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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::num::arithmetic::traits::IsUnit;
macro_rules! impl_is_unit_unsigned {
($t:ident) => {
impl IsUnit for $t {
/// Determines whether a number is a unit: whether it is 1, the only unsigned integer
/// with a multiplicative inverse.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// See [here](super::is_unit#is_unit).
#[inline]
fn is_unit(&self) -> bool {
*self == 1
}
}
};
}
apply_to_unsigneds!(impl_is_unit_unsigned);
macro_rules! impl_is_unit_signed {
($t:ident) => {
impl IsUnit for $t {
/// Determines whether a number is a unit: whether it is 1 or $-1$, the only integers
/// with a multiplicative inverse.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// See [here](super::is_unit#is_unit).
#[inline]
fn is_unit(&self) -> bool {
*self == 1 || *self == -1
}
}
};
}
apply_to_signeds!(impl_is_unit_signed);
macro_rules! impl_is_unit_primitive_float {
($t:ident) => {
impl IsUnit for $t {
/// Determines whether a number is a unit: whether it is finite and nonzero, so that it
/// has a multiplicative inverse. NaN and the infinities are not units.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// See [here](super::is_unit#is_unit).
#[inline]
fn is_unit(&self) -> bool {
self.is_finite() && *self != 0.0
}
}
};
}
apply_to_primitive_floats!(impl_is_unit_primitive_float);