pub unsafe fn alloc(layout: Layout) -> *mut u8
Expand description
Allocate memory with the global allocator.
This function forwards calls to the GlobalAlloc::alloc
method
of the allocator registered with the #[global_allocator]
attribute
if there is one, or the std
crate’s default.
This function is expected to be deprecated in favor of the alloc
method
of the Global
type when it and the Allocator
trait become stable.
§Safety
See GlobalAlloc::alloc
.
§Examples
use std::alloc::{alloc, dealloc, handle_alloc_error, Layout};
unsafe {
let layout = Layout::new::<u16>();
let ptr = alloc(layout);
if ptr.is_null() {
handle_alloc_error(layout);
}
*(ptr as *mut u16) = 42;
assert_eq!(*(ptr as *mut u16), 42);
dealloc(ptr, layout);
}
Run