Struct SmallCharSet

pub struct SmallCharSet {
    pub bits: u64,
}

Represents a set of “small characters”, those with Unicode scalar values less than 64.

This is stored as a bitmap, with 1 bit for each value.

Fields

bits: u64

Implementations

impl SmallCharSet

pub fn nonmember_prefix_len(&self, buf: &str) -> u32

Count the number of bytes of characters at the beginning of buf which are not in the set.

This functionality is used in BufferQueue::pop_except_from.

Examples

let set = small_char_set!(48 49 50); // '0' '1' '2'
// `test` is 4 chars, 😁 is 4 chars, then we meet a character in the set
let test_str = "test😁01232afd";
assert_eq!(set.nonmember_prefix_len(test_str), 8);

Trait Implementations

impl Clone for SmallCharSet

fn clone(&self) -> SmallCharSet

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SmallCharSet

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Hash for SmallCharSet

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for SmallCharSet

fn eq(&self, other: &SmallCharSet) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SmallCharSet

impl Eq for SmallCharSet

impl StructuralPartialEq for SmallCharSet