#include <utility> 
#include <tuple> 
 
template<class Tuple> struct foo { Tuple t; foo(Tuple &&t) : t(std::move(t)) { } }; template<class... Args> using ForwardedTuple = decltype(std::forward_as_tuple(std::forward<Args>(std::declval<Args>())...)); template<class... Args> foo<ForwardedTuple<Args...>> make_foo(Args&&... args) { return {std::forward_as_tuple(std::forward<Args>(args)...)}; } template<class... Args> auto make_foo2(Args&& ...args) -> decltype(foo<decltype(std::forward_as_tuple(std::forward<Args>(args)...))>(std::forward_as_tuple(std::forward<Args>(args)...))) { return foo<decltype(std::forward_as_tuple(std::forward<Args>(args)...))>(std::forward_as_tuple(std::forward<Args>(args)...)); } 
 
int main() { make_foo(1 + 1); make_foo2(1 + 1); }

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