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|
use std::{ops::{Index, IndexMut, Deref, DerefMut, Add, Sub, Mul}, marker::PhantomData, ptr::NonNull, fmt::{Debug, Display}};
use crate::prelude::*;
pub struct Gc<T> {
ptr: NonNull<GcInner<T>>,
phantom: PhantomData<GcInner<T>>
}
struct GcInner<T> {
rc: usize,
data: T
}
impl<T> Gc<T> {
pub fn new(data: T) -> Self {
let boxed = Box::new(GcInner {
rc: 1,
data,
});
Self {
ptr: NonNull::new(Box::into_raw(boxed)).unwrap(),
phantom: PhantomData
}
}
}
impl <T: Clone> Gc<T> {
pub fn into_inner(self) -> T {
unsafe {
self.ptr.as_ref().data.clone()
}
}
fn data(&self) -> T {
unsafe {
self.ptr.as_ref().data.clone()
}
}
}
impl <T: ValueClone> ValueClone for Gc<T> {
fn deep_clone(&self) -> Self {
unsafe {
let data = self.ptr.as_ref().data.deep_clone();
Self::new(data)
}
}
fn shallow_clone(&self) -> Self {
unsafe {
let data = self.ptr.as_ref().data.shallow_clone();
Self::new(data)
}
}
}
impl<T> From<T> for Gc<T> {
fn from(value: T) -> Self {
Gc::new(value)
}
}
impl<T: IndexMut<Idx>, Idx> IndexMut<Idx> for Gc<T> {
fn index_mut(&mut self, index: Idx) -> &mut Self::Output {
self.deref_mut().index_mut(index)
}
}
impl<T: Index<Idx>, Idx> Index<Idx> for Gc<T> {
type Output = T::Output;
fn index(&self, index: Idx) -> &Self::Output {
self.deref().index(index)
}
}
impl<T> DerefMut for Gc<T> {
fn deref_mut(&mut self) -> &mut Self::Target {
unsafe {
&mut self.ptr.as_mut().data
}
}
}
impl<T> Deref for Gc<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
unsafe {
&self.ptr.as_ref().data
}
}
}
impl <T: PartialEq> PartialEq for Gc<T> {
fn eq(&self, other: &Self) -> bool {
self.deref().eq(other.deref())
}
}
impl <T: Iterator> Iterator for Gc<T> {
type Item = T::Item;
fn next(&mut self) -> Option<Self::Item> {
self.deref_mut().next()
}
}
impl<T: Eq> Eq for Gc<T> {}
impl<T> Clone for Gc<T> {
fn clone(&self) -> Self {
unsafe {
let inner = self.ptr.as_ptr().as_mut().unwrap();
inner.rc += 1;
Self {
ptr: self.ptr,
phantom: PhantomData
}
}
}
}
impl<T> Drop for Gc<T> {
fn drop(&mut self) {
unsafe {
let inner = self.ptr.as_mut();
if inner.rc > 1 {
inner.rc -= 1;
} else {
let _ = Box::from_raw(self.ptr.as_ptr());
}
}
}
}
impl<T: Debug> Debug for Gc<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if f.alternate() {
write!(f, "{:#?}", self.deref())
} else {
write!(f, "{:?}", self.deref())
}
}
}
impl<T: Display> Display for Gc<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if f.alternate() {
write!(f, "{:#}", self.deref())
} else {
write!(f, "{}", self.deref())
}
}
}
impl <T: Add + Clone> Add for Gc<T> {
type Output = T::Output;
fn add(self, rhs: Self) -> Self::Output {
let a = self.data();
let b = rhs.data();
a + b
}
}
impl <T: Sub + Clone> Sub for Gc<T> {
type Output = T::Output;
fn sub(self, rhs: Self) -> Self::Output {
let a = self.data();
let b = rhs.data();
a - b
}
}
impl <T: Mul + Clone> Mul for Gc<T> {
type Output = T::Output;
fn mul(self, rhs: Self) -> Self::Output {
let a = self.data();
let b = rhs.data();
a * b
}
}
|
