p5-0x.cpp revision 79363f5e612c17cd05e1fa888632ee7860ced1ab
1// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11 2 3struct DefaultedDefCtor1 {}; 4struct DefaultedDefCtor2 { DefaultedDefCtor2() = default; }; 5struct DeletedDefCtor { DeletedDefCtor() = delete; DeletedDefCtor(int); }; 6class PrivateDefCtor { PrivateDefCtor() = default; public: PrivateDefCtor(int); }; 7struct DeletedDtor { ~DeletedDtor() = delete; }; 8class PrivateDtor { ~PrivateDtor() = default; }; 9class Friend { 10 Friend() = default; ~Friend() = default; 11 friend struct NotDeleted6c; 12 friend struct NotDeleted7i; 13 friend struct NotDeleted7j; 14 friend struct NotDeleted7k; 15}; 16struct UserProvidedDefCtor { UserProvidedDefCtor() {} }; 17int n; 18 19 20// A defaulted default constructor for a class X is defined as deleted if: 21 22// - X is a union-like class that has a variant member with a non-trivial 23// default constructor, 24union Deleted1a { UserProvidedDefCtor u; }; // expected-note {{defined here}} 25Deleted1a d1a; // expected-error {{implicitly-deleted default constructor}} 26union NotDeleted1a { DefaultedDefCtor1 nu; }; 27NotDeleted1a nd1a; 28union NotDeleted1b { DefaultedDefCtor2 nu; }; 29NotDeleted1b nd1b; 30 31// - any non-static data member with no brace-or-equal-initializer is of 32// reference type, 33class Deleted2a { // expected-note {{defined here}} 34 Deleted2a() = default; // expected-note {{declared here}} 35 int &a; 36}; 37Deleted2a d2a; // expected-error {{implicitly-deleted default constructor}} 38struct Deleted2b { // expected-note {{here}} 39 int &&b; 40}; 41Deleted2b d2b; // expected-error {{deleted default constructor}} 42class NotDeleted2a { int &a = n; }; 43NotDeleted2a nd2a; 44class NotDeleted2b { int &a = error; }; // expected-error {{undeclared identifier}} 45NotDeleted2b nd2b; 46class NotDeleted2c { int &&a = 0; }; 47NotDeleted2c nd2c; 48 49// - any non-variant non-static data member of const qualified type (or array 50// thereof) with no brace-or-equal-initializer does not have a user-provided 51// default constructor, 52class Deleted3a { const int a; }; // expected-note {{here}} \ 53 expected-warning {{does not declare any constructor}} \ 54 expected-note {{will never be initialized}} 55Deleted3a d3a; // expected-error {{implicitly-deleted default constructor}} 56class Deleted3b { const DefaultedDefCtor1 a[42]; }; // expected-note {{here}} 57Deleted3b d3b; // expected-error {{implicitly-deleted default constructor}} 58class Deleted3c { const DefaultedDefCtor2 a; }; // expected-note {{defined here}} 59Deleted3c d3c; // expected-error {{implicitly-deleted default constructor}} 60class NotDeleted3a { const int a = 0; }; 61NotDeleted3a nd3a; 62class NotDeleted3b { const DefaultedDefCtor1 a[42] = {}; }; 63NotDeleted3b nd3b; 64class NotDeleted3c { const DefaultedDefCtor2 a = DefaultedDefCtor2(); }; 65NotDeleted3c nd3c; 66union NotDeleted3d { const int a; int b; }; 67NotDeleted3d nd3d; 68union NotDeleted3e { const DefaultedDefCtor1 a[42]; int b; }; 69NotDeleted3e nd3e; 70union NotDeleted3f { const DefaultedDefCtor2 a; int b; }; 71NotDeleted3f nd3f; 72struct NotDeleted3g { union { const int a; int b; }; }; 73NotDeleted3g nd3g; 74 75// - X is a union and all of its variant members are of const-qualified type (or 76// array thereof), 77union Deleted4a { const int a; const int b; const UserProvidedDefCtor c; }; // expected-note {{here}} 78Deleted4a d4a; // expected-error {{implicitly-deleted default constructor}} 79union NotDeleted4a { const int a; int b; }; 80NotDeleted4a nd4a; 81 82// - X is a non-union class and all members of any anonymous union member are of 83// const-qualified type (or array thereof), 84struct Deleted5a { union { const int a; }; union { int b; }; }; // expected-note {{here}} 85Deleted5a d5a; // expected-error {{implicitly-deleted default constructor}} 86struct NotDeleted5a { union { const int a; int b; }; union { const int c; int d; }; }; 87NotDeleted5a nd5a; 88 89// - any direct or virtual base class, or non-static data member with no 90// brace-or-equal-initializer, has class type M (or array thereof) and either 91// M has no default constructor or overload resolution as applied to M's default 92// constructor results in an ambiguity or in a function that is deleted or 93// inaccessible from the defaulted default constructor, or 94struct Deleted6a : Deleted2a {}; // expected-note {{here}} 95Deleted6a d6a; // expected-error {{implicitly-deleted default constructor}} 96struct