use crate::num::arithmetic::traits::{OverflowingSub, OverflowingSubAssign};
macro_rules! impl_overflowing_sub {
($t:ident) => {
impl OverflowingSub<$t> for $t {
type Output = $t;
/// This is a wrapper over the `overflowing_sub` functions in the standard library, for
/// example [this one](u32::overflowing_sub).
#[inline]
fn overflowing_sub(self, other: $t) -> ($t, bool) {
$t::overflowing_sub(self, other)
}
}
impl OverflowingSubAssign<$t> for $t {
/// Subtracts a number by another number, in place.
///
/// Returns a boolean indicating whether an arithmetic overflow occurred. If an overflow
/// occurred, then the wrapped value is assigned.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// See [here](super::overflowing_sub#overflowing_sub_assign).
#[inline]
fn overflowing_sub_assign(&mut self, other: $t) -> bool {
let overflow;
(*self, overflow) = self.overflowing_sub(other);
overflow
}
}
};
}
apply_to_primitive_ints!(impl_overflowing_sub);