blocks.mm revision 612409ece080e814f79e06772c690d603f45fbd6 
1// RUN: %clang_cc1 -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
90namespace PR13117 {
91  struct A {
92    template<typename ... Args> static void f(Args...);
93
94    template<typename ... Args> static void f1()
95    {
96      (void)^(Args args) { // expected-error{{block contains unexpanded parameter pack 'Args'}}
97      };
98    }
99
100    template<typename ... Args> static void f2()
101    {
102      // FIXME: Allow this.
103      f(
104        ^(Args args) // expected-error{{block contains unexpanded parameter pack 'Args'}}
105        { }
106        ... // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
107      );
108    }
109
110    template<typename ... Args> static void f3()
111    {
112      (void)[](Args args) { // expected-error{{expression contains unexpanded parameter pack 'Args'}}
113      };
114    }
115
116    template<typename ... Args> static void f4()
117    {
118      f([](Args args) { } ...);
119    }
120  };
121
122  void g() {
123    A::f1<int, int>();
124    A::f2<int, int>();
125  }
126}
127