Sets the allocator and params on config.
One of allocator and params can be null, but not both. When allocator is null
, the default allocator of the pool will use the values in param to perform its allocation. When param is
null, the pool will use the provided allocator with its default
AllocationParams.
A call to set_config can update the allocator and params with the
values that it is able to do. Some pools are, for example, not able to operate with different allocators or cannot allocate with the
values specified in params. Use get_config to get the currently
used values.
| config |
a BufferPool configuration |
| allocator | |
| params |