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pub trait Parity {
/// Checks if a number is even.
/// ```
/// use traiter::numbers::Parity;
/// // signed integers
/// assert!(!Parity::is_even(-1i8));
/// assert!(Parity::is_even(0i8));
/// assert!(!Parity::is_even(1i8));
/// // unsigned integers
/// assert!(Parity::is_even(0u8));
/// assert!(!Parity::is_even(1i8));
/// assert!(Parity::is_even(2i8));
/// ```
fn is_even(self) -> bool;
/// Checks if a number is odd.
/// ```
/// use traiter::numbers::Parity;
/// // signed integers
/// assert!(Parity::is_odd(-1i8));
/// assert!(!Parity::is_odd(0i8));
/// assert!(Parity::is_odd(1i8));
/// // unsigned integers
/// assert!(!Parity::is_odd(0u8));
/// assert!(Parity::is_odd(1i8));
/// assert!(!Parity::is_odd(2i8));
/// ```
fn is_odd(self) -> bool;
}
macro_rules! integer_parity_impl {
($($integer:ty)*) => ($(
impl Parity for $integer {
#[inline(always)]
fn is_even(self) -> bool {
self & 1 == 0
}
#[inline(always)]
fn is_odd(self) -> bool {
self & 1 == 1
}
}
impl Parity for &$integer {
#[inline(always)]
fn is_even(self) -> bool {
self & 1 == 0
}
#[inline(always)]
fn is_odd(self) -> bool {
self & 1 == 1
}
}
)*)
}
integer_parity_impl!(i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize);