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use std::cell::Cell;
use std::mem::MaybeUninit;
use crate::math_cell::MathCell;
/// A producer element that can be assigned to once
pub trait AssignElem<T>
{
/// Assign the value `input` to the element that self represents.
fn assign_elem(self, input: T);
}
/// Assignable element, simply `*self = input`.
impl<T> AssignElem<T> for &mut T
{
fn assign_elem(self, input: T)
{
*self = input;
}
}
/// Assignable element, simply `self.set(input)`.
impl<T> AssignElem<T> for &Cell<T>
{
fn assign_elem(self, input: T)
{
self.set(input);
}
}
/// Assignable element, simply `self.set(input)`.
impl<T> AssignElem<T> for &MathCell<T>
{
fn assign_elem(self, input: T)
{
self.set(input);
}
}
/// Assignable element, the item in the MaybeUninit is overwritten (prior value, if any, is not
/// read or dropped).
impl<T> AssignElem<T> for &mut MaybeUninit<T>
{
fn assign_elem(self, input: T)
{
*self = MaybeUninit::new(input);
}
}