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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_nz::gaussian_integer::GaussianInteger;
use malachite_nz::integer::Integer;
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct GaussianIntegerFromFloatError;
impl TryFrom<Float> for GaussianInteger {
type Error = GaussianIntegerFromFloatError;
/// Converts a [`Float`] to a [`GaussianInteger`], producing a purely real value and taking the
/// [`Float`] by value. If the [`Float`] is NaN, infinite, or not an integer, 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_integer_from_float::*;
/// use malachite_nz::gaussian_integer::GaussianInteger;
///
/// let x = Float::from(123);
/// assert_eq!(GaussianInteger::try_from(x).unwrap().to_string(), "123");
///
/// let x = Float::from(-123);
/// assert_eq!(GaussianInteger::try_from(x).unwrap().to_string(), "-123");
///
/// assert_eq!(
/// GaussianInteger::try_from(Float::from(1.5)),
/// Err(GaussianIntegerFromFloatError)
/// );
/// assert_eq!(
/// GaussianInteger::try_from(Float::NAN),
/// Err(GaussianIntegerFromFloatError)
/// );
/// assert_eq!(
/// GaussianInteger::try_from(Float::INFINITY),
/// Err(GaussianIntegerFromFloatError)
/// );
/// ```
#[inline]
fn try_from(x: Float) -> Result<Self, Self::Error> {
Integer::try_from(x)
.map(Self::from)
.map_err(|_| GaussianIntegerFromFloatError)
}
}
impl TryFrom<&Float> for GaussianInteger {
type Error = GaussianIntegerFromFloatError;
/// Converts a [`Float`] to a [`GaussianInteger`], producing a purely real value and taking the
/// [`Float`] by reference. If the [`Float`] is NaN, infinite, or not an integer, 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_integer_from_float::*;
/// use malachite_nz::gaussian_integer::GaussianInteger;
///
/// let x = Float::from(123);
/// assert_eq!(GaussianInteger::try_from(&x).unwrap().to_string(), "123");
///
/// let x = Float::from(-123);
/// assert_eq!(GaussianInteger::try_from(&x).unwrap().to_string(), "-123");
///
/// assert_eq!(
/// GaussianInteger::try_from(&Float::from(1.5)),
/// Err(GaussianIntegerFromFloatError)
/// );
/// assert_eq!(
/// GaussianInteger::try_from(&Float::NAN),
/// Err(GaussianIntegerFromFloatError)
/// );
/// assert_eq!(
/// GaussianInteger::try_from(&Float::INFINITY),
/// Err(GaussianIntegerFromFloatError)
/// );
/// ```
#[inline]
fn try_from(x: &Float) -> Result<Self, Self::Error> {
Integer::try_from(x)
.map(Self::from)
.map_err(|_| GaussianIntegerFromFloatError)
}
}
impl ConvertibleFrom<&Float> for GaussianInteger {
/// Determines whether a [`Float`] can be converted to a [`GaussianInteger`] (that is, whether
/// it is finite and an integer), taking the [`Float`] by reference.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(1)$
///
/// 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_base::num::conversion::traits::ConvertibleFrom;
/// use malachite_float::Float;
/// use malachite_nz::gaussian_integer::GaussianInteger;
///
/// assert_eq!(GaussianInteger::convertible_from(&Float::from(123)), true);
/// assert_eq!(GaussianInteger::convertible_from(&Float::from(-123)), true);
/// assert_eq!(GaussianInteger::convertible_from(&Float::from(1.5)), false);
/// assert_eq!(GaussianInteger::convertible_from(&Float::NAN), false);
/// assert_eq!(GaussianInteger::convertible_from(&Float::INFINITY), false);
/// ```
#[inline]
fn convertible_from(x: &Float) -> bool {
Integer::convertible_from(x)
}
}