1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
2
defargs()3 void defargs() {
4 auto l1 = [](int i, int j = 17, int k = 18) { return i + j + k; };
5 int i1 = l1(1);
6 int i2 = l1(1, 2);
7 int i3 = l1(1, 2, 3);
8 }
9
10
defargs_errors()11 void defargs_errors() {
12 auto l1 = [](int i,
13 int j = 17,
14 int k) { }; // expected-error{{missing default argument on parameter 'k'}}
15
16 auto l2 = [](int i, int j = i) {}; // expected-error{{default argument references parameter 'i'}}
17
18 int foo;
19 auto l3 = [](int i = foo) {}; // expected-error{{default argument references local variable 'foo' of enclosing function}}
20 }
21
22 struct NonPOD {
23 NonPOD();
24 NonPOD(const NonPOD&);
25 ~NonPOD();
26 };
27
28 struct NoDefaultCtor {
29 NoDefaultCtor(const NoDefaultCtor&); // expected-note{{candidate constructor}} \
30 // expected-note{{candidate constructor not viable: requires 1 argument, but 0 were provided}}
31 ~NoDefaultCtor();
32 };
33
34 template<typename T>
defargs_in_template_unused(T t)35 void defargs_in_template_unused(T t) {
36 auto l1 = [](const T& value = T()) { }; // expected-error{{no matching constructor for initialization of 'NoDefaultCtor'}}
37 l1(t);
38 }
39
40 template void defargs_in_template_unused(NonPOD);
41 template void defargs_in_template_unused(NoDefaultCtor); // expected-note{{in instantiation of function template specialization 'defargs_in_template_unused<NoDefaultCtor>' requested here}}
42
43 template<typename T>
defargs_in_template_used()44 void defargs_in_template_used() {
45 auto l1 = [](const T& value = T()) { }; // expected-error{{no matching constructor for initialization of 'NoDefaultCtor'}} \
46 // expected-note{{candidate function not viable: requires single argument 'value', but no arguments were provided}} \
47 // expected-note{{conversion candidate of type 'void (*)(const NoDefaultCtor &)'}}
48 l1(); // expected-error{{no matching function for call to object of type '(lambda at }}
49 }
50
51 template void defargs_in_template_used<NonPOD>();
52 template void defargs_in_template_used<NoDefaultCtor>(); // expected-note{{in instantiation of function template specialization}}
53
54