On 9 May 2018 at 22:10, Tim wrote: > but I was expecting the last line of output to be "double const&&" because > the following overload of std::get: > > template< std::size_t I, class... Types > > constexpr std::tuple_element_t<I, tuple<Types...> >const&& > get( const tuple<Types...>&& t ) noexcept; > > What am I missing here? I'm using gcc 7.3.0 and the above code is compiled > using "-std=c++17" The overload you show above was only added to the standard quite recently, and is not implemented in GCC 7.3 (nobody ever claimed that C++17 support is complete in GCC 7.3). It was added by https://cplusplus.github.io/LWG/issue2485 If you use GCC 8.1 you get the result you expect.
