Method GetAllocator

cpp/src/arrow/memory_pool_benchmark.cc:35–39

#ifdef ARROW_JEMALLOC
struct Jemalloc {
  static Result<MemoryPool*> GetAllocator() {
    MemoryPool* pool;
    RETURN_NOT_OK(jemalloc_memory_pool(&pool));
    return pool;
  }
};
#endif