// Copyright © 2024 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 .
use malachite_base::num::basic::unsigneds::PrimitiveUnsigned;
use malachite_base::test_util::generators::unsigned_pair_gen_var_17;
use std::panic::catch_unwind;
fn mod_power_of_2_neg_helper() {
let test = |n: T, pow, out| {
assert_eq!(n.mod_power_of_2_neg(pow), out);
let mut n = n;
n.mod_power_of_2_neg_assign(pow);
assert_eq!(n, out);
};
test(T::ZERO, 5, T::ZERO);
test(T::exact_from(10), 4, T::exact_from(6));
test(T::exact_from(100), 8, T::exact_from(156));
test(T::ONE, T::WIDTH, T::MAX);
test(T::MAX, T::WIDTH, T::ONE);
}
#[test]
fn test_mod_power_of_2_neg() {
apply_fn_to_unsigneds!(mod_power_of_2_neg_helper);
}
fn mod_power_of_2_neg_fail_helper() {
assert_panic!(T::ONE.mod_power_of_2_neg(0));
assert_panic!(T::from(200u8).mod_power_of_2_neg(7));
}
#[test]
fn mod_power_of_2_neg_fail() {
apply_fn_to_unsigneds!(mod_power_of_2_neg_fail_helper);
}
fn mod_power_of_2_neg_assign_fail_helper() {
assert_panic!({
let mut x = T::ONE;
x.mod_power_of_2_neg_assign(0);
});
assert_panic!({
let mut x = T::from(200u8);
x.mod_power_of_2_neg_assign(7);
});
}
#[test]
fn mod_power_of_2_neg_assign_fail() {
apply_fn_to_unsigneds!(mod_power_of_2_neg_assign_fail_helper);
}
fn mod_power_of_2_neg_properties_helper() {
unsigned_pair_gen_var_17::().test_properties(|(n, pow)| {
assert!(n.mod_power_of_2_is_reduced(pow));
let neg = n.mod_power_of_2_neg(pow);
assert!(neg.mod_power_of_2_is_reduced(pow));
let mut n_alt = n;
n_alt.mod_power_of_2_neg_assign(pow);
assert_eq!(n_alt, neg);
assert_eq!(neg, n.wrapping_neg().mod_power_of_2(pow));
assert_eq!(neg.mod_power_of_2_neg(pow), n);
assert_eq!(n.mod_power_of_2_add(neg, pow), T::ZERO);
assert_eq!(n == neg, n == T::ZERO || n == T::power_of_2(pow - 1));
});
}
#[test]
fn mod_power_of_2_neg_properties() {
apply_fn_to_unsigneds!(mod_power_of_2_neg_properties_helper);
}