1 // RUN: %clang_cc1 -std=c++0x -Wno-unused-value -fsyntax-only -verify -fblocks %s
2
3 namespace std { class type_info; };
4
5 namespace ExplicitCapture {
6 class C {
7 int Member;
8
9 static void Overload(int);
10 void Overload();
11 virtual C& Overload(float);
12
ImplicitThisCapture()13 void ImplicitThisCapture() {
14 [](){(void)Member;}; // expected-error {{'this' cannot be implicitly captured in this context}}
15 [&](){(void)Member;};
16
17 [this](){(void)Member;};
18 [this]{[this]{};};
19 []{[this]{};};// expected-error {{'this' cannot be implicitly captured in this context}}
20 []{Overload(3);};
21 []{Overload();}; // expected-error {{'this' cannot be implicitly captured in this context}}
22 []{(void)typeid(Overload());};
23 []{(void)typeid(Overload(.5f));};// expected-error {{'this' cannot be implicitly captured in this context}}
24 }
25 };
26
f()27 void f() {
28 [this] () {}; // expected-error {{'this' cannot be captured in this context}}
29 }
30 }
31
32 namespace ReturnDeduction {
test()33 void test() {
34 [](){ return 1; };
35 [](){ return 1; };
36 [](){ return ({return 1; 1;}); };
37 [](){ return ({return 'c'; 1;}); }; // expected-error {{must match previous return type}} \
38 // expected-warning{{omitted result type}}
39 []()->int{ return 'c'; return 1; };
40 [](){ return 'c'; return 1; }; // expected-error {{must match previous return type}}
41 []() { return; return (void)0; };
42 [](){ return 1; return 1; }; // expected-warning{{omitted result type}}
43 }
44 }
45
46 namespace ImplicitCapture {
test()47 void test() {
48 int a = 0; // expected-note 5 {{declared}}
49 []() { return a; }; // expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{begins here}}
50 [&]() { return a; };
51 [=]() { return a; };
52 [=]() { int* b = &a; }; // expected-error {{cannot initialize a variable of type 'int *' with an rvalue of type 'const int *'}}
53 [=]() { return [&]() { return a; }; };
54 []() { return [&]() { return a; }; }; // expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
55 []() { return ^{ return a; }; };// expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
56 []() { return [&a] { return a; }; }; // expected-error 2 {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note 2 {{lambda expression begins here}}
57 [=]() { return [&a] { return a; }; }; //
58
59 const int b = 2;
60 []() { return b; };
61
62 union { // expected-note {{declared}}
63 int c;
64 float d;
65 };
66 d = 3;
67 [=]() { return c; }; // expected-error {{unnamed variable cannot be implicitly captured in a lambda expression}}
68
69 __block int e; // expected-note 3 {{declared}}
70 [&]() { return e; }; // expected-error {{__block variable 'e' cannot be captured in a lambda expression}}
71 [&e]() { return e; }; // expected-error 2 {{__block variable 'e' cannot be captured in a lambda expression}}
72
73 int f[10]; // expected-note {{declared}}
74 [&]() { return f[2]; };
75 (void) ^{ return []() { return f[2]; }; }; // expected-error {{variable 'f' cannot be implicitly captured in a lambda with no capture-default specified}} \
76 // expected-note{{lambda expression begins here}}
77
78 struct G { G(); G(G&); int a; }; // expected-note 6 {{not viable}}
79 G g;
80 [=]() { const G* gg = &g; return gg->a; }; // expected-warning{{omitted result type}}
81 [=]() { return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error {{no matching constructor for initialization of 'ImplicitCapture::G'}} \
82 // expected-warning{{omitted result type}}
83 (void)^{ return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error 2 {{no matching constructor for initialization of 'const ImplicitCapture::G'}} \
84 // expected-warning{{omitted result type}}
85
86 const int h = a; // expected-note {{declared}}
87 []() { return h; }; // expected-error {{variable 'h' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
88
89 // The exemption for variables which can appear in constant expressions
90 // applies only to objects (and not to references).
91 // FIXME: This might be a bug in the standard.
92 static int i;
93 constexpr int &ref_i = i; // expected-note {{declared}}
94 [] { return ref_i; }; // expected-error {{variable 'ref_i' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
95 }
96 }
97
98 namespace PR12031 {
99 struct X {
100 template<typename T>
101 X(const T&);
102 ~X();
103 };
104
105 void f(int i, X x);
g()106 void g() {
107 const int v = 10;
108 f(v, [](){});
109 }
110 }
111
112 namespace NullPtr {
113 int &f(int *p);
114 char &f(...);
g()115 void g() {
116 int n = 0;
117 [=] {
118 char &k = f(n); // not a null pointer constant
119 } ();
120
121 const int m = 0;
122 [=] {
123 int &k = f(m); // a null pointer constant
124 } ();
125
126 [=] () -> bool {
127 int &k = f(m); // a null pointer constant
128 return &m == 0;
129 } ();
130
131 [m] {
132 int &k = f(m); // a null pointer constant
133 } ();
134 }
135 }
136
PR12248()137 void PR12248()
138 {
139 unsigned int result = 0;
140 auto l = [&]() { ++result; };
141 }
142
143 namespace ModifyingCapture {
test()144 void test() {
145 int n = 0;
146 [=] {
147 n = 1; // expected-error {{cannot assign to a variable captured by copy in a non-mutable lambda}}
148 };
149 }
150 }
151