use malachite_base::num::basic::floats::PrimitiveFloat;
use malachite_base::num::float::NiceFloat;
use malachite_base::test_util::generators::primitive_float_gen_var_10;
use std::panic::catch_unwind;
#[allow(clippy::approx_constant)]
#[test]
pub fn test_next_lower() {
fn test<T: PrimitiveFloat>(x: T, out: T) {
assert_eq!(NiceFloat(x.next_lower()), NiceFloat(out));
}
test::<f32>(-f32::MAX_FINITE, f32::NEGATIVE_INFINITY);
test::<f32>(-458.42188, -458.4219);
test::<f32>(-10.0, -10.000001);
test::<f32>(-core::f32::consts::PI, -3.141593);
test::<f32>(-1.0, -1.0000001);
test::<f32>(-0.1, -0.10000001);
test::<f32>(-f32::MIN_POSITIVE_NORMAL, -1.1754945e-38);
test::<f32>(-f32::MAX_SUBNORMAL, -f32::MIN_POSITIVE_NORMAL);
test::<f32>(-f32::MIN_POSITIVE_SUBNORMAL, -3.0e-45);
test::<f32>(-0.0, -f32::MIN_POSITIVE_SUBNORMAL);
test::<f32>(0.0, -0.0);
test::<f32>(f32::MIN_POSITIVE_SUBNORMAL, 0.0);
test::<f32>(f32::MAX_SUBNORMAL, 1.1754941e-38);
test::<f32>(f32::MIN_POSITIVE_NORMAL, f32::MAX_SUBNORMAL);
test::<f32>(0.1, 0.099999994);
test::<f32>(0.99999994, 0.9999999);
test::<f32>(1.0, 0.99999994);
test::<f32>(1.0000001, 1.0);
test::<f32>(3.1415925, 3.1415923);
test::<f32>(core::f32::consts::PI, 3.1415925);
test::<f32>(3.141593, core::f32::consts::PI);
test::<f32>(10.0, 9.999999);
test::<f32>(f32::MAX_FINITE, 3.4028233e38);
test::<f32>(f32::POSITIVE_INFINITY, f32::MAX_FINITE);
test::<f64>(-f64::MAX_FINITE, f64::NEGATIVE_INFINITY);
test::<f64>(-10.0, -10.000000000000002);
test::<f64>(-core::f64::consts::PI, -3.1415926535897936);
test::<f64>(-1.0, -1.0000000000000002);
test::<f64>(-0.1, -0.10000000000000002);
test::<f64>(-f64::MIN_POSITIVE_NORMAL, -2.225073858507202e-308);
test::<f64>(-f64::MAX_SUBNORMAL, -f64::MIN_POSITIVE_NORMAL);
test::<f64>(-f64::MIN_POSITIVE_SUBNORMAL, -1.0e-323);
test::<f64>(-0.0, -f64::MIN_POSITIVE_SUBNORMAL);
test::<f64>(0.0, -0.0);
test::<f64>(f64::MIN_POSITIVE_SUBNORMAL, 0.0);
test::<f64>(f64::MAX_SUBNORMAL, 2.2250738585072004e-308);
test::<f64>(f64::MIN_POSITIVE_NORMAL, f64::MAX_SUBNORMAL);
test::<f64>(1.9261352099337372e-256, 1.926135209933737e-256);
test::<f64>(0.1, 0.09999999999999999);
test::<f64>(0.9999999999999999, 0.9999999999999998);
test::<f64>(1.0, 0.9999999999999999);
test::<f64>(1.0000000000000002, 1.0);
test::<f64>(3.1415926535897927, 3.1415926535897922);
test::<f64>(core::f64::consts::PI, 3.1415926535897927);
test::<f64>(3.1415926535897936, core::f64::consts::PI);
test::<f64>(10.0, 9.999999999999998);
test::<f64>(f64::MAX_FINITE, 1.7976931348623155e308);
test::<f64>(f64::POSITIVE_INFINITY, f64::MAX_FINITE);
}
fn next_lower_fail_helper<T: PrimitiveFloat>() {
assert_panic!(T::NAN.next_lower());
assert_panic!(T::NEGATIVE_INFINITY.next_lower());
}
#[test]
pub fn next_lower_fail() {
apply_fn_to_primitive_floats!(next_lower_fail_helper);
}
fn next_lower_properties_helper<T: PrimitiveFloat>() {
primitive_float_gen_var_10::<T>().test_properties(|x| {
let y = x.next_lower();
assert_eq!(
x.to_ordered_representation() - 1,
y.to_ordered_representation()
);
assert_eq!(NiceFloat(y.next_higher()), NiceFloat(x));
});
}
#[test]
fn next_lower_properties() {
apply_fn_to_primitive_floats!(next_lower_properties_helper);
}