sp-im 0.3.0

Immutable datatypes for no_std use within Substrate
Documentation 
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#![allow(dead_code)]

use core::{
  marker::PhantomData,
  ops::Deref,
};

use alloc::{
  rc::Rc as RRc,
  sync::Arc as RArc,
};

use crate::nodes::chunk::Chunk;

pub(crate) trait PoolDefault: Default {}
pub(crate) trait PoolClone: Clone {}

impl<A> PoolDefault for Chunk<A> {}
impl<A> PoolClone for Chunk<A> where A: Clone {}

pub(crate) struct Pool<A>(PhantomData<A>);

impl<A> Pool<A> {
  pub(crate) fn new(_size: usize) -> Self { Pool(PhantomData) }

  pub(crate) fn get_pool_size(&self) -> usize { 0 }

  pub(crate) fn fill(&self) {}
}

impl<A> Clone for Pool<A> {
  fn clone(&self) -> Self { Self::new(0) }
}

// Rc

#[derive(Default)]
pub(crate) struct Rc<A>(RRc<A>);

impl<A> Rc<A> {
  #[inline(always)]
  pub(crate) fn default(_pool: &Pool<A>) -> Self
  where A: PoolDefault {
    Self(Default::default())
  }

  #[inline(always)]
  pub(crate) fn new(_pool: &Pool<A>, value: A) -> Self { Rc(RRc::new(value)) }

  #[inline(always)]
  pub(crate) fn clone_from(_pool: &Pool<A>, value: &A) -> Self
  where A: PoolClone {
    Rc(RRc::new(value.clone()))
  }

  #[inline(always)]
  pub(crate) fn make_mut<'a>(_pool: &Pool<A>, this: &'a mut Self) -> &'a mut A
  where A: PoolClone {
    RRc::make_mut(&mut this.0)
  }

  #[inline(always)]
  pub(crate) fn ptr_eq(left: &Self, right: &Self) -> bool {
    RRc::ptr_eq(&left.0, &right.0)
  }

  pub(crate) fn unwrap_or_clone(this: Self) -> A
  where A: PoolClone {
    RRc::try_unwrap(this.0).unwrap_or_else(|r| (*r).clone())
  }
}

impl<A> Clone for Rc<A> {
  #[inline(always)]
  fn clone(&self) -> Self { Rc(self.0.clone()) }
}

impl<A> Deref for Rc<A> {
  type Target = A;

  #[inline(always)]
  fn deref(&self) -> &Self::Target { self.0.deref() }
}

impl<A> PartialEq for Rc<A>
where A: PartialEq
{
  #[inline(always)]
  fn eq(&self, other: &Self) -> bool { **self == **other }
}

impl<A> Eq for Rc<A> where A: Eq {}

impl<A> core::fmt::Debug for Rc<A>
where A: core::fmt::Debug
{
  #[inline(always)]
  fn fmt(
    &self,
    f: &mut core::fmt::Formatter<'_>,
  ) -> Result<(), core::fmt::Error> {
    self.0.fmt(f)
  }
}

// Arc

#[derive(Default)]
pub(crate) struct Arc<A>(RArc<A>);

impl<A> Arc<A> {
  #[inline(always)]
  pub(crate) fn default(_pool: &Pool<A>) -> Self
  where A: PoolDefault {
    Self(Default::default())
  }

  #[inline(always)]
  pub(crate) fn new(_pool: &Pool<A>, value: A) -> Self {
    Self(RArc::new(value))
  }

  #[inline(always)]
  pub(crate) fn clone_from(_pool: &Pool<A>, value: &A) -> Self
  where A: PoolClone {
    Self(RArc::new(value.clone()))
  }

  #[inline(always)]
  pub(crate) fn make_mut<'a>(_pool: &Pool<A>, this: &'a mut Self) -> &'a mut A
  where A: PoolClone {
    RArc::make_mut(&mut this.0)
  }

  #[inline(always)]
  pub(crate) fn ptr_eq(left: &Self, right: &Self) -> bool {
    RArc::ptr_eq(&left.0, &right.0)
  }

  pub(crate) fn unwrap_or_clone(this: Self) -> A
  where A: PoolClone {
    RArc::try_unwrap(this.0).unwrap_or_else(|r| (*r).clone())
  }
}

impl<A> Clone for Arc<A> {
  #[inline(always)]
  fn clone(&self) -> Self { Self(self.0.clone()) }
}

impl<A> Deref for Arc<A> {
  type Target = A;

  #[inline(always)]
  fn deref(&self) -> &Self::Target { self.0.deref() }
}

impl<A> PartialEq for Arc<A>
where A: PartialEq
{
  #[inline(always)]
  fn eq(&self, other: &Self) -> bool { **self == **other }
}

impl<A> Eq for Arc<A> where A: Eq {}

impl<A> core::fmt::Debug for Arc<A>
where A: core::fmt::Debug
{
  #[inline(always)]
  fn fmt(
    &self,
    f: &mut core::fmt::Formatter<'_>,
  ) -> Result<(), core::fmt::Error> {
    self.0.fmt(f)
  }
}