| // PR c++/101165 - P2266R1 - Simpler implicit move |
| // { dg-do compile { target c++23 } } |
| // From [diff.cpp20.expr]. |
| |
| template<typename T, typename U> |
| struct same_type { static const bool value = false; }; |
| |
| template<typename T> |
| struct same_type<T, T> { static const bool value = true; }; |
| |
| // In C++23, returns int&&; previously returned int&. |
| decltype(auto) f(int&& x) { return (x); } |
| static_assert(same_type<decltype(f), int&& (int&&)>::value); |
| |
| // This used to work in C++20. |
| int& g(int&& x) { return x; } // { dg-error "cannot bind non-const lvalue reference" } |
| |
| template<typename T> |
| decltype(auto) h(T&& x) { return (x); } |
| static_assert(same_type<decltype(h(42)), int&&>::value); |
