sprite-core 0.1.7

Sprite Engine — a fault-tolerant actor runtime for Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

use bumpalo::Bump;

pub struct Arena {
    bump: Bump,
}

impl Arena {
    pub fn new() -> Self { Self { bump: Bump::new() } }
    pub fn with_capacity(capacity: usize) -> Self { Self { bump: Bump::with_capacity(capacity) } }
    /// Reset the arena in ~1-2ns. All allocations are invalidated.
    pub fn reset(&mut self) { self.bump.reset(); }
    pub fn alloc<T>(&self, val: T) -> &mut T { self.bump.alloc(val) }
    pub fn alloc_slice_copy<T: Copy>(&self, slice: &[T]) -> &mut [T] { self.bump.alloc_slice_copy(slice) }
    pub fn allocated_bytes(&self) -> usize { self.bump.allocated_bytes() }
}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn alloc_and_reset() {
        let mut arena = Arena::with_capacity(1024);
        let _ = arena.alloc(42i64);
        let before = arena.allocated_bytes();
        assert!(before > 0);
        arena.reset();
        let _ = arena.alloc(99i64);
        assert!(arena.allocated_bytes() >= before);
    }
}