1 // RUN: %clang_cc1 -std=c++1z -verify -Wno-unused %s 2 3 struct Noncopyable { 4 Noncopyable(); 5 Noncopyable(const Noncopyable &) = delete; // expected-note 1+{{deleted}} expected-note 1+ {{not viable}} 6 virtual ~Noncopyable(); 7 }; 8 struct Derived : Noncopyable {}; 9 struct NoncopyableAggr { // expected-note 3{{candidate}} 10 Noncopyable nc; 11 }; 12 struct Indestructible { 13 Indestructible(); 14 ~Indestructible() = delete; // expected-note 1+{{deleted}} 15 }; 16 struct Incomplete; // expected-note 1+{{declar}} 17 make(int kind=0)18Noncopyable make(int kind = 0) { 19 switch (kind) { 20 case 0: return {}; 21 case 1: return Noncopyable(); 22 case 2: return Noncopyable{}; 23 case 3: return make(); 24 } 25 __builtin_unreachable(); 26 } 27 28 Indestructible make_indestructible(); 29 Incomplete make_incomplete(); // expected-note 1+{{here}} 30 take(Noncopyable nc)31void take(Noncopyable nc) {} 32 nrvo()33Noncopyable nrvo() { 34 Noncopyable nrvo; 35 return nrvo; // expected-error {{deleted constructor}} 36 } 37 38 Noncopyable nc1 = make(); 39 Noncopyable nc2 = Noncopyable(); 40 Noncopyable nc3 = Derived(); // expected-error {{deleted constructor}} 41 Noncopyable nc4((Noncopyable())); 42 Noncopyable nc5 = {Noncopyable()}; 43 Noncopyable nc6{Noncopyable()}; 44 45 NoncopyableAggr nca1 = NoncopyableAggr{}; 46 NoncopyableAggr nca2 = NoncopyableAggr{{}}; 47 NoncopyableAggr nca3 = NoncopyableAggr{NoncopyableAggr{Noncopyable()}}; 48 49 template<typename T> struct Convert { operator T(); }; // expected-note 1+{{candidate}} 50 Noncopyable conv1 = Convert<Noncopyable>(); 51 Noncopyable conv2((Convert<Noncopyable>())); 52 Noncopyable conv3 = {Convert<Noncopyable>()}; 53 Noncopyable conv4{Convert<Noncopyable>()}; 54 55 Noncopyable ref_conv1 = Convert<Noncopyable&>(); // expected-error {{deleted constructor}} 56 Noncopyable ref_conv2((Convert<Noncopyable&>())); // expected-error {{deleted constructor}} 57 Noncopyable ref_conv3 = {Convert<Noncopyable&>()}; // expected-error {{deleted constructor}} 58 Noncopyable ref_conv4{Convert<Noncopyable&>()}; // expected-error {{deleted constructor}} 59 60 Noncopyable derived_conv1 = Convert<Derived>(); // expected-error {{deleted constructor}} 61 Noncopyable derived_conv2((Convert<Derived>())); // expected-error {{deleted constructor}} 62 Noncopyable derived_conv3 = {Convert<Derived>()}; // expected-error {{deleted constructor}} 63 Noncopyable derived_conv4{Convert<Derived>()}; // expected-error {{deleted constructor}} 64 65 NoncopyableAggr nc_aggr1 = Convert<NoncopyableAggr>(); 66 NoncopyableAggr nc_aggr2((Convert<NoncopyableAggr>())); 67 NoncopyableAggr nc_aggr3 = {Convert<NoncopyableAggr>()}; // expected-error {{no viable conversion}} 68 NoncopyableAggr nc_aggr4{Convert<NoncopyableAggr>()}; // expected-error {{no viable conversion}} 69 NoncopyableAggr nc_aggr5 = Convert<Noncopyable>(); // expected-error {{no viable}} 70 NoncopyableAggr nc_aggr6((Convert<Noncopyable>())); // expected-error {{no matching constructor}} 71 NoncopyableAggr nc_aggr7 = {Convert<Noncopyable>()}; 72 NoncopyableAggr nc_aggr8{Convert<Noncopyable>()}; 73 test_expressions(bool b)74void test_expressions(bool b) { 75 auto lambda = [a = make()] {}; 76 77 take({}); 78 take(Noncopyable()); 79 take(Noncopyable{}); 80 take(make()); 81 82 Noncopyable &&dc1 = dynamic_cast<Noncopyable&&>(Noncopyable()); 83 Noncopyable &&dc2 = dynamic_cast<Noncopyable&&>(nc1); 84 Noncopyable &&dc3 = dynamic_cast<Noncopyable&&>(Derived()); 85 86 Noncopyable sc1 = static_cast<Noncopyable>(Noncopyable()); 87 Noncopyable sc2 = static_cast<Noncopyable>(nc1); // expected-error {{deleted}} 88 Noncopyable sc3 = static_cast<Noncopyable&&>(Noncopyable()); // expected-error {{deleted}} 89 Noncopyable sc4 = static_cast<Noncopyable>(static_cast<Noncopyable&&>(Noncopyable())); // expected-error {{deleted}} 90 91 Noncopyable cc1 = (Noncopyable)Noncopyable(); 92 Noncopyable cc2 = (Noncopyable)Derived(); // expected-error {{deleted}} 93 94 Noncopyable fc1 = Noncopyable(Noncopyable()); 95 Noncopyable fc2 = Noncopyable(Derived()); // expected-error {{deleted}} 96 97 // We must check for a complete type for every materialized temporary. (Note 98 // that in the special case of the top level of a decltype, no temporary is 99 // materialized.) 