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# Memory Management

With the `CxAllocator` interface UCX provides the possibility to use custom allocator functions for different purposes.
Many UCX functions support the use of specialized allocators or provide a second function suffixed with `_a`.

For convenience, functions that are not explicitly requesting an allocator - like e.g. `cx_strdup_a()` - also accept
`NULL` as an allocator, in which case the [default allocator](allocator.h.md#default-allocator) is used.

Additionally, UCX also provides a [memory pool](mempool.h.md) implementation of the allocator interface.

> Although not part of the public API, UCX is also implementing the allocator interface
> in its own test suite: `CxTestingAllocator`. This allocator keeps track of memory allocations
> and deallocations with the goal to detect memory management errors.