p11-1y.cpp revision 87d948ecccffea9e9e37d0d053b246e2d6d6c47b 
1// RUN: %clang_cc1 -std=c++1y %s -verify
2
3const char *has_no_member = [x("hello")] {}.x; // expected-error {{no member named 'x'}}
4
5double f;
6auto with_float = [f(1.0f)] {
7  using T = decltype(f);
8  using T = float;
9};
10auto with_float_2 = [&f(f)] { // ok, refers to outer f
11  using T = decltype(f);
12  using T = double&;
13};
14
15// Within the lambda-expression's compound-statement,
16// the identifier in the init-capture hides any declaration
17// of the same name in scopes enclosing the lambda-expression.
18void hiding() {
19  char c;
20  (void) [c("foo")] {
21    static_assert(sizeof(c) == sizeof(const char*), "");
22  };
23  (void) [c("bar")] () -> decltype(c) { // outer c, not init-capture
24    return "baz"; // expected-error {{cannot initialize}}
25  };
26}
27
28struct ExplicitCopy {
29  ExplicitCopy(); // expected-note 2{{not viable}}
30  explicit ExplicitCopy(const ExplicitCopy&);
31};
32auto init_kind_1 = [ec(ExplicitCopy())] {};
33auto init_kind_2 = [ec = ExplicitCopy()] {}; // expected-error {{no matching constructor}}
34
35template<typename T> void init_kind_template() {
36  auto init_kind_1 = [ec(T())] {};
37  auto init_kind_2 = [ec = T()] {}; // expected-error {{no matching constructor}}
38}
39template void init_kind_template<int>();
40template void init_kind_template<ExplicitCopy>(); // expected-note {{instantiation of}}
41
42void void_fn();
43int overload_fn();
44int overload_fn(int);
45
46auto bad_init_1 = [a()] {}; // expected-error {{expected expression}}
47auto bad_init_2 = [a(1, 2)] {}; // expected-error {{initializer for lambda capture 'a' contains multiple expressions}}
48auto bad_init_3 = [&a(void_fn())] {}; // expected-error {{cannot form a reference to 'void'}}
49auto bad_init_4 = [a(void_fn())] {}; // expected-error {{has incomplete type 'void'}}
50auto bad_init_5 = [a(overload_fn)] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer of type '<overloaded function}}
51auto bad_init_6 = [a{overload_fn}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer list}}
52auto bad_init_7 = [a{{1}}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from nested initializer list}}
53
54template<typename...T> void pack_1(T...t) { (void)[a(t...)] {}; } // expected-error {{initializer missing for lambda capture 'a'}}
55template void pack_1<>(); // expected-note {{instantiation of}}
56
57// FIXME: Might need lifetime extension for the temporary here.
58// See DR1695.
59auto a = [a(4), b = 5, &c = static_cast<const int&&>(0)] {
60  static_assert(sizeof(a) == sizeof(int), "");
61  static_assert(sizeof(b) == sizeof(int), "");
62  using T = decltype(c);
63  using T = const int &;
64};
65auto b = [a{0}] {}; // OK, per N3922
66
67struct S { S(); S(S&&); };
68template<typename T> struct remove_reference { typedef T type; };
69template<typename T> struct remove_reference<T&> { typedef T type; };
70template<typename T> decltype(auto) move(T &&t) { return static_cast<typename remove_reference<T>::type&&>(t); }
71auto s = [s(move(S()))] {};
72
73template<typename T> T instantiate_test(T t) {
74  [x(&t)]() { *x = 1; } (); // expected-error {{assigning to 'const char *'}}
75  return t;
76}
77int instantiate_test_1 = instantiate_test(0);
78const char *instantiate_test_2 = instantiate_test("foo"); // expected-note {{here}}
79