Method alloc

std/json/src/lib.rs:40–50

(&self, layout: Layout)

    unsafe impl GlobalAlloc for FreeListAlloc {
        unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
            if !INIT.load(Ordering::Relaxed) {
                unsafe { (*HEAP.0.get()).init(POOL.0.get() as *mut u8, POOL_SIZE); }
                INIT.store(true, Ordering::Relaxed);
            }
            unsafe {
                (*HEAP.0.get())
                    .allocate_first_fit(layout)
                    .map_or(core::ptr::null_mut(), |p| p.as_ptr())
            }
        }

        unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
            unsafe { (*HEAP.0.get()).deallocate(NonNull::new_unchecked(ptr), layout); }