sass-rs 0.2.2

Higher level binding for the Sass library
Documentation 
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#![allow(dead_code)]
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.


use std::marker::{PhantomData, Send, Sized, Sync};


/// A wrapper around a raw `*mut T` that indicates that the possessor
/// of this wrapper owns the referent. This in turn implies that the
/// `Unique<T>` is `Send`/`Sync` if `T` is `Send`/`Sync`, unlike a raw
/// `*mut T` (which conveys no particular ownership semantics).  It
/// also implies that the referent of the pointer should not be
/// modified without a unique path to the `Unique` reference. Useful
/// for building abstractions like `Vec<T>` or `Box<T>`, which
/// internally use raw pointers to manage the memory that they own.
#[derive(Debug)]
pub struct Unique<T: Sized> {
    pointer: *mut T,
    _marker: PhantomData<T>,
}

/// `Unique` pointers are `Send` if `T` is `Send` because the data they
/// reference is unaliased. Note that this aliasing invariant is
/// unenforced by the type system; the abstraction using the
/// `Unique` must enforce it.
unsafe impl<T: Send + Sized> Send for Unique<T> {}

/// `Unique` pointers are `Sync` if `T` is `Sync` because the data they
/// reference is unaliased. Note that this aliasing invariant is
/// unenforced by the type system; the abstraction using the
/// `Unique` must enforce it.
unsafe impl<T: Sync + Sized> Sync for Unique<T> {}

impl<T: Sized> Unique<T> {
    /// Creates a new `Unique`.
    pub unsafe fn new(ptr: *mut T) -> Unique<T> {
        Unique { pointer: ptr, _marker: PhantomData }
    }

    /// Dereferences the content.
    pub unsafe fn get(&self) -> &T {
        &*self.pointer
    }

    /// Mutably dereferences the content.
    pub unsafe fn get_mut(&mut self) -> &mut T {
        //&mut ***self
        &mut *self.pointer
    }
}