feat(store): Add new TreeMap implementation

near-sdk/src/store/free_list/mod.rs

@@ -10,7 +10,7 @@ use std::{fmt, mem};
 
 /// Index for value within a bucket.
 #[derive(BorshSerialize, BorshDeserialize, Debug, Hash, PartialEq, Eq, Clone, Copy)]
-pub struct FreeListIndex(u32);
+pub struct FreeListIndex(pub(crate) u32);
 
 /// Unordered container of values. This is similar to [`Vector`] except that values are not
 /// re-arranged on removal, keeping the indices consistent. When an element is removed, it will

near-sdk/src/store/lookup_map/entry.rs

@@ -16,7 +16,7 @@ impl<'a, K, V> Entry<'a, K, V> {
     /// use near_sdk::store::LookupMap;
     ///
     /// let mut map: LookupMap<String, u32> = LookupMap::new(b"m");
-    /// assert_eq!(map.entry("poneyland".to_string()).key(), &"poneyland");
+    /// assert_eq!(map.entry("poneyland".to_string()).key(), "poneyland");
     /// ```
     pub fn key(&self) -> &K {
         match self {

near-sdk/src/store/lookup_map/mod.rs

@@ -8,6 +8,7 @@ use std::marker::PhantomData;
 use borsh::{BorshDeserialize, BorshSerialize};
 use once_cell::unsync::OnceCell;
 
+use super::ERR_NOT_EXIST;
 use crate::crypto_hash::{CryptoHasher, Sha256};
 use crate::utils::{EntryState, StableMap};
 use crate::{env, CacheEntry, IntoStorageKey};
@@ -16,7 +17,6 @@ pub use entry::{Entry, OccupiedEntry, VacantEntry};
 
 const ERR_ELEMENT_DESERIALIZATION: &str = "Cannot deserialize element";
 const ERR_ELEMENT_SERIALIZATION: &str = "Cannot serialize element";
-const ERR_NOT_EXIST: &str = "Key does not exist in map";
 
 type LookupKey = [u8; 32];
 

near-sdk/src/store/mod.rs

@@ -16,11 +16,18 @@ pub use self::lookup_set::LookupSet;
 pub mod unordered_map;
 pub use self::unordered_map::UnorderedMap;
 
+pub mod tree_map;
+pub use self::tree_map::TreeMap;
+
 mod index_map;
 pub(crate) use self::index_map::IndexMap;
 
 pub(crate) mod free_list;
 pub(crate) use self::free_list::FreeList;
 
-const ERR_INCONSISTENT_STATE: &str = "The collection is an inconsistent state. Did previous smart \
-										contract execution terminate unexpectedly?";
+pub(crate) const ERR_INCONSISTENT_STATE: &str =
+    "The collection is an inconsistent state. Did previous smart \
+        contract execution terminate unexpectedly?";
+
+// TODO don't need crate pub once moved
+pub(crate) const ERR_NOT_EXIST: &str = "Key does not exist in map";