default-arguments.cpp revision c6889e7ed16604c51994e1f11becf213fdc64eb3 
1// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -Wno-lambda-extensions -verify
2
3void 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
11void 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
22struct NonPOD {
23  NonPOD();
24  NonPOD(const NonPOD&);
25  ~NonPOD();
26};
27
28struct NoDefaultCtor {
29  NoDefaultCtor(const NoDefaultCtor&); // expected-note{{candidate constructor}}
30  ~NoDefaultCtor();
31};
32
33template<typename T>
34void defargs_in_template_unused(T t) {
35  auto l1 = [](const T& value = T()) { };
36  l1(t);
37}
38
39template void defargs_in_template_unused(NonPOD);
40template void defargs_in_template_unused(NoDefaultCtor);
41
42template<typename T>
43void defargs_in_template_used() {
44  auto l1 = [](const T& value = T()) { }; // expected-error{{no matching constructor for initialization of 'NoDefaultCtor'}}
45  l1(); // expected-note{{in instantiation of default function argument expression for 'operator()<NoDefaultCtor>' required here}}
46}
47
48template void defargs_in_template_used<NonPOD>();
49template void defargs_in_template_used<NoDefaultCtor>(); // expected-note{{in instantiation of function template specialization}}
50
51