| // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s |
| |
| // The result of the expression const_cast<T>(v) is of type T. If T is |
| // an lvalue reference to object type, the result is an lvalue; if T |
| // is an rvalue reference to object type, the result is an xvalue;. |
| |
| unsigned int f(int); |
| |
| struct X {}; |
| |
| template<typename T> T& lvalue(); |
| template<typename T> T&& xvalue(); |
| template<typename T> T prvalue(); |
| |
| void test_classification(const int *ptr, X x) { |
| int *&&ptr0 = const_cast<int *&&>(ptr); |
| int *&&ptr1 = const_cast<int *&&>(xvalue<const int*>()); |
| int *&&ptr2 = const_cast<int *&&>(prvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&&'}} |
| X &&ptr3 = const_cast<X&&>(x); |
| X &&ptr4 = const_cast<X&&>(xvalue<X>()); |
| X &&ptr5 = const_cast<X&&>(prvalue<X>()); |
| |
| int *&ptr6 = const_cast<int *&>(ptr); |
| int *&ptr7 = const_cast<int *&>(xvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&'}} |
| int *&ptr8 = const_cast<int *&>(prvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&'}} |
| X &ptr9 = const_cast<X&>(x); |
| X &ptrA = const_cast<X&>(xvalue<X>()); // expected-error {{const_cast from rvalue to reference type 'X &'}} |
| X &ptrB = const_cast<X&>(prvalue<X>()); // expected-error {{const_cast from rvalue to reference type 'X &'}} |
| } |
| |
| struct A { |
| volatile unsigned ubf : 4; |
| volatile unsigned uv; |
| volatile int sv; |
| void foo(); |
| bool pred(); |
| }; |
| |
| void test(A &a) { |
| unsigned &t0 = const_cast<unsigned&>(a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}} |
| unsigned &t1 = const_cast<unsigned&>(a.foo(), a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}} |
| unsigned &t2 = const_cast<unsigned&>(a.pred() ? a.ubf : a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}} |
| unsigned &t3 = const_cast<unsigned&>(a.pred() ? a.ubf : a.uv); // expected-error {{const_cast from bit-field lvalue to reference type}} |
| unsigned &t4 = const_cast<unsigned&>(a.pred() ? a.ubf : a.sv); // expected-error {{const_cast from rvalue to reference type}} |
| } |