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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::Float;
use malachite_base::num::conversion::traits::ConvertibleFrom;
use malachite_q::Rational;
use malachite_q::gaussian_rational::GaussianRational;
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct GaussianRationalFromFloatError;
impl TryFrom<Float> for GaussianRational {
type Error = GaussianRationalFromFloatError;
/// Converts a [`Float`] to a [`GaussianRational`], producing a purely real value and taking the
/// [`Float`] by value. If the [`Float`] is NaN or infinite, an error is returned.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `x.significant_bits()`.
///
/// # Examples
/// ```
/// use malachite_base::num::basic::traits::{Infinity, NaN};
/// use malachite_float::Float;
/// use malachite_float::float::conversion::gaussian_rational_from_float::*;
/// use malachite_q::gaussian_rational::GaussianRational;
///
/// let x = Float::from(123);
/// assert_eq!(GaussianRational::try_from(x).unwrap().to_string(), "123");
///
/// let x = Float::from(1.5);
/// assert_eq!(GaussianRational::try_from(x).unwrap().to_string(), "3/2");
///
/// assert_eq!(
/// GaussianRational::try_from(Float::NAN),
/// Err(GaussianRationalFromFloatError)
/// );
/// assert_eq!(
/// GaussianRational::try_from(Float::INFINITY),
/// Err(GaussianRationalFromFloatError)
/// );
/// ```
#[inline]
fn try_from(x: Float) -> Result<Self, Self::Error> {
Rational::try_from(x)
.map(Self::from)
.map_err(|_| GaussianRationalFromFloatError)
}
}
impl TryFrom<&Float> for GaussianRational {
type Error = GaussianRationalFromFloatError;
/// Converts a [`Float`] to a [`GaussianRational`], producing a purely real value and taking the
/// [`Float`] by reference. If the [`Float`] is NaN or infinite, an error is returned.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `x.significant_bits()`.
///
/// # Examples
/// ```
/// use malachite_base::num::basic::traits::{Infinity, NaN};
/// use malachite_float::Float;
/// use malachite_float::float::conversion::gaussian_rational_from_float::*;
/// use malachite_q::gaussian_rational::GaussianRational;
///
/// let x = Float::from(123);
/// assert_eq!(GaussianRational::try_from(&x).unwrap().to_string(), "123");
///
/// let x = Float::from(1.5);
/// assert_eq!(GaussianRational::try_from(&x).unwrap().to_string(), "3/2");
///
/// assert_eq!(
/// GaussianRational::try_from(&Float::NAN),
/// Err(GaussianRationalFromFloatError)
/// );
/// assert_eq!(
/// GaussianRational::try_from(&Float::INFINITY),
/// Err(GaussianRationalFromFloatError)
/// );
/// ```
#[inline]
fn try_from(x: &Float) -> Result<Self, Self::Error> {
Rational::try_from(x)
.map(Self::from)
.map_err(|_| GaussianRationalFromFloatError)
}
}
impl ConvertibleFrom<&Float> for GaussianRational {
/// Determines whether a [`Float`] can be converted to a [`GaussianRational`] (that is, whether
/// it is finite), taking the [`Float`] by reference.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// ```
/// use malachite_base::num::basic::traits::{Infinity, NaN};
/// use malachite_base::num::conversion::traits::ConvertibleFrom;
/// use malachite_float::Float;
/// use malachite_q::gaussian_rational::GaussianRational;
///
/// assert_eq!(GaussianRational::convertible_from(&Float::from(123)), true);
/// assert_eq!(GaussianRational::convertible_from(&Float::from(1.5)), true);
/// assert_eq!(GaussianRational::convertible_from(&Float::NAN), false);
/// assert_eq!(GaussianRational::convertible_from(&Float::INFINITY), false);
/// ```
#[inline]
fn convertible_from(x: &Float) -> bool {
Rational::convertible_from(x)
}
}