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use std::borrow::Borrow;
use std::fmt;
use std::hash::{Hash, Hasher};
use std::ops::Deref;
use std::sync::Arc;
pub mod allocators;
#[cfg(test)]
mod tests;
pub trait Allocator<T: Eq>: Default {
fn allocate(&self, t: T) -> Id<T>;
fn allocations(&self) -> usize;
fn delete_unused(&self);
}
pub trait Allocated: Eq + Sized + 'static {
type Alloc: Allocator<Self>;
fn allocator() -> &'static Self::Alloc;
}
#[derive(Debug, Default, PartialOrd, Ord)]
pub struct Id<T>(Arc<T>);
impl<T> Id<T> {
pub fn id(p: &Self) -> usize {
&*p.0 as *const T as usize
}
}
impl<T: Allocated> Id<T> {
pub fn new(t: T) -> Self {
T::allocator().allocate(t)
}
}
impl<T> Clone for Id<T> {
fn clone(&self) -> Self {
Id(Arc::clone(&self.0))
}
}
impl<T> PartialEq for Id<T> {
fn eq(&self, other: &Self) -> bool {
Arc::ptr_eq(&self.0, &other.0)
}
}
impl<T> Eq for Id<T> {}
impl<T> Hash for Id<T> {
fn hash<H: Hasher>(&self, hasher: &mut H) {
Id::id(self).hash(hasher);
}
}
impl<T> Deref for Id<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
self.0.deref()
}
}
impl<T: fmt::Display> fmt::Display for Id<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl<T> fmt::Pointer for Id<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl<T> AsRef<T> for Id<T> {
fn as_ref(&self) -> &T {
self.0.as_ref()
}
}
impl<T> Borrow<T> for Id<T> {
fn borrow(&self) -> &T {
self.0.borrow()
}
}
#[macro_export]
macro_rules! make_allocator {
($type:ty, $name:ident, $alloc:ident) => {
lazy_static! {
static ref $name: $alloc<$type> = $alloc::default();
}
impl Allocated for $type {
type Alloc = $alloc<$type>;
fn allocator() -> &'static Self::Alloc {
&$name
}
}
};
}