25     #define BASES private boost::contract::constructor_precondition<t<Id> >  macro
26     : BASES
28     typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
29     #undef BASES
86     #define BASES private boost::contract::constructor_precondition<c>, \  macro
88     : BASES
90     typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
91     #undef BASES
147     #define BASES private boost::contract::constructor_precondition<b>  macro
148     : BASES
150     typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
151     #undef BASES
162     #define BASES private boost::contract::constructor_precondition<a>, \  macro
164     : BASES
166     typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
167     #undef BASES