Function lexicon_fractional_index::key_between[][src]

pub fn key_between(
    a: &Option<String>,
    b: &Option<String>
) -> Result<String, String>
Expand description

key_between returns a key that sorts lexicographically between a and b. Either a or b can be empty strings. If a is empty it indicates smallest key, If b is empty it indicates largest key. b must be empty string or > a.