1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -fcxx-exceptions %s 2 3 void fn() = default; // expected-error {{only special member}} 4 struct foo { 5 void fn() = default; // expected-error {{only special member}} 6 7 foo() = default; 8 foo(const foo&) = default; 9 foo(foo&&) = default; 10 foo& operator = (const foo&) = default; 11 foo& operator = (foo&&) = default; 12 ~foo() = default; 13 }; 14 15 struct bar { 16 bar(); 17 bar(const bar&); 18 bar(bar&&); 19 bar& operator = (const bar&); 20 bar& operator = (bar&&); 21 ~bar(); 22 }; 23 24 bar::bar() = default; 25 bar::bar(const bar&) = default; 26 bar::bar(bar&&) = default; 27 bar& bar::operator = (const bar&) = default; 28 bar& bar::operator = (bar&&) = default; 29 bar::~bar() = default; 30 31 static_assert(__is_trivial(foo), "foo should be trivial"); 32 33 static_assert(!__has_trivial_destructor(bar), "bar's destructor isn't trivial"); 34 static_assert(!__has_trivial_constructor(bar), 35 "bar's default constructor isn't trivial"); 36 static_assert(!__has_trivial_copy(bar), "bar has no trivial copy"); 37 static_assert(!__has_trivial_assign(bar), "bar has no trivial assign"); 38 39 void tester() { 40 foo f, g(f); 41 bar b, c(b); 42 f = g; 43 b = c; 44 } 45 46 template<typename T> struct S : T { 47 constexpr S() = default; 48 constexpr S(const S&) = default; 49 constexpr S(S&&) = default; 50 }; 51 struct lit { constexpr lit() {} }; 52 S<lit> s_lit; // ok 53 S<bar> s_bar; // ok 54 55 struct Friends { 56 friend S<bar>::S(); 57 friend S<bar>::S(const S&); 58 friend S<bar>::S(S&&); 59 }; 60 61 namespace DefaultedFnExceptionSpec { 62 // DR1330: The exception-specification of an implicitly-declared special 63 // member function is evaluated as needed. 64 template<typename T> T &&declval(); 65 template<typename T> struct pair { 66 pair(const pair&) noexcept(noexcept(T(declval<T>()))); 67 }; 68 69 struct Y; 70 struct X { X(); X(const Y&); }; 71 struct Y { pair<X> p; }; 72 73 template<typename T> 74 struct A { 75 pair<T> p; 76 }; 77 struct B { 78 B(); 79 B(const A<B>&); 80 }; 81 82 // Don't crash here. 83 void f() { 84 X x = X(); 85 (void)noexcept(B(declval<B>())); 86 } 87 88 template<typename T> 89 struct Error { 90 // FIXME: Type canonicalization causes all the errors to point at the first 91 // declaration which has the type 'void () noexcept (T::error)'. We should 92 // get one error for 'Error<int>::Error()' and one for 'Error<int>::~Error()'. 93 void f() noexcept(T::error); // expected-error 2{{has no members}} 94 95 Error() noexcept(T::error); 96 Error(const Error&) noexcept(T::error); 97 Error(Error&&) noexcept(T::error); 98 Error &operator=(const Error&) noexcept(T::error); 99 Error &operator=(Error&&) noexcept(T::error); 100 ~Error() noexcept(T::error); 101 }; 102 103 struct DelayImplicit { 104 Error<int> e; 105 }; 106 107 // Don't instantiate the exception specification here. 108 void test1(decltype(declval<DelayImplicit>() = DelayImplicit(DelayImplicit()))); 109 void test2(decltype(declval<DelayImplicit>() = declval<const DelayImplicit>())); 110 void test3(decltype(DelayImplicit(declval<const DelayImplicit>()))); 111 112 // Any odr-use causes the exception specification to be evaluated. 