Hello community. I'm a GSoC student who is assigned to the checks library. I currently design the prototype of a function and I would like to have your opinions. Description. --------------- The function must return true or false if the number is correct (or not). This leads me to this prototype : template <typename mod10_iter> bool check_mod10 ( const mod10_iter &begin, const mod10_iter &end, unsigned int nbr_digits = 0) ; But each digits in the functions may have a weight. So I must passed a sequence of unsigned int to the function. template <typename mod10_iter> bool check_mod10 ( const mod10_iter &begin, const mod10_iter &end, const boost::array<unsigned int> &weight, unsigned int nbr_digits = 0) ; The parameter "weight" should be optional, if the size is equal to 0, the algorithm will consider a weight of 1 for all the digits. The const of weight is a problem if the size is equal to 0, we should make a copy of this argument. Do you have any ideas, suggestions about this prototype ? Thank you very much. Pierre Talbot.