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 // <functional> 11 12 // reference_wrapper 13 14 // Test that reference wrapper meets the requirements of TriviallyCopyable, 15 // CopyConstructible and CopyAssignable. 16 17 // Test fails due to use of is_trivially_* trait. 18 // XFAIL: gcc-4.9 19 20 #include <functional> 21 #include <type_traits> 22 #include <string> 23 24 #include "test_macros.h" 25 26 #if TEST_STD_VER >= 11 27 class MoveOnly 28 { 29 MoveOnly(const MoveOnly&); 30 MoveOnly& operator=(const MoveOnly&); 31 32 int data_; 33 public: 34 MoveOnly(int data = 1) : data_(data) {} 35 MoveOnly(MoveOnly&& x) 36 : data_(x.data_) {x.data_ = 0;} 37 MoveOnly& operator=(MoveOnly&& x) 38 {data_ = x.data_; x.data_ = 0; return *this;} 39 40 int get() const {return data_;} 41 }; 42 #endif 43 44 45 template <class T> 46 void test() 47 { 48 typedef std::reference_wrapper<T> Wrap; 49 static_assert(std::is_copy_constructible<Wrap>::value, ""); 50 static_assert(std::is_copy_assignable<Wrap>::value, ""); 51 // Extension up for standardization: See N4151. 52 static_assert(std::is_trivially_copyable<Wrap>::value, ""); 53 } 54 55 int main() 56 { 57 test<int>(); 58 test<double>(); 59 test<std::string>(); 60 #if TEST_STD_VER >= 11 61 test<MoveOnly>(); 62 #endif 63 } 64
