cartel-sqlite 0.29.0

SQLite driver for the dope runtime
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use crate::{row, runtime};
use std::{marker, mem, ops, slice};

pub(crate) type Arena<'owner> = &'owner mut runtime::raw::Span;

const _: () = assert!(mem::size_of::<Arena<'static>>() == mem::size_of::<usize>());

/// A fixed-arena collection whose row views borrow the issuing local runtime.
pub struct Rows<'arena, R: row::raw::Decode + 'arena> {
    rows: &'arena [R::Borrowed<'arena>],
    row: marker::PhantomData<fn() -> R>,
}

impl<'arena, R: row::raw::Decode + 'arena> Rows<'arena, R> {
    pub(crate) const fn new(rows: &'arena [R::Borrowed<'arena>]) -> Self {
        Self {
            rows,
            row: marker::PhantomData,
        }
    }

    pub fn as_slice(&self) -> &'arena [R::Borrowed<'arena>] {
        self.rows
    }

    pub fn len(&self) -> usize {
        self.rows.len()
    }

    pub fn is_empty(&self) -> bool {
        self.rows.is_empty()
    }

    pub fn iter(&self) -> slice::Iter<'arena, R::Borrowed<'arena>> {
        self.rows.iter()
    }
}

impl<'arena, R: row::raw::Decode + 'arena> ops::Deref for Rows<'arena, R> {
    type Target = [R::Borrowed<'arena>];

    fn deref(&self) -> &Self::Target {
        self.rows
    }
}