1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -Winvalid-noreturn %s -verify 2 3 template<typename T> 4 void test_attributes() { 5 auto nrl = []() [[noreturn]] {}; // expected-error{{lambda declared 'noreturn' should not return}} 6 } 7 8 template void test_attributes<int>(); // expected-note{{in instantiation of function}} 9 10 template<typename T> 11 void call_with_zero() { 12 [](T *ptr) -> T& { return *ptr; }(0); 13 } 14 15 template void call_with_zero<int>(); 16 17 template<typename T> 18 T captures(T x, T y) { 19 auto lambda = [=, &y] () -> T { 20 T i = x; 21 return i + y; 22 }; 23 24 return lambda(); 25 } 26 27 struct X { 28 X(const X&); 29 }; 30 31 X operator+(X, X); 32 X operator-(X, X); 33 34 template int captures(int, int); 35 template X captures(X, X); 36 37 template<typename T> 38 int infer_result(T x, T y) { 39 auto lambda = [=](bool b) { return x + y; }; 40 return lambda(true); // expected-error{{no viable conversion from 'X' to 'int'}} 41 } 42 43 template int infer_result(int, int); 44 template int infer_result(X, X); // expected-note{{in instantiation of function template specialization 'infer_result<X>' requested here}} 45 46 // Make sure that lambda's operator() can be used from templates. 47 template<typename F> 48 void accept_lambda(F f) { 49 f(1); 50 } 51 52 template<typename T> 53 void pass_lambda(T x) { 54 accept_lambda([&x](T y) { return x + y; }); 55 } 56 57 template void pass_lambda(int); 58 59 namespace std { 60 class type_info; 61 } 62 63 namespace p2 { 64 struct P { 65 virtual ~P(); 66 }; 67 68 template<typename T> 69 struct Boom { 70 Boom(const Boom&) { 71 T* x = 1; // expected-error{{cannot initialize a variable of type 'int *' with an rvalue of type 'int'}} \ 72 // expected-error{{cannot initialize a variable of type 'float *' with an rvalue of type 'int'}} 73 } 74 void tickle() const; 75 }; 76 77 template<typename R, typename T> 78 void odr_used(R &r, Boom<T> boom) { 79 const std::type_info &ti 80 = typeid([=,&r] () -> R& { // expected-error{{lambda expression in an unevaluated operand}} 81 boom.tickle(); // expected-note{{in instantiation of member function}} 82 return r; 83 }()); 84 } 85 86 template void odr_used(int&, Boom<int>); // expected-note{{in instantiation of function template specialization}} 87 88 template<typename R, typename T> 89 void odr_used2(R &r, Boom<T> boom) { 90 const std::type_info &ti 91 = typeid([=,&r] () -> R& { 92 boom.tickle(); // expected-note{{in instantiation of member function}} 93 return r; 94 }()); 95 } 96 97 template void odr_used2(P&, Boom<float>); 98 } 99 100 namespace p5 { 101 struct NonConstCopy { 102 NonConstCopy(const NonConstCopy&) = delete; 103 NonConstCopy(NonConstCopy&); 104 }; 105 106 template<typename T> 107 void double_capture(T &nc) { 108 [=] () mutable { 109 [=] () mutable { 110 T nc2(nc); 111 }(); 112 }(); 113 } 114 115 template void double_capture(NonConstCopy&); 116 } 117 118 namespace NonLocalLambdaInstantation { 119 template<typename T> 120 struct X { 121 static int value; 122 }; 123 124 template<typename T> 125 int X<T>::value = []{ return T(); }(); // expected-error{{cannot initialize a variable of type 'int' with an rvalue of type 'int *'}} 126 127 template int X<int>::value; 128 template int X<float>::value; 129 template int X<int*>::value; // expected-note{{in instantiation of static data member }} 130 131 template<typename T> 132 void defaults(int x = []{ return T(); }()) { }; // expected-error{{cannot initialize a parameter of type 'int' with an rvalue of type 'int *'}} \ 133 // expected-note{{passing argument to parameter 'x' here}} 134 135 void call_defaults() { 136 defaults<int>(); 137 defaults<float>(); 138 defaults<int*>(); // expected-note{{in instantiation of default function argument expression for 'defaults<int *>' required here}} 139 } 140 141 template<typename T> 142 struct X2 { 143 int x = []{ return T(); }(); // expected-error{{cannot initialize a member subobject of type 'int' with an rvalue of type 'int *'}} 144 }; 145 146 X2<int> x2i; 147 X2<float> x2f; 148 X2<int*> x2ip; // expected-note{{in instantiation of template class 'NonLocalLambdaInstantation::X2<int *>' requested here}} 149 } 150
