derek.holloway
7502bf64a4
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46 lines
2.1 KiB
C++
46 lines
2.1 KiB
C++
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
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// The result of the expression const_cast<T>(v) is of type T. If T is
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// an lvalue reference to object type, the result is an lvalue; if T
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// is an rvalue reference to object type, the result is an xvalue;.
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unsigned int f(int);
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struct X {};
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template<typename T> T& lvalue();
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template<typename T> T&& xvalue();
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template<typename T> T prvalue();
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void test_classification(const int *ptr, X x) {
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int *&&ptr0 = const_cast<int *&&>(ptr);
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int *&&ptr1 = const_cast<int *&&>(xvalue<const int*>());
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int *&&ptr2 = const_cast<int *&&>(prvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&&'}}
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X &&ptr3 = const_cast<X&&>(x);
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X &&ptr4 = const_cast<X&&>(xvalue<X>());
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X &&ptr5 = const_cast<X&&>(prvalue<X>());
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int *&ptr6 = const_cast<int *&>(ptr);
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int *&ptr7 = const_cast<int *&>(xvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&'}}
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int *&ptr8 = const_cast<int *&>(prvalue<const int*>()); // expected-error {{const_cast from rvalue to reference type 'int *&'}}
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X &ptr9 = const_cast<X&>(x);
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X &ptrA = const_cast<X&>(xvalue<X>()); // expected-error {{const_cast from rvalue to reference type 'X &'}}
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X &ptrB = const_cast<X&>(prvalue<X>()); // expected-error {{const_cast from rvalue to reference type 'X &'}}
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}
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struct A {
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volatile unsigned ubf : 4;
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volatile unsigned uv;
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volatile int sv;
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void foo();
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bool pred();
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};
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void test(A &a) {
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unsigned &t0 = const_cast<unsigned&>(a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
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unsigned &t1 = const_cast<unsigned&>(a.foo(), a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
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unsigned &t2 = const_cast<unsigned&>(a.pred() ? a.ubf : a.ubf); // expected-error {{const_cast from bit-field lvalue to reference type}}
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unsigned &t3 = const_cast<unsigned&>(a.pred() ? a.ubf : a.uv); // expected-error {{const_cast from bit-field lvalue to reference type}}
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unsigned &t4 = const_cast<unsigned&>(a.pred() ? a.ubf : a.sv); // expected-error {{const_cast from rvalue to reference type}}
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}
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