Rust 如何检查两个引用变量是否借用同一对象？

我有一个所有存储只读引用的结构，例如：

struct Pt { x : f32, y : f32, }
struct Tr<'a> { a : &'a Pt }

所以现在我有了

impl<'a> PartialEq for Tr<'a> {
    fn eq(&self, v : &Tr<'a>) -> bool {
        // self.a == v.a // doesn't work.
    }
}

impl{
fn eq&self，v:&Tr将引用转换为原始指针并进行比较

impl<'a> PartialEq for Tr<'a> {
    fn eq(&self, v: &Tr<'a>) -> bool {
        self.a as *const _ == v.a as *const _
    }
}

impl{
fn eq（&self，v:&Tr您可以用来比较两个指针的地址。引用（
&T
或
&mut T
）将自动强制底层指针（
*const T
）当然，可变引用与另一个引用具有相同的地址是没有意义的，因为可变引用始终是独占引用，但它仍然可以强制为
*常量T

// This derive will use the equality of the underlying fields
#[derive(PartialEq)]
struct Pt {
    x: f32,
    y: f32,
}

impl Pt {
    fn new(x: f32, y: f32) -> Self {
        Self { x, y }
    }
}

struct Tr<'a> {
    a: &'a Pt,
}

impl<'a> Tr<'a> {
    fn new(a: &'a Pt) -> Self {
        Self { a }
    }
}

// Here we use std::ptr::eq to compare the *addresses* of `self.a` and `other.a`
impl<'a> PartialEq for Tr<'a> {
    fn eq(&self, other: &Tr<'a>) -> bool {
        std::ptr::eq(self.a, other.a)
    }
}

fn main() {
    let tr_base1 = Pt::new(0.0, 0.0);
    let tr_base2 = Pt::new(0.0, 0.0);
    assert!(tr_base1 == tr_base2);

    let tr1 = Tr::new(&tr_base1);
    let tr2 = Tr::new(&tr_base2);
    let tr3 = Tr::new(&tr_base1);

    assert!(tr1 == tr3);
    assert!(tr1.a == tr2.a);
    assert!(tr1 != tr2);
}

//此派生将使用基础字段的相等性
#[衍生（部分）]
结构Pt{
x:f32，
y:f32，
}
impl Pt{
fn新（x:f32，y:f32）->自{
自{x，y}
}
}
结构Tr{
fn新（a:&'a Pt）->自{
自我{a}
}
}
//这里我们使用std:：ptr:：eq来比较'self.a'和'other.a'的*地址*`
恳求{
fn情商和自我，其他：&Tr
// This derive will use the equality of the underlying fields
#[derive(PartialEq)]
struct Pt {
    x: f32,
    y: f32,
}

impl Pt {
    fn new(x: f32, y: f32) -> Self {
        Self { x, y }
    }
}

struct Tr<'a> {
    a: &'a Pt,
}

impl<'a> Tr<'a> {
    fn new(a: &'a Pt) -> Self {
        Self { a }
    }
}

// Here we use std::ptr::eq to compare the *addresses* of `self.a` and `other.a`
impl<'a> PartialEq for Tr<'a> {
    fn eq(&self, other: &Tr<'a>) -> bool {
        std::ptr::eq(self.a, other.a)
    }
}

fn main() {
    let tr_base1 = Pt::new(0.0, 0.0);
    let tr_base2 = Pt::new(0.0, 0.0);
    assert!(tr_base1 == tr_base2);

    let tr1 = Tr::new(&tr_base1);
    let tr2 = Tr::new(&tr_base2);
    let tr3 = Tr::new(&tr_base1);

    assert!(tr1 == tr3);
    assert!(tr1.a == tr2.a);
    assert!(tr1 != tr2);
}