Trait leveldb::database::comparator::Comparator

pub trait Comparator {
    type K: Key;
    fn name(&self) -> *const c_char;
    fn compare(&self, a: &Self::K, b: &Self::K) -> Ordering;

    fn null() -> bool { ... }
}

A comparator has two important functions:

• the name function returns a fixed name to detect errors when opening databases with a different name
• The comparison implementation

Associated Types

type K: Key

The type that the comparator compares.

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Required methods

fn name(&self) -> *const c_char

Return the name of the Comparator

fn compare(&self, a: &Self::K, b: &Self::K) -> Ordering

compare two keys. This must implement a total ordering.

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Provided methods

fn null() -> bool

whether the comparator is the DefaultComparator

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Implementors

impl Comparator for DefaultComparator

type K = i32

fn name(&self) -> *const c_char

fn compare(&self, _a: &i32, _b: &i32) -> Ordering

fn null() -> bool

impl<K: Key + Ord> Comparator for OrdComparator<K>

type K = K

fn name(&self) -> *const c_char

fn compare(&self, a: &K, b: &K) -> Ordering

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