113 struct OdrUse { // \ 114 expected-note {{instantiation of exception specification for 'Error'}} \ 115 expected-note {{instantiation of exception specification for '~Error'}} 116 Error<int> e; 117 }; 118 OdrUse use; // expected-note {{implicit default constructor for 'DefaultedFnExceptionSpec::OdrUse' first required here}} 119 } 120 121 namespace PR13527 { 122 struct X { 123 X() = delete; // expected-note {{here}} 124 X(const X&) = delete; // expected-note {{here}} 125 X(X&&) = delete; // expected-note {{here}} 126 X &operator=(const X&) = delete; // expected-note {{here}} 127 X &operator=(X&&) = delete; // expected-note {{here}} 128 ~X() = delete; // expected-note {{here}} 129 }; 130 X::X() = default; // expected-error {{redefinition}} 131 X::X(const X&) = default; // expected-error {{redefinition}} 132 X::X(X&&) = default; // expected-error {{redefinition}} 133 X &X::operator=(const X&) = default; // expected-error {{redefinition}} 134 X &X::operator=(X&&) = default; // expected-error {{redefinition}} 135 X::~X() = default; // expected-error {{redefinition}} 136 137 struct Y { 138 Y() = default; 139 Y(const Y&) = default; 140 Y(Y&&) = default; 141 Y &operator=(const Y&) = default; 142 Y &operator=(Y&&) = default; 143 ~Y() = default; 144 }; 145 Y::Y() = default; // expected-error {{definition of explicitly defaulted}} 146 Y::Y(const Y&) = default; // expected-error {{definition of explicitly defaulted}} 147 Y::Y(Y&&) = default; // expected-error {{definition of explicitly defaulted}} 148 Y &Y::operator=(const Y&) = default; // expected-error {{definition of explicitly defaulted}} 149 Y &Y::operator=(Y&&) = default; // expected-error {{definition of explicitly defaulted}} 150 Y::~Y() = default; // expected-error {{definition of explicitly defaulted}} 151 } 152 153 namespace PR27699 { 154 struct X { 155 X(); 156 }; 157 X::X() = default; // expected-note {{here}} 158 X::X() = default; // expected-error {{redefinition of 'X'}} 159 } 160 161 namespace PR14577 { 162 template<typename T> 163 struct Outer { 164 template<typename U> 165 struct Inner1 { 166 ~Inner1(); 167 }; 168 169 template<typename U> 170 struct Inner2 { 171 ~Inner2(); 172 }; 173 }; 174 175 template<typename T> 176 Outer<T>::Inner1<T>::~Inner1() = delete; // expected-error {{nested name specifier 'Outer<T>::Inner1<T>::' for declaration does not refer into a class, class template or class template partial specialization}} expected-error {{only functions can have deleted definitions}} 177 178 template<typename T> 179 Outer<T>::Inner2<T>::~Inner2() = default; // expected-error {{nested name specifier 'Outer<T>::Inner2<T>::' for declaration does not refer into a class, class template or class template partial specialization}} expected-error {{only special member functions may be defaulted}} 180 } 181 182 extern "C" { 183 template<typename _Tp> // expected-error {{templates must have C++ linkage}} 184 void PR13573(const _Tp&) = delete; 185 } 186 187 namespace PR15597 { 188 template<typename T> struct A { 189 A() noexcept(true) = default; 190 ~A() noexcept(true) = default; 191 }; 192 template<typename T> struct B { 193 B() noexcept(false) = default; // expected-error {{does not match the calculated one}} 194 ~B() noexcept(false) = default; // expected-error {{does not match the calculated one}} 195 }; 196 A<int> a; 197 B<int> b; // expected-note {{here}} 198 } 199 200 namespace PR27941 { 201 struct ExplicitBool { 202 ExplicitBool &operator=(bool) = default; // expected-error{{only special member functions may be defaulted}} 203 int member; 204 }; 205 206 int fn() { 207 ExplicitBool t; 208 t = true; 209 } 210 } 211
