Function alloc::heap::reallocate_inplace
[−]
[src]
pub unsafe fn reallocate_inplace(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> usize
Unstable (
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.
If the operation succeeds, it returns usable_size(size, align)
and if it
fails (or is a no-op) it returns usable_size(old_size, align)
.
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).