blocks.mm revision 6bcf27bb9a4b5c3f79cb44c0e4654a6d7619ad89 
1// RUN: %clang_cc1 -triple i686-pc-linux -std=c++11 -fblocks %s -verify
2
3void block_capture_errors() {
4  __block int var; // expected-note 2{{'var' declared here}}
5  (void)[var] { }; // expected-error{{__block variable 'var' cannot be captured in a lambda}}
6
7  (void)[=] { var = 17; }; // expected-error{{__block variable 'var' cannot be captured in a lambda}}
8}
9
10void conversion_to_block(int captured) {
11  int (^b1)(int) = [=](int x) { return x + captured; };
12
13  const auto lambda = [=](int x) { return x + captured; };
14  int (^b2)(int) = lambda;
15}
16
17template<typename T>
18class ConstCopyConstructorBoom {
19public:
20  ConstCopyConstructorBoom(ConstCopyConstructorBoom&);
21
22  ConstCopyConstructorBoom(const ConstCopyConstructorBoom&) {
23    T *ptr = 1; // expected-error{{cannot initialize a variable of type 'float *' with an rvalue of type 'int'}}
24  }
25
26  void foo() const;
27};
28
29void conversion_to_block_init(ConstCopyConstructorBoom<int> boom,
30                              ConstCopyConstructorBoom<float> boom2) {
31  const auto& lambda1([=] { boom.foo(); }); // okay
32
33  const auto& lambda2([=] { boom2.foo(); }); // expected-note{{in instantiation of member function}}
34  void (^block)(void) = lambda2;
35}
36
37
38void nesting() {
39  int array[7]; // expected-note 2{{'array' declared here}}
40  [=] () mutable {
41    [&] {
42      ^ {
43        int i = array[2];
44        i += array[3];
45      }();
46    }();
47  }();
48
49  [&] {
50    [=] () mutable {
51      ^ {
52        int i = array[2]; // expected-error{{cannot refer to declaration with an array type inside block}}
53        i += array[3]; // expected-error{{cannot refer to declaration with an array type inside block}}
54      }();
55    }();
56  }();
57}
58
59namespace overloading {
60  void bool_conversion() {
61    if ([](){}) {
62    }
63
64    bool b = []{};
65    b = (bool)[]{};
66  }
67
68  void conversions() {
69    int (*fp)(int) = [](int x) { return x + 1; };
70    fp = [](int x) { return x + 1; };
71
72    typedef int (*func_ptr)(int);
73    fp = (func_ptr)[](int x) { return x + 1; };
74
75    int (^bp)(int) = [](int x) { return x + 1; };
76    bp = [](int x) { return x + 1; };
77
78    typedef int (^block_ptr)(int);
79    bp = (block_ptr)[](int x) { return x + 1; };
80  }
81
82  int &accept_lambda_conv(int (*fp)(int));
83  float &accept_lambda_conv(int (^bp)(int));
84
85  void call_with_lambda() {
86    int &ir = accept_lambda_conv([](int x) { return x + 1; });
87  }
88
89  template<typename T> using id = T;
90
91  auto a = [](){};
92  struct C : decltype(a) {
93    using decltype(a)::operator id<void(*)()>;
94  private:
95    using decltype(a)::operator id<void(^)()>;
96  } extern c;
97
98  struct D : decltype(a) {
99    using decltype(a)::operator id<void(^)()>;
100  private:
101    using decltype(a)::operator id<void(*)()>; // expected-note {{here}}
102  } extern d;
103
104  bool r1 = c;
105  bool r2 = d; // expected-error {{private}}
106}
107
108namespace PR13117 {
109  struct A {
110    template<typename ... Args> static void f(Args...);
111
112    template<typename ... Args> static void f1()
113    {
114      (void)^(Args args) { // expected-error{{block contains unexpanded parameter pack 'Args'}}
115      };
116    }
117
118    template<typename ... Args> static void f2()
119    {
120      // FIXME: Allow this.
121      f(
122        ^(Args args) // expected-error{{block contains unexpanded parameter pack 'Args'}}
123        { }
124        ... // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
125      );
126    }
127
128    template<typename ... Args> static void f3()
129    {
130      (void)[](Args args) { // expected-error{{expression contains unexpanded parameter pack 'Args'}}
131      };
132    }
133
134    template<typename ... Args> static void f4()
135    {
136      f([](Args args) { } ...);
137    }
138  };
139
140  void g() {
141    A::f1<int, int>();
142    A::f2<int, int>();
143  }
144}
145