id summary reporter owner description type status milestone component version severity resolution keywords cc 5698 Contains parameter er.ci.2020@… Daniel Wallin "I tested this {{{ template struct contains_parameter : mpl::not_< typename boost::is_void< typename parameter::binding< Args, Tag, void >::type >::type > {}; }}} which first appeared here: http://boost.2283326.n4.nabble.com/boost-users-Boost-Parameter-ArgumentPack-is-type-contained-td3415943.html and would like to suggest it as an addition." Feature Requests new To Be Determined parameter Boost 1.47.0 Not Applicable