use std::alloc::{GlobalAlloc, Layout, System};
 
struct TrackingAllocator;
 
unsafe impl GlobalAlloc for TrackingAllocator {
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        println!("Allocating {} bytes", layout.size());
        System.alloc(layout)
    }
 
    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
        println!("Deallocating {} bytes", layout.size());
        System.dealloc(ptr, layout)
    }
}
 
#[global_allocator]
static GLOBAL: TrackingAllocator = TrackingAllocator;