Trait BitTest 

pub trait BitTest {
    // Required methods
    fn bit_len(&self) -> usize;
    fn bit(&self, n: usize) -> bool;
}

Bit query for integers

Examples

// query a bit of the number
assert_eq!(0b10010.bit(1), true);
assert_eq!(0b10010.bit(3), false);
assert_eq!(0b10010.bit(100), false);
assert_eq!((-0b10010).bit(1), true);
assert_eq!((-0b10010).bit(3), true);
assert_eq!((-0b10010).bit(100), true);

// query the bit length of the number
assert_eq!(0.bit_len(), 0);
assert_eq!(17.bit_len(), 5);
assert_eq!((-17).bit_len(), 5);
assert_eq!(0b101000000.bit_len(), 9);

Required Methods

fn bit_len(&self) -> usize

Effective bit length of the binary representation.

For 0, the length is 0.

For positive numbers it is:

• number of digits in base 2
• the index of the top 1 bit plus one
• the floored base-2 logarithm of the number plus one.

For negative numbers it is:

• number of digits in base 2 without the sign
• the index of the top 0 bit plus one
• the floored base-2 logarithm of the absolute value of the number plus one.

fn bit(&self, n: usize) -> bool

Returns true if the n-th bit is set in its two’s complement binary representation, n starts from 0.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl BitTest for i8

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for i16

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for i32

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for i64

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for i128

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for isize

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for u8

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for u16

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for u32

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for u64

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for u128

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

impl BitTest for usize

fn bit_len(&self) -> usize

fn bit(&self, position: usize) -> bool

Implementors