Merge pull request #37 from bluss/next

Next versions

.travis.yml

@@ -15,6 +15,7 @@ matrix:
       - NODROP_FEATURES='use_needs_drop'
     - rust: nightly
       env:
+      - FEATURES='use_union'
       - NODROP_FEATURES='use_union'
 branches:
   only:

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "arrayvec"
-version = "0.3.16"
+version = "0.3.17"
 authors = ["bluss"]
 license = "MIT/Apache-2.0"
 
@@ -15,10 +15,11 @@ version = "0.2.12"
 default-features = false
 
 [dependencies.nodrop]
-version = "0.1.6"
+version = "0.1.8"
 path = "nodrop"
 default-features = false
 
 [features]
 default = ["std"]
 std = ["odds/std", "nodrop/std"]
+use_union = ["nodrop/use_union"]

Makefile

@@ -1,9 +1,9 @@
-DOCCRATES = arrayvec nodrop odds
+DOCCRATES = arrayvec nodrop nodrop_union odds
 
 # deps to delete the generated docs
 RMDOCS = 
 
-FEATURES = odds/unstable
+FEATURES = "odds/unstable nodrop/use_union"
 
 VERSIONS = $(patsubst %,target/VERS/%,$(DOCCRATES))
 

README.rst

@@ -22,6 +22,11 @@ __ http://bluss.github.io/arrayvec
 Recent Changes (arrayvec)
 -------------------------
 
+- 0.3.17
+
+  - Added crate feature ``use_union`` which forwards to the nodrop crate feature
+  - Added methods ``.is_full()`` to ``ArrayVec`` and ``ArrayString``.
+
 - 0.3.16
 
   - Added method ``.retain()`` to ``ArrayVec``.
@@ -91,6 +96,17 @@ Recent Changes (nodrop)
     optimization, which skips overwriting if the inner value does not need
     drop.
 
+Recent Changes (nodrop-union)
+-----------------------
+
+- 0.1.9
+
+  - Add ``Copy, Clone`` implementations
+
+- 0.1.8
+
+  - Initial release
+
 
 License
 =======

nodrop-union/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
 name = "nodrop-union"
-version = "0.1.8"
+version = "0.1.9"
 authors = ["bluss"]
 
 license = "MIT/Apache-2.0"
 
 description = "A wrapper type to inhibit drop (destructor). Implementation crate for nodrop, the untagged unions implementation (which is unstable / requires nightly) as of this writing."
-documentation = "http://bluss.github.io/arrayvec/doc/nodrop"
+documentation = "http://bluss.github.io/arrayvec/doc/nodrop_union"
 repository = "https://github.com/bluss/arrayvec"
 
 keywords = ["container", "drop", "no_std"]

nodrop-union/src/lib.rs

@@ -1,19 +1,21 @@
 //!
-//! The **nodrop** crate has the following cargo feature flags:
+//! **nodrop-union** is the untagged unions (requires Rust nightly channel and
+//! unstable as of this writing) implementation for the **nodrop** crate.
 //!
-//! - `std`
-//!   - Optional, enabled by default
-//!   - Requires Rust 1.6 *to disable*
-//!   - Use libstd
-//! - `use_needs_drop`
-//!   - Optional
-//!   - Requires nightly channel.
-//!   - Use `needs_drop` to skip overwriting if not necessary
-//! - `use_union`
-//!   - Optional
-//!   - Requires nightly channel
-//!   - Using untagged union, finally we have an implementation of `NoDrop` without hacks,
-//!     for example the fact that `NoDrop<T>` never has a destructor anymore.
+//! It is intended you use this through the **nodrop** crate with the `use_union`
+//! crate feature enabled.
+//!
+//! This is the future implementation of nodrop, once it is stable.
+//!
+//! This implementation is a lot better:
+//!
+//! - Does not have a destructor at all
+//! - Can be Copy if T is Copy
+//! - No space overhead / no runtime flag
+//!
+//! This means that this implementation has extensions that the
+//! stable nodrop does not yet have, which is something to be aware of if
+//! you are switching.
 //!
 
 #![feature(untagged_unions)]
@@ -25,10 +27,24 @@ extern crate core as std;
 use std::ops::{Deref, DerefMut};
 
 #[allow(unions_with_drop_fields)]
+#[derive(Copy)]
 union UnionFlag<T> {
     value: T,
 }
 
+impl<T: Clone> Clone for UnionFlag<T> {
+    fn clone(&self) -> Self {
+        unsafe {
+            UnionFlag { value: self.value.clone() }
+        }
+    }
+}
+
+/// A type holding **T** that will not call its destructor on drop
+///
+/// The untagged unions implementation of `NoDrop<T>` is Copy where T: Copy,
+/// which was not possible in the stable implementation.
+#[derive(Copy, Clone)]
 pub struct NoDrop<T>(UnionFlag<T>);
 
 impl<T> NoDrop<T> {

src/lib.rs

@@ -7,6 +7,12 @@
 //!   - Optional, enabled by default
 //!   - Requires Rust 1.6 *to disable*
 //!   - Use libstd
+//!
+//! - `use_union`
+//!   - Optional
+//!   - Requires Rust nightly channel
+//!   - Use the unstable feature untagged unions for the internal implementation,
+//!     which has reduced space overhead
 #![cfg_attr(not(feature="std"), no_std)]
 extern crate odds;
 extern crate nodrop;