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use std::{marker::PhantomData, ops::Deref};
pub struct Ref<'a, T> {
ptr: *const T,
_phantom: PhantomData<&'a T>
}
impl<'a, T> Copy for Ref<'a, T> { }
impl<'a, T> Clone for Ref<'a, T> {
fn clone(&self) -> Self {
*self
}
}
impl<'a, T> Ref<'a, T> {
pub fn new(p: &'a T) -> Self {
Ref { ptr: p as *const T, _phantom: PhantomData}
}
pub unsafe fn null() -> Self {
Ref { ptr: std::ptr::null(), _phantom: PhantomData}
}
pub fn is_null(&self) -> bool {
self.ptr.is_null()
}
pub fn get_ref(self) -> &'a T {
unsafe { &*self.ptr }
}
}
impl<'a, T> PartialEq for Ref<'a, T> {
fn eq(&self, other: &Self) -> bool {
self.ptr == other.ptr && self._phantom == other._phantom
}
}
impl<'a, T> PartialOrd for Ref<'a, T> {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
match self.ptr.partial_cmp(&other.ptr) {
Some(core::cmp::Ordering::Equal) => {}
ord => return ord,
}
self._phantom.partial_cmp(&other._phantom)
}
}
impl<'a, T> Deref for Ref<'a, T> {
type Target = T;
fn deref(&self) -> &Self::Target {
unsafe { &*self.ptr }
}
}