Function make_backing

nodedb-vector/src/segment_backing/plain.rs:116–132

(dim: usize, vecs: &[Vec<f32>])

    use crate::mmap_segment::MmapVectorSegment;

    fn make_backing(dim: usize, vecs: &[Vec<f32>]) -> PlainMmapBacking {
        let dir = tempdir().unwrap();
        let path = dir.path().join("test.ndvs");

        let refs: Vec<&[f32]> = vecs.iter().map(|v| v.as_slice()).collect();
        let surrogates: Vec<u64> = (0..vecs.len() as u64).collect();

        let seg =
            MmapVectorSegment::create_with_surrogates(&path, dim, &refs, &surrogates).unwrap();

        // Keep the tempdir alive by leaking it for the test duration.
        // The backing borrows from the mmap, which is already self-contained
        // (fd kept open by the segment); dir can be dropped.
        drop(dir);

        PlainMmapBacking::new(seg)
    }

    #[test]
    fn plain_backing_basic_roundtrip() {