Function alloc

pub unsafe fn alloc(layout: Layout) -> *mut u8

Allocates 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);
}