Module malachite_base::num::arithmetic::log_base_power_of_2

Traits for taking the base-$2^k$ logarithm of a number.

The traits are FloorLogBasePowerOf2, CeilingLogBasePowerOf2, and CheckedLogBasePowerOf2.

floor_log_base_power_of_2

use malachite_base::num::arithmetic::traits::FloorLogBasePowerOf2;

assert_eq!(1u8.floor_log_base_power_of_2(4), 0);
assert_eq!(100u64.floor_log_base_power_of_2(2), 3);

assert_eq!(0.1f32.floor_log_base_power_of_2(2), -2);

ceiling_log_base_power_of_2

use malachite_base::num::arithmetic::traits::CeilingLogBasePowerOf2;

assert_eq!(1u8.ceiling_log_base_power_of_2(4), 0);
assert_eq!(100u64.ceiling_log_base_power_of_2(2), 4);

assert_eq!(0.1f32.ceiling_log_base_power_of_2(2), -1);

checked_log_base_power_of_2

use malachite_base::num::arithmetic::traits::CheckedLogBasePowerOf2;

assert_eq!(1u8.checked_log_base_power_of_2(4), Some(0));
assert_eq!(100u64.checked_log_base_power_of_2(4), None);
assert_eq!(256u64.checked_log_base_power_of_2(4), Some(2));

assert_eq!(0.1f32.checked_log_base_power_of_2(2), None);
assert_eq!(0.0625f32.checked_log_base_power_of_2(2), Some(-2));