[Boost-users] gcc 4.0 and none_t

Hello, I have installed boost 1.33, compiled with gcc 4.0. In a program, I use none_t like that: third(subContextBlock.localCtxt) = val( boost::detail::none_t() ) and gcc reports this error: ../../src/parser/grammar/statement.cpp:143: error: 'none_t' is not a member of 'boost::detail' I don't understand at all... Does someone see any problem ? Also, I don't understand the '*' in the definition of none_t. Could someone explain this Thank you Vincent Torri