Deleted6b : virtual Deleted2a {}; // expected-note {{here}} 97Deleted6b d6b; // expected-error {{implicitly-deleted default constructor}} 98struct Deleted6c { Deleted2a a; }; // expected-note {{here}} 99Deleted6c d6c; // expected-error {{implicitly-deleted default constructor}} 100struct Deleted6d { DeletedDefCtor a; }; // expected-note {{here}} 101Deleted6d d6d; // expected-error {{implicitly-deleted default constructor}} 102struct NotDeleted6a { DeletedDefCtor a = 0; }; 103NotDeleted6a nd6a; 104struct Deleted6e { PrivateDefCtor a; }; // expected-note {{here}} 105Deleted6e d6e; // expected-error {{implicitly-deleted default constructor}} 106struct NotDeleted6b { PrivateDefCtor a = 0; }; 107NotDeleted6b nd6b; 108struct NotDeleted6c { Friend a; }; 109NotDeleted6c nd6c; 110 111// - any direct or virtual base class or non-static data member has a type with 112// a destructor that is deleted or inaccessible from the defaulted default 113// constructor. 114struct Deleted7a : DeletedDtor {}; // expected-note {{here}} 115Deleted7a d7a; // expected-error {{implicitly-deleted default constructor}} 116struct Deleted7b : virtual DeletedDtor {}; // expected-note {{here}} 117Deleted7b d7b; // expected-error {{implicitly-deleted default constructor}} 118struct Deleted7c { DeletedDtor a; }; // expected-note {{here}} 119Deleted7c d7c; // expected-error {{implicitly-deleted default constructor}} 120struct Deleted7d { DeletedDtor a = {}; }; // expected-note {{here}} 121Deleted7d d7d; // expected-error {{implicitly-deleted default constructor}} 122struct Deleted7e : PrivateDtor {}; // expected-note {{here}} 123Deleted7e d7e; // expected-error {{implicitly-deleted default constructor}} 124struct Deleted7f : virtual PrivateDtor {}; // expected-note {{here}} 125Deleted7f d7f; // expected-error {{implicitly-deleted default constructor}} 126struct Deleted7g { PrivateDtor a; }; // expected-note {{here}} 127Deleted7g d7g; // expected-error {{implicitly-deleted default constructor}} 128struct Deleted7h { PrivateDtor a = {}; }; // expected-note {{here}} 129Deleted7h d7h; // expected-error {{implicitly-deleted default constructor}} 130struct NotDeleted7i : Friend {}; 131NotDeleted7i d7i; 132struct NotDeleted7j : virtual Friend {}; 133NotDeleted7j d7j; 134struct NotDeleted7k { Friend a; }; 135NotDeleted7k d7k; 136 137 138class Trivial { static const int n = 42; }; 139static_assert(__has_trivial_constructor(Trivial), "Trivial is nontrivial"); 140 141// A default constructor is trivial if it is not user-provided and if: 142class NonTrivialDefCtor1 { NonTrivialDefCtor1(); }; 143static_assert(!__has_trivial_constructor(NonTrivialDefCtor1), "NonTrivialDefCtor1 is trivial"); 144 145// - its class has no virtual functions (10.3) and no virtual base classes (10.1), and 146class NonTrivialDefCtor2 { virtual void f(); }; 147static_assert(!__has_trivial_constructor(NonTrivialDefCtor2), "NonTrivialDefCtor2 is trivial"); 148class NonTrivialDefCtor3 : virtual Trivial {}; 149static_assert(!__has_trivial_constructor(NonTrivialDefCtor3), "NonTrivialDefCtor3 is trivial"); 150 151// - no non-static data member of its class has a brace-or-equal-initializer, and 152class NonTrivialDefCtor4 { int m = 52; }; 153static_assert(!__has_trivial_constructor(NonTrivialDefCtor4), "NonTrivialDefCtor4 is trivial"); 154 155// - all the direct base classes of its class have trivial default constructors, and 156class NonTrivialDefCtor5 : NonTrivialDefCtor1 {}; 157static_assert(!__has_trivial_constructor(NonTrivialDefCtor5), "NonTrivialDefCtor5 is trivial"); 158 159// - for all the non-static data members of its class that are of class type (or array thereof), each such class 160// has a trivial default constructor. 161class NonTrivialDefCtor6 { NonTrivialDefCtor1 t; }; 162static_assert(!__has_trivial_constructor(NonTrivialDefCtor6), "NonTrivialDefCtor5 is trivial"); 163 164// Otherwise, the default constructor is non-trivial. 165class Trivial2 { Trivial2() = delete; }; 166static_assert(__has_trivial_constructor(Trivial2), "Trivial2 is trivial"); 167 168class Trivial3 { Trivial3() = default; }; 169static_assert(__has_trivial_constructor(Trivial3), "Trivial3 is trivial"); 170 171template<typename T> class Trivial4 { Trivial4() = default; }; 172static_assert(__has_trivial_constructor(Trivial4<int>), "Trivial4 is trivial"); 173 174template<typename T> class Trivial5 { Trivial5() = delete; }; 175static_assert(__has_trivial_constructor(Trivial5<int>), "Trivial5 is trivial"); 176