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SV *buildA(A& a)
{
...
  addBs(a_sv, b_svs);
  return a_sv;
}

void
addBs(SV *a_sv, std::vector<SV*> &b_svs)
...
  FREETMPS;
  LEAVE;
}

void get_a( )
    PPCODE:
       A a = getAFromSomewhere( );
       SV *a_sv = buildA(a);
       XPUSHs(sv_2mortal(a_sv));