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
test(A & a,B & b)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 reference of type 'A' to value of type 'const 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 reference of type 'const A' to value of type 'const volatile A' drops 'volatile' qualifier}}
43 }
44