MemVec
is a Vec-like interface for continuous memory buffer. Mostly intended to be used with mmap
.
```rust use memvec::{MemVec, VecFile};
struct Record { time: std::time::Instant, event_id: u32, _payload: [u8; 50], // we will not use it }
fn main() { let mut path = std::env::temp_dir(); path.push("vecfile.memvec");
let vec_file = VecFile::from_path(&path).expect("file open failed");
let mut vec =
unsafe { MemVec::<Record, _>::try_from_memory(vec_file) }.expect("vec file is corrupted");
if vec.len() == 0 {
// creating a new file
println!("creating a new file: {path:?}");
for i in 0..10 {
vec.push(Record {
time: std::time::Instant::now(),
event_id: '1' as u32 + (i % 3),
_payload: unsafe { std::mem::zeroed() },
})
}
} else {
// found an existing file
for (i, item) in vec.iter().enumerate() {
println!(
"idx: {i} time: {time:?} event_id: {event_id}",
time = item.time,
event_id = item.event_id
);
}
vec.clear();
println!("deleted existing file: {path:?}");
}
} ```