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use crate::numeric::num::Num;
use std::ops::Neg;
pub trait Signed: Sized + Num + Neg<Output = Self> {
fn abs(&self) -> Self;
fn abs_sub(&self, rhs: &Self) -> Self;
fn signum(&self) -> Self;
fn is_positive(&self) -> bool;
fn is_negative(&self) -> bool;
}
macro_rules! impl_signed_int {
($($t:ty)*) => {
$(
impl Signed for $t {
#[inline]
fn abs(&self) -> Self {
<$t>::abs(*self)
}
#[inline]
fn abs_sub(&self, rhs: &Self) -> Self {
if *self <= *rhs {
0
} else {
*self - *rhs
}
}
#[inline]
fn signum(&self) -> Self {
<$t>::signum(*self)
}
#[inline]
fn is_positive(&self) -> bool {
<$t>::is_positive(*self)
}
#[inline]
fn is_negative(&self) -> bool {
<$t>::is_positive(*self)
}
}
)*
}
}
macro_rules! impl_signed_float {
($($t:ty)*) => {
$(
impl Signed for $t {
#[inline]
fn abs(&self) -> Self {
<$t>::abs(*self)
}
#[inline]
fn abs_sub(&self, rhs: &Self) -> Self {
if *self <= *rhs {
0.0
} else {
*self - *rhs
}
}
#[inline]
fn signum(&self) -> Self {
<$t>::signum(*self)
}
#[inline]
fn is_positive(&self) -> bool {
<$t>::is_sign_positive(*self)
}
#[inline]
fn is_negative(&self) -> bool {
<$t>::is_sign_positive(*self)
}
}
)*
}
}
impl_signed_int!(isize i8 i16 i32 i64 i128);
impl_signed_float!(f32 f64);