150 class argument {  class
156     argument(argument const& other)  in argument()  function in utility::internal::argument
159     argument& operator=(argument a) {  in operator =()
163     void swap(argument& other) {  in swap()
168     argument(std::string a_name,  in argument()  function in utility::internal::argument
194     typedef std::map<std::string, internal::argument> args_map_type;
205     void add_arg(internal::argument const& a) {  in add_arg()
221         internal::argument a(name, description, dest, validate);  in arg()
236         internal::argument a(name, description, dest, validate);  in positional_arg()
249                 internal::argument* pa = nullptr;  in parse()
331             const internal::argument& a = (*argument_it).second;  in usage_string()