Availability:C-language interface function
+t, atom_t *a)If t is an atom, store the unique atom identifier over a.
See also PL_atom_chars()
If there is no need to access the data (characters) of an atom, it is
advised to manipulate atoms using their handle. As the atom is
referenced by t, it will live at least as long as t
does. If longer lifetime is required, the atom should be locked using PL_register_atom().