Switch to hashbrown's RawTable internally

.travis.yml

@@ -2,10 +2,6 @@ language: rust
 sudo: false
 matrix:
   include:
-    # MSRV is lower for non-dev builds
-    - rust: 1.18.0
-      env:
-       - SKIP_TEST=1
     - rust: 1.32.0
     - rust: 1.34.2
     - rust: stable

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "indexmap"
-version = "1.4.0"
+version = "1.5.0"
 authors = [
 "bluss",
 "Josh Stone <cuviper@gmail.com>"
@@ -35,8 +35,13 @@ autocfg = "1"
 serde = { version = "1.0", optional = true, default-features = false }
 rayon = { version = "1.0", optional = true }
 
+[dependencies.hashbrown]
+version = "0.8.1"
+default-features = false
+features = ["raw"]
+
 [dev-dependencies]
-itertools = "0.8"
+itertools = "0.9"
 rand = {version = "0.7", features = ["small_rng"] }
 quickcheck = { version = "0.9", default-features = false }
 fnv = "1.0"

README.rst

@@ -12,11 +12,10 @@ indexmap
 .. |docs| image:: https://docs.rs/indexmap/badge.svg
 .. _docs: https://docs.rs/indexmap
 
-.. |rustc| image:: https://img.shields.io/badge/rust-1.18%2B-orange.svg
-.. _rustc: https://img.shields.io/badge/rust-1.18%2B-orange.svg
+.. |rustc| image:: https://img.shields.io/badge/rust-1.32%2B-orange.svg
+.. _rustc: https://img.shields.io/badge/rust-1.32%2B-orange.svg
 
-A safe, pure-Rust hash table which preserves (in a limited sense) insertion
-order.
+A pure-Rust hash table which preserves (in a limited sense) insertion order.
 
 This crate implements compact map and set data-structures,
 where the iteration order of the keys is independent from their hash or
@@ -45,11 +44,6 @@ was indexmap, a hash table that has following properties:
   - It's the usual backwards shift deletion, but only on the index vector, so
     it's cheaper because it's moving less memory around.
 
-Does not implement (Yet)
-------------------------
-
-- ``.reserve()`` exists but does not have a complete implementation
-
 Performance
 -----------
 
@@ -86,6 +80,25 @@ which is roughly:
 Recent Changes
 ==============
 
+- 1.5.0
+
+  - **MSRV**: Rust 1.32 or later is now required.
+
+  - The inner hash table is now based on ``hashbrown`` by @cuviper in PR 131_.
+    This also completes the method ``reserve`` and adds ``shrink_to_fit``.
+
+  - Add new methods ``get_key_value``, ``remove_entry``, ``swap_remove_entry``,
+    and ``shift_remove_entry``, by @cuviper in PR 136_
+
+  - ``Clone::clone_from`` reuses allocations by @cuviper in PR 125_
+
+  - Add new method ``reverse`` by @linclelinkpart5 in PR 128_
+
+.. _125: https://github.com/bluss/indexmap/pull/125
+.. _128: https://github.com/bluss/indexmap/pull/128
+.. _131: https://github.com/bluss/indexmap/pull/131
+.. _136: https://github.com/bluss/indexmap/pull/136
+
 - 1.4.0
 
   - Add new method ``get_index_of`` by @Thermatrix in PR 115_ and 120_

src/lib.rs

@@ -1,3 +1,4 @@
+// We *mostly* avoid unsafe code, but `map::core::raw` allows it to use `RawTable` buckets.
 #![deny(unsafe_code)]
 #![doc(html_root_url = "https://docs.rs/indexmap/1/")]
 #![cfg_attr(not(has_std), no_std)]
@@ -53,9 +54,8 @@
 //!
 //! ### Rust Version
 //!
-//! This version of indexmap requires Rust 1.18 or later, or 1.32+ for
-//! development builds, and Rust 1.36+ for using with `alloc` (without `std`),
-//! see below.
+//! This version of indexmap requires Rust 1.32 or later, or Rust 1.36+ for
+//! using with `alloc` (without `std`), see below.
 //!
 //! The indexmap 1.x release series will use a carefully considered version
 //! upgrade policy, where in a later 1.x version, we will raise the minimum
@@ -80,9 +80,10 @@
 //! [def]: map/struct.IndexMap.html#impl-Default
 
 #[cfg(not(has_std))]
-#[macro_use(vec)]
 extern crate alloc;
 
+extern crate hashbrown;
+
 #[cfg(not(has_std))]
 pub(crate) mod std {
     pub use core::*;
@@ -106,8 +107,6 @@ mod mutable_keys;
 mod serde;
 mod util;
 
-mod map_core;
-
 pub mod map;
 pub mod set;
 
@@ -129,8 +128,8 @@ struct HashValue(usize);
 
 impl HashValue {
     #[inline(always)]
-    fn get(self) -> usize {
-        self.0
+    fn get(self) -> u64 {
+        self.0 as u64
     }
 }