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FEAT: Add MathCell, a wrapper for std Cell
This will be used so that we can implement arithmetic ops for the views with cells in them and for cells.
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use std::cell::Cell; | ||
use std::cmp::Ordering; | ||
use std::fmt; | ||
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use std::ops::{Deref, DerefMut}; | ||
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/// A transparent wrapper of [`Cell<T>`](std::cell::Cell) which is identical in every way, except | ||
/// it will implement arithmetic operators as well. | ||
/// | ||
/// The purpose of `MathCell` is to be used from [.cell_view()](crate::ArrayBase::cell_view). | ||
/// The `MathCell` derefs to `Cell`, so all the cell's methods are available. | ||
#[repr(transparent)] | ||
#[derive(Default)] | ||
pub struct MathCell<T>(Cell<T>); | ||
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impl<T> MathCell<T> { | ||
/// Create a new cell with the given value | ||
#[inline(always)] | ||
pub const fn new(value: T) -> Self { MathCell(Cell::new(value)) } | ||
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/// Return the inner value | ||
pub fn into_inner(self) -> T { Cell::into_inner(self.0) } | ||
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/// Swap value with another cell | ||
pub fn swap(&self, other: &Self) { | ||
Cell::swap(&self.0, &other.0) | ||
} | ||
} | ||
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impl<T> Deref for MathCell<T> { | ||
type Target = Cell<T>; | ||
#[inline(always)] | ||
fn deref(&self) -> &Self::Target { &self.0 } | ||
} | ||
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impl<T> DerefMut for MathCell<T> { | ||
#[inline(always)] | ||
fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0 } | ||
} | ||
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impl<T> Clone for MathCell<T> | ||
where T: Copy | ||
{ | ||
fn clone(&self) -> Self { | ||
MathCell::new(self.get()) | ||
} | ||
} | ||
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impl<T> PartialEq for MathCell<T> | ||
where T: Copy + PartialEq | ||
{ | ||
fn eq(&self, rhs: &Self) -> bool { | ||
self.get() == rhs.get() | ||
} | ||
} | ||
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impl<T> Eq for MathCell<T> | ||
where T: Copy + Eq | ||
{ } | ||
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impl<T> PartialOrd for MathCell<T> | ||
where T: Copy + PartialOrd | ||
{ | ||
fn partial_cmp(&self, rhs: &Self) -> Option<Ordering> { | ||
self.get().partial_cmp(&rhs.get()) | ||
} | ||
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fn lt(&self, rhs: &Self) -> bool { self.get().lt(&rhs.get()) } | ||
fn le(&self, rhs: &Self) -> bool { self.get().le(&rhs.get()) } | ||
fn gt(&self, rhs: &Self) -> bool { self.get().gt(&rhs.get()) } | ||
fn ge(&self, rhs: &Self) -> bool { self.get().ge(&rhs.get()) } | ||
} | ||
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impl<T> Ord for MathCell<T> | ||
where T: Copy + Ord | ||
{ | ||
fn cmp(&self, rhs: &Self) -> Ordering { | ||
self.get().cmp(&rhs.get()) | ||
} | ||
} | ||
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impl<T> fmt::Debug for MathCell<T> | ||
where T: Copy + fmt::Debug | ||
{ | ||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
self.get().fmt(f) | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use super::MathCell; | ||
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#[test] | ||
fn test_basic() { | ||
let c = &MathCell::new(0); | ||
c.set(1); | ||
assert_eq!(c.get(), 1); | ||
} | ||
} |