {

        loop {
            match search_node(node, key) {
                Found(handle) => return Found(handle),
                GoDown(handle) => match handle.force() {
                    Leaf(leaf) => return GoDown(leaf),
                    Internal(internal) => {
                        node = internal.descend();
                        continue;
                    }
                }
            }
        }
    }

    pub fn search_node<BorrowType, K, V, Type, Q: ?Sized>(
        node: NodeRef<BorrowType, K, V, Type>,
        key: &Q
    ) -> SearchResult<BorrowType, K, V, Type, Type>
            where Q: Ord, K: Borrow<Q> {

        match search_linear(&node, key) {
            (idx, true) => Found(
                Handle::new_kv(node, idx)
            ),
            (idx, false) => SearchResult::GoDown(
                Handle::new_edge(node, idx)
            )
        }
    }

    pub fn search_linear<BorrowType, K, V, Type, Q: ?Sized>(
        node: &NodeRef<BorrowType, K, V, Type>,
        key: &Q
    ) -> (usize, bool)
            where Q: Ord, K: Borrow<Q> {

        for (i, k) in node.keys().iter().enumerate() {
            match key.cmp(k.borrow()) {
                Ordering::Greater => {},
                Ordering::Equal => return (i, true),
                Ordering::Less => return (i, false)
            }
        }
        (node.keys().len(), false)
    }

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