1// RUN: %clang_cc1 -fsyntax-only -Wno-unused-value -verify -std=c++11 %s
2
3enum E { e };
4
5constexpr int id(int n) { return n; }
6
7class C {
8
9  int f() {
10    int foo, bar;
11
12    []; // expected-error {{expected body of lambda expression}}
13    [+] {}; // expected-error {{expected variable name or 'this' in lambda capture list}}
14    [foo+] {}; // expected-error {{expected ',' or ']' in lambda capture list}}
15    [foo,&this] {}; // expected-error {{'this' cannot be captured by reference}}
16    [&this] {}; // expected-error {{'this' cannot be captured by reference}}
17    [&,] {}; // expected-error {{expected variable name or 'this' in lambda capture list}}
18    [=,] {}; // expected-error {{expected variable name or 'this' in lambda capture list}}
19    [] {};
20    [=] (int i) {};
21    [&] (int) mutable -> void {};
22    [foo,bar] () { return 3; };
23    [=,&foo] () {};
24    [&,foo] () {};
25    [this] () {};
26    [] () -> class C { return C(); };
27    [] () -> enum E { return e; };
28
29    [] -> int { return 0; }; // expected-error{{lambda requires '()' before return type}}
30    [] mutable -> int { return 0; }; // expected-error{{lambda requires '()' before 'mutable'}}
31    [](int) -> {}; // PR13652 expected-error {{expected a type}}
32    return 1;
33  }
34
35  void designator_or_lambda() {
36    typedef int T;
37    const int b = 0;
38    const int c = 1;
39    int d;
40    int a1[1] = {[b] (T()) {}}; // expected-error{{no viable conversion from '(lambda}}
41    int a2[1] = {[b] = 1 };
42    int a3[1] = {[b,c] = 1 }; // expected-error{{expected ']'}} expected-note {{to match}}
43    int a4[1] = {[&b] = 1 }; // expected-error{{integral constant expression must have integral or unscoped enumeration type, not 'const int *'}}
44    int a5[3] = { []{return 0;}() };
45    int a6[1] = {[this] = 1 }; // expected-error{{integral constant expression must have integral or unscoped enumeration type, not 'C *'}}
46    int a7[1] = {[d(0)] { return d; } ()}; // expected-warning{{extension}}
47    int a8[1] = {[d = 0] { return d; } ()}; // expected-warning{{extension}}
48    int a9[1] = {[d = 0] = 1}; // expected-error{{is not an integral constant expression}}
49    int a10[1] = {[id(0)] { return id; } ()}; // expected-warning{{extension}}
50    int a11[1] = {[id(0)] = 1};
51  }
52
53  void delete_lambda(int *p) {
54    delete [] p;
55    delete [] (int*) { new int }; // ok, compound-literal, not lambda
56    delete [] { return new int; } (); // expected-error{{expected expression}}
57    delete [&] { return new int; } (); // ok, lambda
58  }
59
60  // We support init-captures in C++11 as an extension.
61  int z;
62  void init_capture() {
63    [n(0)] () mutable -> int { return ++n; }; // expected-warning{{extension}}
64    [n{0}] { return; }; // expected-error {{<initializer_list>}} expected-warning{{extension}}
65    [n = 0] { return ++n; }; // expected-error {{captured by copy in a non-mutable}} expected-warning{{extension}}
66    [n = {0}] { return; }; // expected-error {{<initializer_list>}} expected-warning{{extension}}
67    [a([&b = z]{})](){}; // expected-warning 2{{extension}}
68
69    int x = 4;
70    auto y = [&r = x, x = x + 1]() -> int { // expected-warning 2{{extension}}
71      r += 2;
72      return x + 2;
73    } ();
74  }
75
76  void attributes() {
77    [] [[]] {}; // expected-error {{lambda requires '()' before attribute specifier}}
78    [] __attribute__((noreturn)) {}; // expected-error {{lambda requires '()' before attribute specifier}}
79    []() [[]]
80      mutable {}; // expected-error {{expected body of lambda expression}}
81
82    []() [[]] {};
83    []() [[]] -> void {};
84    []() mutable [[]] -> void {};
85    []() mutable noexcept [[]] -> void {};
86
87    // Testing GNU-style attributes on lambdas -- the attribute is specified
88    // before the mutable specifier instead of after (unlike C++11).
89    []() __attribute__((noreturn)) mutable { while(1); };
90    []() mutable
91      __attribute__((noreturn)) { while(1); }; // expected-error {{expected body of lambda expression}}
92  }
93};
94