| 1 | // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s |
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| 2 | |
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| 3 | |
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| 4 | // p3 |
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| 5 | // A glvalue of type "cv1 T1" can be cast to type "rvalue reference to |
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| 6 | // cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1" (8.5.3). |
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| 7 | // p4 |
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| 8 | // Otherwise, an expression e can be explicitly converted to a type T using a |
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| 9 | // static_cast of the form static_cast<T>(e) if the declaration T t(e); is |
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| 10 | // well-formed, for some invented temporary variable t (8.5). [...] |
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| 11 | struct A { }; |
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| 12 | struct B : A { }; |
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| 13 | |
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| 14 | struct C { explicit operator A&&(); }; |
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| 15 | struct D { operator B(); }; |
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| 16 | |
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| 17 | template<typename T> T& lvalue(); |
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| 18 | template<typename T> T&& xvalue(); |
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| 19 | template <typename T> T prvalue(); |
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| 20 | |
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| 21 | void test(A &a, B &b) { |
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| 22 | A &&ar0 = static_cast<A&&>(prvalue<A>()); |
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| 23 | A &&ar1 = static_cast<A&&>(prvalue<B>()); |
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| 24 | A &&ar2 = static_cast<A&&>(lvalue<C>()); |
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| 25 | A &&ar3 = static_cast<A&&>(xvalue<C>()); |
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| 26 | A &&ar4 = static_cast<A&&>(prvalue<C>()); |
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| 27 | A &&ar5 = static_cast<A&&>(lvalue<D>()); |
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| 28 | A &&ar6 = static_cast<A&&>(xvalue<D>()); |
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| 29 | A &&ar7 = static_cast<A&&>(prvalue<D>()); |
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| 30 | |
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| 31 | A &&ar8 = static_cast<A&&>(prvalue<const A>()); // expected-error {{binding value of type 'const A' to reference to type 'A' drops 'const' qualifier}} |
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| 32 | A &&ar9 = static_cast<A&&>(lvalue<const A>()); // expected-error {{cannot cast from lvalue of type 'const A'}} |
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| 33 | A &&ar10 = static_cast<A&&>(xvalue<const A>()); // expected-error {{cannot cast from rvalue of type 'const A'}} |
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| 34 | |
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| 35 | const A &&ar11 = static_cast<const A&&>(prvalue<A>()); |
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| 36 | const A &&ar12 = static_cast<const A&&>(prvalue<B>()); |
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| 37 | const A &&ar13 = static_cast<const A&&>(lvalue<C>()); |
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| 38 | const A &&ar14 = static_cast<const A&&>(xvalue<C>()); |
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| 39 | const A &&ar15 = static_cast<const A&&>(prvalue<C>()); |
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| 40 | const A &&ar16 = static_cast<const A&&>(lvalue<D>()); |
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| 41 | |
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| 42 | const A &&ar17 = static_cast<const A&&>(prvalue<A const volatile>()); // expected-error {{binding value of type 'const volatile A' to reference to type 'const A' drops 'volatile' qualifier}} |
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| 43 | } |
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| 44 | |
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