use malachite_base::num::basic::floats::PrimitiveFloat;
use malachite_base::num::basic::integers::PrimitiveInt;
use malachite_base::num::basic::signeds::PrimitiveSigned;
use malachite_base::num::basic::unsigneds::PrimitiveUnsigned;
use malachite_base::test_util::generators::{
signed_gen_var_11, unsigned_gen_var_15, unsigned_gen_var_16,
};
use std::panic::catch_unwind;
fn power_of_2_primitive_int_helper<T: PrimitiveInt>() {
let test = |pow, out| {
assert_eq!(T::power_of_2(pow), out);
};
test(0, T::ONE);
test(1, T::TWO);
test(2, T::exact_from(4));
test(3, T::exact_from(8));
}
fn power_of_2_unsigned_helper<T: PrimitiveUnsigned>() {
let test = |pow, out| {
assert_eq!(T::power_of_2(pow), out);
};
test(T::WIDTH - 1, T::ONE << (T::WIDTH - 1));
}
fn power_of_2_primitive_float_helper<T: PrimitiveFloat>() {
let test = |pow, out| {
assert_eq!(T::power_of_2(pow), out);
};
test(0, T::ONE);
test(1, T::TWO);
test(-1, T::from(0.5f32));
test(2, T::from(4.0f32));
test(-2, T::from(0.25f32));
test(T::MIN_EXPONENT, T::MIN_POSITIVE_SUBNORMAL);
}
#[test]
fn test_power_of_2() {
apply_fn_to_primitive_ints!(power_of_2_primitive_int_helper);
apply_fn_to_unsigneds!(power_of_2_unsigned_helper);
apply_fn_to_primitive_floats!(power_of_2_primitive_float_helper);
}
fn power_of_2_unsigned_fail_helper<T: PrimitiveUnsigned>() {
assert_panic!(T::power_of_2(T::WIDTH));
}
fn power_of_2_signed_fail_helper<T: PrimitiveSigned>() {
assert_panic!(T::power_of_2(T::WIDTH - 1));
}
fn power_of_2_primitive_float_fail_helper<T: PrimitiveFloat>() {
assert_panic!(T::power_of_2(T::MAX_EXPONENT + 1));
assert_panic!(T::power_of_2(T::MIN_EXPONENT - 1));
assert_panic!(T::power_of_2(10000));
assert_panic!(T::power_of_2(-10000));
}
#[test]
fn power_of_2_fail() {
apply_fn_to_unsigneds!(power_of_2_unsigned_fail_helper);
apply_fn_to_signeds!(power_of_2_signed_fail_helper);
apply_fn_to_primitive_floats!(power_of_2_primitive_float_fail_helper);
}
fn power_of_2_properties_helper_unsigned<T: PrimitiveUnsigned>() {
unsigned_gen_var_15::<T>().test_properties(|pow| {
let mut n = T::power_of_2(pow);
assert_eq!(n.checked_log_base_2(), Some(pow));
assert!(n.is_power_of_2());
n.clear_bit(pow);
assert_eq!(n, T::ZERO);
});
}
fn power_of_2_properties_helper_signed<U: TryFrom<S> + PrimitiveUnsigned, S: PrimitiveSigned>() {
unsigned_gen_var_16::<S>().test_properties(|pow| {
let mut n = S::power_of_2(pow);
assert_eq!(U::exact_from(n), U::power_of_2(pow));
n.clear_bit(pow);
assert_eq!(n, S::ZERO);
});
}
fn power_of_2_properties_helper_primitive_float<T: PrimitiveFloat>() {
signed_gen_var_11::<T>().test_properties(|pow| {
let n = T::power_of_2(pow);
assert!(n > T::ZERO);
assert!(n.is_power_of_2());
});
}
#[test]
fn power_of_2_properties() {
apply_fn_to_unsigneds!(power_of_2_properties_helper_unsigned);
apply_fn_to_unsigned_signed_pairs!(power_of_2_properties_helper_signed);
apply_fn_to_primitive_floats!(power_of_2_properties_helper_primitive_float);
}