Function alloc::heap::reallocate
[−]
[src]
pub unsafe fn reallocate(ptr: *mut u8,
old_size: usize,
size: usize,
align: usize)
-> *mut u8
🔬 This is a nightly-only experimental API. (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).