versatile-data 0.86.1

A library for databases that has convenient datasets that group together commonly used fields and gives you the flexibility to create your own fields.
Documentation 
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use idx_binary::IdxFile;
use std::path::PathBuf;

use crate::RowFragment;

pub(crate) struct SerialNumber {
    index: IdxFile<u32>,
    fragment: RowFragment,
}
impl std::ops::Deref for SerialNumber {
    type Target = IdxFile<u32>;
    fn deref(&self) -> &Self::Target {
        &self.index
    }
}
impl SerialNumber {
    pub fn new(path: PathBuf) -> Self {
        let file_name = path.file_name().map_or("".into(), |f| f.to_string_lossy());
        SerialNumber {
            index: IdxFile::new({
                let mut path = path.clone();
                path.set_file_name(&(file_name.to_string() + ".i"));
                path
            }),
            fragment: RowFragment::new({
                let mut path = path.clone();
                path.set_file_name(&(file_name.into_owned() + ".f"));
                path
            }),
        }
    }
    pub fn delete(&mut self, row: u32) -> u64 {
        self.index.delete(row);
        self.fragment.insert_blank(row)
    }
    pub fn next_row(&mut self) -> u32 {
        let row = self.index.new_row(self.fragment.pop().unwrap_or(0));
        self.index.update(row, self.fragment.serial_increment())
    }
}