1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s 2 3 4 // p3 5 // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to 6 // cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1" (8.5.3). 7 // p4 8 // Otherwise, an expression e can be explicitly converted to a type T using a 9 // static_cast of the form static_cast<T>(e) if the declaration T t(e); is 10 // well-formed, for some invented temporary variable t (8.5). [...] 11 struct A { }; 12 struct B : A { }; 13 14 struct C { explicit operator A&&(); }; 15 struct D { operator B(); }; 16 17 template<typename T> T& lvalue(); 18 template<typename T> T&& xvalue(); 19 template <typename T> T prvalue(); 20 21 void test(A &a, B &b) { 22 A &&ar0 = static_cast<A&&>(prvalue<A>()); 23 A &&ar1 = static_cast<A&&>(prvalue<B>()); 24 A &&ar2 = static_cast<A&&>(lvalue<C>()); 25 A &&ar3 = static_cast<A&&>(xvalue<C>()); 26 A &&ar4 = static_cast<A&&>(prvalue<C>()); 27 A &&ar5 = static_cast<A&&>(lvalue<D>()); 28 A &&ar6 = static_cast<A&&>(xvalue<D>()); 29 A &&ar7 = static_cast<A&&>(prvalue<D>()); 30 31 A &&ar8 = static_cast<A&&>(prvalue<const A>()); // expected-error {{binding value of type 'const A' to reference to type 'A' drops 'const' qualifier}} 32 A &&ar9 = static_cast<A&&>(lvalue<const A>()); // expected-error {{cannot cast from lvalue of type 'const A'}} 33 A &&ar10 = static_cast<A&&>(xvalue<const A>()); // expected-error {{cannot cast from rvalue of type 'const A'}} 34 35 const A &&ar11 = static_cast<const A&&>(prvalue<A>()); 36 const A &&ar12 = static_cast<const A&&>(prvalue<B>()); 37 const A &&ar13 = static_cast<const A&&>(lvalue<C>()); 38 const A &&ar14 = static_cast<const A&&>(xvalue<C>()); 39 const A &&ar15 = static_cast<const A&&>(prvalue<C>()); 40 const A &&ar16 = static_cast<const A&&>(lvalue<D>()); 41 42 const A &&ar17 = static_cast<const A&&>(prvalue<A const volatile>()); // expected-error {{binding value of type 'const volatile A' to reference to type 'const A' drops 'volatile' qualifier}} 43 } 44