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use std::{
ops::{Deref, DerefMut},
fmt::{self,Display},
marker::PhantomData,
ptr::NonNull,
};
use crate::pointer_trait::{CanTransmuteElement,GetPointerKind,PK_MutReference};
#[repr(transparent)]
#[derive(StableAbi)]
#[sabi(
bound="T:'a",
)]
pub struct RMut<'a,T>{
ref_: NonNull<T>,
_marker:PhantomData<&'a mut T>,
}
impl<'a,T> Display for RMut<'a,T>
where
T:Display
{
fn fmt(&self,f:&mut fmt::Formatter<'_>)->fmt::Result{
Display::fmt(&**self,f)
}
}
unsafe impl<'a,T> Sync for RMut<'a,T>
where &'a T:Sync
{}
unsafe impl<'a,T> Send for RMut<'a,T>
where &'a T:Send
{}
shared_impls! {
mod=static_ref_impls
new_type=RMut['a][T],
original_type=AAAA,
}
impl<'a,T> RMut<'a,T>{
#[inline]
pub unsafe fn from_raw(ref_:*mut T)->Self
where
T:'a,
{
Self{
ref_: NonNull::new_unchecked(ref_),
_marker:PhantomData,
}
}
#[inline]
pub fn new(ref_:&'a mut T)->Self{
unsafe{ Self::from_raw(ref_) }
}
pub fn reborrow(&mut self) -> RMut<'_, T> {
RMut{
ref_: self.ref_,
_marker: PhantomData,
}
}
#[inline]
pub fn get(self)->&'a T{
unsafe{ &*(self.ref_.as_ptr() as *const T) }
}
#[inline]
pub fn get_mut(self)->&'a mut T{
unsafe{ &mut *self.ref_.as_ptr() }
}
#[inline]
pub fn into_raw(self)->*mut T{
self.ref_.as_ptr()
}
#[inline]
pub fn cast_into_raw<U>(self)->*mut U{
self.ref_.as_ptr() as *mut U
}
}
impl<'a,T> Deref for RMut<'a,T>{
type Target=T;
#[inline(always)]
fn deref(&self)->&T{
unsafe{ &*(self.ref_.as_ptr() as *const T) }
}
}
impl<'a,T> DerefMut for RMut<'a,T>{
#[inline(always)]
fn deref_mut(&mut self)->&mut T{
unsafe{ &mut *self.ref_.as_ptr() }
}
}
unsafe impl<'a,T> GetPointerKind for RMut<'a,T>{
type Kind=PK_MutReference;
}
unsafe impl<'a,T,U> CanTransmuteElement<U> for RMut<'a,T>
where
U:'a,
{
type TransmutedPtr= RMut<'a,U>;
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn construction_test(){
unsafe{
let zero: *mut i32 = &mut 3;
assert_eq!(*RMut::from_raw(zero), 3);
}
assert_eq!(*RMut::new(&mut 99), 99);
}
#[test]
fn access(){
let mut num = 5;
let mut mutref= RMut::new(&mut num);
assert_eq!(*mutref, 5);
*mutref = 21;
assert_eq!(*mutref, 21);
assert_eq!(*mutref.reborrow().get(), 21);
assert_eq!(*mutref.reborrow().get_mut(), 21);
*mutref.reborrow().get_mut() = 34;
unsafe{
let raw = mutref.reborrow().into_raw();
assert_eq!(*raw, 34);
*raw = 55;
}
assert_eq!(num, 55);
}
#[test]
fn transmutes(){
let mut num = !1;
let mutref= RMut::new(&mut num);
unsafe{
let ptr = mutref.cast_into_raw::<i32>();
assert_eq!(*ptr, -2);
*ptr = 55;
}
assert_eq!(num, 55);
}
}