Boost.Hana  1.4.0
Your standard library for metaprogramming
boost::hana::detail::first_unsatisfied_index< Pred > Struct Template Reference

Description

template<typename Pred>
struct boost::hana::detail::first_unsatisfied_index< Pred >

Returns the index of the first element which does not satisfy Pred, or sizeof...(Xs) if no such element exists.