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use super::types::Sign;
use super::zeroable::Zeroable;
use core::cmp::Ordering;
pub trait Signed: Zeroable {
/// Checks if a number is negative.
/// ```
/// use traiter::numbers::Signed;
/// // signed integers
/// assert!(Signed::is_negative(-1i8));
/// assert!(!Signed::is_negative(0i8));
/// assert!(!Signed::is_negative(1i8));
/// ```
fn is_negative(self) -> bool;
/// Checks if a number is positive.
/// ```
/// use traiter::numbers::Signed;
/// // signed integers
/// assert!(!Signed::is_positive(-1i8));
/// assert!(!Signed::is_positive(0i8));
/// assert!(Signed::is_positive(1i8));
/// ```
fn is_positive(self) -> bool;
/// Returns sign of a number.
/// ```
/// use traiter::numbers::{Signed, Sign};
/// // signed integers
/// assert_eq!(Signed::sign(-1i8), Sign::Negative);
/// assert_eq!(Signed::sign(0i8), Sign::Zero);
/// assert_eq!(Signed::sign(1i8), Sign::Positive);
/// ```
fn sign(self) -> Sign;
}
macro_rules! signed_integer_impl {
($($integer:ty)*) => ($(
impl Signed for $integer {
#[inline(always)]
fn is_negative(self) -> bool {
<$integer>::is_negative(self)
}
#[inline(always)]
fn is_positive(self) -> bool {
<$integer>::is_positive(self)
}
#[inline(always)]
fn sign(self) -> Sign {
match self.cmp(&(0 as $integer)) {
Ordering::Equal => Sign::Zero,
Ordering::Greater => Sign::Positive,
Ordering::Less => Sign::Negative,
}
}
}
impl Signed for &$integer {
#[inline(always)]
fn is_negative(self) -> bool {
<$integer>::is_negative(*self)
}
#[inline(always)]
fn is_positive(self) -> bool {
<$integer>::is_positive(*self)
}
#[inline(always)]
fn sign(self) -> Sign {
match self.cmp(&(0 as $integer)) {
Ordering::Equal => Sign::Zero,
Ordering::Greater => Sign::Positive,
Ordering::Less => Sign::Negative,
}
}
}
)*)
}
signed_integer_impl!(i8 i16 i32 i64 i128 isize);