rust-rc

A copy of the http://doc.rust-lang.org/std/rc/ module that runs on stable Rust with Weak references.

As of this writing, std::rc::Weak is marked #[unstable] and therefore can not be used on stable Rust yet.

To make this work, some features had to be removed:

• Unsized / dynamically-sized types T are not supported in Rc<T> or Weak<T>
• #[unsafe_no_drop_flag] is not used, so (in curent Rust) Rc<T> and Weak<T> have a drop flag and are two words big (16 bytes 64-bit platforms) instead of one.
• NonZero is not used, so Option<Rc<T>> and Option<Weak<T>> are one word bigger than Rc<T> or Weak<T> (for a total of 24 bytes instead of 8 on 64-bit platforms).
• std::intrinsics::assume is not used, so the optimizer may not be able to remove as many redundant checks.

Recommended usage

```toml

Cargo.toml

[features] unstable = []

[dependencies] rc = { "0.1.0", # Unfortunately, as of this writing, Cargo features can not disable dependencies. # See https://github.com/rust-lang/cargo/issues/1839 # optional = true, } ```

```rust // lib.rs

[cfg(not(feature = "unstable"))] extern crate rc;

```

```rust // some_module.rs

[cfg(feature = "unstable")] use std::rc::{Rc, Weak};

[cfg(not(feature = "unstable"))] use rc::{Rc, Weak};

```