1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -Winvalid-noreturn %s -verify
2
3 template<typename T>
test_attributes()4 void test_attributes() {
5 // FIXME: GCC accepts [[gnu::noreturn]] here.
6 auto nrl = []() [[gnu::noreturn]] {}; // expected-warning{{attribute 'noreturn' ignored}}
7 }
8
9 template void test_attributes<int>();
10
11 template<typename T>
call_with_zero()12 void call_with_zero() {
13 [](T *ptr) -> T& { return *ptr; }(0);
14 }
15
16 template void call_with_zero<int>();
17
18 template<typename T>
captures(T x,T y)19 T captures(T x, T y) {
20 auto lambda = [=, &y] () -> T {
21 T i = x;
22 return i + y;
23 };
24
25 return lambda();
26 }
27
28 struct X {
29 X(const X&);
30 };
31
32 X operator+(X, X);
33 X operator-(X, X);
34
35 template int captures(int, int);
36 template X captures(X, X);
37
38 template<typename T>
infer_result(T x,T y)39 int infer_result(T x, T y) {
40 auto lambda = [=](bool b) { return x + y; };
41 return lambda(true); // expected-error{{no viable conversion from returned value of type 'X' to function return type 'int'}}
42 }
43
44 template int infer_result(int, int);
45 template int infer_result(X, X); // expected-note{{in instantiation of function template specialization 'infer_result<X>' requested here}}
46
47 // Make sure that lambda's operator() can be used from templates.
48 template<typename F>
accept_lambda(F f)49 void accept_lambda(F f) {
50 f(1);
51 }
52
53 template<typename T>
pass_lambda(T x)54 void pass_lambda(T x) {
55 accept_lambda([&x](T y) { return x + y; });
56 }
57
58 template void pass_lambda(int);
59
60 namespace std {
61 class type_info;
62 }
63
64 namespace p2 {
65 struct P {
66 virtual ~P();
67 };
68
69 template<typename T>
70 struct Boom {
Boomp2::Boom71 Boom(const Boom&) {
72 T* x = 1; // 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>
odr_used(R & r,Boom<T> boom)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();
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>
odr_used2(R & r,Boom<T> boom)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>
double_capture(T & nc)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>
__anon7c77cd3a0a02null125 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>
__anon7c77cd3a0b02null132 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
call_defaults()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 { // expected-note{{in instantiation of default member initializer 'NonLocalLambdaInstantation::X2<int *>::x' requested here}}
__anon7c77cd3a0c02NonLocalLambdaInstantation::X2143 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{{implicit default constructor for 'NonLocalLambdaInstantation::X2<int *>' first required here}}
149 }
150