Struct StringInterner 

pub struct StringInterner { /* private fields */ }

A string interner that deduplicates strings.

This is useful for reducing memory usage when many strings with the same content are created, such as account names and currencies in a large ledger.

Implementations

impl StringInterner

pub fn new() -> Self

Create a new empty interner.

pub fn with_capacity(capacity: usize) -> Self

Create an interner with pre-allocated capacity.

pub fn intern(&mut self, s: &str) -> InternedStr

Intern a string.

If the string already exists in the interner, returns a reference to the existing copy. Otherwise, stores the string and returns a reference to the new copy.

pub fn intern_with_status(&mut self, s: &str) -> (InternedStr, bool)

Intern a string, also returning whether it was newly inserted.

Equivalent to Self::intern but exposes the insertion bit without a second hash lookup. Useful for dedup-counting passes (see rustledger_loader::dedup) that previously called contains then intern — a redundant double lookup. Returns (interned, was_new).

pub fn intern_string(&mut self, s: String) -> InternedStr

Intern a string, taking ownership.

pub fn contains(&self, s: &str) -> bool

Check if a string is already interned.

pub fn len(&self) -> usize

Get the number of unique strings.

pub fn is_empty(&self) -> bool

Check if the interner is empty.

pub fn iter(&self) -> impl Iterator<Item = &str>

Get an iterator over all interned strings.

pub fn clear(&mut self)

Clear all interned strings.

Trait Implementations

impl Debug for StringInterner

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

Formats the value using the given formatter.

impl Default for StringInterner

fn default() -> StringInterner

Returns the “default value” for a type.