p1-0x.cpp revision 41cb3d90c2114a7df7aa04f80c8be4b62994fb0d 
1// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2
3// The result of the expression const_cast<T>(v) is of type T. If T is
4// an lvalue reference to object type, the result is an lvalue; if T
5// is an rvalue reference to object type, the result is an xvalue;.
6
7unsigned int f(int);
8
9struct X {};
10
11template<typename T> T& lvalue();
12template<typename T> T&& xvalue();
13template<typename T> T prvalue();
14
15void test_classification(const int *ptr, X x) {
16  int *&&ptr0 = const_cast<int *&&>(ptr);
17  int *&&ptr1 = const_cast<int *&&>(xvalue<const int*>());
18  int *&&ptr2 = const_cast<int *&&>(prvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&&'}}
19  X &&ptr3 = const_cast<X&&>(x);
20  X &&ptr4 = const_cast<X&&>(xvalue<X>());
21  X &&ptr5 = const_cast<X&&>(prvalue<X>());
22
23  int *&ptr6 = const_cast<int *&>(ptr);
24  int *&ptr7 = const_cast<int *&>(xvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&'}}
25  int *&ptr8 = const_cast<int *&>(prvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&'}}
26  X &ptr9 = const_cast<X&>(x);
27  X &ptrA = const_cast<X&>(xvalue<X>()); // expected-error {{const_cast from rvalue to reference type 'X &'}}
28  X &ptrB = const_cast<X&>(prvalue<X>()); // expected-error {{const_cast from rvalue to reference type 'X &'}}
29}
30
31struct A {
32  volatile unsigned ubf : 4;
33  volatile unsigned uv;
34  volatile int sv;
35  void foo();
36  bool pred();
37};
38
39void test(A &a) {
40  unsigned &t0 = const_cast<unsigned&>(a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
41  unsigned &t1 = const_cast<unsigned&>(a.foo(), a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
42  unsigned &t2 = const_cast<unsigned&>(a.pred() ? a.ubf : a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
43  unsigned &t3 = const_cast<unsigned&>(a.pred() ? a.ubf : a.uv); // expected-error {{const_cast from bit-field lvalue to reference type}}
44  unsigned &t4 = const_cast<unsigned&>(a.pred() ? a.ubf : a.sv); // expected-error {{const_cast from rvalue to reference type}}
45}
46