Hi everybody, I'm trying the program_options library, I'd like to create my own options groups, but when i compile (using -lboost_program_options) option_groups.cpp from the example directory, i'm told that "implicit()" method from the typed_value class doesn't exist. Btw it doesn't appear in http://www.boost.org/doc/html/typed_value.html What is "implicit()" supposed to do, is it different from "default_value()" ? How can i solve this problem ? Here is the error message: option_groups.cpp: In function 'int main(int, char**)': option_groups.cpp:42: error: 'class boost::program_options::typed_value<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, char>' has no member named 'implicit' Regards -- Romuald THION Doctorant level 3.0 "la vie, c'est comme un jeu mal foutu dont on ne connait pas les règles et où il n'y a pas de sauvegardes"