0.7.0

CHANGELOG.md

@@ -1,6 +1,15 @@
 Recent Changes (arrayvec)
 =========================
 
+## 0.7.0
+
+- `fn new_const` is now the way to const-construct arrayvec and arraystring,
+  and `fn new` has been reverted to a regular "non-const" function.
+  This works around performance issue #182, where the const fn version did not
+  optimize well. Change by @bluss with thanks to @rodrimati1992 and @niklasf
+  for analyzing the problem.
+- The deprecated feature flag `unstable-const-fn` was removed, since it's not needed
+
 ## 0.6.1
 
 - The ``ArrayVec::new`` and ``ArrayString::new`` constructors are properly

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "arrayvec"
-version = "0.6.1"
+version = "0.7.0"
 authors = ["bluss"]
 license = "MIT OR Apache-2.0"
 edition = "2018"
@@ -37,7 +37,6 @@ harness = false
 [features]
 default = ["std"]
 std = []
-unstable-const-fn = []
 
 [profile.bench]
 debug = true

src/array_string.rs

@@ -73,10 +73,7 @@ impl<const CAP: usize> ArrayString<CAP>
     /// ```
     /// use arrayvec::ArrayString;
     ///
-    /// let mut string = ArrayString::<16>::new();
+    /// static ARRAY: ArrayString<1024> = ArrayString::new_const();
-    /// string.push_str("foo");
-    /// assert_eq!(&string[..], "foo");
-    /// assert_eq!(string.capacity(), 16);
     /// ```
     pub const fn new_const() -> ArrayString<CAP> {
         assert_capacity_limit_const!(CAP);

src/arrayvec.rs

@@ -91,11 +91,7 @@ impl<T, const CAP: usize> ArrayVec<T, CAP> {
     /// ```
     /// use arrayvec::ArrayVec;
     ///
-    /// let mut array = ArrayVec::<_, 16>::new();
+    /// static ARRAY: ArrayVec<u8, 1024> = ArrayVec::new_const();
-    /// array.push(1);
-    /// array.push(2);
-    /// assert_eq!(&array[..], &[1, 2]);
-    /// assert_eq!(array.capacity(), 16);
     /// ```
     pub const fn new_const() -> ArrayVec<T, CAP> {
         assert_capacity_limit_const!(CAP);

src/lib.rs

@@ -11,10 +11,6 @@
 //!   - Optional
 //!   - Enable serialization for ArrayVec and ArrayString using serde 1.x
 //!
-//! - `unstable-const-fn`
-//!   - **deprecated** (has no effect)
-//!   - Not needed, [`ArrayVec::new`] and [`ArrayString::new`] are always `const fn` now
-//!
 //! ## Rust Version
 //!
 //! This version of arrayvec requires Rust 1.51 or later.