44 lines · cpp
1// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s2 3 4// p35// A glvalue of type "cv1 T1" can be cast to type "rvalue reference to6// cv2 T2" if "cv2 T2" is reference-compatible with "cv1 T1" (8.5.3).7// p48// Otherwise, an expression e can be explicitly converted to a type T using a9// static_cast of the form static_cast<T>(e) if the declaration T t(e); is10// well-formed, for some invented temporary variable t (8.5). [...]11struct A { };12struct B : A { };13 14struct C { explicit operator A&&(); };15struct D { operator B(); };16 17template<typename T> T& lvalue();18template<typename T> T&& xvalue();19template <typename T> T prvalue();20 21void test(A &a, B &b) {22 A &&ar0 = static_cast<A&&>(prvalue<A>());23 A &&ar1 = static_cast<A&&>(prvalue<B>());24 A &&ar2 = static_cast<A&&>(lvalue<C>());25 A &&ar3 = static_cast<A&&>(xvalue<C>());26 A &&ar4 = static_cast<A&&>(prvalue<C>());27 A &&ar5 = static_cast<A&&>(lvalue<D>());28 A &&ar6 = static_cast<A&&>(xvalue<D>());29 A &&ar7 = static_cast<A&&>(prvalue<D>());30 31 A &&ar8 = static_cast<A&&>(prvalue<const A>()); // expected-error {{binding reference of type 'A' to value of type 'const A' drops 'const' qualifier}}32 A &&ar9 = static_cast<A&&>(lvalue<const A>()); // expected-error {{cannot cast from lvalue of type 'const A'}}33 A &&ar10 = static_cast<A&&>(xvalue<const A>()); // expected-error {{cannot cast from rvalue of type 'const A'}}34 35 const A &&ar11 = static_cast<const A&&>(prvalue<A>());36 const A &&ar12 = static_cast<const A&&>(prvalue<B>());37 const A &&ar13 = static_cast<const A&&>(lvalue<C>());38 const A &&ar14 = static_cast<const A&&>(xvalue<C>());39 const A &&ar15 = static_cast<const A&&>(prvalue<C>());40 const A &&ar16 = static_cast<const A&&>(lvalue<D>());41 42 const A &&ar17 = static_cast<const A&&>(prvalue<A const volatile>()); // expected-error {{binding reference of type 'const A' to value of type 'const volatile A' drops 'volatile' qualifier}}43}44