id summary reporter owner description type status milestone component version severity resolution keywords cc 7247 Expose empty_arg_list to public interface Andrey Semashev Daniel Wallin "The empty_arg_list is defined in the parameter::aux namespace which indicates that this class is not intended to be used by users. However, in generic code it is often useful to be able to pass empty parameter packs to functions when all arguments are optional. Please, make the empty_arg_list class public. " Feature Requests new To Be Determined parameter Boost 1.51.0 Problem