bumpalo 3.4.0

A fast bump allocation arena for Rust.
Documentation 
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use bumpalo::Bump;
use std::alloc::Layout;

#[test]
fn alloc_slice_fill_zero() {
    let b = Bump::new();
    let layout = Layout::new::<u8>();

    let ptr1 = b.alloc_layout(layout);

    struct MyZeroSizedType;

    b.alloc_slice_copy::<u64>(&[]);
    b.alloc_slice_clone::<String>(&[]);
    b.alloc_slice_fill_with::<String, _>(0, |_| panic!("should not happen"));
    b.alloc_slice_fill_copy(0, 42u64);
    b.alloc_slice_fill_clone(0, &"hello".to_string());
    b.alloc_slice_fill_default::<String>(0);
    let ptr2 = b.alloc(MyZeroSizedType);
    assert_eq!(ptr1.as_ptr() as usize & !7, ptr2 as *mut _ as usize);

    let ptr3 = b.alloc_layout(layout);
    assert_eq!(ptr2 as *mut _ as usize, ptr3.as_ptr() as usize + 1);
}

#[test]
#[should_panic(expected = "out of memory")]
fn alloc_slice_overflow() {
    let b = Bump::new();

    b.alloc_slice_fill_default::<u64>(usize::max_value());
}