2006-09-01 Thierry GERAUD <theo(a)tegucigalpa.lrde.epita.fr>
* xtd/optraits.hh
(xtd_op_eq_trait_, xtd_op_neq_trait_): New.
(xtd_op_less_trait_, xtd_op_leq_trait_): New.
(xtd_op_greater_trait_, xtd_op_geq_trait_): New.
* xtd/vec.hh: Replace assert by contract macros.
(operator<<): New.
(lexi_less_t, lexi_less): New.