use std::{    cmp::Ordering,    ops::{Add, AddAssign, Sub},}; #[derive(Clone, Copy, Default, Eq, PartialEq, Debug, Hash)]pub struct PointUtf16 {    pub row: u32,    pub column: u32,} impl PointUtf16 {    pub const MAX: Self = Self {        row: u32::MAX,        column: u32::MAX,    };     pub fn new(row: u32, column: u32) -> Self {        PointUtf16 { row, column }    }     pub fn zero() -> Self {        PointUtf16::new(0, 0)    }     pub fn is_zero(&self) -> bool {        self.row == 0 && self.column == 0    }     pub fn saturating_sub(self, other: Self) -> Self {        if self < other {            Self::zero()        } else {            self - other        }    }} impl<'a> Add<&'a Self> for PointUtf16 {    type Output = PointUtf16;     fn add(self, other: &'a Self) -> Self::Output {        self + *other    }} impl Add for PointUtf16 {    type Output = PointUtf16;     fn add(self, other: Self) -> Self::Output {        if other.row == 0 {            PointUtf16::new(self.row, self.column + other.column)        } else {            PointUtf16::new(self.row + other.row, other.column)        }    }} impl<'a> Sub<&'a Self> for PointUtf16 {    type Output = PointUtf16;     fn sub(self, other: &'a Self) -> Self::Output {        self - *other    }} impl Sub for PointUtf16 {    type Output = PointUtf16;     fn sub(self, other: Self) -> Self::Output {        debug_assert!(other <= self);         if self.row == other.row {            PointUtf16::new(0, self.column - other.column)        } else {            PointUtf16::new(self.row - other.row, self.column)        }    }} impl<'a> AddAssign<&'a Self> for PointUtf16 {    fn add_assign(&mut self, other: &'a Self) {        *self += *other;    }} impl AddAssign<Self> for PointUtf16 {    fn add_assign(&mut self, other: Self) {        if other.row == 0 {            self.column += other.column;        } else {            self.row += other.row;            self.column = other.column;        }    }} impl PartialOrd for PointUtf16 {    fn partial_cmp(&self, other: &PointUtf16) -> Option<Ordering> {        Some(self.cmp(other))    }} impl Ord for PointUtf16 {    #[cfg(target_pointer_width = "64")]    fn cmp(&self, other: &PointUtf16) -> Ordering {        let a = ((self.row as usize) << 32) | self.column as usize;        let b = ((other.row as usize) << 32) | other.column as usize;        a.cmp(&b)    }     #[cfg(target_pointer_width = "32")]    fn cmp(&self, other: &PointUtf16) -> Ordering {        match self.row.cmp(&other.row) {            Ordering::Equal => self.column.cmp(&other.column),            comparison @ _ => comparison,        }    }}