Method alloc

zeroize/tests/alloc.rs:12–14

(&self, layout: Layout)

unsafe impl GlobalAlloc for ProxyAllocator {
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        unsafe { System.alloc(layout) }
    }

    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
        if layout.size() == 160 {