When I found this bug, I thought I was lucky not to have wasted too much time understanding the strange messages of the compiler (damn macros!). Index: olena/ChangeLog from Roland Levillain <roland@lrde.epita.fr> * oln/core/abstract/image.hh (oln_fwd_iter_type_): Fix macro definition. Index: olena/oln/core/abstract/image.hh --- olena/oln/core/abstract/image.hh Tue, 13 Apr 2004 17:31:32 +0200 van-vl_n (oln/t/25_image.hh 1.32 600) +++ olena/oln/core/abstract/image.hh Thu, 24 Feb 2005 10:08:32 +0100 levill_r (oln/t/25_image.hh 1.32 600) @@ -356,7 +356,7 @@ # define oln_fwd_iter_type(Fwd_Iterable) \ mlc_exact_type(Fwd_Iterable)::fwd_iter_type # define oln_fwd_iter_type_(Fwd_Iterable) \ -mlc_exact_type_(Fwd_Iterable) +mlc_exact_type_(Fwd_Iterable)::fwd_iter_type # define oln_bkd_iter_type(Bkd_Iterable) \ mlc_exact_type(Bkd_Iterable)::bkd_iter_type