Function alloc::heap::reallocate
[−]
[src]
pub unsafe fn reallocate(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> *mut u8
heap_api #27700): the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector
Resize the allocation referenced by ptr to size bytes.
On failure, return a null pointer and leave the original allocation intact.
If the allocation was relocated, the memory at the passed-in pointer is undefined after the call.
Behavior is undefined if the requested size is 0 or the alignment is not a power of 2. The alignment must be no larger than the largest supported page size on the platform.
The old_size and align parameters are the parameters that were used to
create the allocation referenced by ptr. The old_size parameter may be
any value in range_inclusive(requested_size, usable_size).