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
7 unsigned int f(int);
8
9 struct X {};
10
11 template<typename T> T& lvalue();
12 template<typename T> T&& xvalue();
13 template<typename T> T prvalue();
14
test_classification(const int * ptr,X x)15 void 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
31 struct A {
32 volatile unsigned ubf : 4;
33 volatile unsigned uv;
34 volatile int sv;
35 void foo();
36 bool pred();
37 };
38
test(A & a)39 void 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