1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <utility> 11 12 // template <class T> 13 // typename conditional 14 // < 15 // !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value, 16 // const T&, 17 // T&& 18 // >::type 19 // move_if_noexcept(T& x); 20 21 #include <utility> 22 23 #include "test_macros.h" 24 25 class A 26 { 27 A(const A&); 28 A& operator=(const A&); 29 public: 30 31 A() {} 32 #if TEST_STD_VER >= 11 33 A(A&&) {} 34 #endif 35 }; 36 37 struct legacy 38 { 39 legacy() {} 40 legacy(const legacy&); 41 }; 42 43 int main() 44 { 45 int i = 0; 46 const int ci = 0; 47 48 legacy l; 49 A a; 50 const A ca; 51 52 #if TEST_STD_VER >= 11 53 static_assert((std::is_same<decltype(std::move_if_noexcept(i)), int&&>::value), ""); 54 static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&&>::value), ""); 55 static_assert((std::is_same<decltype(std::move_if_noexcept(a)), A&&>::value), ""); 56 static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&&>::value), ""); 57 static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), ""); 58 #else // C++ < 11 59 // In C++03 libc++ #define's decltype to be __decltype on clang and 60 // __typeof__ for other compilers. __typeof__ does not deduce the reference 61 // qualifiers and will cause this test to fail. 62 static_assert((std::is_same<decltype(std::move_if_noexcept(i)), const int&>::value), ""); 63 static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&>::value), ""); 64 static_assert((std::is_same<decltype(std::move_if_noexcept(a)), const A&>::value), ""); 65 static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&>::value), ""); 66 static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), ""); 67 #endif 68 69 #if TEST_STD_VER > 11 70 constexpr int i1 = 23; 71 constexpr int i2 = std::move_if_noexcept(i1); 72 static_assert(i2 == 23, "" ); 73 #endif 74 75 } 76
