is_assignable.pass.cpp (1702B)
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 #include "test_macros.h" 16 17 struct A 18 { 19 }; 20 21 struct B 22 { 23 void operator=(A); 24 }; 25 26 template <class T, class U> 27 void test_is_assignable() 28 { 29 static_assert(( std::is_assignable<T, U>::value), ""); 30 #if TEST_STD_VER > 14 31 static_assert( std::is_assignable_v<T, U>, ""); 32 #endif 33 } 34 35 template <class T, class U> 36 void test_is_not_assignable() 37 { 38 static_assert((!std::is_assignable<T, U>::value), ""); 39 #if TEST_STD_VER > 14 40 static_assert( !std::is_assignable_v<T, U>, ""); 41 #endif 42 } 43 44 struct D; 45 46 #if TEST_STD_VER >= 11 47 struct C 48 { 49 template <class U> 50 D operator,(U&&); 51 }; 52 53 struct E 54 { 55 C operator=(int); 56 }; 57 #endif 58 59 template <typename T> 60 struct X { T t; }; 61 62 int main() 63 { 64 test_is_assignable<int&, int&> (); 65 test_is_assignable<int&, int> (); 66 test_is_assignable<int&, double> (); 67 test_is_assignable<B, A> (); 68 test_is_assignable<void*&, void*> (); 69 70 #if TEST_STD_VER >= 11 71 test_is_assignable<E, int> (); 72 73 test_is_not_assignable<int, int&> (); 74 test_is_not_assignable<int, int> (); 75 #endif 76 test_is_not_assignable<A, B> (); 77 test_is_not_assignable<void, const void> (); 78 test_is_not_assignable<const void, const void> (); 79 test_is_not_assignable<int(), int> (); 80 81 // pointer to incomplete template type 82 test_is_assignable<X<D>*&, X<D>*> (); 83 }