Struct Counting 

pub(crate) struct Counting;

The system allocator, counting what goes through it.

A reallocation is counted as one allocation of the new size, because that is what it costs: a growing Vec that doubles four times allocated four times. A free is not counted at all, since what this is measuring is pressure rather than residency.

Trait Implementations

impl GlobalAlloc for Counting

unsafe fn alloc(&self, layout: Layout) -> *mut u8

Allocates memory as described by the given layout.

unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout)

Deallocates the block of memory at the given ptr pointer with the given layout.

unsafe fn realloc( &self, ptr: *mut u8, layout: Layout, new_size: usize, ) -> *mut u8

Shrinks or grows a block of memory to the given new_size in bytes. The block is described by the given ptr pointer and layout.

unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8

Behaves like alloc, but also ensures that the contents are set to zero before being returned.