100 make_incomplete(); // expected-error {{incomplete}} 101 make_incomplete().a; // expected-error {{incomplete}} 102 make_incomplete().*(int Incomplete::*)nullptr; // expected-error {{incomplete}} 103 dynamic_cast<Incomplete&&>(make_incomplete()); // expected-error {{incomplete}} 104 const_cast<Incomplete&&>(make_incomplete()); // expected-error {{incomplete}} 105 106 sizeof(Indestructible{}); // expected-error {{deleted}} 107 sizeof(make_indestructible()); // expected-error {{deleted}} 108 sizeof(make_incomplete()); // expected-error {{incomplete}} 109 typeid(Indestructible{}); // expected-error {{deleted}} expected-error {{you need to include <typeinfo>}} 110 typeid(make_indestructible()); // expected-error {{deleted}} \ 111 // expected-error {{need to include <typeinfo>}} 112 typeid(make_incomplete()); // expected-error {{incomplete}} \ 113 // expected-error {{need to include <typeinfo>}} 114 115 // FIXME: The first two cases here are now also valid in C++17 onwards. 116 using I = decltype(Indestructible()); // expected-error {{deleted}} 117 using I = decltype(Indestructible{}); // expected-error {{deleted}} 118 using I = decltype(make_indestructible()); 119 using J = decltype(make_incomplete()); 120 121 Noncopyable cond1 = b ? Noncopyable() : make(); 122 Noncopyable cond2 = b ? Noncopyable() : Derived(); // expected-error {{incompatible}} 123 Noncopyable cond3 = b ? Derived() : Noncopyable(); // expected-error {{incompatible}} 124 Noncopyable cond4 = b ? Noncopyable() : nc1; // expected-error {{deleted}} 125 Noncopyable cond5 = b ? nc1 : Noncopyable(); // expected-error {{deleted}} 126 // Could convert both to an xvalue of type Noncopyable here, but we're not 127 // permitted to consider that. 128 Noncopyable &&cond6 = b ? Noncopyable() : Derived(); // expected-error {{incompatible}} 129 Noncopyable &&cond7 = b ? Derived() : Noncopyable(); // expected-error {{incompatible}} 130 // Could convert both to a const lvalue of type Noncopyable here, but we're 131 // not permitted to consider that, either. 132 const Noncopyable cnc; 133 const Noncopyable &cond8 = b ? cnc : Derived(); // expected-error {{incompatible}} 134 const Noncopyable &cond9 = b ? Derived() : cnc; // expected-error {{incompatible}} 135 136 extern const volatile Noncopyable make_cv(); 137 Noncopyable cv_difference1 = make_cv(); 138 const volatile Noncopyable cv_difference2 = make(); 139 } 140 141 template<typename T> struct ConversionFunction { operator T(); }; 142 Noncopyable cf1 = ConversionFunction<Noncopyable>(); 143 Noncopyable cf2 = ConversionFunction<Noncopyable&&>(); // expected-error {{deleted}} 144 Noncopyable cf3 = ConversionFunction<const volatile Noncopyable>(); 145 const volatile Noncopyable cf4 = ConversionFunction<Noncopyable>(); 146 Noncopyable cf5 = ConversionFunction<Derived>(); // expected-error {{deleted}} 147 148 struct AsMember { 149 Noncopyable member; AsMemberAsMember150 AsMember() : member(make()) {} 151 }; 152 // FIXME: DR (no number yet): we still get a copy for base or delegating construction. 153 struct AsBase : Noncopyable { AsBaseAsBase154 AsBase() : Noncopyable(make()) {} // expected-error {{deleted}} 155 }; 156 struct AsDelegating final { 157 AsDelegating(const AsDelegating &) = delete; // expected-note {{deleted}} 158 static AsDelegating make(int); 159 160 // The base constructor version of this is problematic; the complete object 161 // version would be OK. Perhaps we could allow copy omission here for final 162 // classes? AsDelegatingAsDelegating163 AsDelegating(int n) : AsDelegating(make(n)) {} // expected-error {{deleted}} 164 }; 165 166 namespace CtorTemplateBeatsNonTemplateConversionFn { 167 struct Foo { template <typename Derived> Foo(const Derived &); }; 168 template <typename Derived> struct Base { operator Foo() const = delete; }; // expected-note {{deleted}} 169 struct Derived : Base<Derived> {}; 170 f(Derived d)171 Foo f(Derived d) { return d; } // expected-error {{invokes a deleted function}} g(Derived d)172 Foo g(Derived d) { return Foo(d); } // ok, calls constructor 173 } 174