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//! Wrappers around references, boxes or Arcs.
//!
//! Features: 
//!
//! * ARef: `OwningRef` with even further erasure of the owner.
//!
//! * rc::Strong/Weak/Ref/RefMut: An `Rc<RefCell<T>>` in just a few bytes of storage, and poisoning support.
//! 
//! * arc::Strong/Weak/Ref/RefMut: An `Arc<Spinlock<T>>`- the thread-safe version of the above.
//!
//! * RMBA: Wrap a `&T`, `&mut T`, `Box<T>` or `Arc<T>` within the size of a single pointer. 
//!
//! * Bx and Bxm: Boxes without DerefMove.

// #![warn(missing_docs)]

extern crate stable_deref_trait;

use std::ops::{Deref, DerefMut};
use stable_deref_trait::StableDeref;

#[macro_use]
mod rc_macros;

pub mod aref;
pub mod rmba;
mod rc_bitmask;
pub mod rc;
pub mod arc;

pub use crate::aref::ARef as ARef;
pub use crate::aref::ARefs as ARefs;
pub use crate::aref::ARefss as ARefss;
pub use crate::rmba::RMBA as RMBA;

/// Type aliases for an rc with 1 byte of overhead.
pub mod rc1 {
    pub type RCell<T> = crate::rc::RCell<T, u8>;
    pub type Ref<T> = crate::rc::Ref<T, u8>;
    pub type RefMut<T> = crate::rc::RefMut<T, u8>;
    pub type Strong<T> = crate::rc::Strong<T, u8>;
    pub type Weak<T> = crate::rc::Weak<T, u8>;
}

/// Type aliases for an rc with 2 bytes of overhead.
pub mod rc2 {
    pub type RCell<T> = crate::rc::RCell<T, u16>;
    pub type Ref<T> = crate::rc::Ref<T, u16>;
    pub type RefMut<T> = crate::rc::RefMut<T, u16>;
    pub type Strong<T> = crate::rc::Strong<T, u16>;
    pub type Weak<T> = crate::rc::Weak<T, u16>;
}

/// Type aliases for an rc with 4 bytes of overhead.
pub mod rc4 {
    pub type RCell<T> = crate::rc::RCell<T, u32>;
    pub type Ref<T> = crate::rc::Ref<T, u32>;
    pub type RefMut<T> = crate::rc::RefMut<T, u32>;
    pub type Strong<T> = crate::rc::Strong<T, u32>;
    pub type Weak<T> = crate::rc::Weak<T, u32>;
}

/// Type aliases for arc.
pub mod arcu {
    pub type Ref<T> = crate::arc::Ref<T, usize>;
    pub type RefMut<T> = crate::arc::RefMut<T, usize>;
    pub type Strong<T> = crate::arc::Strong<T, usize>;
    pub type Weak<T> = crate::arc::Weak<T, usize>;
}


/// Typedefs for an rc with 8 bytes of overhead.
pub mod rc8 {
    pub type RCell<T> = crate::rc::RCell<T, u64>;
    pub type Ref<T> = crate::rc::Ref<T, u64>;
    pub type RefMut<T> = crate::rc::RefMut<T, u64>;
    pub type Strong<T> = crate::rc::Strong<T, u64>;
    pub type Weak<T> = crate::rc::Weak<T, u64>;
}

/// Typedefs for an rc with 16 bytes of overhead.
pub mod rc16 {
    pub type RCell<T> = crate::rc::RCell<T, u128>;
    pub type Ref<T> = crate::rc::Ref<T, u128>;
    pub type RefMut<T> = crate::rc::RefMut<T, u128>;
    pub type Strong<T> = crate::rc::Strong<T, u128>;
    pub type Weak<T> = crate::rc::Weak<T, u128>;
}


/// A simple wrapper around Box to avoid DerefMove.
///
/// There is no way to get to
/// &Box<T>, just &T. This way you can return a Bx<T> in your API and still be
/// sure the inner struct does not move in memory. (This might be helpful if you're
/// dealing with FFI or unsafe code.)
#[derive(Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Bx<T: ?Sized>(Box<T>);

impl<T> Bx<T> {
    pub fn new(t: T) -> Bx<T> { Bx(Box::new(t)) }
}

impl<T: ?Sized> From<Box<T>> for Bx<T> {
    fn from(t: Box<T>) -> Bx<T> { Bx(t) }
}

impl<T: ?Sized> Deref for Bx<T> {
    type Target = T;
    #[inline]
    fn deref(&self) -> &T { &self.0 }
}

unsafe impl<T: ?Sized> StableDeref for Bx<T> {}

/// A simple wrapper around Box to avoid DerefMove. Like Bx,
/// but also allows mutable access to the interior of the box.
///
/// Note that this will allow callers to use e g `mem::swap` and
/// `mem::replace` to move the box's contents to other memory
/// locations.
#[derive(Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Bxm<T: ?Sized>(Box<T>);

impl<T> Bxm<T> {
    pub fn new(t: T) -> Bxm<T> { Bxm(Box::new(t)) }
}

impl<T: ?Sized> From<Box<T>> for Bxm<T> {
    fn from(t: Box<T>) -> Bxm<T> { Bxm(t) }
}

impl<T: ?Sized> Deref for Bxm<T> {
    type Target = T;
    #[inline]
    fn deref(&self) -> &T { &self.0 }
}

impl<T: ?Sized> DerefMut for Bxm<T> {
    #[inline]
    fn deref_mut(&mut self) -> &mut T { &mut self.0 }
}

unsafe impl<T: ?Sized> StableDeref for Bxm<T> {}