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// Copyright © 2026 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.
use crate::gaussian_rational::GaussianRational;
use core::ops::{Shr, ShrAssign};
macro_rules! impl_shr_unsigned {
($t:ident) => {
impl Shr<$t> for GaussianRational {
type Output = GaussianRational;
/// Right-shifts a [`GaussianRational`] (divides it by a power of 2), taking it by
/// value. Both parts are shifted.
///
/// $$
/// f(x, k) = x2^{-k}.
/// $$
///
/// # Worst-case complexity
/// $T(n, m) = O(n + m)$
///
/// $M(n, m) = O(n + m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is the maximum number of
/// significant bits of the real and imaginary parts of `self`, and $m$ is `bits`.
///
/// # Examples
/// See [here](super::shr#shr).
#[inline]
fn shr(self, bits: $t) -> GaussianRational {
GaussianRational {
real: self.real >> bits,
imaginary: self.imaginary >> bits,
}
}
}
impl Shr<$t> for &GaussianRational {
type Output = GaussianRational;
/// Right-shifts a [`GaussianRational`] (divides it by a power of 2), taking it by
/// reference. Both parts are shifted.
///
/// $$
/// f(x, k) = x2^{-k}.
/// $$
///
/// # Worst-case complexity
/// $T(n, m) = O(n + m)$
///
/// $M(n, m) = O(n + m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is the maximum number of
/// significant bits of the real and imaginary parts of `self`, and $m$ is `bits`.
///
/// # Examples
/// See [here](super::shr#shr).
#[inline]
fn shr(self, bits: $t) -> GaussianRational {
GaussianRational {
real: &self.real >> bits,
imaginary: &self.imaginary >> bits,
}
}
}
impl ShrAssign<$t> for GaussianRational {
/// Right-shifts a [`GaussianRational`] (divides it by a power of 2), in place. Both
/// parts are shifted.
///
/// $$
/// x \gets x2^{-k}.
/// $$
///
/// # Worst-case complexity
/// $T(n, m) = O(n + m)$
///
/// $M(n, m) = O(n + m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is the maximum number of
/// significant bits of the real and imaginary parts of `self`, and $m$ is `bits`.
///
/// # Examples
/// See [here](super::shr#shr_assign).
#[inline]
fn shr_assign(&mut self, bits: $t) {
self.real >>= bits;
self.imaginary >>= bits;
}
}
};
}
apply_to_unsigneds!(impl_shr_unsigned);
macro_rules! impl_shr_signed {
($t:ident) => {
impl Shr<$t> for GaussianRational {
type Output = GaussianRational;
/// Right-shifts a [`GaussianRational`] (divides it or multiplies it by a power of 2),
/// taking it by value. Both parts are shifted.
///
/// $$
/// f(x, k) = x2^{-k}.
/// $$
///
/// # Worst-case complexity
/// $T(n, m) = O(n + m)$
///
/// $M(n, m) = O(n + m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is the maximum number of
/// significant bits of the real and imaginary parts of `self`, and $m$ is `max(-bits,
/// 0)`.
///
/// # Examples
/// See [here](super::shr#shr).
#[inline]
fn shr(self, bits: $t) -> GaussianRational {
GaussianRational {
real: self.real >> bits,
imaginary: self.imaginary >> bits,
}
}
}
impl Shr<$t> for &GaussianRational {
type Output = GaussianRational;
/// Right-shifts a [`GaussianRational`] (divides it or multiplies it by a power of 2),
/// taking it by reference. Both parts are shifted.
///
/// $$
/// f(x, k) = x2^{-k}.
/// $$
///
/// # Worst-case complexity
/// $T(n, m) = O(n + m)$
///
/// $M(n, m) = O(n + m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is the maximum number of
/// significant bits of the real and imaginary parts of `self`, and $m$ is `max(-bits,
/// 0)`.
///
/// # Examples
/// See [here](super::shr#shr).
#[inline]
fn shr(self, bits: $t) -> GaussianRational {
GaussianRational {
real: &self.real >> bits,
imaginary: &self.imaginary >> bits,
}
}
}
impl ShrAssign<$t> for GaussianRational {
/// Right-shifts a [`GaussianRational`] (divides it or multiplies it by a power of 2),
/// in place. Both parts are shifted.
///
/// $$
/// x \gets x2^{-k}.
/// $$
///
/// # Worst-case complexity
/// $T(n, m) = O(n + m)$
///
/// $M(n, m) = O(n + m)$
///
/// where $T$ is time, $M$ is additional memory, $n$ is the maximum number of
/// significant bits of the real and imaginary parts of `self`, and $m$ is `max(-bits,
/// 0)`.
///
/// # Examples
/// See [here](super::shr#shr_assign).
#[inline]
fn shr_assign(&mut self, bits: $t) {
self.real >>= bits;
self.imaginary >>= bits;
}
}
};
}
apply_to_signeds!(impl_shr_signed);