[jira] [Created] (ARROW-1470) [C++] Add BufferAllocator abstract interface

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-1470:
-----------------------------------

             Summary: [C++] Add BufferAllocator abstract interface
                 Key: ARROW-1470
                 URL: https://issues.apache.org/jira/browse/ARROW-1470
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.7.0


There are some situations ({{arrow::ipc::SerializeRecordBatch}} where we pass a {{MemoryPool*}} solely to call {{AllocateBuffer}} using it. This is not as flexible as it could be, since there are situation where we may wish to allocate from shared memory instead. 

So instead:

{code}
Func(..., BufferAllocator* allocator, ...) {
  ...
  std::shared_ptr<Buffer> buffer;
  RETURN_NOT_OK(allocator->Allocate(nbytes, &buffer));
  ...
}
{code}



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