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 // type_traits 11 12 // is_assignable 13 14 #include <type_traits> 15 16 struct A 17 { 18 }; 19 20 struct B 21 { 22 void operator=(A); 23 }; 24 25 template <class T, class U> 26 void test_is_assignable() 27 { 28 static_assert(( std::is_assignable<T, U>::value), ""); 29 } 30 31 template <class T, class U> 32 void test_is_not_assignable() 33 { 34 static_assert((!std::is_assignable<T, U>::value), ""); 35 } 36 37 struct D; 38 39 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 40 struct C 41 { 42 template <class U> 43 D operator,(U&&); 44 }; 45 46 struct E 47 { 48 C operator=(int); 49 }; 50 #endif 51 52 template <typename T> 53 struct X { T t; }; 54 55 int main() 56 { 57 test_is_assignable<int&, int&> (); 58 test_is_assignable<int&, int> (); 59 test_is_assignable<int&, double> (); 60 test_is_assignable<B, A> (); 61 test_is_assignable<void*&, void*> (); 62 63 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 64 test_is_assignable<E, int> (); 65 66 test_is_not_assignable<int, int&> (); 67 test_is_not_assignable<int, int> (); 68 #endif 69 test_is_not_assignable<A, B> (); 70 test_is_not_assignable<void, const void> (); 71 test_is_not_assignable<const void, const void> (); 72 test_is_not_assignable<int(), int> (); 73 74 // pointer to incomplete template type 75 test_is_assignable<X<D>*&, X<D>*> (); 76 } 77
