template<typename T>
struct restinio::file_upload::impl::valid_handler_type< T, restinio::utils::metaprogramming::void_t< std::enable_if_t< std::is_same< handling_result_t, decltype(std::declval< T >()(std::declval< part_description_t >())) >::value, bool > > >
Definition at line 283 of file file_upload.hpp.