Libbson contains a lightweight memory abstraction to make portability to new platforms easier.

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                                    BSON_MEMORY(3)

       Libbson  contains  a  lightweight  memory  abstraction  to  make  portability  to  new  platforms easier.
       Additionally, it helps us integrate with interesting higher-level languages. One caveat, however, is that
       Libbson is not designed to deal with Out of Memory (OOM) situations. Doing so requires extreme  diligence
       throughout  the  application  stack  that  has  rarely been implemented correctly. This may change in the
       future. As it stands now, Libbson will abort() under OOM situations.

       To aid in language binding integration,  Libbson  allows  for  setting  a  custom  memory  allocator  via
       bson_mem_set_vtable().  This allocation may be reversed via bson_mem_restore_vtable().